创建一个静态数据更新过程 [英] create a static data update process

问题描述

要执行以下操作
创建一个名为sindhu
的新C#类
此类中将是一个公共方法LoadXMLData()，该方法可以向用户报告数据更新成功还是失败.

将从我们在屏幕中创建的按钮中调用它.

Ho to do the following
create a new C# class called sindhu

In this class will be a public method LoadXMLData() which can report to the user if the update of the data is succeeded or failed.

It will be called from a button in the which we create in a screen

推荐答案

在VS中右键单击项目名称.
选择添加...类".
将其命名为"sindhu"，然后按OK
对其进行修改，使其为静态.
添加您的公共静态方法，返回一个布尔值，或者创建一个成功和失败的事件，并在进行任何后台处理时发出相应的信号.



如何创建事件.这就是我被打动的地方?单击我创建的按钮时应调用此事件".

一个事件很容易构造:

Right click the project name in VS.
Select "Add...Class".
Name it "sindhu" and press OK
Modify it so that it is static.
Add your public static method, either returning a bool value, or create a succeeded and a failed event and signal the appropriate one if you do any background processing.



"how to create the event..this is where I''m getting strucked??and this event should be called when I click on a button which I create"

An event is pretty easy to construct:

public static class sindhu
    {
    public static event EventHandler Success;

    private static void OnSuccess(EventArgs e)
        {
        EventHandler eh = Success;
        if (eh != null)
            {
            eh(null, e);
            }
        }
    }

但是您不调用"一个事件，而是提供一个在信号通知该事件时调用的处理程序:

But you don''t "call" an event, instead you provide a handler which is called when the event is signalled:

sindhu.Success += new EventHandler(sindhu_Success);
...

void sindhu_Success(object sender, EventArgs e)
    {
    ... // Do something on success.
    }

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