ParameterCollection.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 / xsp / System / Web / UI / WebControls / ParameterCollection.cs / 1305376 / 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.Data; 
    using System.Drawing.Design;
    using System.Globalization; 
    using System.Reflection; 
    using System.Web.UI;
    using System.Web.UI.WebControls; 
    using System.Web.Util;


    ///  
    /// A state managed collection of Parameter objects.
    /// These are used in many DataSourceControls to filter queries. 
    ///  
    [
    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)); 
        }

        /// 
        /// Adds a Parameter to the collection with a specified name, database type, and value. 
        /// 
        public int Add(string name, DbType dbType, string value) { 
            return ((IList)this).Add(new Parameter(name, dbType, 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);
            }
        } 
    }
} 
 

// 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