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;
}