如何在不同的文件夹C#中加载程序集

时间:2016-08-26 16:25:36

标签: c# .net dll .net-assembly

我需要加载DLL和依赖项。在我的数据库中,我已经保存了所有依赖项(引用文件的路径)。

即:

要加载的DLL:

  • id:1
  • 名: “DummyModule.dll”

依赖关系:

  • DLL id:1
  • 路径:“C:\ DLL \ ABC.dll”

AssemblyLoader类:

public class AssemblyLoader : MarshalByRefObject
{
    public void Load(string path)
    {
        ValidatePath(path);

        Assembly.Load(path);
    }

    public void LoadFrom(string path)
    {
        ValidatePath(path);

        Assembly.LoadFrom(path);
    }

    public void LoadBytes(string path)
    {
        ValidatePath(path);

        var b = File.ReadAllBytes(path);

        Assembly.Load(b);
    }

    public Assembly GetAssembly(string assemblyPath)
    {
        try
        {
            return Assembly.Load(assemblyPath);
        }
        catch (Exception ex)
        {
            throw new InvalidOperationException(ex.Message);
        }
    }

    public Assembly GetAssemblyBytes(string assemblyPath)
    {
        try
        {
            var b = File.ReadAllBytes(assemblyPath);

            return Assembly.Load(b);
        }
        catch (Exception ex)
        {
            throw new InvalidOperationException(ex.Message);
        }
    }

    private void ValidatePath(string path)
    {
        if (path == null)
            throw new ArgumentNullException("path");

        if (!File.Exists(path))
            throw new ArgumentException(String.Format("path \"{0}\" does not exist", path));
    }
}

主要班级:

    static void Main(string[] args)
    {
        string file1 = @"1\DummyModule.dll";
        string file2 = @"2\PSLData.dll";
        string file3 = @"3\Security.dll";

        try
        {
            AppDomain myDomain = AppDomain.CreateDomain("MyDomain");

            var assemblyLoader = (AssemblyLoader)myDomain.CreateInstanceAndUnwrap(typeof(AssemblyLoader).Assembly.FullName, typeof(AssemblyLoader).FullName);

            assemblyLoader.LoadBytes(file2);
            assemblyLoader.LoadBytes(file3);

            var dummy = assemblyLoader.GetAssemblyBytes(file1);

            foreach (var t in dummy.GetTypes())
            {
                var methodInfo = t.GetMethod("D");
                if (methodInfo != null)
                {
                    var obj = Activator.CreateInstance(t);
                    Console.Write(methodInfo.Invoke(obj, new object[] { }).ToString());
                }
            }

            AppDomain.Unload(myDomain);
        }
        catch (Exception ex)
        {
            Console.Write(ex.Message);
        }

        Console.ReadKey();
    }

在上面的代码中,“DummyModule.dll”是主dll,“PSLData.dll”和“Security.dll”是依赖项。

当我调用“DummyModule.dll”的方法“D”时,会出现错误:

Could not load file or assembly 'DummyModule, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.

所有DLL文件仍在不同的文件夹中。如何加载所有需要的文件并调用函数?

感谢。

2 个答案:

答案 0 :(得分:0)

尝试使用它..它对我有用..

serviceAgentAssembly =System.Reflection.Assembly.LoadFrom(string.Format(CultureInfo.InvariantCulture, @"{0}\{1}", assemblyPath, assemblyName));

foreach (Type objType in serviceAgentAssembly.GetTypes())
{
  //further loops to get the method
  //your code to ivoke the function
}

答案 1 :(得分:0)

你正在使用程序集的相对路径,所以问题是“相对于什么?”您创建并加载程序集的新AppDomain在树林中丢失;它不会继承您在其中创建它的AppDomain的相同探测路径。查看类 System.AppDomainSetup 及其属性 ApplicationBase PrivateBinPath 以及采用实例的CreateDomain()形式AppDomainSetup作为参数。最简单的解决方案是使用由 AppDomain.CurrentDomain.SetupInformation 返回的AppDomainSetup实例,当前域当然是创建新域的应用程序。