Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / ControlIdConverter.cs / 1 / ControlIdConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls { using System.Collections; using System.ComponentModel; using System.ComponentModel.Design; using System.Globalization; using System.Reflection; using System.Web.Util; using System.Security.Permissions; ////// TypeConverter for ControlParameter's ControlID property. /// [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] public class ControlIDConverter : StringConverter { ////// protected virtual bool FilterControl(Control control) { return true; } ///Determines whether a given control should have its id added to the StandardValuesCollection. ////// Returns a list of all control IDs in the container. /// private string[] GetControls(IDesignerHost host, object instance) { IContainer container = host.Container; // Locate nearest container IComponent component = instance as IComponent; if (component != null && component.Site != null) { container = component.Site.Container; } if (container == null) { return null; } ComponentCollection allComponents = container.Components; ArrayList array = new ArrayList(); // For each control in the container foreach (IComponent comp in (IEnumerable)allComponents) { Control control = comp as Control; // Ignore DesignerHost.RootComponent (Page or UserControl), controls that don't have ID's, // and the Control itself if (control != null && control != instance && control != host.RootComponent && control.ID != null && control.ID.Length > 0 && FilterControl(control)) { array.Add(control.ID); } } array.Sort(Comparer.Default); return (string[])array.ToArray(typeof(string)); } ////// Returns a collection of standard values retrieved from the context specified /// by the specified type descriptor. /// public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) { if (context == null) { return null; } IDesignerHost host = (IDesignerHost)context.GetService(typeof(IDesignerHost)); Debug.Assert(host != null, "Unable to get IDesignerHost in ControlIDConverter"); if (host != null) { string[] controlIDs = GetControls(host, context.Instance); if (controlIDs == null) { return null; } return new StandardValuesCollection(controlIDs); } return null; } ////// Gets whether or not the context specified contains exclusive standard values. /// public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) { return false; } ////// Gets whether or not the specified context contains supported standard values. /// public override bool GetStandardValuesSupported(ITypeDescriptorContext context) { return (context != null); } } }
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