像Java一样的侦听器C# [英] listener c# like java

问题描述

我在struct中有字段字符串， 而且我想了解实时更改此领域的情况.

I have field string in struct, and i want learn real-time changed this field.

struct example {
public string ex;
}

examp = new example();<BR>
examp.ex = "test";

////// then program work and eamp.ex = "bing";

我需要方法

on_ex_changed() 
{
    if examp.ex changed then ..... 
}

在线和简单的plz

推荐答案

您可以按照以下步骤在设置器上放置一个事件. 每次调用setter时都会触发该事件.

You can put an event at the setter as follows. The event will be fired every time the setter is called.

public class MyObj
{
    private RectangleF mRectangle;

    public event EventHandler RectangleChanged;

    public RectangleF Rectangle
    {
        get
        {
            return mRectangle;
        }

        set
        {
            mRectangle = value;
            OnRectangleChanged();
        }
    }

    protected virtual void OnRectangleChanged()
    {
        if (RectangleChanged != null)
        {
            RectangleChanged(this, EventArgs.Empty);
        }
    }
}

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