C＃对象初始化：从另外一个设置属性 [英] C# Object Initializer : Set Property from another one

问题描述

我有以下的对象，其中我在构造函数中我添加了一个新的GUID作为ID。

I have the following object where in my constructor I add a new Guid as the Id.

public class MyObject
{
  public MyObject()
  {
    Id = Guid.NewGuid().ToString();
  }

  public String Id { get; set; }
  public String Test { get; set; }

}

我想要做这样的事情在一个对象初始化

I want to do something like that in an object initializer :

var obj = new MyObject
{
  Test = Id; // Get new GUID created in constructor
}

这可能吗？

Is it possible?

推荐答案

没有，你不能这样做。你必须设置好​​它在一个单独的语句：

No, you can't do that. You'd have to just set it in a separate statement:

var obj = new MyObject();
obj.Test = obj.Id;

在对象初始属性的右侧仅仅是一个正常表达，没有任何内在。连接被初始化的对象。

The right-hand side of the property in an object initializer is just a normal expression, with no inherent connection to the object being initialized.

如果这是你经常要与一个特定类型的做一些事情，你可以添加一个方法：

If this is something you regularly want to do with one specific type, you could add a method:

public MyObject CopyIdToTest()
{
    Test = Id;
    return this;
}

然后使用：

and then use:

MyObject obj = new MyObject().CopyIdToTest();

或与其他属性：

MyObject obj = new MyObject 
{
    // Set other properties here
}.CopyIdToTest();

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