WebResourceUtil.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / Orcas / RTM / ndp / fx / src / xsp / System / Web / Extensions / ui / WebResourceUtil.cs / 1 / WebResourceUtil.cs
                        

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

namespace System.Web.UI { 
    using System; 
    using System.Reflection;
    using System.Diagnostics; 
    using System.Collections;
    using System.Globalization;
    using System.Web.UI;
    using System.Web.Resources; 
    using System.Web.Util;
 
    internal static class WebResourceUtil { 
        // Maps Pair(resourceName, assembly) to bool
        private static readonly Hashtable _assemblyContainsWebResourceCache = Hashtable.Synchronized(new Hashtable()); 

        // Returns true if the assembly contains a Web resource and an embedded resource with
        // the sepecified name.  Throws exception if assembly contains Web resource but no
        // embedded resource, since this is always an error. 
        public static bool AssemblyContainsWebResource(Assembly assembly, string resourceName) {
            // PERF: Special-case known resources in our own assembly 
            if (assembly == AssemblyCache.SystemWebExtensions) { 
                return SystemWebExtensionsContainsWebResource(resourceName);
            } 

            // Getting and checking the custom attributes is expensive, so we cache the result
            // of the lookup.
            Pair key = new Pair(resourceName, assembly); 
            object assemblyContainsWebResource = _assemblyContainsWebResourceCache[key];
 
            if (assemblyContainsWebResource == null) { 
                assemblyContainsWebResource = false;
 
                object[] attrs = assembly.GetCustomAttributes(typeof(WebResourceAttribute), false);
                foreach (WebResourceAttribute attr in attrs) {
                    // Resource names are always case-sensitive
                    if (String.Equals(attr.WebResource, resourceName, StringComparison.Ordinal)) { 
                        if (assembly.GetManifestResourceStream(resourceName) != null) {
                            assemblyContainsWebResource = true; 
                            break; 
                        }
                        else { 
                            // Always an error to contain Web resource but not embedded resource.
                            throw new InvalidOperationException(String.Format(
                                CultureInfo.CurrentUICulture,
                                AtlasWeb.WebResourceUtil_AssemblyDoesNotContainEmbeddedResource, 
                                assembly, resourceName));
                        } 
                    } 
                }
 
                _assemblyContainsWebResourceCache[key] = assemblyContainsWebResource;
            }

            return (bool)assemblyContainsWebResource; 
        }
 
        private static bool SystemWebExtensionsContainsWebResource(string resourceName) { 
            // PERF: Switching over the length is more performant than switching over the string itself
            // or checking equality against each string.  When switching over the string itself, the switch 
            // is compiled to a lookup in a static Dictionary, which is 5-10 times slower than
            // switching over the length.  Checking equality against each string ranges from equal performance
            // to 10 times slower, depending on how early a match is found.
            switch (resourceName.Length) { 
                case 16:
                    return resourceName == "MicrosoftAjax.js"; 
                case 24: 
                    return resourceName == "MicrosoftAjaxWebForms.js";
                case 21: 
                    return resourceName == "MicrosoftAjaxTimer.js";
                case 22:
                    return resourceName == "MicrosoftAjax.debug.js";
                case 30: 
                    return resourceName == "MicrosoftAjaxWebForms.debug.js";
                case 27: 
                    return resourceName == "MicrosoftAjaxTimer.debug.js"; 
                default:
                    return false; 
            }
        }

        // Throws exception if the assembly does not contain a Web resource and an embedded resource 
        // with the specified name.
        public static void VerifyAssemblyContainsReleaseWebResource(Assembly assembly, string releaseResourceName) { 
            if (!AssemblyContainsWebResource(assembly, releaseResourceName)) { 
                throw new InvalidOperationException(String.Format(
                    CultureInfo.CurrentUICulture, 
                    AtlasWeb.WebResourceUtil_AssemblyDoesNotContainReleaseWebResource,
                    assembly, releaseResourceName));
            }
        } 

        // Throws exception if the assembly does not contain a Web resource and an embedded resource 
        // with the specified name. 
        public static void VerifyAssemblyContainsDebugWebResource(Assembly assembly, string debugResourceName) {
            if (!AssemblyContainsWebResource(assembly, debugResourceName)) { 
                throw new InvalidOperationException(String.Format(
                    CultureInfo.CurrentUICulture,
                    AtlasWeb.WebResourceUtil_AssemblyDoesNotContainDebugWebResource,
                   assembly, debugResourceName)); 
            }
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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