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.net 同一函数执行时如何知道回调结果,有更好的方式吗

0
[待解决问题]

问题由来:

想把部分异步函数改一下,可以支持同步

语言:

.NET C#

------------------------------------------------------------------------------

原来代码:

>先注册登录结果通知 OnLogin;

>调用 Login(userId,password) 后马上返回不阻塞

>成功或失败时在 OnLogin 中通知

代码如下:

 

public delegate void delegateOnLogin(string userId,bool loginStatus,string info);

public delegateOnLogin OnLogin;

 

public void Login(string userId,string password) 

{

    //调用第三方库进行登录

    return;

}

 

//登录成功或失败时会调用该通知

public void OnLogin(string userId,bool loginStatus,string info) 

{

    if( OnLogin != null )

        OnLogin( userId,loginStatus,info );

}

 

------------------------------------------------------------------------------

改过的代码:

定义一个全局变量如 m_LoginStatus ,如 Login 执行时先初始化 m_LoginStatus = -1;当 OnLogin 成功则改为 m_LoginStatus = 1,失败则改为 m_LoginStatus = 0; 在Login 中加一个while 循环一直判断

 

private m_LoginStatus = -1;

public bool Login(string userId,string password) 

{

    m_LoginStatus = -1;

    //调用第三方库进行登录

    while(true)

    {

        if ( m_LoginStatus == -1)

            Thread.Sleep(10);

        else if ( m_LoginStatus == 0)

            return true;

        else

            return false;

    }

}

 

public void OnLogin(string userId,bool loginStatus,string info) 

{

     if ( loginStatus == true )

         m_LoginStatus = 1;

     else

         m_LoginStatus = 0;

}

 

登录函数只是其中一种,有多个函数都得改成同步的,大家有更好的方式吗?谢谢。

dllnetspy的主页 dllnetspy | 菜鸟二级 | 园豆:202
提问于:2017-02-17 13:40
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所有回答(1)
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MSDN的例子。
//
You can run this code in Visual Studio 2013 as a WPF app or a Windows Store app. // You need a button (StartButton) and a textbox (ResultsTextBox). // Remember to set the names and handler so that you have something like this: // <Button Content="Button" HorizontalAlignment="Left" Margin="88,77,0,0" VerticalAlignment="Top" Width="75" // Click="StartButton_Click" Name="StartButton"/> // <TextBox HorizontalAlignment="Left" Height="137" Margin="88,140,0,0" TextWrapping="Wrap" // Text="TextBox" VerticalAlignment="Top" Width="310" Name="ResultsTextBox"/> // To run the code as a WPF app: // paste this code into the MainWindow class in MainWindow.xaml.cs, // add a reference to System.Net.Http, and // add a using directive for System.Net.Http. // To run the code as a Windows Store app: // paste this code into the MainPage class in MainPage.xaml.cs, and // add using directives for System.Net.Http and System.Threading.Tasks. private async void StartButton_Click(object sender, RoutedEventArgs e) { // ExampleMethodAsync returns a Task<int>, which means that the method // eventually produces an int result. However, ExampleMethodAsync returns // the Task<int> value as soon as it reaches an await. ResultsTextBox.Text += "\n"; try { int length = await ExampleMethodAsync(); // Note that you could put "await ExampleMethodAsync()" in the next line where // "length" is, but due to when '+=' fetches the value of ResultsTextBox, you // would not see the global side effect of ExampleMethodAsync setting the text. ResultsTextBox.Text += String.Format("Length: {0}\n", length); } catch (Exception) { // Process the exception if one occurs. } } public async Task<int> ExampleMethodAsync() { var httpClient = new HttpClient(); int exampleInt = (await httpClient.GetStringAsync("http://msdn.microsoft.com")).Length; ResultsTextBox.Text += "Preparing to finish ExampleMethodAsync.\n"; // After the following return statement, any method that's awaiting // ExampleMethodAsync (in this case, StartButton_Click) can get the // integer result. return exampleInt; } // Output: // Preparing to finish ExampleMethodAsync. // Length: 53292

 

Hoze | 园豆:196 (初学一级) | 2017-03-02 11:13
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