通过反射，创建类的实例三

╰半夏微凉° 2022-06-05 23:47 234阅读 0赞

这次我们通过构造函数的方式处理

using System;
    using System.Reflection;
    
    namespace App
    {
        public class TypeHelper
        {
            public static object CreateObject<T>(params object[] args) where T : Interface.IObjcet
            {
                try
                {
                    Type myType = typeof(T);
    
                    int lenght = 0;
                    if (args != null)
                    {
                        lenght = args.Length;
                    }
    
                    Type[] types = new Type[lenght];
                    for (int i = 0; i < args.Length; i++)
                    {
                        types[i] = args[i].GetType();
                    }
    
                    object[] param = new object[lenght];
                    for (int i = 0; i < args.Length; i++)
                    {
                        param[i] = args[i];
                    }
    
                    object obj = null;
    
                    // Get the constructor that takes an integer as a parameter.
                    ConstructorInfo constructorInfoObj = myType.GetConstructor(types);
    
                    //ConstructorInfo constructorInfoObj = myType.GetConstructor(BindingFlags.Instance | BindingFlags.Public, null, types, null);
                    //ConstructorInfo constructorInfoObj = myType.GetConstructor(BindingFlags.Instance | BindingFlags.Public, null,CallingConventions.HasThis, types, null);
    
                    //CustomBinder customBinder = new CustomBinder();
                    //ConstructorInfo constructorInfoObj = myType.GetConstructor(BindingFlags.Instance | BindingFlags.Public, customBinder, CallingConventions.HasThis, types, null);
    
                    if (constructorInfoObj != null)
                    {
                        Console.WriteLine("The constructor of PlugPut that takes an integer as a parameter is: " + constructorInfoObj.ToString());
                        //调用指定参数的构造函数
                        obj = constructorInfoObj.Invoke(param);
                    }
                    else
                    {
                        Console.WriteLine("The constructor of PlugPut that takes an integer as a parameter is not available.");
                        obj = Activator.CreateInstance(myType, null);
                    }
                    return obj;
                }
                catch (Exception)
                {
                    throw;
                }
            }
        }
    }

class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("");
    
            Test1();
    
            Console.ReadLine();
        }
    
        static void Test1()
        {
            Console.Write("Put plus value is:");
            string strPlus = Console.ReadLine();
    
            //无参构造函数
            IObjcet obj = (IObjcet)TypeHelper.CreateObject<NetStar.Biz.PlugPut>();
            obj.Put();
            obj.Put(strPlus);
    
            //定义构造函数所需参数
            object[] param = new object[1];
            param[0] = strPlus;
    
            //带参数的构造函数
            obj = (IObjcet)TypeHelper.CreateObject<NetStar.Biz.PlugPut>(param);
            obj.Put();
            obj.Put(strPlus);
        }
    
        ......

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