c# – 加载多个版本的DLL

// constructor called from a static constructor elsewhere
MyDllLoader(string hardwareFolder) {
    _hardwareFolder = hardwareFolder;
    AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler(CurrentDomain_AssemblyResolve);
    SeeIfAlreadyLoaded();
}


private void SeeIfAlreadyLoaded() {
    // if the assembly is still in the current app domain then the AssemblyResolve event will
    // never fire.
    // Since we need to know where the assembly is,we have to look for it
    // here.
    Assembly[] assems = AppDomain.CurrentDomain.GetAssemblies();
    foreach (Assembly am in assems)
    {
        // if it matches,just mark the local _loaded as true and get as much
        // other information as you need
    }
}

System.Reflection.Assembly CurrentDomain_AssemblyResolve(object sender,ResolveEventArgs args) {
    string name = args.Name;
    if (name.StartsWith("Intermediate.dll,"))
    {
        string candidatePath = Path.Combine(_hardwareFolder,"Intermediate.dll");
        try {
            Assembly assem = Assembly.LoadFrom(candidatePath);
            if (assem != null) {
                _location = candidateFolder;
                _fullPath = candidatePath;
                _loaded = true;
                return assem;
            }
        }
        catch (Exception err) {
            sb.Append(err.Message);
        }
    }
    return null;
}

还有另一个解决方案 – 它很复杂,但我已经完成了它并为你完成了工作.您声明了一个抽象类,比如说MyHardwareAbstraction,它具有您想要的方法的签名,并且您可以针对该接口进行编码.然后编写一些代码,这些代码给出了程序集的路径,加载它并动态定义一个匹配MyHardwareAbstraction的新类,并使其映射到您想要的实际对象的实例上. I wrote a blog several years ago on how to do this.

执行此操作的好处是您在代码中使用抽象类型并对其进行操作,然后适配器编译器将在运行时编译一个新类,该类将使用其他类型作为目标类型来完成该抽象类型.它也很有效率.