blocks|key|2830088|text|在ASP.Net+MVC4中，JsonResult类中使用的默认JavaScript序列化程序仍然是JavaScriptSerializer+(您可以在code中检查它)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2830089|我认为您将其与ASP.Net+Web.API混淆了，其中JSON.Net是默认的JS序列化程序，但MVC4不使用它。|2830090|所以你需要配置JSON.Net来使用MVC4+(基本上你需要创建你自己的JsonNetResult)，有很多关于它的文章：|2830091|2830092|ASP.NET+MVC+and+Json.NET|unordered-list-item|2830093|Using+JSON.NET+as+the+default+JSON+serializer+in+ASP.NET+MVC+3+-+is+it+possible?|2830094|2830095|如果您还想在模型绑定期间为控制器操作参数使用JSON.Net，那么您需要编写自己的ValueProviderFactory实现。|2830096|并且您需要向以下位置注册您的实现：|2830097|ValueProviderFactories.Factories
++++.Remove(ValueProviderFactories.Factories
++++++++++++++++++++++++++++++++++.OfType<JsonValueProviderFactory>().Single());
ValueProviderFactories.Factories.Add(new+MyJsonValueProviderFactory());|code-block|syntax|javascript|2830098|您可以使用内置的JsonValueProviderFactory作为示例，或者阅读本文：ASP.NET+MVC+3+–+Improved+JsonValueProviderFactory+using+Json.Net|2830099|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.web.script.serialization.javascriptserializer.aspx|1|http://aspnetwebstack.codeplex.com/SourceControl/changeset/view/5cb74eb3b2f3#src/System.Web.Mvc/JsonResult.cs|2|http://james.newtonking.com/archive/2008/10/16/asp-net-mvc-and-json-net.aspx|3|https://stackoverflow.com/questions/7109967/using-json-net-as-default-json-serializer-in-asp-net-mvc-3-is-it-possible|4|http://www.dalsoft.co.uk/blog/index.php/2012/01/10/asp-net-mvc-3-improved-jsonvalueproviderfactory-using-json-net/^0|F|A|1E|K|0|24|4|1|0|0|10|D|0|0|0|O|2|0|0|28|3|0|0|15|K|0|0|0|8|O|18|1S|4|0^^$0|@$1|2|3|4|5|6|7|1H|8|@$9|1I|A|1J|B|C]]|D|@$9|1K|A|1L|1|1M]|$9|1N|A|1O|1|1P]]|E|$]]|$1|F|3|G|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1R|8|@$9|1S|A|1T|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|1U|8|@]|D|@]|E|$]]|$1|K|3|L|5|M|7|1V|8|@]|D|@$9|1W|A|1X|1|1Y]]|E|$]]|$1|N|3|O|5|M|7|1Z|8|@]|D|@$9|20|A|21|1|22]]|E|$]]|$1|P|3|-4|5|6|7|23|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|24|8|@$9|25|A|26|B|C]]|D|@]|E|$]]|$1|S|3|T|5|6|7|27|8|@]|D|@]|E|$]]|$1|U|3|V|5|W|7|28|8|@]|D|@]|E|$X|Y]]|$1|Z|3|10|5|6|7|29|8|@$9|2A|A|2B|B|C]]|D|@$9|2C|A|2D|1|2E]]|E|$]]|$1|11|3|-4|5|6|7|2F|8|@]|D|@]|E|$]]]|12|$13|$5|14|15|16|E|$17|18]]|19|$5|14|15|16|E|$17|1A]]|1B|$5|14|15|16|E|$17|1C]]|1D|$5|14|15|16|E|$17|1E]]|1F|$5|14|15|16|E|$17|1G]]]]

In ASP.Net MVC4 the default JavaScript serializer which is used in the <code>JsonResult</code> class is still the <a href="http://msdn.microsoft.com/en-us/library/system.web.script.serialization.javascriptserializer.aspx" rel="noreferrer">JavaScriptSerializer</a> (you can check it in the <a href="http://aspnetwebstack.codeplex.com/SourceControl/changeset/view/5cb74eb3b2f3#src/System.Web.Mvc/JsonResult.cs" rel="noreferrer">code</a>)

I think you have confused it with the ASP.Net Web.API where JSON.Net is the default JS serializer but MVC4 doesn't use it.

So you need to configure JSON.Net to work with MVC4 (basically you need to create your own <code>JsonNetResult</code>), there are plenty of articles about it:

<ul>
<li><a href="http://james.newtonking.com/archive/2008/10/16/asp-net-mvc-and-json-net.aspx" rel="noreferrer">ASP.NET MVC and Json.NET</a></li>
<li><a href="https://stackoverflow.com/questions/7109967/using-json-net-as-default-json-serializer-in-asp-net-mvc-3-is-it-possible">Using JSON.NET as the default JSON serializer in ASP.NET MVC 3 - is it possible?</a></li>
</ul>

If you also want to use JSON.Net for controller action parameters so during the model binding then you need write your own <code>ValueProviderFactory</code> implementation. 

