ASP.NET MVC Web API異步請求結果

Question

我有一個Web API控制器動作，該動作將請求發送到另一台服務器並獲取圖像。

public class MyController : ApiController
{ 
   public async Runner<HttpResponseMessage> Wms()
   {
       return await Run();                                    
   }

   private Task<HttpResponseMessage> Run()
   {
       HttpRequestMessage requestMessage = new HttpRequestMessage();
       requestMessage.RequestUri = "http://....";

       foreach (var header in this.Request.Headers)
          requestMessage.Headers.Add(header.Key, header.Value);

        return requestMessage.SendAsync();
   }
}

如何獲取requestMessage.SendAsync()異步請求結果

Answer 1

您需要將async修飾符添加到方法中，然后await SendAsync() ：

private async Task<HttpResponseMessage> RunAsync()
{
   HttpRequestMessage requestMessage = new HttpRequestMessage();
   requestMessage.RequestUri = "http://....";

   foreach (var header in this.Request.Headers)
      requestMessage.Headers.Add(header.Key, header.Value);

   HttpResponseMessage response = await requestMessage.SendAsync();
   string resultData = await response.Content.ReadAsStringAsync();
}

或者，如果您想在Wms進行響應，則可以await 。