我想从通用Windows Phone应用程序中的JSON文件解析,但我无法将任务转换为字符串
public MainPage()
{
this.InitializeComponent();
HttpClient httpClient = new HttpClient();
String responseLine;
JObject o;
try
{
string responseBodyAsText;
HttpResponseMessage response = httpClient.GetAsync("http://localhost/list.php").Result;
//response = await client.PostAsync(url, new FormUrlEncodedContent(values));
response.EnsureSuccessStatusCode();
responseBodyAsText = response.Content.ReadAsStringAsync().Result;
// responseLine = responseBodyAsText;
string Website = "http://localhost/list.php";
Task<string> datatask = httpClient.GetStringAsync(new Uri(string.Format(Website, DateTime.UtcNow.Ticks)));
string data = await datatask;
o = JObject.Parse(data);
Debug.WriteLine("firstname:" + o["id"][0]);
}
catch (HttpRequestException hre)
{
}
我在这行中有错误
string data = await datatask;
我该如何解决?
答案 0 :(得分:2)
您不能在构造函数中使用await
。您需要为此创建async
方法。
通常我不建议使用async void
,但是当你从构造函数中调用它时,它有点合理。
public MainPage()
{
this.InitializeComponent();
this.LoadContents();
}
private async void LoadContents()
{
HttpClient httpClient = new HttpClient();
String responseLine;
JObject o;
try
{
string responseBodyAsText;
HttpResponseMessage response = await httpClient.GetAsync("http://localhost/list.php");
//response = await client.PostAsync(url, new FormUrlEncodedContent(values));
response.EnsureSuccessStatusCode();
responseBodyAsText = await response.Content.ReadAsStringAsync();
// responseLine = responseBodyAsText;
string Website = "http://localhost/list.php";
Task<string> datatask = httpClient.GetStringAsync(new Uri(string.Format(Website, DateTime.UtcNow.Ticks)));
string data = await datatask;
o = JObject.Parse(data);
Debug.WriteLine("firstname:" + o["id"][0]);
}
catch (HttpRequestException hre)
{
// You might want to actually handle the exception
// instead of silently swallowing it.
}
}
答案 1 :(得分:-1)
尝试一下:
Task<string> post = postPostAsync("Url", data).Result.Content.ReadAsStringAsync();
post.Result.ToString();
答案 2 :(得分:-2)
查看this documentation,您可以使用:Result属性。
例如:
Task<int> task1 = myAsyncMethod(); //You can also use var instead of Task<int>
int i = task1.Result;