C＃任务阻塞UI

Question

我有这样的代码，反序列化JSON的网址，但GUI仍然被封锁，我不知道如何将它整理出来

**多少钱，我必须以写stackoverflow让我发布的东西？ “看起来你的文章主要是代码，请添加更多的细节。”

按钮代码：

private void button1_Click(object sender, EventArgs e) 
    { 
     var context = TaskScheduler.FromCurrentSynchronizationContext(); 
     string RealmName = listBox1.Items[listBox1.SelectedIndex].ToString(); 
     Task.Factory.StartNew(() => JsonManager.GetAuctionIndex().Fetch(RealmName) 
     .ContinueWith(t => 
     { 
      bool result = t.Result; 
      if (result) 
      { 
       label1.Text = JsonManager.GetAuctionIndex().LastUpdate + " ago"; 
       foreach (string Owner in JsonManager.GetAuctionDump().Fetch(JsonManager.GetAuctionIndex().DumpURL)) 
       { 
        listBox2.Items.Add(Owner); 
       } 
      } 
     },context)); 
    } 

取和反序列化功能

public async Task<bool> Fetch(string RealmName) 
    {   
     using (WebClient client = new WebClient()) 
     { 
      string json = ""; 
      try 
      { 
       json = client.DownloadString(new UriBuilder("my url" + RealmName).Uri);     
      } 
      catch (WebException) 
      { 
       MessageBox.Show(""); 
       return false; 
      } 
      catch 
      { 
       MessageBox.Show("An error occurred"); 
       Application.Exit(); 
      } 
      var results = await JsonConvert.DeserializeObjectAsync<RootObject>(json); 

      TimeSpan duration = DateTime.Now - Utilities.UnixTimeStampToDateTime(results.files[0].lastModified); 
      LastUpdate = (int)Math.Round(duration.TotalMinutes, 0); 
      DumpURL = results.files[0].url; 
      return true; 
     } 
    } 

在此先感谢

Answer 1

里面你Fetch方法，你也应该使用伺机通过从Web客户端下载您的字符串数据将其更改为：

json = await client.DownloadStringAsync(new UriBuilder("my url" + RealmName).Uri);     

而是采用了Task了，你应该使用延续，也等待着你的按钮事件处理程序：现在

private async Task button1_Click(object sender, EventArgs e) 
{ 
    string RealmName = listBox1.Items[listBox1.SelectedIndex].ToString(); 

    bool result = await JsonManager.GetAuctionIndex().Fetch(RealmName); 
    if (result) 
    { 
     label1.Text = JsonManager.GetAuctionIndex().LastUpdate + " ago"; 
     foreach (string Owner in await JsonManager.GetAuctionDump().Fetch(JsonManager.GetAuctionIndex().DumpURL)) 
     { 
      listBox2.Items.Add(Owner); 
     } 
    } 
} 

延续是C＃编译器设置。默认情况下，它将在UI线程上继续，因此您不必手动捕获当前的同步上下文。通过等待您的Fetch方法，您可以自动将任务展开到布尔，然后您可以继续在UI线程上执行代码。