c# - 从另一个 WPF 应用程序加载 WPF 应用程序程序集，在同一 AppDomain 中获取错误 : Cannot create more than one System. Windows.Application 实例

Question

场景:

LUNCHER.exe:一个 WPF 应用程序 >> Build 32bit, .Net 4.5.1, location= D:\

LOADED.exe:另一个 WPF 应用程序 >> Build 32bit，.Net 4.5.1，location= D:\

我是两个程序集的所有者(应用程序和thair源)

现在，我想将 LOADED.exe [及其资源，例如图像 dll 和...] 作为 Byte array 加载到内存并执行它，然后从硬盘中删除 LOADED.exe 及其资源。

在第一步中，我尝试将 LOADED.exe 文件加载到内存并执行它(所以我在此使用了一个没有任何资源的简单 EXE步骤)。

A)

好的，我为 WinForm 程序找到了这种方式 here :

var filePath = @"D:\LOADED.EXE";

if (File.Exists(filePath))
{
    try
    {

        // prepare to load the application into memory (using Assembly.Load)

        // read the bytes from the application exe file
        var fs = new FileStream(filePath, FileMode.Open);
        var br = new BinaryReader(fs);
        byte[] bin = br.ReadBytes(Convert.ToInt32(fs.Length));
        fs.Close();
        br.Close();

        // load the bytes into Assembly
        var asm = Assembly.Load(bin);
        // search for the Entry Point
        var method = asm.EntryPoint;
        if (method != null)
        {
            // create an istance of the Startup form Main method
            object o = asm.CreateInstance(method.Name);

            // invoke the application starting point
            Application.Current.ShutdownMode = System.Windows.ShutdownMode.OnExplicitShutdown;
            method.Invoke(o, null);
        }
        else
        {
            //show message: Impossible to launch the application 
        }
    }
    catch(Exception ex)
    {
        MessageBox.Show(ex.Message + "\n\r\n\r" + ex.InnerException + "\n\r\n\r" + "\n\r\n\r" + ex.Source);
        // exception throws .. something to do?
    }
}

我在一个按钮下的 LUNCHER.exe 中尝试了它，然后运行...处理异常的结果:

Cannot create more than one System.Windows.Application instance in the same AppDomain.

好的!

---

B)

然后，我搜索了一个解决方案，有人说您必须在 new [different] AppDomain 中执行它。

例如这里是一个答案:Dynamically Loaded Assembly - Settings & Communication

我在 LUNCHER.exe 的另一个按钮下尝试了以下代码:

private void Button_Click_1(object sender, RoutedEventArgs e)
{
    try
    {
        var filePath = string.Format("{0}{1}", Utility.ExePath, PART_PATH);
        AppDomain newappdomain = getAppDomainForAssembly(filePath, "LOADED.exe.domain");
        object loadedexe_object = getInstanceFromAppDomain(ref newappdomain, filePath);

        //If you know the method name to call...
        executeMethod(loadedexe_object.GetType(), "methodname", ref loadedexe_object, null);

        //or get entry point...
        executeMethod(loadedexe_object.GetType(),
            _asm_resolve(filePath).EntryPoint.Name, ref loadedexe_object, null);
    }
    catch (Exception ex)
    {
        var type = "";

        if (ex is ArgumentNullException)
        {
            type = "ArgumentNullException";
        }
        else if (ex is NotSupportedException)
        {
            type = "NotSupportedException";
        }
        else if (ex is AppDomainUnloadedException)
        {
            type = "AppDomainUnloadedException";
        }
        else if (ex is TypeLoadException)
        {
            type = "TypeLoadException";
        }
        else if (ex is MissingMethodException)
        {
            type = "MissingMethodException";
        }
        else if (ex is MethodAccessException)
        {
            type = "MethodAccessException";
        }
        else if (ex is BadImageFormatException)
        {
            type = "BadImageFormatException";
        }
        else if (ex is FileLoadException)
        {
            type = "FileLoadException";
        }

