Question

如果您有以下方法：

public async Task<string> GetTAsync(url)
{
    return await httpClient.GetStringAsync(url); 
}

public async Task<List<string>> Get(){
   var task1 = GetTAsync(url1);
   var task2 = GetTAsync(url2);
   await Task.WhenAll(new Task[]{task1, task2}); 
   // but this may through if any  of the   tasks fail.
   //process both result
}

我该如何处理异常？我查看了HttpClient.GetStringAsync（url）方法的文档，它可能抛出的唯一异常似乎是ArgumentNullException。但至少我遇到禁止错误一次，并希望处理所有可能的异常。但我找不到任何具体的例外情况。我应该在这里捕获Exception异常吗？如果它更具体，我将不胜感激。请帮忙，这非常重要。

Answer 1

最后我认为如下：

public async Task<List<string>> Get()
{
   var task1 = GetTAsync(url1);
   var task2 = GetTAsync(url2);
   var tasks = new List<Task>{task1, task2};
   //instead of calling Task.WhenAll and wait until all of them finishes 
   //and which messes me up when one of them throws, i got the following code 
   //to process each as they complete and handle their exception (if they throw too)
   foreach(var task in tasks)
   {
      try{
       var result = await task; //this may throw so wrapping it in try catch block
       //use result here
      }
      catch(Exception e) // I would appreciate if i get more specific exception but, 
                         // even HttpRequestException as some indicates couldn't seem 
                         // working so i am using more generic exception instead. 
      {
        //deal with it 
      }
   } 
}

这是我最终想到的更好的解决方案。如果有更好的东西，我很乐意听到它。我发布这个 - 只是其他人遇到同样的问题。

httpclient.GetStringAsync（url）async api调用的异常处理

1 个答案: