ASP.Net WEB API 失败 POST 来自移动设备的大量 JSON 数据

Question

我正在使用来自 Mobile.Its 的 ASP.net WEB api 每次 time.I 失败我都会收到此错误。

Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property.

我已经在 Webconfig 上添加了 maxJsonLength

    <system.webServer>
    <modules>
      <remove name="FormsAuthentication" />
      <remove name="ApplicationInsightsWebTracking" />
      <add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" preCondition="managedHandler" />
    </modules>
    <validation validateIntegratedModeConfiguration="false" />
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="2147483648" />
      </requestFiltering>
    </security>
  </system.webServer>
  <system.web.extensions>
    <scripting>
      <webServices>
        <jsonSerialization maxJsonLength="2147483644"/>
      </webServices>
    </scripting>
  </system.web.extensions>

这是我的控制器，我怎样才能在 postDataForSync 方法中得到 JSON？现在它在构造函数方法后崩溃。

 public class MobileAPIController : Controller
{
    JavaScriptSerializer serializer;
    public MobileAPIController() {

        serializer = new JavaScriptSerializer();
        serializer.MaxJsonLength = Int32.MaxValue;

    }


    //
    //GET : MobileAPI/login

    public object login(string userId, string password)
    { 
    }

    //
    //GET : MobileAPI/getDataForSync
    public object getDataForSync(string userId) {

    }

    //
    //POST : MobileAPI/postDataForSync
    [HttpPost]
    public object postDataForSync(string syncData_)
    {
    }
}

错误，

[ArgumentException: Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property.
Parameter name: input]
   System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(JavaScriptSerializer serializer, String input, Type type, Int32 depthLimit) +168
   System.Web.Mvc.JsonValueProviderFactory.GetDeserializedObject(ControllerContext controllerContext) +211
   System.Web.Mvc.JsonValueProviderFactory.GetValueProvider(ControllerContext controllerContext) +16
   System.Web.Mvc.ValueProviderFactoryCollection.GetValueProvider(ControllerContext controllerContext) +69
   System.Web.Mvc.ControllerBase.get_ValueProvider() +30
   System.Web.Mvc.ControllerActionInvoker.GetParameterValue(ControllerContext controllerContext, ParameterDescriptor parameterDescriptor) +62
   System.Web.Mvc.ControllerActionInvoker.GetParameterValues(ControllerContext controllerContext, ActionDescriptor actionDescriptor) +105
   System.Web.Mvc.Async.&lt;&gt;c__DisplayClass21.&lt;BeginInvokeAction&gt;b__19(AsyncCallback asyncCallback, Object asyncState) +743
   System.Web.Mvc.Async.WrappedAsyncResult`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +14
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
   System.Web.Mvc.Async.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state) +343
   System.Web.Mvc.Controller.&lt;BeginExecuteCore&gt;b__1c(AsyncCallback asyncCallback, Object asyncState, ExecuteCoreState innerState) +25
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +30
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
   System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state) +465
   System.Web.Mvc.Controller.&lt;BeginExecute&gt;b__14(AsyncCallback asyncCallback, Object callbackState, Controller controller) +18
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +20
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
   System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +374
   System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +16
   System.Web.Mvc.MvcHandler.&lt;BeginProcessRequest&gt;b__4(AsyncCallback asyncCallback, Object asyncState, ProcessRequestState innerState) +52
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +30
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +128
   System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +384
   System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +48
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +16
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +103
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +48
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +159
</pre>
                        </code>
                    </td>
                </tr>
            </table>
            <br>
            <hr width=100% size=1 color=silver>
            <b>Version Information:</b>&nbsp;Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3062.0

谢谢。

Answer 1

您是否尝试在您的网络配置的 appsetting 下添加 MaxJsonDeserializerMembers？像这样，至少对我有用

  <appSettings>
    <add key="aspnet:MaxJsonDeserializerMembers" value="1500000" />
  </appSettings>

Answer 2

我是这样用的

上一个方法

[HttpPost]
public object postDataForSync(string syncData_)
{
}

更新方法

[HttpPost]
public object postDataForSync()
{
 Stream req = Request.InputStream;
 req.Seek(0, System.IO.SeekOrigin.Begin);
 string json = new StreamReader(req).ReadToEnd();
 MyModel model = JsonConvert.DeserializeObject<MyModel>(json);
}

这个 SO Answer 帮助我解决了这个问题。 - SO

ASP.Net WEB API 失败 POST 来自移动设备的大量 JSON 数据

ASP.Net WEB API Failing POST Large JSON data from Mobile

c#

asp.net

asp.net-mvc

asp.net-mvc-4

asp.net-web-api