如何在C#/.NET中使用反射来实例化程序集中的类

本文关键字：程序 实例化 程序集 集中 反射 NET | 更新日期: 2023-09-27 18:00:13

我有这个库要编译到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#能做到吗？我想出了这段代码，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();
        }
    }
}

已添加

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);

这个来自代理-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，但我有点喜欢Bala的解决方案，因为它更短，从object h到CreateInstance比从构造函数到object h(calc)更直观。

如何在C#/.NET中使用反射来实例化程序集中的类

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);      

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);
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