动态加载具有其他一些 dll 依赖项的 .NET 程序集 [英] Dynamic load a .NET assembly with some other dll dependency

问题描述

我想为我的应用程序创建一个插件引擎，但我遇到了一个问题:如何加载对其他程序集有一定依赖性的 .Net 程序集(实际上是我的插件).

例如我要加载A.DLL 和A.DLL 需要B.dll 或C.dll 等运行.A.dll 有两个方法，例如A() 和B().而A() 或B() 使用了B.dll 或C.dll 的一些方法.

如何动态加载A.DLL并调用A()或B()?

解决方案

在当前 AppDomain 中使用 AssemblyResolve 事件:

加载 DLL:

string[] dlls = { @"path1a.dll", @"path2.dll" };foreach(dll 中的字符串 dll){使用 (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);}}//附加一个事件处理程序来管理程序集加载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:

private static Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args){AppDomain 域 = (AppDomain)sender;foreach(在domain.GetAssemblies() 中组装asm){如果(asm.FullName == args.Name){返回汇编；}}throw new ApplicationException($"找不到程序集{args.Name}");}

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.

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.

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

解决方案

Use AssemblyResolve event in the current AppDomain:

To load DLLs:

string[] dlls = { @"path1a.dll", @"path2.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;

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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