WebPartTracker.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebParts / WebPartTracker.cs / 1 / WebPartTracker.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 
namespace System.Web.UI.WebControls.WebParts {
 
    using System; 
    using System.Collections;
    using System.ComponentModel; 
    using System.Diagnostics;
    using System.Drawing.Design;
    using System.Security.Permissions;
    using System.Web; 
    using System.Web.UI;
 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public sealed class WebPartTracker : IDisposable {
        private bool _disposed; 
        private WebPart _webPart;
        private ProviderConnectionPoint _providerConnectionPoint;

        public WebPartTracker(WebPart webPart, ProviderConnectionPoint providerConnectionPoint) { 
            if (webPart == null) {
                throw new ArgumentNullException("webPart"); 
            } 

            if (providerConnectionPoint == null) { 
                throw new ArgumentNullException("providerConnectionPoint");
            }

            if (providerConnectionPoint.ControlType != webPart.GetType()) { 
                throw new ArgumentException(SR.GetString(SR.WebPartManager_InvalidConnectionPoint), "providerConnectionPoint");
            } 
 
            _webPart = webPart;
            _providerConnectionPoint = providerConnectionPoint; 

            if (++Count > 1) {
                webPart.SetConnectErrorMessage(SR.GetString(
                    SR.WebPartTracker_CircularConnection, _providerConnectionPoint.DisplayName)); 
            }
        } 
 
        public bool IsCircularConnection {
            get { 
                return (Count > 1);
            }
        }
 
        private int Count {
            get { 
                int count; 
                _webPart.TrackerCounter.TryGetValue(_providerConnectionPoint, out count);
                return count; 
            }
            set {
                _webPart.TrackerCounter[_providerConnectionPoint] = value;
            } 
        }
 
        void IDisposable.Dispose() { 
            if (!_disposed) {
                Debug.Assert(Count >= 1); 
                Count--;
                _disposed = true;
            }
        } 
    }
}

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