c# - C# 中的 BadImageFormatException。预计包含 list

Question

我一直在使用 VS2013 Native Tools Command Prompt 测试一些东西。

到目前为止，我无法让代码加载我制作的 dll。

这是我的 dll 代码，用 c 编写。 (基于msdn示例)

int __declspec(dllexport) SampleMethod(int i){return i*-10;} 

并在VS2013 Native Tools中用cl/LD编译它。

然后我在 VS2013 Native Tools 中使用 csc 编译了我的 C# 代码。

public class MainClass
{
    static void Main(string[] args)
    {
        Assembly assembly;
        try
        {
            assembly = Assembly.Load(args[0]);
            Console.WriteLine("Loaded dll");
        }
        catch (Exception e)
        {
            Console.WriteLine("Exception caught : \n{0}.", e);
        }
    }    
}

捕获的异常如下:

Exception caught :
System.BadImageFormatException: Could not load file or assembly 'test' or one of
 its dependencies. The module was expected to contain an assembly manifest.
File name: 'test'
   at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String cod
eBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark&
stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntro
spection, Boolean suppressSecurityChecks)
   at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName as
semblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMar
k& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIn
trospection, Boolean suppressSecurityChecks)
   at System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evid
ence assemblySecurity, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolea
n forIntrospection)
   at System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evid
ence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
   at System.Reflection.Assembly.Load(String assemblyString)
   at MainClass.Main(String[] args)

我已经尝试过 x86 和 x64 工具，但现在我没有主意了。

Answer 1

Assembly.Load 只能加载托管 (.NET) 程序集。您尝试加载 native DLL，从而产生错误。

相反，您想使用 P/Invoke。这仅适用于普通的 C 风格方法，如果您需要使用例如C++类，需要先制作一个互操作库。

您的案例的 P/Invoke 方法的签名如下所示:

[DllImport("test.dll")]
public static extern int SampleMethod(int i);