动态加载具有某些其他dll依赖项的.NET程序集

问题描述

我想为我的应用程序创建一个插件引擎，但是我遇到一个问题:如何加载对其他程序集有依赖性的.Net程序集(实际上是我的插件).

I want to create a plugin engine for my app, but I have a problem: How can I load a .Net assembly (Actually my plugin) which has some dependency to other assembly.

例如，我要加载A.DLL，而A.DLL需要加载B.dll或C.dll等，然后运行. A.dll具有两种方法，例如A()和B().而A()或B()使用B.dll或C.dll的某种方法.

For example I want to load A.DLL and A.DLL need to B.dll or C.dll and so on to run. The A.dll has two method such as A() and B(). And A() or B() use some method of B.dll or C.dll.

如何动态加载A.DLL并调用A()或B()?

What should I do to dynamically load A.DLL and call A() or B()?

推荐答案

在当前AppDomain中使用AssemblyResolve事件:

Use AssemblyResolve event in the current AppDomain:

要加载DLL:

string[] dlls = { @"path1\a.dll", @"path2\b.dll" };
foreach (string dll in dlls)
{
    using (FileStream dllFileStream = new FileStream(dll, FileMode.Open, FileAccess.Read))
    {
         BinaryReader asmReader = new BinaryReader(dllFileStream);
         byte[] asmBytes = asmReader.ReadBytes((int)dllFileStream.Length);
         AppDomain.CurrentDomain.Load(asmBytes);
    }
}
// attach an event handler to manage the assembly loading
AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_AssemblyResolve;

事件处理程序检查程序集的名称并返回正确的名称:

The event handler checks for the name of the assembly and returns the right one:

private static Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
{
    AppDomain domain = (AppDomain)sender;
    foreach (Assembly asm in domain.GetAssemblies())
    {
        if (asm.FullName == args.Name)
        {
            return asm;
        }
    }
    throw new ApplicationException($"Can't find assembly {args.Name}");
}

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