Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / AspProxy.cs / 1305376 / AspProxy.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Reflection; using System.Diagnostics; using System.Data.Entity; using System.Collections.Generic; using System.Collections; using System.Linq; namespace System.Data.Metadata.Edm { internal class AspProxy { private const string BUILD_MANAGER_TYPE_NAME = @"System.Web.Compilation.BuildManager"; private Assembly _webAssembly; private bool _triedLoadingWebAssembly = false; ////// Determine whether we are inside an ASP.NET application. /// /// The System.Web assembly ///true if we are running inside an ASP.NET application internal bool IsAspNetEnvironment() { if (!TryInitializeWebAssembly()) { return false; } try { string result = PrivateMapWebPath(EdmConstants.WebHomeSymbol); return result != null; } catch (Exception e) { if (EntityUtil.IsCatchableExceptionType(e)) { return false; } throw; } } private bool TryInitializeWebAssembly() { // We cannot introduce a hard dependency on the System.Web assembly, so we load // it via reflection. // if (_webAssembly != null) { return true; } else if (_triedLoadingWebAssembly) { return false; } Debug.Assert(_triedLoadingWebAssembly == false); Debug.Assert(_webAssembly == null); _triedLoadingWebAssembly = true; try { _webAssembly = Assembly.Load(AssemblyRef.SystemWeb); return _webAssembly != null; } catch (Exception e) { if (!EntityUtil.IsCatchableExceptionType(e)) { throw; // StackOverflow, OutOfMemory, ... } // It is possible that we are operating in an environment where // System.Web is simply not available (for instance, inside SQL // Server). Instead of throwing or rethrowing, we simply fail // gracefully } return false; } void InitializeWebAssembly() { if (!TryInitializeWebAssembly()) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.UnableToDetermineApplicationContext); } } ////// This method accepts a string parameter that represents a path in a Web (specifically, /// an ASP.NET) application -- one that starts with a '~' -- and resolves it to a /// canonical file path. /// ////// The implementation assumes that you cannot have file names that begin with the '~' /// character. (This is a pretty reasonable assumption.) Additionally, the method does not /// test for the existence of a directory or file resource after resolving the path. /// internal string MapWebPath(string path) { Debug.Assert(path != null, "path == null"); path = PrivateMapWebPath(path); if (path == null) { string errMsg = Strings.InvalidUseOfWebPath(EdmConstants.WebHomeSymbol); throw EntityUtil.InvalidOperation(errMsg); } return path; } private string PrivateMapWebPath(string path) { Debug.Assert(!string.IsNullOrEmpty(path)); Debug.Assert(path.StartsWith(EdmConstants.WebHomeSymbol, StringComparison.Ordinal)); InitializeWebAssembly(); // Each managed application domain contains a static instance of the HostingEnvironment class, which // provides access to application-management functions and application services. We'll try to invoke // the static method MapPath() on that object. // try { Type hostingEnvType = _webAssembly.GetType("System.Web.Hosting.HostingEnvironment", true); MethodInfo miMapPath = hostingEnvType.GetMethod("MapPath"); Debug.Assert(miMapPath != null, "Unpexpected missing member in type System.Web.Hosting.HostingEnvironment"); // Note: // 1. If path is null, then the MapPath() method returns the full physical path to the directory // containing the current application. // 2. Any attempt to navigate out of the application directory (using "../..") will generate // a (wrapped) System.Web.HttpException under ASP.NET (which we catch and re-throw). // return (string)miMapPath.Invoke(null, new object[] { path }); } catch (TargetException e) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.UnableToDetermineApplicationContext, e); } catch (ArgumentException e) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.UnableToDetermineApplicationContext, e); } catch (TargetInvocationException e) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.UnableToDetermineApplicationContext, e); } catch (TargetParameterCountException e) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.UnableToDetermineApplicationContext, e); } catch (MethodAccessException e) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.UnableToDetermineApplicationContext, e); } catch (MemberAccessException e) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.UnableToDetermineApplicationContext, e); } catch (TypeLoadException e) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.UnableToDetermineApplicationContext, e); } } internal bool HasBuildManagerType() { Type buildManager; return TryGetBuildManagerType(out buildManager); } private bool TryGetBuildManagerType(out Type buildManager) { InitializeWebAssembly(); buildManager = _webAssembly.GetType(BUILD_MANAGER_TYPE_NAME, false); return buildManager != null; } internal IEnumerable GetBuildManagerReferencedAssemblies() { // We are interested in invoking the following method on the class // System.Web.Compilation.BuildManager, which is available only in Orcas: // // public static ICollection GetReferencedAssemblies(); // Type buildManager; if (!TryGetBuildManagerType(out buildManager)) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.UnableToFindReflectedType(BUILD_MANAGER_TYPE_NAME, AssemblyRef.SystemWeb)); } MethodInfo getRefAssembliesMethod = buildManager.GetMethod( @"GetReferencedAssemblies", BindingFlags.InvokeMethod | BindingFlags.Static | BindingFlags.Public ); if (getRefAssembliesMethod == null) { // eat this problem return new List (); } ICollection referencedAssemblies = null; try { referencedAssemblies = (ICollection)getRefAssembliesMethod.Invoke(null, null); if (referencedAssemblies == null) { return new List (); } return referencedAssemblies.Cast (); } catch (TargetException e) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.UnableToDetermineApplicationContext, e); } catch (TargetInvocationException e) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.UnableToDetermineApplicationContext, e); } catch (MethodAccessException e) { throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.UnableToDetermineApplicationContext, e); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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