msbuild中的反射问题,devenv很好

时间:2012-02-02 05:30:25

标签: msbuild system.reflection

我已经完成了与此相关的所有问题,并且找不到任何问题,因此,我在问这个问题。

我有一个构建任务(添加为AfterBuild目标),以验证类型名称。这些类型名称是正在构建的silverlight项目中的完全限定类型名称。

要解析这些类型名称,请使用Type.ReflectionOnlyGetType()。要加载从属程序集,我处理AppDomain.CurrentDomain.ReflectionOnlyAssemblyResolve事件以使用Assembly.ReflectionOnlyLoadFrom(filepath)从Silverlight安装路径加载项目输出路径和silverlight基础程序集中的项目特定程序集。

当我在VS2010中构建项目时,这非常正常,但是当我使用MSBuild构建时失败,即C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\msbuild.exe "C:\Root\branches\x.x.x\clients.sln" /t:rebuild /p:Configuration=Debug "/p:Platform=Any CPU" /v:quiet /maxcpucount:1

使用MSBuild构建时,会为ReflectionOnlyAssemblyResolve触发"System, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e"事件,并且这是从silverlight安装路径加载的。但是,探测是在"C:/WINDOWS/Microsoft.NET/Framework/v4.0.30319/System.DLL"中尝试这个系统程序集,由于主要版本不匹配而失败。

以下是我的代码的剥离版本,特定于此问题:

  public class ValidateTypeTask : Task
  {
       public override bool Execute()
       {
            Initialize();

            List<string> typeNames = GetTypes();
            foreach (var typeName in typeNames)
            {
                var isResolved = IsResolvable(typeName);
                if (!isResolved)
                {
                    return false;
                }
            }

            CleanUp();

            return true;
        }

        private void Initialize()
        {
            AppDomain.CurrentDomain.ReflectionOnlyAssemblyResolve += new ResolveEventHandler(CurrentDomain_ReflectionOnlyAssemblyResolve);
        }

        Assembly CurrentDomain_ReflectionOnlyAssemblyResolve(object sender, ResolveEventArgs args)
        {
            Assembly loadedAssembly = null;
            Exception loadedException = null;
            try
            {
                loadedAssembly = Assembly.ReflectionOnlyLoad(args.Name);//this will fail always
            }
            catch (Exception ex)
            {
                loadedException = ex;
            }

            if (loadedAssembly != null)
            {
                return loadedAssembly;
            }

            string assemblyPath = string.Empty;
            var assemblyName = new AssemblyName(args.Name);
            if (args.Name.StartsWith("System"))
            {
                assemblyPath = @"c:\Program Files\Reference Assemblies\Microsoft\Framework\Silverlight\v4.0";
            }
            else
            {
                assemblyPath = @"C:\Root\branches\x.x.x\bin\debug";
            }
            assemblyPath = string.Format(@"{0}\{1}.dll", assemblyPath, assemblyName.Name);
            if (File.Exists(assemblyPath))
            {
                loadedAssembly = Assembly.ReflectionOnlyLoadFrom(assemblyPath);
            }

            if (loadedAssembly == null)
            {
                throw loadedException;
            }

            return loadedAssembly;
        }
        private void CleanUp()
        {
            AppDomain.CurrentDomain.ReflectionOnlyAssemblyResolve -= new ResolveEventHandler(CurrentDomain_ReflectionOnlyAssemblyResolve);
        }
        private List<string> GetTypes()
        {
            return new List<string>();
        }
        private bool IsResolvable(string typeName)
        {
            Type resolvedType = null;
            try
            {
                resolvedType = Type.ReflectionOnlyGetType(typeName, true, true);
            }
            catch (Exception ex)
            {
            }

            if (resolvedType != null)
            {
                return true;
            }

            return false;
        }
    }

我得到的例外情况如下:

  System.IO.FileLoadException: Could not load file or assembly 'System, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
  File name: 'System, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e'
  at System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMarkHandle stackMark, Boolean loadTypeFromPartialName, ObjectHandleOnStack type)
  at System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark, Boolean loadTypeFromPartialName)
  at System.RuntimeType.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark)
  at System.Type.ReflectionOnlyGetType(String typeName, Boolean throwIfNotFound, Boolean ignoreCase)
  at  in c:\root\x.xx.x\BuildTasks\ValidateTypesTask.cs line xxx

  Assembly manager loaded from:  C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\clr.dll
  Running under executable  C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\msbuild.exe
  --- A detailed error log follows. 

  === Pre-bind state information ===
  LOG: User = domain\username
  LOG: DisplayName = System, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
  (Fully-specified)
  LOG: Appbase = file:///C:/WINDOWS/Microsoft.NET/Framework/v4.0.30319/
  LOG: Initial PrivatePath = NULL
  Calling assembly : (Unknown).
  ===
  LOG: This is an inspection only bind.
  LOG: Using application configuration file: C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\msbuild.exe.Config
  LOG: Using host configuration file: 
  LOG: Using machine configuration file from C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\config\machine.config.
  LOG: Attempting download of new URL file:///C:/WINDOWS/Microsoft.NET/Framework/v4.0.30319/System.DLL.
  WRN: Comparing the assembly name resulted in the mismatch: Major Version
  ERR: Failed to complete setup of assembly (hr = 0x80131040). Probing terminated.

我还尝试将silverlight程序集路径包含到AssemblySearchPaths项目属性中,以使其成为探测URL的一部分,并且仍然是相同的。

2 个答案:

答案 0 :(得分:1)

我确信这不是我上面发布的问题的答案。但是,这就是我解决它的方式。

我浏览过论坛和文档,发现了DEVENV和MSBUILD之间的基本区别。使用MSBuild进行构建时,装配分辨率的严格程度与Devenv相同。

另外,我已经完成了Assembly.LoadFromAssembly.ReflectionOnlyLoadFrom之间的区别。 Assembly.RefelectionOnlyLoadFrom仅考虑文件名,不检查版本等。这是MSBuild从.Net 4.0堆栈加载System.dll的地方,因为它必须从silverlight安装路径加载System.dll。

考虑到所有这些,我尝试使用Assembly.LoadFrom加载程序集并使用Type.GetType来解析类型。这次,我遇到了StackOverflowException,因为所有已加载的程序集都会重复触发AssemblyResolve事件。

这时我想到将程序集加载到一个单独的appdomain中,这样我也可以卸载已加载的程序集。我发现this文章非常有用,并遵循类似的模式来解决问题。

虽然我手头已经解决了问题,但我不想为这个答案获得积分。我仍然觉得我没有为MSBuild的问题提供答案。

希望这可能对其他人有所帮助。

答案 1 :(得分:0)

考虑使用AppDomainIsolatedTask作为基类,然后重试。这使得处理程序集更容易,因为程序集不会加载到msbuild AppDomain中。

这也将您的事件调用隔离到您自己的AppDomain。所以MsBuild也不能打扰你。