ConnectionPoint.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 / WebParts / ConnectionPoint.cs / 1305376 / ConnectionPoint.cs
                        

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

namespace System.Web.UI.WebControls.WebParts { 
 
    using System;
    using System.Reflection; 
    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. 
    ///  
    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;
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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