        MessageBox.Show(type + "\n\r\n\r" + ex.Message + "\n\r\n\r" + ex.InnerException + "\n\r\n\r" + ex.Source);
    }
}

private AppDomain getAppDomainForAssembly(string assemblypath, string appdomainname)
{
    //this._assembly_file = AssemblyFile;

    string _assembly_file_name = System.IO.Path.GetFileName(assemblypath);
    string _rootpath = System.IO.Path.GetDirectoryName(assemblypath);

    //this._assembly_class_name = AssemblyClassNameToInstance;
    AppDomainSetup _app_domain_info = new AppDomainSetup();
    _app_domain_info.ApplicationBase = _rootpath;
    _app_domain_info.PrivateBinPath = _rootpath;
    _app_domain_info.PrivateBinPathProbe = _rootpath;
    _app_domain_info.ConfigurationFile = _rootpath + @"LOADED.exe.config";  //Here put the path to the correct .assembly .config file

    AppDomain _app_domain = AppDomain.CreateDomain(appdomainname, null, _app_domain_info);

    return _app_domain;
}

protected System.Reflection.Assembly _asm_resolve(string assemblyFile)
{
    return System.Reflection.Assembly.LoadFrom(assemblyFile);
}

private object getInstanceFromAppDomain(ref AppDomain appDomain,
    string assemblyPath, string className = null)
{
    if (string.IsNullOrEmpty(className))
    {
        System.Reflection.Assembly assembly = _asm_resolve(assemblyPath);
        System.Reflection.MethodInfo method = assembly.EntryPoint;

        // Now my ERROR is in this line>>
        return appDomain.CreateInstanceFromAndUnwrap(assemblyPath, method.Name); 
    }
    else
    {
        return appDomain.CreateInstanceFromAndUnwrap(assemblyPath, className);
    }
}

现在我的错误是在这一行:

好的!

---

C)

我再次搜索并找到了这个 ( Dynamically loaded Assembly not loading in new AppDomain ):

// Provides a means of invoking an assembly in an isolated appdomain
public static class IsolatedInvoker
{
    // main Invoke method
    public static void Invoke(string assemblyFile, string typeName, string methodName, object[] parameters)
    {
        // resolve path
        assemblyFile = Path.Combine(Environment.CurrentDirectory, assemblyFile);
        Debug.Assert(assemblyFile != null);

        // get base path
        var appBasePath = Path.GetDirectoryName(assemblyFile);
        Debug.Assert(appBasePath != null);

        // change current directory
        var oldDirectory = Environment.CurrentDirectory;
        Environment.CurrentDirectory = appBasePath;
        try
        {
            // create new app domain
            var domain = AppDomain.CreateDomain(Guid.NewGuid().ToString(), null, appBasePath, null, false);
            try
            {
                // create instance
                var invoker = (InvokerHelper) domain.CreateInstanceFromAndUnwrap(Assembly.GetExecutingAssembly().Location, typeof(InvokerHelper).FullName);

                // invoke method
                var result = invoker.InvokeHelper(assemblyFile, typeName, methodName, parameters);

                // process result
                Debug.WriteLine(result);
            }
            finally
            {
                // unload app domain
                AppDomain.Unload(domain);
            }
        }
        finally
        {
            // revert current directory
            Environment.CurrentDirectory = oldDirectory;
        }
    }

    // This helper class is instantiated in an isolated app domain
    private class InvokerHelper : MarshalByRefObject
    {
        // This helper function is executed in an isolated app domain
        public object InvokeHelper(string assemblyFile, string typeName, string methodName, object[] parameters)
        {
            // create an instance of the target object
            var handle = Activator.CreateInstanceFrom(assemblyFile, typeName);

            // get the instance of the target object
            var instance = handle.Unwrap();

            // get the type of the target object
            var type = instance.GetType();

            // invoke the method
            var result = type.InvokeMember(methodName, BindingFlags.InvokeMethod | BindingFlags.Public | BindingFlags.Instance, null, instance, parameters);

            // success
            return result;
        }
    }
}

然后我在 LUNCHER.exe 的另一个按钮下通过以下代码调用它:

private void Button_Click_2(object sender, RoutedEventArgs e)
{
    var filePath = string.Format("{0}{1}", Utility.ExePath, PART_PATH);
    IsolatedInvoker.Invoke(filePath, "Main", "Main", new object[] {});
}

但是我得到了和以前一样的错误 **B**:

An unhandled exception of type 'System.TypeLoadException' occurred in Luncher.exe

Additional information: Could not load type 'Main' from assembly Loaded, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.

