关于泛型的T类型问题！

Question

你可以试一试RTTI，比如System.Activator的用法。

Answer 1

如果你的这些类共有一个基类的话，就可以用工厂模式，根据反射来创建对应名称的类了
给你段代码参考
using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;namespace WinShape
{
    public abstract class Shape
    {
        public abstract string Draw();        public static Shape Create(string name)
        {
            return ShapeFactory.CreateShape(name);        }
    }
    public class Line : Shape
    {        public override string Draw()
        {
            return "Draw Line:  -----------------";
        }
    }    public class Circle : Shape
    {
        public override string Draw()
        {
            return "Draw Circle: OOOOOOOOOOOOOOOO";
        }
    }    public class Triangle : Shape
    {
        public override string Draw()
        {
            return "Draw Triangle: ^^^^^^^^^^^^^^";
        }
    }    internal abstract class ShapeFactory
    {
        private static Dictionary<string, ShapeFactory> factories = new Dictionary<string, ShapeFactory>();        protected abstract Shape GetShape();        internal static Shape CreateShape(string shapeName)
        {
               //double check to prevent create multiple instances by multiple threads
               if(!factories.ContainsKey(shapeName)) 
               {
                   lock (factories)
                   {
                       if (!factories.ContainsKey(shapeName))
                       {
                           Assembly assembly = Assembly.GetExecutingAssembly();
                           Type t = assembly.GetType(string.Format("WinShape.ShapeFactory+{0}Factory", shapeName));
                           if (t == null)
                               return null;
                           ShapeFactory factory = System.Activator.CreateInstance(t) as ShapeFactory;
                           factories.Add(shapeName, factory);
                       }
                   }
               }               ShapeFactory fac = factories[shapeName];
               return fac.GetShape();
        }        private class LineFactory : ShapeFactory
        {
            protected override Shape  GetShape()
            {
                return new Line();
            }
        }        private class CircleFactory : ShapeFactory
        {
            protected override Shape GetShape()
            {
                return new Circle();
            }
        }        private class TriangleFactory : ShapeFactory
        {
            protected override Shape GetShape()
            {
                return new Triangle();
            }
        }    }    
    
}