JsonReader.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / ndp / fx / src / DataWeb / Server / System / Data / Services / Serializers / JsonReader.cs / 3 / JsonReader.cs

                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//  
//      Provides a reader implementaion for Json format
//  
// 
// @owner  [....]
//--------------------------------------------------------------------- 

namespace System.Data.Services.Serializers
{
    using System; 
    using System.Collections;
    using System.Diagnostics; 
    using System.Globalization; 
    using System.IO;
    using System.Text; 
    using System.Text.RegularExpressions;

    /// Json text reader.
    internal sealed class JsonReader : IDisposable 
    {
        /// Compiled Regex for DateTime Format. 
        private static readonly Regex DateTimeFormat = new Regex(@"^/Date\((?-?[0-9]+)\)/", RegexOptions.Compiled); 

        /// Maximum recursion limit on reader. 
        private const int RecursionLimit = 200;

        ///  Reader to reader text into 
        private readonly TextReader reader; 

        /// Depth of recursion. 
        private int recursionDepth; 

        ///  
        /// Creates a new instance of Json reader which readers the json text
        /// from the given reader
        /// 
        /// text reader from which json payload needs to be readS 
        public JsonReader(TextReader reader)
        { 
            Debug.Assert(reader != null, "reader != null"); 
            this.reader = reader;
        } 

        /// Releases resources held onto by this object.
        public void Dispose()
        { 
            this.reader.Dispose();
        } 
 
        /// 
        /// Converts the given value into the right type 
        /// 
        /// returns the clr object instance which 
        public object ReadValue()
        { 
            this.RecurseEnter();
 
            object value = null; 
            bool allowNull = false;
 
            char ch = this.PeekNextSignificantCharacter();
            if (ch == '[')
            {
                value = this.ReadArray(); 
            }
            else if (ch == '{') 
            { 
                value = this.ReadObject();
            } 
            else if ((ch == '\'') || (ch == '"'))
            {
                bool hasLeadingSlash;
                string s = this.ReadString(out hasLeadingSlash); 
                value = s; // may be overwritten with a DateTime if ends up being a date/time
 
                // Atlas format for date/time 
                if (hasLeadingSlash)
                { 
                    Match match = DateTimeFormat.Match(s);
                    if (match.Success)
                    {
                        string ticksStr = match.Groups["ticks"].Value; 

                        long ticks; 
                        if (long.TryParse(ticksStr, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out ticks)) 
                        {
                            // The javascript ticks start from 1/1/1970 but FX DateTime ticks start from 1/1/0001 
                            DateTime dateTime = new DateTime(ticks * 10000 + JsonWriter.DatetimeMinTimeTicks, DateTimeKind.Utc);
                            value = dateTime;
                        }
                    } 
                }
            } 
            else if (Char.IsDigit(ch) || (ch == '-') || (ch == '.')) 
            {
                value = this.ReadNumber(); 
            }
            else if ((ch == 't') || (ch == 'f'))
            {
                value = this.ReadBoolean(); 
            }
            else if (ch == 'n') 
            { 
                this.ReadNull();
                allowNull = true; 
            }

            if ((value == null) && (allowNull == false))
            { 
                throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent);
            } 
 
            this.RecurseLeave();
            return value; 
        }

        /// 
        /// Gets the next significant character from the reader. This function moves the enumerator by 1 position 
        /// 
        /// the next significant charater from the current reader position 
        private char GetNextSignificantCharacter() 
        {
            char ch = (char)this.reader.Read(); 
            return ch;
        }

        ///  
        /// Returns the next count characters from the reader's current position
        ///  
        /// number of characters to return 
        /// string consisting of next count characters
        private string GetCharacters(int count) 
        {
            StringBuilder stringBuilder = new StringBuilder();
            for (int i = 0; i < count; i++)
            { 
                char ch = (char)this.reader.Read();
                if (ch == '\0') 
                { 
                    return null;
                } 

                stringBuilder.Append(ch);
            }
 
            return stringBuilder.ToString();
        } 
 
        /// 
        /// Sets the readers position to the next significant character position 
        /// 
        /// returns the next significant character without changing the current position of the reader
        private char PeekNextSignificantCharacter()
        { 
            char ch = (char)this.reader.Peek();
            while ((ch != '\0') && Char.IsWhiteSpace(ch)) 
            { 
                this.reader.Read();
                ch = (char)this.reader.Peek(); 
            }

            return ch;
        } 

        ///  
        /// Converts the given text into an arrayList 
        /// 
        /// returns the arraylist containing the list of objects 
        private ArrayList ReadArray()
        {
            ArrayList array = new ArrayList();
 
