字符串的长度超过了在mvc中的maxjsonlength属性上设置的值 [英] the length of the string exceeds the value set on the maxjsonlength property in mvc
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问题描述
我正在使用ajax调用来获取车辆旅行详细信息.因此，当从控制器返回行程详细信息以查看时，出现错误字符串的长度超过了在maxjsonlength属性上设置的值".
I am using ajax call to get vehicle trip details . So while returning trip details from controller to view I am getting the error "the length of the string exceeds the value set on the maxjsonlength property".
下面给出的是我用来获取旅行详细信息的ajax调用.每当旅行细节很大时，它都会进入错误功能.
below given is the ajax call i am using to get trip details. Whenever the trip details are huge its going to the error function .
function LoadTripModalWindow(masterID, headwayPlanID, version, specialDay, applicableDay) {
//change this value after cpp service implementation
//version = 1;
/////////////////
if (headwayPlanID == 0 || headwayPlanID == null) {
$('#HeadwayPopUp').hide();
$('#NoTripGenerated').hide();
$('#NoHeadwayPopUp').show();
}
else {
$('#tripDialogDiv').hide();
$('#NoHeadwayPopUp').hide();
$.blockUI({ message: $('#msthrobber') });
var tripIn = '';
tripIn = '<table class="table table-bordered trip" id="tripInTableMS"> </table>';
$("#tripInTableMS").remove();
$("#TripIn").append(tripIn);
var tripOut = '';
tripOut = '<table class="table table-bordered trip" id="tripOutTableMS"> </table>';
$("#tripOutTableMS").remove();
$("#TripOut").append(tripOut);
$.ajax({
type: "GET",
url: "/ScheduleManagement/MasterConfiguration/GetTripTableDetails/",
data: { version: version, masterScheduleID: masterID, headwayPlanId: headwayPlanID, applicableDay: applicableDay, specialDay: specialDay },
dataType: "json",
context: this,
success: function (data) {
var returnedData = JSON.parse(data);
var tripIn = returnedData.TripIn;
var tripOut = returnedData.TripOut;
var TripInHeadwayPlan = returnedData.TripInHeadwayPlan;
var TripOutHeadwayPlan = returnedData.TripOutHeadwayPlan;
var TripInRoute = returnedData.TripInRoute;
var TripOutRoute = returnedData.TripOutRoute;
var ShiftDetails = returnedData.AssignedShifts;
if ((tripIn == null || tripIn.length == 0) && (tripOut == null || tripOut.length == 0)) {
//if (tripIn == null && tripOut == null) {
$.unblockUI();
$('#tripDialogDiv').show();
$('#HeadwayPopUp').hide();
$('#NoTripGenerated').show();
}
else {
var shiftDetail = '<label"> Shift Details :</label> ';
for (var s = 0; s < ShiftDetails.length; s++) {
shiftDetail += ' <input type="text" class="shift-details Shift' + (parseInt(s) + 1) + ' " disabled>' +
'<label style="color: slategrey;">' + ShiftDetails[s].shiftName + '(' + ShiftDetails[s].startTime.substring(0, 5) + ' - ' + ShiftDetails[s].endTime.substring(0, 5) + ')</label> ';
}
$("#ShiftDetails").html('');
$("#ShiftDetails").append(shiftDetail);
if (tripIn != null) {
var tripInTable = new triptable('tripInTableMS', '0', 'btnAddCol1', 'btnTripSave', 'btnTrip1Remove', tripIn, TripInHeadwayPlan, TripInRoute, TripOutRoute, ShiftDetails);
}
if (tripOut != null) {
var tripOutTable = new triptable('tripOutTableMS', '1', 'btnAddCol2', 'btnTripSave', 'btnTrip2Remove', tripOut, TripOutHeadwayPlan, TripInRoute, TripOutRoute, ShiftDetails);
}
$.unblockUI();
$('#tripDialogDiv').show();
$('#HeadwayPopUp').show();
$('#NoTripGenerated').hide();
$("#TripInBox").show();
$("#TripOutBox").hide();
}
},
error: function (response) {
alert("error : " + response);
}
});
}
}我在应用程序中添加了以下代码.
