如何使用.Net framework v3.5调用异步任务

Question

如何调用异步任务框架3.5请帮帮我。我在我的3.5框架项目中调用此方法，它显示了一个错误。使用Framework 3.5发布json数据的任何alternet方式这是我的代码：

public async void APIPushStatusDriverPostion(string direction,string carColor,string supplier_company,string SupplierAccountId,string Karho_Ref,string booking_id,string vehicale_type, string vehicle_id, string vehicle_plate, double latitude, double longitude, string carModel, string status, string driver_id, string driver_phone, string driver_first_name, string driver_last_name)
{
    APIKarhoBookingProperties objbooking = new APIKarhoBookingProperties();
    objbooking.vehicle.vehicle_type   = vehicale_type;
    objbooking.vehicle.vehicle_id     =    vehicle_id;
    objbooking.vehicle.vehicle_plate  = vehicle_plate;
    objbooking.vehicle.latitude       =   latitude;
    objbooking.vehicle.longitude      =    longitude;
    objbooking.vehicle.eta_minutes    = "null";
    objbooking.vehicle.make           = "null";
    objbooking.vehicle.model = carModel;
    objbooking.vehicle.color = carColor;
    objbooking.vehicle.status = status;
    objbooking.vehicle.driver_id = driver_id;
    objbooking.vehicle.driver_phone = driver_phone;
    objbooking.vehicle.driver_phone = driver_first_name;
    objbooking.vehicle.driver_last_name = driver_last_name;          

    var json = JsonConvert.SerializeObject(objbooking);
    using (var response = await httpClient.PostAsync("{supplier_id}/availability?version=2", json))
    {
        string responseData = await response.Content.ReadAsStringAsync();
    }

}

Answer 1

使用3.5版本的.Net框架是不可能的。您的解决方案是：

1. 不使用基于async / await / Task的方法或
2. 将目标框架更改为更新的内容，例如4.6版本或
3. 如果您的用例很简单，如果不是（例如：操纵标题等），请使用WebClient代替HttpClient，然后使用HttpWebRequest对象：

以下是使用WebClient类的示例。它可能无法正常运行，具体取决于您设置HttpClient：

的方式

using (WebClient client = new WebClient())
{
    string responseData = client.UploadString(host + "{supplier_id}/availability?version=2", json);
}