namespace AssemblyLibrary

{

    public class AssemblyLibrary

    {

        public static object LoadAssembly(string filePath,string nameSpace,string typeName,string methodName,object[] parameters)

        {

            try

            {

                byte[] filesByte = File.ReadAllBytes(filePath);

                Assembly assembly = Assembly.Load(filesByte);

                System.Type[] types = assembly.GetTypes();

                foreach (System.Type dllType in types)

                {

                    if (dllType.Namespace == nameSpace && dllType.Name == typeName)

                    {

                        Type type = assembly.GetType(nameSpace + "." + typeName);

                        object obj = System.Activator.CreateInstance(type);

                        MethodInfo methodInfo = type.GetMethod(methodName);

                        if (methodInfo != null)

                        {

                            return methodInfo.Invoke(obj, parameters);

                        }

                    }

                }

                return null;

            }

            catch (Exception ex)

            {

                throw ex;

            }

        }

    }

}

private void btnExecte_Click(object sender, EventArgs e)

{

     try

       {

             if (this.txtPathFile.Text.Trim() == "")

             {

                    MessageBox.Show("请输入相关查询条件!", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Question);

                    return;

             }

                object obj = AssemblyLibrary.AssemblyLibrary.LoadAssembly(this.txtPathFile.Text,"TestLibrary", "TestLibrary", "GetMethod", new object[] { this.txtParameters.Text }); 
　　　　　　　　　 if (obj != null) { MessageBox.Show(obj.ToString(), "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Question); }
　　　} 
　　 catch (Exception ex)
　　 {
　　　　　　MessageBox.Show(ex.Message, "异常提示", MessageBoxButtons.OK, MessageBoxIcon.Question); 
　　} 
}

namespace TestLibrary

{

    public class TestLibrary

    {

        public string GetMethod(string parm)

        {

            switch (parm)

            {

                case "":

                    return "";

                case "":

                    return "";

                case "":

                    return "";

                default:

                    return "";

            }

        }

    }

}