从字符串创建对象 [英] Create an object from a string

问题描述

大家好，



关于这个主题有一些问题和答案，但是，没有一个能解决我的问题。我是一个关于c＃的新手。



我是一个班级并且有一个字符串值。如果字符串值与类名相同，则从该类创建新对象。



字符串值是基本

和班级名称是基本



我知道解决方案是Assembly.CreateInstance，但它总是为空，无法成功创建任何实例。



名称：TTT Publickeytoken = null

CodeBase：TTT.exe文件的路径



我尝试过：

命名空间TTT 
 {
 public class Basic 
 {
 public string Id {get;组; 
 public int SourceSystem {get;组; } 
} 
公共类Message_Tag_Info 
 {
 public string Id {get;组; } 
公共字符串ClassCode {get;组; } 
公共字符串ClassName {get;组; } 
} 
 
 class程序
 {
 static void Main（string [] args）
 {
 Message_Tag_Info message = new Message_Tag_Info（） ; 
 
 string tmp =Basic; 
 message.ClassName = tmp; 
 
 
类型t = Type.GetType（TTT。+ message.ClassName）; 
 
 Assembly assem = Assembly.GetAssembly（t）; 
 Console.WriteLine（Name：{0}，assem.FullName）; 
 Console.WriteLine（CodeBase：{0}，assem.CodeBase）; 
 
 var obj = Assembly.GetExecutingAssembly（）。CreateInstance（message.ClassName）; 
 
 Console.ReadLine（）; 
 
} 
 
} 
} 

解决方案

你试过吗？ Activator.CreateInstance，下面是几个例子，我希望这有帮助



c＃ - 创建一个类名的对象实例，其名称在字符串变量中 - Stack Overflow

c＃ - 从字符串创建类的实例 - Stack Overflow

你只是在基本上做CreateInstance而且这还不足以反映出你的意思是什么类，它需要全名TTT.Basic



下面我使用t.FullName代替

 var obj = Assembly.GetExecutingAssembly（ ）.CreateInstance（t.FullName）; 

Hi all,

There are some questions and answers about this topic but, none of them solve my issue. I am a quite new about c#.

I've a class and had a string value. If the string value same with class name, create new object from that class.

string value is "Basic"
and class name is "Basic"

I know the solution is Assembly.CreateInstance but it always gets null , could not success to create any instance.

Name:TTT Publickeytoken=null
CodeBase: path to TTT.exe file

What I have tried:

namespace TTT
{ 
    public class Basic
    {
        public string Id { get; set; }
        public int SourceSystem { get; set; }
    }
 public class Message_Tag_Info
    {
        public string Id { get; set; }
        public string ClassCode { get; set; }
        public string ClassName { get; set; }
    }

   class Program
    {
        static void Main(string[] args)
        {
            Message_Tag_Info message = new Message_Tag_Info();
            
            string tmp = "Basic";
            message.ClassName = tmp;


           Type t = Type.GetType("TTT."+message.ClassName);

           Assembly assem = Assembly.GetAssembly(t);
           Console.WriteLine("Name: {0}", assem.FullName);        
           Console.WriteLine("CodeBase: {0}", assem.CodeBase);

       var obj = Assembly.GetExecutingAssembly().CreateInstance(message.ClassName);

           Console.ReadLine();

        }
        
    }
}

解决方案

Have you tried Activator.CreateInstance, below are few examples, I hope this helps

c# - Create object instance of a class having its name in string variable - Stack Overflow
c# - Create an instance of a class from a string - Stack Overflow

You're doing CreateInstance on just "Basic" and that's not enough for reflection to work out what class you mean, it needs the full name of TTT.Basic

Below I use t.FullName instead

var obj = Assembly.GetExecutingAssembly().CreateInstance(t.FullName);

这篇关于从字符串创建对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！