Question

我从Angular应用程序调用自定义Web API，我需要两次JSON.parse（）我的响应才能访问属性。我不确定为什么会这样。

    /// <summary>
    /// Gets list of printers
    /// </summary>
    [HttpGet]
    public IHttpActionResult GetPrinterList()
    {
        try
        {
            List<Printer> pl = new List<Printer>();
            // List the print server's queues
            PrintQueueCollection myPrintQueues = new PrintServer(@"\\LPH-Printers").GetPrintQueues();
            foreach (PrintQueue pq in myPrintQueues)
            {
                Printer p = new Printer();
                p.Name = pq.FullName;

                pl.Add(p);
            }

            return Ok(JsonConvert.SerializeObject(pl));
        }
        catch (Exception e)
        {
            return BadRequest(e.ToString());
        }
    }

这是我的API中的方法，下面是我在Angular中调用它的方法

    'use strict';
    app.factory('printerService', ['$http', 'ngAuthSettings', function ($http, ngAuthSettings) {

var serviceBase = ngAuthSettings.apiServiceBaseUri;
var printerServiceFactory = {};

var _DefaultPrinter = function (val) {
    return $http.get(serviceBase + 'api/LibertyMobile/GetUserDefaultPrinter', {
        params: { 'username': val }
    })
};

var _SetDefaultPrinter = function (userName, DefaultPrinter) {
    return $http({
        url: serviceBase + "api/LibertyMobile/SaveUserDefaultPrinter",
        method: "POST",
        params: { 'username': userName, 'printer': DefaultPrinter }
    });
}

var _GetPrinterList = function () {
    return $http.get(serviceBase + 'api/LibertyMobile/GetPrinterList');
}

printerServiceFactory.DefaultPrinter = _DefaultPrinter;
printerServiceFactory.SetDefaultPrinter = _SetDefaultPrinter;
printerServiceFactory.GetPrinterList = _GetPrinterList;

return printerServiceFactory;

}]）;

非常感谢任何帮助。

    public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Web API configuration and services
        // Configure Web API to use only bearer token authentication.
        config.SuppressDefaultHostAuthentication();
        config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));

        // Web API routes
        config.MapHttpAttributeRoutes();

        //config.Routes.MapHttpRoute(
        //    name: "DefaultApi",
        //    routeTemplate: "api/{controller}/{id}",
        //    defaults: new { id = RouteParameter.Optional }
        //);

        //config.Routes.MapHttpRoute(
        //      name: "GetPartNumbers",
        //      routeTemplate: "api/Inventory/GetPartNumbers/{partnum}/{user}",
        //      defaults: new { controller = "Inventory" }
        //);

        config.Routes.MapHttpRoute(
              name: "ApiByAction",
              routeTemplate: "api/{controller}/{action}",
              defaults: new { controller = "Inventory", action = RouteParameter.Optional }
        );
    }
}

以上是我的WebApiConfig.cs代码。

Answer 1

此

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="15dp"
    android:orientation="horizontal"
    xmlns:android="http://schemas.android.com/apk/res/android"
    >

  <LinearLayout
      android:layout_width="0dp"
      android:layout_weight="1"
      android:layout_height="75dp"
      >
  <ImageView
      android:id="@+id/contactphone"
      android:layout_width="75dp"
      android:src="@drawable/phonecall"
      android:layout_margin="10dp"
      android:background="@drawable/contact_icon_round"
      android:layout_height="75dp" />
  </LinearLayout>
  <LinearLayout
      android:layout_width="0dp"
      android:layout_weight="1"
      android:layout_height="75dp"
      >
  <ImageView
      android:id="@+id/contactemail"
      android:layout_width="75dp"
      android:src="@drawable/mail"
      android:layout_margin="10dp"
      android:background="@drawable/contact_icon_round"
      android:layout_height="75dp" />
  </LinearLayout>
  <LinearLayout
      android:layout_width="0dp"
      android:layout_weight="1"
      android:layout_height="75dp"
      >
  <ImageView
      android:id="@+id/contactlocation"
      android:layout_width="75dp"
      android:src="@drawable/location"
      android:layout_margin="10dp"
      android:background="@drawable/contact_icon_round"
      android:layout_height="75dp" />
  </LinearLayout>
</LinearLayout>

框架将序列化为您传递的值，但您也在使用return Ok(JsonConvert.SerializeObject(pl));对其进行序列化，然后将其传递给操作结果，从而进行双序列化。

只需将值传回

JsonConvert.SerializeObject

让框架做到这一点。

无法找到为什么我的返回被序列化两次

1 个答案: