Substitution.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 / Substitution.cs / 1 / Substitution.cs

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

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.ComponentModel; 
    using System.Globalization;
    using System.Security.Permissions;
    using System.Web;
    using System.Web.UI; 

 
    ///  
    /// 
    ///  
    [
    DefaultProperty("MethodName"),
    Designer("System.Web.UI.Design.WebControls.SubstitutionDesigner, " + AssemblyRef.SystemDesign),
    ParseChildren(true), 
    PersistChildren(false),
    ] 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public class Substitution : Control { 


        /// 
        ///  
        /// 
        public Substitution() { 
        } 

 
        /// 
        /// 
        /// 
        [ 
        DefaultValue(""),
        WebCategory("Behavior"), 
        WebSysDescription(SR.Substitution_MethodNameDescr) 
        ]
        public virtual string MethodName { 
            get {
                string s = ViewState["MethodName"] as string;
                return s == null? String.Empty : s;
            } 
            set {
                ViewState["MethodName"] = value; 
            } 
        }
 

        protected override ControlCollection CreateControlCollection() {
            return new EmptyControlCollection(this);
        } 

        // SECURITY CODE 
 

 



 

 
 

 

        // VSWhidbey 253188: Permission assert to support page running below full trust
        [ReflectionPermission(SecurityAction.Assert, Flags=ReflectionPermissionFlag.MemberAccess)]
        private HttpResponseSubstitutionCallback GetDelegate(Type targetType, string methodName) { 
            return (HttpResponseSubstitutionCallback)Delegate.CreateDelegate(
                        typeof(HttpResponseSubstitutionCallback), targetType, methodName); 
        } 

        protected internal override void OnPreRender(EventArgs e) { 
            base.OnPreRender(e);

            // VSWhidbey 84748: Temp fix, throw if we are within a cached control
            Control parent = Parent; 
            while (parent != null) {
                if (parent is BasePartialCachingControl) { 
                    throw new HttpException( 
                        SR.GetString(SR.Substitution_CannotBeInCachedControl));
                } 
                parent = parent.Parent;
            }
        }
 

        protected internal override void Render(HtmlTextWriter writer) { 
            RenderMarkup(writer); 
        }
 
        internal void RenderMarkup(HtmlTextWriter writer) {
            if (MethodName.Length == 0) {
                return;
            } 

            TemplateControl target = TemplateControl; 
            if (target == null) { 
                return;
            } 

            // get the delegate to the method
            HttpResponseSubstitutionCallback callback = null;
 
            try {
                 callback = GetDelegate(target.GetType(), MethodName); 
            } 
            catch {
            } 

            if (callback == null) {
                throw new HttpException(
                    SR.GetString(SR.Substitution_BadMethodName, MethodName)); 
            }
 
            // add the substitution to the response 
            Page.Response.WriteSubstitution(callback);
        } 
    }
}
                        

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