ParameterCollection.cs source code in C# .NET

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Code:

/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / ParameterCollection.cs / 1 / ParameterCollection.cs

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

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.Collections; 
    using System.Collections.Specialized;
    using System.ComponentModel;
    using System.ComponentModel.Design;
    using System.Drawing.Design; 
    using System.Globalization;
    using System.Reflection; 
    using System.Web.UI; 
    using System.Web.UI.WebControls;
    using System.Web.Util; 
    using System.Security.Permissions;


    ///  
    /// A state managed collection of Parameter objects.
    /// These are used in many DataSourceControls to filter queries. 
    ///  
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [
    Editor("System.Web.UI.Design.WebControls.ParameterCollectionEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)),
    ]
    public class ParameterCollection : StateManagedCollection { 

        private EventHandler _parametersChangedHandler; 
 
        private static readonly Type[] knownTypes = new Type[] {
            typeof(ControlParameter), 
            typeof(CookieParameter),
            typeof(FormParameter),
            typeof(Parameter),
            typeof(QueryStringParameter), 
            typeof(SessionParameter),
            typeof(ProfileParameter), 
        }; 

 
        /// 
        /// Returns the Parameter at a given index.
        /// 
        public Parameter this[int index] { 
            get {
                return (Parameter)((IList)this)[index]; 
            } 
            set {
                ((IList)this)[index] = value; 
            }
        }

        ///  
        /// Returns the Parameter with a given name.
        ///  
        public Parameter this[string name] { 
            get {
                int parameterIndex = GetParameterIndex(name); 
                if (parameterIndex == -1) {
                    return null;
                }
                return this[parameterIndex]; 
            }
            set { 
                int parameterIndex = GetParameterIndex(name); 
                if (parameterIndex == -1) {
                    Add(value); 
                }
                else {
                    this[parameterIndex] = value;
                } 
            }
        } 
 
        /// 
        /// Occurs when any of the Parameter objects in the collection change or when the collection itself changes. 
        /// 
        public event EventHandler ParametersChanged {
            add {
                _parametersChangedHandler = (EventHandler)Delegate.Combine(_parametersChangedHandler, value); 
            }
            remove { 
                _parametersChangedHandler = (EventHandler)Delegate.Remove(_parametersChangedHandler, value); 
            }
        } 

        /// 
        /// Adds a Parameter to the collection.
        ///  
        public int Add(Parameter parameter) {
            return ((IList)this).Add(parameter); 
        } 

        ///  
        /// Adds a Parameter to the collection with a specified name and value.
        /// 
        public int Add(string name, string value) {
            return ((IList)this).Add(new Parameter(name, TypeCode.Empty, value)); 
        }
 
        ///  
        /// Adds a Parameter to the collection with a specified name, type, and value.
        ///  
        public int Add(string name, TypeCode type, string value) {
            return ((IList)this).Add(new Parameter(name, type, value));
        }
 
        /// 
        /// Used by Parameters to raise the ParametersChanged event. 
        ///  
        internal void CallOnParametersChanged() {
            OnParametersChanged(EventArgs.Empty); 
        }

        public bool Contains(Parameter parameter) {
            return ((IList)this).Contains(parameter); 
        }
 
 
        public void CopyTo(Parameter[] parameterArray, int index) {
            base.CopyTo(parameterArray, index); 
        }

        /// 
        /// Creates a known type of Parameter. 
        /// 
        protected override object CreateKnownType(int index) { 
            switch (index) { 
                case 0:
                    return new ControlParameter(); 
                case 1:
                    return new CookieParameter();
                case 2:
                    return new FormParameter(); 
                case 3:
                    return new Parameter(); 
                case 4: 
                    return new QueryStringParameter();
                case 5: 
                    return new SessionParameter();
                case 6:
                    return new ProfileParameter();
                default: 
                    throw new ArgumentOutOfRangeException("index");
            } 
        } 

        ///  
        /// Returns an ArrayList of known Parameter types.
        /// 
        protected override Type[] GetKnownTypes() {
            return knownTypes; 
        }
 
