C# 动态加载程序集dll (实现接口)

一、程序集（接口程序集）：LyhInterface.Dll

namespace LyhInterface
{
public interface ILyhInterface
{
void Run();
}
}

二、程序集（实现接口的程序集）：LyhClassLibrary1.dll， LyhClassLibrary2.dll，LyhClassLibrary3.dll，所有程序集引用：LyhInterface.dll

namespace LyhClassLibrary1
{
public class LyhClass : LyhInterface.ILyhInterface
{
public void Run()
{
throw new Exception(this.GetType().ToString());
}
}
}

namespace LyhClassLibrary2
{
public class LyhClass : LyhInterface.ILyhInterface
{
public void Run()
{
throw new Exception(this.GetType().ToString());
}
}
}

namespace LyhClassLibrary3
{
public class LyhClass : LyhInterface.ILyhInterface
{
public void Run()
{
throw new Exception(this.GetType().ToString());
}
}
}

四、主程序

1、引用：LyhInterface.dll

2、动态加载程序集：LyhClassLibrary1.dll， LyhClassLibrary2.dll，LyhClassLibrary3.dll，存储文件夹：c:\libs\

注意：LyhInterface.dll不必随LyhClassLibrary1.dll， LyhClassLibrary2.dll，LyhClassLibrary3.dll发布到c:\libs\，其由主程序引用，随主程序发布并加载。

public partial class Form1 : Form
{
List<LyhInterface.ILyhInterface> list = new List<LyhInterface.ILyhInterface>();
int idx = 0;
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{

string dir = @"c:\Libs\";
string assemblyName = "LyhClassLibrary";
for (int i = 0; i < 3; i++)
{
Assembly assembly = Assembly.LoadFile(dir + assemblyName + (i+1).ToString() + ".dll");
Type type = assembly.GetType(assemblyName + (i+1).ToString() + ".LyhClass");
LyhInterface.ILyhInterface instance = System.Activator.CreateInstance(type) as LyhInterface.ILyhInterface;
list.Add(instance);
}
}

private void button2_Click(object sender, EventArgs e)
{
try
{
list[idx].Run();

}
catch(Exception ex)
{
idx++;
MessageBox.Show(ex.Message);
}
}