Question

我有这个异步函数，可以从我的Xamarin.iOS应用程序中同时从两个不同的地方调用它。但是只有其中一个有效。

public async Task<Response> GetMenu(int appType, int appVersion)
{
     try {
         var url = string.Format(RestApiPaths.LEFT_MENU_CONTROLLER_LIST, appType, appVersion);
         string result = await httpCall.GetAsync(url, App.Instance.Platform);
         System.Diagnostics.Debug.WriteLine("GetMenu.Response: " + result);
         return new Response(JsonConvert.DeserializeObject<List<LeftMenuDetails>>(result));
     } catch (Exception e) {
         Debug.WriteLine("---------------");
         Debug.WriteLine(e.ToString());
         return new Response(status: false, message: "", error: true, errorType: 500, errorMessage: "");
     }
}

，对于另一个，结果为null。

应用程序输出

Cannot access a disposed object.
Object name: 'System.Net.Http.ByteArrayContent'.
GetLeftMenuÍ.Response: 
Value cannot be null.
Parameter name: value

当我通过添加一些延迟来调用第二个时，两者都起作用。但是为什么它不能同时工作。

这是GetAsync方法：

public async Task<string> GetAsync(string url, int platform)
{
    try {
        using (var client = GetAuthenticatedHttpClient(platform)) {
            using (var r = await client.GetAsync(new Uri(url))) {
                string result = await r.Content.ReadAsStringAsync();
                Debug.WriteLine(string.Format("Get({0}).Result: {1}", url, result));
                if (string.Compare(result, NoSession) == 0 || string.Compare(result, NoSession2) == 0) {
                    bool ReLoginStatus = await userApiCall.ReLogin(platform, username, password);
                    if (!ReLoginStatus)
                        return null;
                    return await GetAsync(url, platform);
                }
                return result;
            }
        }
    } catch (Exception e) {
        Debug.WriteLine("-------------");
        Debug.WriteLine(e.ToString());
    }
    return null;
}

编辑：

-------------
System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'System.Net.Http.ByteArrayContent'.
  at System.Net.Http.HttpContent.LoadIntoBufferAsync (System.Int64 maxBufferSize) [0x00019] in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/external/mono/mcs/class/System.Net.Http/System.Net.Http/HttpContent.cs:140 
  at System.Net.Http.HttpContent.ReadAsStringAsync () [0x00028] in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/external/mono/mcs/class/System.Net.Http/System.Net.Http/HttpContent.cs:172 
  at Gogch.HttpCall.GetAsync (System.String url, System.Int32 platform) [0x00104] in /Users/sarath/Developer/Workspace/GCH Mobile App/Gogch/APICalls/Implementation/HttpCall.cs:28 
GetLeftMenu.Response: 
---------------
System.ArgumentNullException: Value cannot be null.
Parameter name: value
  at Newtonsoft.Json.Utilities.ValidationUtils.ArgumentNotNull (System.Object value, System.String parameterName) [0x00003] in <9b6398b0b3ae4afdb586fd62eda2ead4>:0 
  at Newtonsoft.Json.JsonConvert.DeserializeObject (System.String value, System.Type type, Newtonsoft.Json.JsonSerializerSettings settings) [0x00000] in <9b6398b0b3ae4afdb586fd62eda2ead4>:0 
  at Newtonsoft.Json.JsonConvert.DeserializeObject[T] (System.String value, Newtonsoft.Json.JsonSerializerSettings settings) [0x00000] in <9b6398b0b3ae4afdb586fd62eda2ead4>:0 
  at Newtonsoft.Json.JsonConvert.DeserializeObject[T] (System.String value) [0x00000] in <9b6398b0b3ae4afdb586fd62eda2ead4>:0 
  at Gogch.AccountHttpCall.GetMenu (System.Int32 appType, System.Int32 appVersion) [0x000f5] in /Users/sarath/Developer/Workspace/GCH Mobile App/Gogch/APICalls/Implementation/AccountHttpCall.cs:501

并行运行相同的异步功能多次

0 个答案: