DataControlLinkButton.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 / WebControls / DataControlLinkButton.cs / 1 / DataControlLinkButton.cs
                        

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

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.Drawing; 
    using System.Web.Util;


    ///  
    ///  Derived version of LinkButton used within a DataControl.
    ///  
    [SupportsEventValidation] 
    internal class DataControlLinkButton : LinkButton {
 
        IPostBackContainer _container;
        string _callbackArgument;
        bool _enableCallback;
 
        internal DataControlLinkButton(IPostBackContainer container) {
            _container = container; 
        } 

        public override bool CausesValidation { 
            get {
                if (_container != null) {
                    return false;
                } 
                return base.CausesValidation;
            } 
            set { 
                if (_container != null) {
                    throw new NotSupportedException(SR.GetString(SR.CannotSetValidationOnDataControlButtons)); 
                }
                base.CausesValidation = value;
            }
        } 

        internal void EnableCallback(string argument) { 
            _enableCallback = true; 
            _callbackArgument = argument;
        } 

        protected override PostBackOptions GetPostBackOptions() {
            if (_container != null) {
                return _container.GetPostBackOptions(this); 
            }
 
            return base.GetPostBackOptions(); 
        }
 
        protected internal override void Render(HtmlTextWriter writer) {
            SetCallbackProperties();
            SetForeColor();
            base.Render(writer); 
        }
 
        private void SetCallbackProperties() { 
            if (_enableCallback) {
                ICallbackContainer _callbackContainer = _container as ICallbackContainer; 
                if (_callbackContainer != null) {
                    string callbackScript = _callbackContainer.GetCallbackScript(this, _callbackArgument);
                    if (!String.IsNullOrEmpty(callbackScript)) {
                        this.OnClientClick = callbackScript; 
                    }
                } 
            } 
        }
 

        /// 
        ///  In HTML hyperlinks always use the browser's link color.
        ///  For the DataControl, we want all LinkButtons to honor the ForeColor setting. 
        ///  This requires looking up into the control hierarchy to see if either the cell
        ///  or the containing row or table define a ForeColor. 
        ///  
        protected virtual void SetForeColor() {
            if (ControlStyle.IsSet(System.Web.UI.WebControls.Style.PROP_FORECOLOR) == false) { 
                Color hyperLinkForeColor;
                Control control = this;

                for (int i = 0; i < 3; i++) { 
                    control = control.Parent;
 
                    Debug.Assert(((i == 0) && (control is TableCell)) || 
                                 ((i == 1) && (control is TableRow)) ||
                                 ((i == 2) && (control is Table))); 
                    hyperLinkForeColor = ((WebControl)control).ForeColor;
                    if (hyperLinkForeColor != Color.Empty) {
                        ForeColor = hyperLinkForeColor;
                        break; 
                    }
                } 
            } 
        }
    } 
}

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