            // Consume the '['
            this.reader.Read(); 
 
            while (true)
            { 
                char ch = this.PeekNextSignificantCharacter();
                if (ch == '\0')
                {
                    throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent); 
                }
 
                if (ch == ']') 
                {
                    this.reader.Read(); 
                    return array;
                }

                if (array.Count != 0) 
                {
                    if (ch != ',') 
                    { 
                        throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_MissingArrayMemberSeperator);
                    } 
                    else
                    {
                        this.reader.Read();
                    } 
                }
 
                object item = this.ReadValue(); 
                array.Add(item);
            } 
        }

        /// 
        /// Reads the boolean value 
        /// 
        /// returns the boolean value as read from the reader 
        private bool ReadBoolean() 
        {
            string s = this.ReadName(/* allowQuotes */ false); 

            if (s != null)
            {
                if (s.Equals(XmlConstants.XmlTrueLiteral, StringComparison.Ordinal)) 
                {
                    return true; 
                } 
                else if (s.Equals(XmlConstants.XmlFalseLiteral, StringComparison.Ordinal))
                { 
                    return false;
                }
            }
 
            throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidKeyword(s));
        } 
 
        /// 
        /// Reads the name string from the reader 
        /// 
        /// true, if you want to allow quotes, otherwise false
        /// string name value
        private string ReadName(bool allowQuotes) 
        {
            char ch = this.PeekNextSignificantCharacter(); 
 
            if ((ch == '"') || (ch == '\''))
            { 
                if (allowQuotes)
                {
                    return this.ReadString();
                } 
            }
            else 
            { 
                StringBuilder sb = new StringBuilder();
 
                while (true)
                {
                    ch = (char)this.reader.Peek();
                    if ((ch == '_') || Char.IsLetterOrDigit(ch) || ch == '$') 
                    {
                        this.reader.Read(); 
                        sb.Append(ch); 
                    }
                    else 
                    {
                        return sb.ToString();
                    }
                } 
            }
 
            return null; 
        }
 
        /// 
        /// Reads the null literal from the reader
        /// 
        private void ReadNull() 
        {
            string s = this.ReadName(/* allowQuotes */ false); 
 
            if (s == null)
            { 
                throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_MissingMemberName);
            }
            else if (!s.Equals("null", StringComparison.Ordinal))
            { 
                throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidKeyword(s));
            } 
        } 

        /// Reads the number from the reader. 
        /// reads the clr number object
        private object ReadNumber()
        {
            char ch = (char)this.reader.Read(); 

            StringBuilder sb = new StringBuilder(); 
 
            sb.Append(ch);
            while (true) 
            {
                ch = this.PeekNextSignificantCharacter();

                if (Char.IsDigit(ch) || (ch == '.') || (ch == 'E') || (ch == 'e') || (ch == '-') || (ch == '+')) 
                {
                    this.reader.Read(); 
                    sb.Append(ch); 
                }
                else 
                {
                    break;
                }
            } 

            string s = sb.ToString(); 
            Double doubleValue; 
            int intValue;
 
            // We will first try and convert this int32. If this succeeds, great. Otherwise, we will try
            // and convert this into a double.
            if (Int32.TryParse(s, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out intValue))
            { 
                return intValue;
            } 
            else if (Double.TryParse(s, NumberStyles.Float, NumberFormatInfo.InvariantInfo, out doubleValue)) 
            {
                return doubleValue; 
            }

            throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent);
        } 

        ///  
        /// Reads the object from the reader 
        /// 
        /// returns hashtable containing the list of property names and values 
        private Hashtable ReadObject()
        {
            Hashtable record = new Hashtable();
 
