appdomain 动态加载卸载dll时的问题

Question

       

代码如下，

当执行到 下面这句时提示错误：未能加载文件或程序集“test1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null”或它的某一个依赖项。系统找不到指定的文件。

其中test1.dll,test2.dll都放在 APP\dllsDir\

测试过，test1.dll不引用test2.dll，也出现如上错误。

谢谢！！！

Assembly ass = ad.Load(buffer);

static void Main(string[] args)
{
            //要动态加载的dll
            string dll = AppDomain.CurrentDomain.BaseDirectory + "\\dllsDir\\test1.dll";

            AppDomainSetup setup = new AppDomainSetup();
            setup.ApplicationName = "setup" + Guid.NewGuid().ToString().Replace("-", "");
            setup.ApplicationBase = System.Environment.CurrentDirectory;
            setup.PrivateBinPath =“dllsDir”;
            setup.DisallowBindingRedirects = false;
            setup.DisallowCodeDownload = true;
            setup.CachePath = setup.ApplicationBase;
            setup.ConfigurationFile = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;

            //创建一个新域
            
            AppDomain ad = AppDomain.CreateDomain(setup.ApplicationName, AppDomain.CurrentDomain.Evidence, setup);
            
            FileStream fs = new FileStream(AppDomain.CurrentDomain.BaseDirectory + "\\dllsDir\\test1.dll", FileMode.Open);
            byte[] buffer = new byte[(int)fs.Length];
            fs.Read(buffer, 0, buffer.Length);
            fs.Close();

            //当运行到这里时提示：
/*
未能加载文件或程序集“test1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null”或它的某一个依赖项。系统找不到指定的文件。
*/
            Assembly ass = ad.Load(buffer);


            Type type = ass.GetType("test1.Class1");
            object instance = ass.CreateInstance("test1.Class1");
            MethodInfo mi = type.GetMethod("set");
            //执行DLL方法
            value = mi.Invoke(instance, new object[] { "123456" });
            AppDomain.Unload(ad);


            Console.WriteLine(value.ToString());
            Console.ReadKey();
}



//test1.dll
namespace test1
{
    [Serializable]
    public class Class1 : test2.IClass1
    {
        public string set(string name)
        {
            return "test1.Class1." + name;
        }
    }
}
//test2.dll
namespace test2
{
    public interface IClass1
    {
        string set(string name);
    }
}

---

dog

Answer 1

需要hook一下AssemblyResolve事件

https://docs.microsoft.com/en-us/dotnet/framework/app-domains/resolve-assembly-loads

using System;
using System.Reflection;

class BadExample
{
    static void Main()
    {
        AppDomain ad = AppDomain.CreateDomain("Test");
        ad.AssemblyResolve += MyHandler;

        try
        {
            object obj = ad.CreateInstanceAndUnwrap(
                "MyAssembly, version=1.2.3.4, culture=neutral, publicKeyToken=null",
                "MyType");
        } 
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }

    static Assembly MyHandler(object source, ResolveEventArgs e) 
    {
        Console.WriteLine("Resolving {0}", e.Name);
        return Assembly.Load(e.Name);
    }
} 
在MyHandler方法中将Assembly.Load改为LoadFrom()，参数为test1.dll所在路径和程序集名称。

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