是否有对热插拔的.N​​ET参考实现？ [英] Are there reference implementations of hot-swapping in .NET?

问题描述

我在寻找一个好的实现热插拔.NET中完成的。我需要的东西是：

I'm looking for a good implementation of hot-swapping done in .NET. The things I need are:

• 如果能够在一个特定的文件夹将部署DLL，有一个正在运行的系统接他们回家。
• 在具有相应的容器引用正在运行的系统更新。

我一直在寻找到MEF和其目录加载机制，但似乎非常不可靠。也许有人在那里有一个可选的实现？

I've been looking into MEF and its directory loading mechanism, but it seems very unreliable. Maybe someone out there has an alternative implementation?

推荐答案

您可以通过调用newAppDomain提供（）以下的自定义事件处理程序AssemblyResolve。提供您的目录中，这样的AppDomain看起来那里。当加载一个类型，使用功能loadFromAppDomain（）返回它。这应该允许您复制新的DLL到C：\ dll文件在运行时，并从那里重新加载。 （请原谅我，我根据自己的标记从我的VB源到C＃翻译这一点。）

You can provide a custom event handler for AssemblyResolve by calling newAppDomain() below. Supply your directory so AppDomain looks there. When loading a Type, use function loadFromAppDomain() to return it. This should allow you to copy new dlls to C:\dlls at runtime and reload from there. (Forgive me, I translated this from my VB source to C# according to your tag.)

String dllFolder = "C:\\dlls";

public void newAppDomain()
{
    AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler(assemblyResolve);
}

private static Assembly assemblyResolve(Object sender, ResolveEventArgs args){
    String assemblyPath = Path.Combine(dllFolder, new AssemblyName(args.Name).Name + ".dll");
    if(!File.Exists(assemblyPath))
    {
        return null;
    }
    else
    {
        return Assembly.LoadFrom(assemblyPath);
    }
}

private Type loadFromAppDomain(String className)
{
    Assembly[] asses = AppDomain.CurrentDomain.GetAssemblies();
    List<Type> types = new List<Type>();
    foreach(Assembly ass in asses)
    {
        Type t = ass.GetType(className);
        if(t != null) types.Add(t);
    }
    if(types.Count == 1)
        return types.First();
    else
        return null;
}

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