调用BackgroundWorker来更新UI

问题描述

Hi


我有一个Class，它包含一个BackgroundWorker，用于从数据库更新Form中的数据。另外我还有一个用于创建上下文菜单及其事件的类。

我必须从第二堂课的活动中调用backgroundworker。是否可以这样做。





示例代码



class Main

Hi
I have a Class which contains a BackgroundWorker to update the data in Form from database. Also I have a another class which is used to create a context menu and its events.
I have to call backgroundworker from the event in the second class. Is it Possible to do it.


sample Code

class Main

public partial class FormMain: Form
{
 private void bwMain_DoWork(object sender, DoWorkEventArgs e)
 {
   //Fetch data

 }
 private void bwMain_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
 {
   //Update UI  
 }

}

public class MenuMain
{
 MenuMain()
 {
  MenuItem miPayLoan = new MenuItem("Menu1", new EventHandler(Menu1_Click));
 }
  private void miPayLoan_Click(object sender, EventArgs e)
{
  //do some operations 
  //here call backgroundworker of above class to update Form   
}
}

谢谢..

Thanks ..

推荐答案

private void miPayLoan_Click(object sender, EventArgs e)
{
    //do some operations
    //here call backgroundworker of above class to update Form
    MainForm.StartFormUpdatingMethod();
}

当然，您需要更多代码。在FormMain.cs中：

Of course, you need a bit more code. In your FormMain.cs:

public partial class FormMain : Form
{
    // This may also reside in FormMain.Designer.cs,
    //   depends on how you added it to the project.
    BackgroundWorker bwMain = new BackgroundWorker();

    public void StartFormUpdatingMethod()
    {
        bwMain.StartAsync();
    }

    // What you showed already
}

要使其工作，您需要引用 miPayLoan_Click（）中提供的FormMain实例。如果它位于 FormMain 类本身内，那是微不足道的。否则你必须提供参考。

To make this work, you need a reference to the instance of FormMain available in miPayLoan_Click(). If it resides within the FormMain class itself, that's trivial. Otherwise you'll have to provide a reference.

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