ConnectionPoint.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 / ConnectionPoint.cs / 1 / ConnectionPoint.cs
                        

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

namespace System.Web.UI.WebControls.WebParts { 
 
    using System;
    using System.Reflection; 
    using System.Security.Permissions;
    using System.Web;
    using System.Web.Util;
 
    /// 
    /// A ConnectionPoint defines a possible connection. A WebPart uses this 
    /// to define the connections it can provide or consume. 
    /// 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public abstract class ConnectionPoint {
        private MethodInfo _callbackMethod;
        private Type _controlType; 
        private Type _interfaceType;
        private string _displayName; 
        private string _id; 
        private bool _allowsMultipleConnections;
 
        // We do not want the public field to be "const", since that means we can never change its value.
        // We want the internal const field so we can use it in attributes.
        public static readonly string DefaultID = DefaultIDInternal;
        internal const string DefaultIDInternal = "default"; 

        // 
 
        internal ConnectionPoint(MethodInfo callbackMethod, Type interfaceType, Type controlType, string displayName, string id, bool allowsMultipleConnections) {
            if (callbackMethod == null) { 
                throw new ArgumentNullException("callbackMethod");
            }

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

            if (!controlType.IsSubclassOf(typeof(Control))) {
                throw new ArgumentException(SR.GetString(SR.ConnectionPoint_InvalidControlType), "controlType"); 
            }
 
            if (String.IsNullOrEmpty(displayName)) { 
                throw new ArgumentNullException("displayName");
            } 

            _callbackMethod = callbackMethod;
            _interfaceType = interfaceType;
            _controlType = controlType; 
            _displayName = displayName;
            _id = id; 
            _allowsMultipleConnections = allowsMultipleConnections; 
        }
 
        public bool AllowsMultipleConnections {
            get {
                return _allowsMultipleConnections;
            } 
        }
 
        internal MethodInfo CallbackMethod { 
            get {
                return _callbackMethod; 
            }
        }

        public Type ControlType { 
            get {
                return _controlType; 
            } 
        }
 
        public Type InterfaceType {
            get {
                return _interfaceType;
            } 
        }
 
        public string ID { 
            get {
                return (!String.IsNullOrEmpty(_id)) ? _id : DefaultID; 
            }
        }

        public string DisplayName { 
            get {
                return _displayName; 
            } 
        }
 
        /// 
        /// Base implementation returns true, can be overridden by subclasses to return
        /// true or false conditionally based on the state of the Control.
        ///  
        public virtual bool GetEnabled(Control control) {
            return true; 
        } 
    }
}

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