ControlIdConverter.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 / 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 { 

 
        ///  
        ///    Determines whether a given control should have its id added to the StandardValuesCollection.
        ///  
        protected virtual bool FilterControl(Control control) {
            return true;
        }
 
        /// 
        /// 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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