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使用ApplicationHost.CreateApplicationHost()创建Asp.Net post,同时从其他位置加载程序集

applicationhost asp.net

4

Justin · 技术社区 · 16 年前

我试着用 CreateApplicationHost System.IO.FileNotFoundException 当它试图创建编组对象的实例时:

host = (MyMarshaller)ApplicationHost.CreateApplicationHost((MyMarshaller), virtualDir, physicalDir);

我相信这个错误是因为它找不到包含类MyMarshaller的程序集-如果我把这个程序集放在physicalDir的bin目录中,那么一切都正常,但是我不想这样做(我也不想把我的程序集放在GAC中)。

MyMarshaller 类与上述代码行位于同一程序集中)

2 回复 | 直到 16 年前

1

5

Justin 13 年前

简而言之,这是不可能做到的,但是 Cassini 消息人士透露了另一种解决方案。

CassiniDev project 在CodePlex上似乎非常接近(可能是一个衍生作品),并且包含相同的解决方案。

解决方法是避免使用 CreateApplicationHost 而是“自己动手”——在本例中,使用反射创建内部“BuildManagerHost”类型的实例并调用“RegisterAssembly”,如下所示

/// <remarks>
/// This is Dmitry's hack to enable running outside of GAC.
/// There are some errors being thrown when running in proc
/// </remarks>
private object CreateWorkerAppDomainWithHost(string virtualPath, string physicalPath, Type hostType,int port)
{
    // create BuildManagerHost in the worker app domain
    //ApplicationManager appManager = ApplicationManager.GetApplicationManager();
    Type buildManagerHostType = typeof(HttpRuntime).Assembly.GetType("System.Web.Compilation.BuildManagerHost");
    IRegisteredObject buildManagerHost = ApplicationManager.CreateObject(_appId, buildManagerHostType, virtualPath,
                                                                  physicalPath, false);

    // call BuildManagerHost.RegisterAssembly to make Host type loadable in the worker app domain
    buildManagerHostType.InvokeMember("RegisterAssembly",
                                      BindingFlags.Instance | BindingFlags.InvokeMethod | BindingFlags.NonPublic,
                                      null,
                                      buildManagerHost,
                                      new object[] { hostType.Assembly.FullName, hostType.Assembly.Location });

    // create Host in the worker app domain
    // FIXME: getting FileLoadException Could not load file or assembly 'WebDev.WebServer20, Version=4.0.1.6, Culture=neutral, PublicKeyToken=f7f6e0b4240c7c27' or one of its dependencies. Failed to grant permission to execute. (Exception from HRESULT: 0x80131418)
    // when running dnoa 3.4 samples - webdev is registering trust somewhere that we are not
    return ApplicationManager.CreateObject(_appId, hostType, virtualPath, physicalPath, false);
}