        ///  
        /// Returns the index of a parameter by name.
        ///  
        private int GetParameterIndex(string name) {
            for (int i = 0; i < Count; i++) {
                if (String.Equals(this[i].Name, name, StringComparison.OrdinalIgnoreCase)) {
                    return i; 
                }
            } 
            return -1; 
        }
 
        /// 
        /// Returns an IDictionary containing Name / Value pairs of all the parameters.
        /// 
        public IOrderedDictionary GetValues(HttpContext context, Control control) { 
            UpdateValues(context, control);
 
                // Create dictionary 
            IOrderedDictionary valueDictionary = new OrderedDictionary();
 
            // Add Parameters
            foreach (Parameter param in this) {
                // For the OrderedDictionary, every parameter must have a unique name, so in some cases we have to alter them.
                string uniqueName = param.Name; 
                int count = 1;
                while (valueDictionary.Contains(uniqueName)) { 
                    uniqueName = param.Name + count.ToString(CultureInfo.InvariantCulture); 
                    count++;
                } 
                valueDictionary.Add(uniqueName, param.ParameterValue);
            }

            return valueDictionary; 
        }
 
        public int IndexOf(Parameter parameter) { 
            return ((IList)this).IndexOf(parameter);
        } 

        /// 
        /// Inserts a Parameter into the collection.
        ///  
        public void Insert(int index, Parameter parameter) {
            ((IList)this).Insert(index, parameter); 
        } 

        ///  
        /// Called when the Clear() method is complete.
        /// 
        protected override void OnClearComplete() {
            base.OnClearComplete(); 

            OnParametersChanged(EventArgs.Empty); 
        } 

        ///  
        /// Called when the Insert() method is starting.
        /// Adds an event handler to listen to the Parameter's ParameterChanged event.
        /// 
        protected override void OnInsert(int index, object value) { 
            base.OnInsert(index, value);
 
            // Set owner (we are guaranteed that it is a Parameter 
            // in OnValidate).
            ((Parameter)value).SetOwner(this); 
        }

        /// 
        /// Called when the Insert() method is complete. 
        /// 
        protected override void OnInsertComplete(int index, object value) { 
            base.OnInsertComplete(index, value); 

            OnParametersChanged(EventArgs.Empty); 
        }

        /// 
        /// Raises the ParametersChanged event. 
        /// 
        protected virtual void OnParametersChanged(EventArgs e) { 
            if (_parametersChangedHandler != null) { 
                _parametersChangedHandler(this, e);
            } 
        }

        /// 
        /// Called when the Remove() method is complete. 
        /// 
        protected override void OnRemoveComplete(int index, object value) { 
            base.OnRemoveComplete(index, value); 

            // Clear owner 
            ((Parameter)value).SetOwner(null);

            OnParametersChanged(EventArgs.Empty);
        } 

        ///  
        /// Validates that an object is a Parameter. 
        /// 
        protected override void OnValidate(object o) { 
            base.OnValidate(o);

            if (!(o is Parameter))
                throw new ArgumentException(SR.GetString(SR.ParameterCollection_NotParameter), "o"); 
        }
 
        ///  
        /// Removes a Parameter from the collection.
        ///  
        public void Remove(Parameter parameter) {
            ((IList)this).Remove(parameter);
        }
 
        /// 
        /// Removes a Parameter from the collection at a given index. 
        ///  
        public void RemoveAt(int index) {
            ((IList)this).RemoveAt(index); 
        }

        /// 
        /// Marks a Parameter as dirty so that it will record its entire state into view state. 
        /// 
        protected override void SetDirtyObject(object o) { 
            ((Parameter)o).SetDirty(); 
        }
 
        /// 
        /// Updates all parameter values to possibly raise a ParametersChanged event.
        /// 
        public void UpdateValues(HttpContext context, Control control) { 
            foreach (Parameter param in this) {
                param.UpdateValue(context, control); 
            } 
        }
    } 
}
                        

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