c# - 如何从 C# Xamarin 中的 HTTP post 获取数据？

Question

我正在尝试使用 HTTPClient 发布一些数据。在简单地获取 JSON 格式的数据时，我设法使用了以下代码，但它似乎不适用于 POST。

这是我正在使用的代码:

public static async Task<SwipeDetails> SaveSwipesToCloud()
{
    //get unuploaded swips
   IEnumerable<SwipeDetails> swipesnotsved =  SwipeRepository.GetUnUploadedSwipes();

    foreach (var item in swipesnotsved)
    {
        //send it to the cloud
        Uri uri = new Uri(URL + "SaveSwipeToServer" + "?locationId=" + item.LocationID + "&userId=" + item.AppUserID + "&ebCounter=" + item.SwipeID + "&dateTimeTicks=" + item.DateTimeTicks + "&swipeDirection=" + item.SwipeDirection + "&serverTime=" + item.IsServerTime );

        HttpClient myClient = new HttpClient();
        var response = await myClient.GetAsync(uri);

        //the content needs to update the record in the SwipeDetails table to say that it has been saved.
        var content = await response.Content.ReadAsStringAsync();            
    }
    return null;
}

这是它试图联系的方法。如您所见，该方法还返回一些 JSON 格式的数据，因此除了 POST 之外，它还会返回一些我需要能够使用的数据:

[HttpPost]
public JsonResult SaveSwipeToServer(int locationId, int userId, int ebCounter, long dateTimeTicks, int swipeDirection, int serverTime)
{
    bool result = false;
    string errMsg = String.Empty;
    int livePunchId = 0;
    int backupPunchId = 0;
    IClockPunch punch = null;
    try
    {
        punch = new ClockPunch()
        {
            LocationID = locationId,
            Swiper_UserId = userId,
            UserID = ebCounter,
            ClockInDateTime = DateTimeJavaScript.ConvertJavascriptDateTime(dateTimeTicks),
            ClockedIn = swipeDirection.Equals(1),
        };

        using (IDataAccessLayer dal = DataFactory.GetFactory())
        {
            DataAccessResult dalResult = dal.CreatePunchForNFCAPI(punch, out livePunchId, out backupPunchId);
            if (!dalResult.Result.Equals(Result.Success))
            {
                throw dalResult.Exception;
            }
        }
        result = true;
    }

    catch (Exception ex) 
    {
        errMsg = "Something Appeared to go wrong when saving punch information to the horizon database.\r" + ex.Message;
    }
    return Json(new
    {
        result = result,
        punchDetails = punch,
        LivePunchId = livePunchId,
        BackUpPunchId = backupPunchId,
        timeTicks = DateTimeJavaScript.ToJavaScriptMilliseconds(DateTime.UtcNow),
        errorMessage = errMsg
    }
    ,JsonRequestBehavior.AllowGet);
}

目前存储在“内容”中的数据只是一条错误消息。

Answer 1

您可以在请求正文中发布参数。

public static async Task<SwipeDetails> SaveSwipesToCloud() {
    //get unuploaded swips
    var swipesnotsved =  SwipeRepository.GetUnUploadedSwipes();

    var client = new HttpClient() {
        BaseAddress = new Uri(URL)
    };
    var requestUri = "SaveSwipeToServer";

    //send it to the cloud
    foreach (var item in swipesnotsved) {

        //create the parameteres
        var data = new Dictionary<string, string>();
        data["locationId"] = item.LocationID;
        data["userId"] = item.AppUserID;
        data["ebCounter"] = item.SwipeID;
        data["dateTimeTicks"] = item.DateTimeTicks;
        data["swipeDirection"] = item.SwipeDirection;
        data["serverTime"] = item.IsServerTime;

        var body = new System.Net.Http.FormUrlEncodedContent(data);

        var response = await client.PostAsync(requestUri, body);

        //the content needs to update the record in the SwipeDetails table to say that it has been saved.
        var content = await response.Content.ReadAsStringAsync();            
    }
    return null;
}