WebPartConnectionCollection.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

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

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

namespace System.Web.UI.WebControls.WebParts { 
 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.Drawing.Design;
    using System.Globalization;
    using System.Security.Permissions; 
    using System.Web.Util;
 
    // 
    [
    Editor("System.ComponentModel.Design.CollectionEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)) 
    ]
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public sealed class WebPartConnectionCollection : CollectionBase {
 
        private bool _readOnly;
        private string _readOnlyExceptionMessage; 
        private WebPartManager _webPartManager; 

        internal WebPartConnectionCollection(WebPartManager webPartManager) { 
            _webPartManager = webPartManager;
        }

        public bool IsReadOnly { 
            get {
                return _readOnly; 
            } 
        }
 
        /// 
        /// Returns the WebPartConnection at a given index.
        /// 
        public WebPartConnection this[int index] { 
            get {
                return (WebPartConnection)List[index]; 
            } 
            set {
                List[index] = value; 
            }
        }

        ///  
        /// Returns the WebPartConnection with the specified id, performing a case-insensitive comparison.
        /// Returns null if there are no matches. 
        ///  
        public WebPartConnection this[string id] {
            // PERF: Use a hashtable for lookup, instead of a linear search 
            get {
                foreach (WebPartConnection connection in List) {
                    if (String.Equals(connection.ID, id, StringComparison.OrdinalIgnoreCase)) {
                        return connection; 
                    }
                } 
 
                return null;
            } 
        }

        /// 
        /// Adds a Connection to the collection. 
        /// 
        public int Add(WebPartConnection value) { 
            return List.Add(value); 
        }
 
        private void CheckReadOnly() {
            if (_readOnly) {
                throw new InvalidOperationException(SR.GetString(_readOnlyExceptionMessage));
            } 
        }
 
        ///  
        /// True if the WebPartConnection is contained in the collection.
        ///  
        public bool Contains(WebPartConnection value) {
            return List.Contains(value);
        }
 
        internal bool ContainsProvider(WebPart provider) {
            foreach (WebPartConnection connection in List) { 
                if (connection.Provider == provider) { 
                    return true;
                } 
            }
            return false;
        }
 
        public void CopyTo(WebPartConnection[] array, int index) {
            List.CopyTo(array, index); 
        } 

        public int IndexOf(WebPartConnection value) { 
            return List.IndexOf(value);
        }

        ///  
        /// Inserts a WebPartConnection into the collection.
        ///  
        public void Insert(int index, WebPartConnection value) { 
            List.Insert(index, value);
        } 

        /// 
        /// 
        protected override void OnClear() { 
            CheckReadOnly();
            base.OnClear(); 
        } 

        protected override void OnInsert(int index, object value) { 
            CheckReadOnly();
            ((WebPartConnection)value).SetWebPartManager(_webPartManager);
            base.OnInsert(index, value);
        } 

        protected override void OnRemove(int index, object value) { 
            CheckReadOnly(); 
            ((WebPartConnection)value).SetWebPartManager(null);
            base.OnRemove(index, value); 
        }

        protected override void OnSet(int index, object oldValue, object newValue) {
            CheckReadOnly(); 
            ((WebPartConnection)oldValue).SetWebPartManager(null);
            ((WebPartConnection)newValue).SetWebPartManager(_webPartManager); 
            base.OnSet(index, oldValue, newValue); 
        }
 
        /// 
        /// Validates that an object is a WebPartConnection.
        /// 
        protected override void OnValidate(object value) { 
            base.OnValidate(value);
            if (value == null) { 
                throw new ArgumentNullException("value", SR.GetString(SR.Collection_CantAddNull)); 
            }
            if (!(value is WebPartConnection)) { 
                throw new ArgumentException(SR.GetString(SR.Collection_InvalidType, "WebPartConnection"), "value");
            }
        }
 
        /// 
        /// Removes a WebPartConnection from the collection. 
        ///  
        public void Remove(WebPartConnection value) {
            List.Remove(value); 
        }

        /// 
        /// Marks the collection readonly. This is useful, because we assume that the list 
        /// of static connections is known at Init time, and new connections are added
        /// through the WebPartManager. 
        ///  
        internal void SetReadOnly(string exceptionMessage) {
            _readOnlyExceptionMessage = exceptionMessage; 
            _readOnly = true;
        }
    }
}

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