在 C# 代码中使用参数调用 matlab 方法

Question

我试图在我的 C# 代码中使用参数调用 matlab 方法。我使用反射在运行时将带有 matlab 函数的 dll 加载到我的应用程序中，效果很好：

Assembly matlabAssembly = Assembly.LoadFrom(info.FullName);

List<Type> types = new List<Type>();

types = matlabAssembly.GetTypes().ToList();

List<MethodInfo> methods = new List<MethodInfo>();
methods.AddRange(types[0].GetMethods());

dynamic dynamicObject = Activator.CreateInstance(types[0]);

dll包含一种类型和一种功能：

MWArray MyMatlabFunction(MWArray, MWArray, MWArray, MWArray);

我创建了几个数组并希望将它们作为参数传递给这个函数。为了使 MWArray 类型在编译时可用于 C#，我将 Matlab 运行时中的程序集“MWArray.dll”静态添加到我的项目中。

MWArray array1 = new MWNumericArray(120);
MWArray array2 = new MWNumericArray(100);
MWArray array3 = new MWNumericArray(15);
MWArray array4 = new MWLogicalArray(true);
object[] params = new object[] {array1, array2, array3, array4};

MethodInfo matlabFuncion = methods[5]; //MyMatlabFunction

matlabFunction.Invoke(dynamicObject, params);

当我调用调用方法时，我得到一个异常，即 MWNummericArray 无法转换为 MWArray 尽管 MWNummericArray 直接派生自 MWArray。我错过了什么还是我做错了？

Answer 1

如果有人偶然发现同样的问题，这里是我找到的解决方案：

当您想在您的 C# 应用程序中运行 Matlab 代码时，您需要从 Matlab 运行时引用“MWArray.dll”。但是，如果您将此 dll 的引用静态添加到您的项目中，它将无法正常工作，因为无法加载该引用。

解决方案是通过反射加载对“MWArray”的引用并动态创建实例到“MWArray”。

public void Foo()
{
    AppDomain currentDomain = AppDomain.CurrentDomain;
    currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);

    // Load dll which was exported from Matlab into application
    string path = @"..\..\..\..\MatlabDlls\Matlab-Integration";
    string dllName = "MyExportedMatlabDLL.dll";
    List<string> dllPaths = Directory.GetFiles(path).Where(file => file.EndsWith(dllName)).ToList();

    FileInfo info = new FileInfo(dllPaths[0]);
    Assembly matlabAssembly = Assembly.LoadFrom(info.FullName);

    // Get types from exported dll
    List<Type> exportedMatlabTypes = new List<Type>();
    exportedMatlabTypes = matlabAssembly.GetTypes().ToList();

    List<MethodInfo> methods = new List<MethodInfo>();
    methods.AddRange(exportedMatlabTypes[0].GetMethods());

    // Create instance of exported Matlabtype 
    dynamic dynamicObject = Activator.CreateInstance(exportedMatlabTypes[0]);

    // Select MWArray from loaded Assemblies
    // Important: MWArray could only be loaded into the application with
    // the ResolveEventHandler further below
    Assembly mwArrayAssembly = AppDomain.CurrentDomain.GetAssemblies().Where(name => name.FullName.Contains("MWArray")).ToList()[0];

    // Get all available types of MWArray
    List<Type> MWArrayTypes = mwArrayAssembly.GetTypes().ToList();                          

    // Create some MWArrays
    // MWNummericArray
    dynamic array1 = Activator.CreateInstance(MWArrayTypes[9], new object[] { new byte[640 * 480]});
    //MWNummericArray
    dynamic array2 = Activator.CreateInstance(MWArrayTypes[9], new object[] { 100 });
    //MWLogicalArray
    dynamic array3 = Activator.CreateInstance(MWArrayTypes[5], new object[] { true });

    // Parameters for Matlab function 
    object[] params= new object[] { array1, array2, array3};

    MethodInfo matlabFuncion = methods[5];      
    var result = matlabFuncion.Invoke(dynamicObject, params);
}

// The ResolveEventHandler ensures the proper loading of dependent assemblies
// I wrote a crawler that would search inside the Matlab runtime for dependent 
// assemblies. It is enough to just load "MWArray" from a static path... 
private Assembly MyResolveEventHandler(object sender, ResolveEventArgs args)
{
    Assembly dependentAssembly = null;
    string assemblyName = args.Name.Split(',')[0];
    string assemblypath = _crawler.getFullName(_runtimepath, assemblyName);
    if (assemblypath != string.Empty)
        dependentAssembly = Assembly.LoadFile(assemblypath);
    return dependentAssembly;
}