            // Consume the '{'
            this.reader.Read(); 
 
            while (true)
            { 
                char ch = this.PeekNextSignificantCharacter();
                if (ch == '\0')
                {
                    // Unterminated Object literal 
                    throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent);
                } 
 
                if (ch == '}')
                { 
                    this.reader.Read();
                    return record;
                }
 
                if (record.Count != 0)
                { 
                    if (ch != ',') 
                    {
                        throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_MissingMemberSeperator); 
                    }
                    else
                    {
                        this.reader.Read(); 
                    }
                } 
 
                string name = this.ReadName(/* allowQuotes */ true);
                if (String.IsNullOrEmpty(name)) 
                {
                    throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidJsonNameSpecifiedOrExtraComma);
                }
 
                ch = this.PeekNextSignificantCharacter();
 
                // Unexpected name/value pair syntax in object literal 
                if (ch != ':')
                { 
                    throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_MissingNameValueSeperator(name));
                }
                else
                { 
                    this.reader.Read();
                } 
 
                object item = this.ReadValue();
                record[name] = item; 
            }
        }

        ///  
        /// Read the string value from the reader
        ///  
        /// returns the string value read from the reader 
        private string ReadString()
        { 
            bool dummy;
            return this.ReadString(out dummy);
        }
 
        /// 
        /// Read the string value from the reader 
        ///  
        /// out parameter indicating whether the string has a leading slash or not
        /// returns the string value read from the reader 
        private string ReadString(out bool hasLeadingSlash)
        {
            StringBuilder sb = new StringBuilder();
 
            char endQuoteCharacter = (char)this.reader.Read();
            bool insideEscape = false; 
            bool firstCharacter = true; 
            hasLeadingSlash = false;
 
            while (true)
            {
                char ch = this.GetNextSignificantCharacter();
 
                // Unterminated string literal
                if (ch == '\0') 
                { 
                    throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent);
                } 

                if (firstCharacter)
                {
                    if (ch == '\\') 
                    {
                        hasLeadingSlash = true; 
                    } 

                    firstCharacter = false; 
                }

                if (insideEscape)
                { 
                    if (ch == 'u')
                    { 
                        string unicodeSequence = this.GetCharacters(4); 

                        // Unterminated string literal 
                        if (unicodeSequence == null)
                        {
                            throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent);
                        } 

                        ch = (char)Int32.Parse(unicodeSequence, NumberStyles.HexNumber, CultureInfo.InvariantCulture); 
                    } 

                    // From 4627, section 2.5, here's the list of characters that we should be escaping 
                    if (ch == 'b')
                    {
                        sb.Append('\b');
                    } 
                    else if (ch == 'f')
                    { 
                        sb.Append('\f'); 
                    }
                    else if (ch == 'n') 
                    {
                        sb.Append('\n');
                    }
                    else if (ch == 'r') 
                    {
                        sb.Append('\r'); 
                    } 
                    else if (ch == 't')
                    { 
                        sb.Append('\t');
                    }
                    else
                    { 
                        sb.Append(ch);
                    } 
 
                    insideEscape = false;
                    continue; 
                }

                if (ch == '\\')
                { 
                    insideEscape = true;
                    continue; 
                } 

                if (ch == endQuoteCharacter) 
                {
                    return sb.ToString();
                }
 
                sb.Append(ch);
            } 
        } 

        /// Marks the fact that a recursive method was entered, and checks that the depth is allowed. 
        private void RecurseEnter()
        {
            this.recursionDepth++;
            Debug.Assert(this.recursionDepth <= RecursionLimit, "this.recursionDepth <= RecursionLimit"); 
            if (this.recursionDepth == RecursionLimit)
            { 
                // 400 - Bad Request 
                throw DataServiceException.CreateDeepRecursion(RecursionLimit);
            } 
        }

