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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