DefaultValueAttribute.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CompMod / System / ComponentModel / DefaultValueAttribute.cs / 1305376 / DefaultValueAttribute.cs

                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.ComponentModel { 
 
    using System;
    using System.ComponentModel; 
    using System.Diagnostics;
    using System.Globalization;
    using System.Runtime.InteropServices;
#if !SILVERLIGHT 
    using System.Runtime.Serialization.Formatters;
#endif 
    using System.Security.Permissions; 

    ///  
    ///    Specifies the default value for a property.
    /// 
#if !SILVERLIGHT
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1019:DefineAccessorsForAttributeArguments")] 
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1813:AvoidUnsealedAttributes")]
#endif 
    [AttributeUsage(AttributeTargets.All)] 
    public class DefaultValueAttribute : Attribute {
        ///  
        ///     This is the default value.
        /// 
        private object value;
 
        /// 
        /// Initializes a new instance of the  class, converting the 
        ///    specified value to the 
        ///    specified type, and using the U.S. English culture as the
        ///    translation 
        ///    context.
        /// 
        public DefaultValueAttribute(Type type, string value) {
 
            // The try/catch here is because attributes should never throw exceptions.  We would fail to
            // load an otherwise normal class. 
            try { 
#if !SILVERLIGHT
                this.value = TypeDescriptor.GetConverter(type).ConvertFromInvariantString(value); 
#else
                if (type.IsEnum) {
                    this.value = Enum.Parse(type, value, true);
                } else if (type == typeof(TimeSpan)) { 
                    this.value = TimeSpan.Parse(value);
                } else if (type.Module == typeof(string).Module) { 
                    this.value = Convert.ChangeType(value, type, CultureInfo.InvariantCulture); 
                }
#endif 
            }
            catch {
#if !SILVERLIGHT
                Debug.Fail("Default value attribute of type " + type.FullName + " threw converting from the string '" + value + "'."); 
#else
                Debug.WriteLine("Default value attribute of type " + type.FullName + " threw converting from the string '" + value + "'."); 
#endif 
            }
        } 

        /// 
        /// Initializes a new instance of the  class using a Unicode
        ///    character. 
        /// 
        public DefaultValueAttribute(char value) { 
            this.value = value; 
        }
        ///  
        /// Initializes a new instance of the  class using an 8-bit unsigned
        ///    integer.
        /// 
        public DefaultValueAttribute(byte value) { 
            this.value = value;
        } 
        ///  
        /// Initializes a new instance of the  class using a 16-bit signed
        ///    integer. 
        /// 
        public DefaultValueAttribute(short value) {
            this.value = value;
        } 
        /// 
        /// Initializes a new instance of the  class using a 32-bit signed 
        ///    integer. 
        /// 
        public DefaultValueAttribute(int value) { 
            this.value = value;
        }
        /// 
        /// Initializes a new instance of the  class using a 64-bit signed 
        ///    integer.
        ///  
        public DefaultValueAttribute(long value) { 
            this.value = value;
        } 
        /// 
        /// Initializes a new instance of the  class using a
        ///    single-precision floating point
        ///    number. 
        /// 
        public DefaultValueAttribute(float value) { 
            this.value = value; 
        }
        ///  
        /// Initializes a new instance of the  class using a
        ///    double-precision floating point
        ///    number.
        ///  
        public DefaultValueAttribute(double value) {
            this.value = value; 
        } 
        /// 
        /// Initializes a new instance of the  class using a  
        /// value.
        /// 
        public DefaultValueAttribute(bool value) {
            this.value = value; 
        }
        ///  
        /// Initializes a new instance of the  class using a . 
        /// 
        public DefaultValueAttribute(string value) { 
            this.value = value;
        }

        ///  
        /// Initializes a new instance of the 
        /// class. 
        ///  
        public DefaultValueAttribute(object value) {
            this.value = value; 
        }

        /// 
        ///     
        ///       Gets the default value of the property this
        ///       attribute is 
        ///       bound to. 
        ///    
        ///  
        public virtual object Value {
            get {
                return value;
            } 
        }
 
        public override bool Equals(object obj) { 
            if (obj == this) {
                return true; 
            }

            DefaultValueAttribute other = obj as DefaultValueAttribute;
 
            if (other != null) {
                if (Value != null) { 
                    return Value.Equals(other.Value); 
                }
                else { 
                    return (other.Value == null);
                }
            }
            return false; 
        }
 
        public override int GetHashCode() { 
            return base.GetHashCode();
        } 

        protected void SetValue(object value) {
            this.value = value;
        } 
    }
} 

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

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK