如何实现方法链接? [英] How to implement method chaining?

问题描述

在C#中，一个人如何实现在自己的自定义类中链接方法的功能，以便可以编写如下内容:

In C# how does one implement the ability to chain methods in one's custom classes so one can write something like this:

myclass.DoSomething().DosomethingElse(x); 

等...

谢谢！

推荐答案

链式是从现有实例中生成新实例的好方法:

Chaining is a good solution to produce new instance from existing instances:

public class MyInt
{
    private readonly int value;

    public MyInt(int value) {
        this.value = value;
    }
    public MyInt Add(int x) {
        return new MyInt(this.value + x);
    }
    public MyInt Subtract(int x) {
        return new MyInt(this.value - x);
    }
}

用法:

MyInt x = new MyInt(10).Add(5).Subtract(7);

---

您还可以使用此模式来修改现有实例，但是通常不建议这样做:

---

You can also use this pattern to modify an existing instance, but this is generally not recommended:

public class MyInt
{
    private int value;

    public MyInt(int value) {
        this.value = value;
    }
    public MyInt Add(int x) {
        this.value += x;
        return this;
    }
    public MyInt Subtract(int x) {
        this.value -= x;
        return this;
    }
}

用法:

MyInt x = new MyInt(10).Add(5).Subtract(7);

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