        /// Marks the fact that a recursive method is leaving..
        private void RecurseLeave() 
        {
            this.recursionDepth--; 
            Debug.Assert(0 <= this.recursionDepth, "0 <= this.recursionDepth"); 
            Debug.Assert(this.recursionDepth < RecursionLimit, "this.recursionDepth < RecursionLimit");
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//  
//      Provides a reader implementaion for Json format
//  
// 
// @owner  [....]
//--------------------------------------------------------------------- 

namespace System.Data.Services.Serializers
{
    using System; 
    using System.Collections;
    using System.Diagnostics; 
    using System.Globalization; 
    using System.IO;
    using System.Text; 
    using System.Text.RegularExpressions;

    /// Json text reader.
    internal sealed class JsonReader : IDisposable 
    {
        /// Compiled Regex for DateTime Format. 
        private static readonly Regex DateTimeFormat = new Regex(@"^/Date\((?-?[0-9]+)\)/", RegexOptions.Compiled); 

        /// Maximum recursion limit on reader. 
        private const int RecursionLimit = 200;

        ///  Reader to reader text into 
        private readonly TextReader reader; 

        /// Depth of recursion. 
        private int recursionDepth; 

        ///  
        /// Creates a new instance of Json reader which readers the json text
        /// from the given reader
        /// 
        /// text reader from which json payload needs to be readS 
        public JsonReader(TextReader reader)
        { 
            Debug.Assert(reader != null, "reader != null"); 
            this.reader = reader;
        } 

        /// Releases resources held onto by this object.
        public void Dispose()
        { 
            this.reader.Dispose();
        } 
 
        /// 
        /// Converts the given value into the right type 
        /// 
        /// returns the clr object instance which 
        public object ReadValue()
        { 
            this.RecurseEnter();
 
            object value = null; 
            bool allowNull = false;
 
            char ch = this.PeekNextSignificantCharacter();
            if (ch == '[')
            {
                value = this.ReadArray(); 
            }
            else if (ch == '{') 
            { 
                value = this.ReadObject();
            } 
            else if ((ch == '\'') || (ch == '"'))
            {
                bool hasLeadingSlash;
                string s = this.ReadString(out hasLeadingSlash); 
                value = s; // may be overwritten with a DateTime if ends up being a date/time
 
                // Atlas format for date/time 
                if (hasLeadingSlash)
                { 
                    Match match = DateTimeFormat.Match(s);
                    if (match.Success)
                    {
                        string ticksStr = match.Groups["ticks"].Value; 

                        long ticks; 
                        if (long.TryParse(ticksStr, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out ticks)) 
                        {
                            // The javascript ticks start from 1/1/1970 but FX DateTime ticks start from 1/1/0001 
                            DateTime dateTime = new DateTime(ticks * 10000 + JsonWriter.DatetimeMinTimeTicks, DateTimeKind.Utc);
                            value = dateTime;
                        }
                    } 
                }
            } 
            else if (Char.IsDigit(ch) || (ch == '-') || (ch == '.')) 
            {
                value = this.ReadNumber(); 
            }
            else if ((ch == 't') || (ch == 'f'))
            {
                value = this.ReadBoolean(); 
            }
            else if (ch == 'n') 
            { 
                this.ReadNull();
                allowNull = true; 
            }

            if ((value == null) && (allowNull == false))
            { 
                throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent);
            } 
 
            this.RecurseLeave();
            return value; 
        }

        /// 
        /// Gets the next significant character from the reader. This function moves the enumerator by 1 position 
        /// 
        /// the next significant charater from the current reader position 
        private char GetNextSignificantCharacter() 
        {
            char ch = (char)this.reader.Read(); 
            return ch;
        }

        ///  
        /// Returns the next count characters from the reader's current position
        ///  
        /// number of characters to return 
        /// string consisting of next count characters
        private string GetCharacters(int count) 
        {
            StringBuilder stringBuilder = new StringBuilder();
            for (int i = 0; i < count; i++)
            { 
                char ch = (char)this.reader.Read();
                if (ch == '\0') 
                { 
                    return null;
                } 

                stringBuilder.Append(ch);
            }
 
            return stringBuilder.ToString();
        } 
 
        /// 
        /// Sets the readers position to the next significant character position 
        /// 
        /// returns the next significant character without changing the current position of the reader
        private char PeekNextSignificantCharacter()
        { 
            char ch = (char)this.reader.Peek();
            while ((ch != '\0') && Char.IsWhiteSpace(ch)) 
            { 
                this.reader.Read();
                ch = (char)this.reader.Peek(); 
            }

            return ch;
        } 

        ///  
        /// Converts the given text into an arrayList 
        /// 
        /// returns the arraylist containing the list of objects 
        private ArrayList ReadArray()
        {
            ArrayList array = new ArrayList();
 
