c#-任务状态：等待激活-DownloadStringTaskAsync -WP8

任务的状态始终为“等待激活”.任务的结果=“”.
我不明白为什么…谢谢您的帮助
UI调用GetDocLibs方法.

public class ServerFunctions
{
    public static List<BdeskDocLib> GetDocLibs(bool onlyDocLibPerso)
    {
        string xmlContent = GetXml();
        List<BdeskDocLib> result = BdeskDocLib.GetListFromXml(xmlContent,  onlyDocLibPerso);
        return result;
    }

   private static String GetXml()
    {  
        Task<String>task=requesteur.Query(dataRequestParam);
        task.Wait();
        xmlResult = task.Result;
        return xmlResult;
    }
}

public class DataRequest
{
    public Task<String> Query(DataRequestParam dataRequestParam)
    {
       try
       {
        WebClient web = new WebClient();    
        if (!string.IsNullOrEmpty(dataRequestParam.AuthentificationLogin))
        {
            System.Net.NetworkCredential account = new NetworkCredential(dataRequestParam.AuthentificationLogin, dataRequestParam.AuthentificationPassword);
            web.Credentials = account;
        }
        return  web.DownloadStringTaskAsync(dataRequestParam.TargetUri).ConfigureAwait(false); 
     }  
 catch(WebException we)
        {
            MessageBox.Show(we.Message);
            return null;
        }
   } 
}     

解决方法:

我所有的方法都必须异步.

public class ServerFunctions
{
    public static async Task<List<BdeskDocLib>> GetDocLibs(bool onlyDocLibPerso)
    {
        string xmlContent = await GetXml();
        List<BdeskDocLib> result = BdeskDocLib.GetListFromXml(xmlContent,  onlyDocLibPerso);
        return result;
    }

   private async static Task<String> GetXml()
    {  
        Task<String>task=requesteur.Query(dataRequestParam);
        task.Wait();
        xmlResult = task.Result;
        return xmlResult;
    }
}

标签：asynchronous,async-await,task,windows-phone-8,c
来源： https://codeday.me/bug/20191122/2057426.html