如何使用.Net framework v3.5 调用异步任务

Question

如何调用async Task Framework 3.5 请帮助我。我在我的 3.5 框架项目中调用此方法它显示了一个 error.any alternet 方式 post json 使用 Framework 3.5 的数据 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 版的 .Net 框架无法做到这一点。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版本，例如 4.6 版本或
3. 使用WebClient instead of the HttpClient if your use-case is simple and if it's not (ex: manipulating headers, etc) then use the HttpWebRequest对象：

这是一个使用 WebClient class. It might not work correctly depending on how you're setting up your HttpClient:

的例子

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