            // Consume the '['
            this.reader.Read(); 
 
            while (true)
            { 
                char ch = this.PeekNextSignificantCharacter();
                if (ch == '\0')
                {
                    throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent); 
                }
 
                if (ch == ']') 
                {
                    this.reader.Read(); 
                    return array;
                }

                if (array.Count != 0) 
                {
                    if (ch != ',') 
                    { 
                        throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_MissingArrayMemberSeperator);
                    } 
                    else
                    {
                        this.reader.Read();
                    } 
                }
 
                object item = this.ReadValue(); 
                array.Add(item);
            } 
        }

        /// 
        /// Reads the boolean value 
        /// 
        /// returns the boolean value as read from the reader 
        private bool ReadBoolean() 
        {
            string s = this.ReadName(/* allowQuotes */ false); 

            if (s != null)
            {
                if (s.Equals(XmlConstants.XmlTrueLiteral, StringComparison.Ordinal)) 
                {
                    return true; 
                } 
                else if (s.Equals(XmlConstants.XmlFalseLiteral, StringComparison.Ordinal))
                { 
                    return false;
                }
            }
 
            throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidKeyword(s));
        } 
 
        /// 
        /// Reads the name string from the reader 
        /// 
        /// true, if you want to allow quotes, otherwise false
        /// string name value
        private string ReadName(bool allowQuotes) 
        {
            char ch = this.PeekNextSignificantCharacter(); 
 
            if ((ch == '"') || (ch == '\''))
            { 
                if (allowQuotes)
                {
                    return this.ReadString();
                } 
            }
            else 
            { 
                StringBuilder sb = new StringBuilder();
 
                while (true)
                {
                    ch = (char)this.reader.Peek();
                    if ((ch == '_') || Char.IsLetterOrDigit(ch) || ch == '$') 
                    {
                        this.reader.Read(); 
                        sb.Append(ch); 
                    }
                    else 
                    {
                        return sb.ToString();
                    }
                } 
            }
 
            return null; 
        }
 
        /// 
        /// Reads the null literal from the reader
        /// 
        private void ReadNull() 
        {
            string s = this.ReadName(/* allowQuotes */ false); 
 
            if (s == null)
            { 
                throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_MissingMemberName);
            }
            else if (!s.Equals("null", StringComparison.Ordinal))
            { 
                throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidKeyword(s));
            } 
        } 

        /// Reads the number from the reader. 
        /// reads the clr number object
        private object ReadNumber()
        {
            char ch = (char)this.reader.Read(); 

            StringBuilder sb = new StringBuilder(); 
 
            sb.Append(ch);
            while (true) 
            {
                ch = this.PeekNextSignificantCharacter();

                if (Char.IsDigit(ch) || (ch == '.') || (ch == 'E') || (ch == 'e') || (ch == '-') || (ch == '+')) 
                {
                    this.reader.Read(); 
                    sb.Append(ch); 
                }
                else 
                {
                    break;
                }
            } 

            string s = sb.ToString(); 
            Double doubleValue; 
            int intValue;
 
            // We will first try and convert this int32. If this succeeds, great. Otherwise, we will try
            // and convert this into a double.
            if (Int32.TryParse(s, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out intValue))
            { 
                return intValue;
            } 
            else if (Double.TryParse(s, NumberStyles.Float, NumberFormatInfo.InvariantInfo, out doubleValue)) 
            {
                return doubleValue; 
            }

            throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent);
        } 

        ///  
        /// Reads the object from the reader 
        /// 
        /// returns hashtable containing the list of property names and values 
        private Hashtable ReadObject()
        {
            Hashtable record = new Hashtable();
 