I have added below code in my application.
private static void AddToBackingStore(JsonDotNetValueProviderFactory.EntryLimitedDictionary backingStore, string prefix, object value)
{
IDictionary<string, object> dictionary = value as IDictionary<string, object>;
if (dictionary != null)
{
foreach (KeyValuePair<string, object> keyValuePair in (IEnumerable<KeyValuePair<string, object>>)dictionary)
JsonDotNetValueProviderFactory.AddToBackingStore(backingStore, JsonDotNetValueProviderFactory.MakePropertyKey(prefix, keyValuePair.Key), keyValuePair.Value);
}
else
{
IList list = value as IList;
if (list != null)
{
for (int index = 0; index < list.Count; ++index)
JsonDotNetValueProviderFactory.AddToBackingStore(backingStore, JsonDotNetValueProviderFactory.MakeArrayKey(prefix, index), list[index]);
}
else
backingStore.Add(prefix, value);
}
}
private static object GetDeserializedObject(ControllerContext controllerContext)
{
if (!controllerContext.HttpContext.Request.ContentType.StartsWith("application/json", StringComparison.OrdinalIgnoreCase))
return (object)null;
string end = new StreamReader(controllerContext.HttpContext.Request.InputStream).ReadToEnd();
if (string.IsNullOrEmpty(end))
return (object)null;
var serializer = new JavaScriptSerializer { MaxJsonLength = Int32.MaxValue };
return serializer.DeserializeObject(end);
}
public override IValueProvider GetValueProvider(ControllerContext controllerContext)
{
if (controllerContext == null)
throw new ArgumentNullException("controllerContext");
object deserializedObject = JsonDotNetValueProviderFactory.GetDeserializedObject(controllerContext);
if (deserializedObject == null)
return (IValueProvider)null;
Dictionary<string, object> dictionary = new Dictionary<string, object>((IEqualityComparer<string>)StringComparer.OrdinalIgnoreCase);
JsonDotNetValueProviderFactory.AddToBackingStore(new JsonDotNetValueProviderFactory.EntryLimitedDictionary((IDictionary<string, object>)dictionary), string.Empty, deserializedObject);
return (IValueProvider)new DictionaryValueProvider<object>((IDictionary<string, object>)dictionary, CultureInfo.CurrentCulture);
}
private static string MakeArrayKey(string prefix, int index)
{
return prefix + "[" + index.ToString((IFormatProvider)CultureInfo.InvariantCulture) + "]";
}
private static string MakePropertyKey(string prefix, string propertyName)
{
if (!string.IsNullOrEmpty(prefix))
return prefix + "." + propertyName;
return propertyName;
}
private class EntryLimitedDictionary
{
private static int _maximumDepth = JsonDotNetValueProviderFactory.EntryLimitedDictionary.GetMaximumDepth();
private readonly IDictionary<string, object> _innerDictionary;
private int _itemCount;
public EntryLimitedDictionary(IDictionary<string, object> innerDictionary)
{
this._innerDictionary = innerDictionary;
}
public void Add(string key, object value)
{
if (++this._itemCount > JsonDotNetValueProviderFactory.EntryLimitedDictionary._maximumDepth)
throw new InvalidOperationException("JsonValueProviderFactory_RequestTooLarge");
this._innerDictionary.Add(key, value);
}
private static int GetMaximumDepth()
{
NameValueCollection appSettings = ConfigurationManager.AppSettings;
if (appSettings != null)
{
string[] values = appSettings.GetValues("aspnet:MaxJsonDeserializerMembers");
int result;
if (values != null && values.Length > 0 && int.TryParse(values[0], out result))
return result;
}
return 1000;
}
}在global.ascx文件中，我在以下几行中添加了
And in global.ascx file I have added below lines
foreach (var factory in ValueProviderFactories.Factories)
{
if (factory.GetType().FullName == "System.Web.Mvc.JsonValueProviderFactory")
{
jsonFactory = factory;
break;
}
}
if (jsonFactory != null)
{
ValueProviderFactories.Factories.Remove(jsonFactory);
}
ValueProviderFactories.Factories.Add(new JsonDotNetValueProviderFactory());几个月来一切正常.现在，数据长度再次增加，并再次开始出现错误.
It was working fine for few months. Now again the data length increased and started to getting the error again.
请让我知道是否有人有解决此问题的建议.
Please let me know if anybody have any suggestion to solve this issue.
推荐答案
Json结果具有一些默认长度.每当它超出时，它就会抛出错误.
Json result have some default length. Whenever it exceeds, it throw above error.
为此，您有2种方法，要么在web.config中添加长度，要么在返回操作方法定义长度的同时.
For this you have 2 approach either add length in web.config or while return your action method define length.
用于 Web.config
<configuration>
<system.web.extensions>
<scripting>
<webServices>
<jsonSerialization maxJsonLength="50000000"/>
</webServices>
</scripting>
</system.web.extensions>
</configuration>
或在Controller方法中返回jsonresult时，将返回长度定义为字符串的最大长度.
or while return jsonresult in Controller method, define return length as max length of your string.
return new JsonResult()
{
ContentEncoding = Encoding.Default,
ContentType = "application/json",
Data = data,
JsonRequestBehavior = requestBehavior,
MaxJsonLength = int.MaxValue
};
请参阅字符串的长度超过在maxJsonLength属性上设置的值
我是否可以为要在web.config中使用maxJsonLength吗?
这篇关于字符串的长度超过了在mvc中的maxjsonlength属性上设置的值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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