---

D)

我还在 LUNCHER.EXE 中的另一个按钮下以这种方式进行了测试:

private void Button_Click_3(object sender, RoutedEventArgs e)
{
    var filePath = @"D:\LOADED.exe";
    var dll = File.ReadAllBytes(filePath);
    var assembly = Assembly.Load(dll);

    var app = typeof (Application);

    var field = app.GetField("_resourceAssembly", BindingFlags.NonPublic | BindingFlags.Static);
    field.SetValue(null, assembly);

    //fix urihelper
    var helper = typeof (BaseUriHelper);
    var property = helper.GetProperty("ResourceAssembly", BindingFlags.NonPublic | BindingFlags.Static);
    property.SetValue(null, assembly, null);

    //---- Now my ERROR is in this line >>
    assembly.EntryPoint.Invoke(null, new object[] {});
}

运行时最后一行代码错误:

An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in mscorlib.dll

Additional information: Exception has been thrown by the target of an invocation.

---

最后:

我很困惑!

• 我在上述所有方法中的错误是什么？
• 为什么所有的方法都以错误结尾!!!

请用简单的描述和一些代码帮助我，因为我在这种情况下是初学者(加载程序集，创建 AppDomain 和......)但我需要将 WPF 应用程序加载到内存中并且显示它的窗口，然后在它在内存中运行时从 H.D.D 中删除它的文件。

Answer 1

1. 创建一个共享程序集。这将加载到两个 AppDomains(“Launcher”域、“Loaded”域)并作为我们“Loaded”AppDomain 的入口点:

   添加新项目 > 类库 > 名称:ChildDomainLoader

   在新项目中添加以下引用:System.Xaml、WindowsBase、PresentationFramework

   在您的 Launcher 项目中为 ChildDomainLoader 添加项目引用。 Loaded 项目无需修改。

2. 向共享程序集添加一些代码。我们需要一个可以跨域调用并加载我们的子程序集的 MarshalByRefObject。我们称它为 Runner:

   using System;
   using System.IO;
   using System.Linq;
   using System.Reflection;
   using System.Windows;
   
   namespace ChildDomainLoader
   {
       public class Runner : MarshalByRefObject
       {
           public static AppDomain RunInOtherDomain(string assemblyPath)
           {
               var ownType = typeof (Runner);
               string ownAssemblyName = ownType.Assembly.FullName;
   
               // Create a new AppDomain and load our assembly in there.
               var childDomain = AppDomain.CreateDomain(Guid.NewGuid().ToString());
               childDomain.Load(ownAssemblyName);
   
               // Call Run() in other AppDomain.
               var runner = (Runner) childDomain.CreateInstanceAndUnwrap(ownAssemblyName, ownType.FullName);
               runner.Run(assemblyPath);
   
               return childDomain;
           }
   
           public void Run(string assemblyPath)
           {
               // We load the assembly as byte array.
               var otherAssemblyBytes = File.ReadAllBytes(assemblyPath);
               var assembly = AppDomain.CurrentDomain.Load(otherAssemblyBytes);
   
               AppDomain.CurrentDomain.AssemblyResolve += (sender, args) =>
               {
                   throw new NotImplementedException("Probably need to do some work here if you depend on other assemblies.");
               };
   
               // Set the assembly as ResourceAssembly, as WPF will be confused otherwise.
               Application.ResourceAssembly = assembly;
   
               // Search for the App class.
               var app = assembly
                   .GetExportedTypes()
                   .Single(t => typeof(Application).IsAssignableFrom(t));
   
               // Invoke its Main method.
               MethodInfo main = app.GetMethod("Main", BindingFlags.Static | BindingFlags.Public);
               main.Invoke(null, null);
           }
       }
   }
   

3. 使用它。从您的 Launcher 应用程序调用 Runner.RunInOtherDomain。

   var assemblyPath = "path to your loaded.exe";
   ChildDomainLoader.Runner.RunInOtherDomain(assemblyPath);
   File.Delete(assemblyPath);