如何使用带有C＃/ .NET的Reflection实例化程序集中的类？

我有这个库编译为calc.dll。

namespace MyClass { public class Calculator { public int Value1 {get; set;} public int Value2 {get; set;} public Calculator() { Value1 = 100; Value2 = 200; } public int Add(int val1, int val2) { Value1 = val1; Value2 = val2; return Value1 + Value2; } } } 

我想实例化Calculate类而不链接到calc.dll。 C＃可以做到吗？ 我想出了这个代码，但我不知道如何实例化Calculator类。

 using System; using System.IO; using System.Reflection; using System.Diagnostics; using System.Collections.Generic; namespace EX { public class Code { public static void Test() { string path = Directory.GetCurrentDirectory(); string target = Path.Combine(path, @"./myclass.dll"); Assembly asm = Assembly.LoadFrom(target); Calculator h = new Calculator(); // <-- ??? Type type = h.GetType(); MethodInfo m = type.GetMethod("Add"); int res = (int) m.Invoke(h, param); Console.WriteLine("{0}", res); } public static void Main() { Test(); } } } 

添加

我有两个解决方案，一个来自Bala R.

  var param = new object[] {100, 200}; string path = Directory.GetCurrentDirectory(); string target = Path.Combine(path, @"./myclass.dll"); Assembly asm = Assembly.LoadFrom(target); Type calc = asm.GetType("MyClass.Calculator"); object h = Activator.CreateInstance(calc); MethodInfo m = calc.GetMethod("Add"); int res = (int) m.Invoke(h, param); Console.WriteLine("{0}", res); 

这个是来自agent-j

  string path = Directory.GetCurrentDirectory(); string target = Path.Combine(path, @"./myclass.dll"); Assembly asm = Assembly.LoadFrom(target); Type type = asm.GetType("MyClass.Calculator"); ConstructorInfo ctor = type.GetConstructor(Type.EmptyTypes); object calc = ctor.Invoke(null); MethodInfo m = type.GetMethod("Add"); var param = new object[] {100, 200}; int res = (int) m.Invoke(calc, param); Console.WriteLine("{0}", res); 

他们两个都在工作，但我更喜欢Bala的解决方案，因为它更短，通过CreateInstance获取object h比获取构造函数获取object h(calc)更直观。

Answer 1

 object h = Activator.CreateInstance(asm.FullName, "MyClass.Calculator"); 

编辑：

看看这是否有效

 Type calc = asm.GetType("MyClass.Calculator)"; object h = Activator.CreateInstance(calc); 

Answer 2

 string path = Directory.GetCurrentDirectory(); string target = Path.Combine(path, @"./myclass.dll"); Assembly asm = Assembly.LoadFrom(target); Type type = asm.GetType("MyClass.Calculator"); ConstructorInfo ctor = type.GetConstructor(Type.EmptyTypes); object calc = ctor.Invoke (null); MethodInfo m = type.GetMethod("Add"); int res = (int) m.Invoke(calc, param); Console.WriteLine("{0}", res);