            // Consume the '{'
            this.reader.Read(); 
 
            while (true)
            { 
                char ch = this.PeekNextSignificantCharacter();
                if (ch == '\0')
                {
                    // Unterminated Object literal 
                    throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent);
                } 
 
                if (ch == '}')
                { 
                    this.reader.Read();
                    return record;
                }
 
                if (record.Count != 0)
                { 
                    if (ch != ',') 
                    {
                        throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_MissingMemberSeperator); 
                    }
                    else
                    {
                        this.reader.Read(); 
                    }
                } 
 
                string name = this.ReadName(/* allowQuotes */ true);
                if (String.IsNullOrEmpty(name)) 
                {
                    throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidJsonNameSpecifiedOrExtraComma);
                }
 
                ch = this.PeekNextSignificantCharacter();
 
                // Unexpected name/value pair syntax in object literal 
                if (ch != ':')
                { 
                    throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_MissingNameValueSeperator(name));
                }
                else
                { 
                    this.reader.Read();
                } 
 
                object item = this.ReadValue();
                record[name] = item; 
            }
        }

        ///  
        /// Read the string value from the reader
        ///  
        /// returns the string value read from the reader 
        private string ReadString()
        { 
            bool dummy;
            return this.ReadString(out dummy);
        }
 
        /// 
        /// Read the string value from the reader 
        ///  
        /// out parameter indicating whether the string has a leading slash or not
        /// returns the string value read from the reader 
        private string ReadString(out bool hasLeadingSlash)
        {
            StringBuilder sb = new StringBuilder();
 
            char endQuoteCharacter = (char)this.reader.Read();
            bool insideEscape = false; 
            bool firstCharacter = true; 
            hasLeadingSlash = false;
 
            while (true)
            {
                char ch = this.GetNextSignificantCharacter();
 
                // Unterminated string literal
                if (ch == '\0') 
                { 
                    throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent);
                } 

                if (firstCharacter)
                {
                    if (ch == '\\') 
                    {
                        hasLeadingSlash = true; 
                    } 

                    firstCharacter = false; 
                }

                if (insideEscape)
                { 
                    if (ch == 'u')
                    { 
                        string unicodeSequence = this.GetCharacters(4); 

                        // Unterminated string literal 
                        if (unicodeSequence == null)
                        {
                            throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent);
                        } 

                        ch = (char)Int32.Parse(unicodeSequence, NumberStyles.HexNumber, CultureInfo.InvariantCulture); 
                    } 

                    // From 4627, section 2.5, here's the list of characters that we should be escaping 
                    if (ch == 'b')
                    {
                        sb.Append('\b');
                    } 
                    else if (ch == 'f')
                    { 
                        sb.Append('\f'); 
                    }
                    else if (ch == 'n') 
                    {
                        sb.Append('\n');
                    }
                    else if (ch == 'r') 
                    {
                        sb.Append('\r'); 
                    } 
                    else if (ch == 't')
                    { 
                        sb.Append('\t');
                    }
                    else
                    { 
                        sb.Append(ch);
                    } 
 
                    insideEscape = false;
                    continue; 
                }

                if (ch == '\\')
                { 
                    insideEscape = true;
                    continue; 
                } 

                if (ch == endQuoteCharacter) 
                {
                    return sb.ToString();
                }
 
                sb.Append(ch);
            } 
        } 

        /// Marks the fact that a recursive method was entered, and checks that the depth is allowed. 
        private void RecurseEnter()
        {
            this.recursionDepth++;
            Debug.Assert(this.recursionDepth <= RecursionLimit, "this.recursionDepth <= RecursionLimit"); 
            if (this.recursionDepth == RecursionLimit)
            { 
                // 400 - Bad Request 
                throw DataServiceException.CreateDeepRecursion(RecursionLimit);
            } 
        }

        /// Marks the fact that a recursive method is leaving..
        private void RecurseLeave() 
        {
            this.recursionDepth--; 
            Debug.Assert(0 <= this.recursionDepth, "0 <= this.recursionDepth"); 
            Debug.Assert(this.recursionDepth < RecursionLimit, "this.recursionDepth < RecursionLimit");
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
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