AssemblyCache.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Extensions / UI / AssemblyCache.cs / 1305376 / AssemblyCache.cs
                        

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

namespace System.Web.UI { 
    using System; 
    using System.Collections;
    using System.Collections.Concurrent; 
    using System.Diagnostics;
    using System.Reflection;
    using System.Web.Configuration;
    using System.Web.Script; 

    // Caches Assembly APIs to improve performance 
    internal static class AssemblyCache { 
        // PERF: Cache reference to System.Web.Extensions assembly. Use ScriptManager since it's guaranteed to be in S.W.E
        public static readonly Assembly SystemWebExtensions = typeof(ScriptManager).Assembly; 
        public static readonly Assembly SystemWeb = typeof(Page).Assembly;

        private static CompilationSection _compilationSection;
        internal static bool _useCompilationSection = true; 

        // Maps string (assembly name) to Assembly 
        private static readonly Hashtable _assemblyCache = Hashtable.Synchronized(new Hashtable()); 
        // Maps assembly to Version
        // internal so it can be manipulated by the unit test suite 
        internal static readonly Hashtable _versionCache = Hashtable.Synchronized(new Hashtable());
        // Maps an assembly to its ajax framework assembly attribute. If it doesn't have one, it maps it to a null value
        private static readonly ConcurrentDictionary _ajaxAssemblyAttributeCache =
            new ConcurrentDictionary(); 

        private static CompilationSection CompilationSection { 
            get { 
                if (_compilationSection == null) {
                    _compilationSection = RuntimeConfig.GetAppConfig().Compilation; 
                }
                return _compilationSection;
            }
        } 

        public static Version GetVersion(Assembly assembly) { 
            Debug.Assert(assembly != null); 
            Version version = (Version)_versionCache[assembly];
            if (version == null) { 
                // use new AssemblyName() instead of assembly.GetName() so it works in medium trust
                version = new AssemblyName(assembly.FullName).Version;
                _versionCache[assembly] = version;
            } 
            return version;
        } 
 
        public static Assembly Load(string assemblyName) {
            Debug.Assert(!String.IsNullOrEmpty(assemblyName)); 
            Assembly assembly = (Assembly)_assemblyCache[assemblyName];
            if (assembly == null) {
                // _useCompilationSection must be set to false in a unit test environment since there
                // is no http runtime, and therefore no trust level is set. 
                if (_useCompilationSection) {
                    assembly = CompilationSection.LoadAssembly(assemblyName, true); 
                } 
                else {
                    assembly = Assembly.Load(assemblyName); 
                }
                _assemblyCache[assemblyName] = assembly;
            }
            return assembly; 
        }
 
        public static bool IsAjaxFrameworkAssembly(Assembly assembly) { 
            return (GetAjaxFrameworkAssemblyAttribute(assembly) != null);
        } 

        public static AjaxFrameworkAssemblyAttribute GetAjaxFrameworkAssemblyAttribute(Assembly assembly) {
            Debug.Assert(assembly != null);
            AjaxFrameworkAssemblyAttribute ajaxFrameworkAssemblyAttribute = null; 
            if (!_ajaxAssemblyAttributeCache.TryGetValue(assembly, out ajaxFrameworkAssemblyAttribute)) {
                foreach (Attribute attribute in assembly.GetCustomAttributes(false)) { 
                    if (attribute is AjaxFrameworkAssemblyAttribute) { 
                        ajaxFrameworkAssemblyAttribute = (AjaxFrameworkAssemblyAttribute)attribute;
                        break; 
                    }
                }
                _ajaxAssemblyAttributeCache.TryAdd(assembly, ajaxFrameworkAssemblyAttribute);
            } 
            return ajaxFrameworkAssemblyAttribute;
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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