And you need to register your implementation with: 

<pre><code>ValueProviderFactories.Factories
 .Remove(ValueProviderFactories.Factories
 .OfType&lt;JsonValueProviderFactory&gt;().Single());
ValueProviderFactories.Factories.Add(new MyJsonValueProviderFactory());
</code></pre>

You can use the built in <code>JsonValueProviderFactory</code> as an example or this article: <a href="http://www.dalsoft.co.uk/blog/index.php/2012/01/10/asp-net-mvc-3-improved-jsonvalueproviderfactory-using-json-net/" rel="noreferrer">ASP.NET MVC 3 – Improved JsonValueProviderFactory using Json.Net</a>

blocks|key|3042656|text|ASP.NET+MVC+5修复：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3042657|我还没有准备好更改到Json.NET，在我的例子中，错误发生在请求过程中。在我的场景中，最好的方法是修改实际的JsonValueProviderFactory，这将修复应用到全局项目，并且可以通过编辑global.cs文件来完成。|CODE|3042658|JsonValueProviderConfig.Config(ValueProviderFactories.Factories);|code-block|syntax|javascript|3042659|添加web.config条目：|3042660|<add+key="aspnet:MaxJsonLength"+value="20971520"+/>|3042661|然后创建以下两个类|3042662|public+class+JsonValueProviderConfig
{
++++public+static+void+Config(ValueProviderFactoryCollection+factories)
++++{
++++++++var+jsonProviderFactory+=+factories.OfType<JsonValueProviderFactory>().Single();
++++++++factories.Remove(jsonProviderFactory);
++++++++factories.Add(new+CustomJsonValueProviderFactory());
++++}
}|3042663|这基本上是System.Web.Mvc中默认实现的精确副本，但增加了一个可配置的web.config应用设置值aspnet:MaxJsonLength。|3042664|public+class+CustomJsonValueProviderFactory+:+ValueProviderFactory
{

++++///+<summary>Returns+a+JSON+value-provider+object+for+the+specified+controller+context.</summary>
++++///+<returns>A+JSON+value-provider+object+for+the+specified+controller+context.</returns>
++++///+<param+name="controllerContext">The+controller+context.</param>
++++public+override+IValueProvider+GetValueProvider(ControllerContext+controllerContext)
++++{
++++++++if+(controllerContext+==+null)
++++++++++++throw+new+ArgumentNullException("controllerContext");

++++++++object+deserializedObject+=+CustomJsonValueProviderFactory.GetDeserializedObject(controllerContext);
++++++++if+(deserializedObject+==+null)
++++++++++++return+null;

++++++++Dictionary<string,+object>+strs+=+new+Dictionary<string,+object>(StringComparer.OrdinalIgnoreCase);
++++++++CustomJsonValueProviderFactory.AddToBackingStore(new+CustomJsonValueProviderFactory.EntryLimitedDictionary(strs),+string.Empty,+deserializedObject);

++++++++return+new+DictionaryValueProvider<object>(strs,+CultureInfo.CurrentCulture);
++++}

++++private+static+object+GetDeserializedObject(ControllerContext+controllerContext)
++++{
++++++++if+(!controllerContext.HttpContext.Request.ContentType.StartsWith("application/json",+StringComparison.OrdinalIgnoreCase))
++++++++++++return+null;

++++++++string+fullStreamString+=+(new+StreamReader(controllerContext.HttpContext.Request.InputStream)).ReadToEnd();
++++++++if+(string.IsNullOrEmpty(fullStreamString))
++++++++++++return+null;

++++++++var+serializer+=+new+JavaScriptSerializer()
++++++++{
++++++++++++MaxJsonLength+=+CustomJsonValueProviderFactory.GetMaxJsonLength()
++++++++};
++++++++return+serializer.DeserializeObject(fullStreamString);
++++}

++++private+static+void+AddToBackingStore(EntryLimitedDictionary+backingStore,+string+prefix,+object+value)
++++{
++++++++IDictionary<string,+object>+strs+=+value+as+IDictionary<string,+object>;
++++++++if+(strs+!=+null)
++++++++{
++++++++++++foreach+(KeyValuePair<string,+object>+keyValuePair+in+strs)
++++++++++++++++CustomJsonValueProviderFactory.AddToBackingStore(backingStore,+CustomJsonValueProviderFactory.MakePropertyKey(prefix,+keyValuePair.Key),+keyValuePair.Value);

++++++++++++return;
++++++++}

++++++++IList+lists+=+value+as+IList;
++++++++if+(lists+==+null)
++++++++{
++++++++++++backingStore.Add(prefix,+value);
++++++++++++return;
++++++++}

++++++++for+(int+i+=+0;+i+<+lists.Count;+i%2B%2B)
++++++++{
++++++++++++CustomJsonValueProviderFactory.AddToBackingStore(backingStore,+CustomJsonValueProviderFactory.MakeArrayKey(prefix,+i),+lists[i]);
++++++++}
++++}

++++private+class+EntryLimitedDictionary
++++{
++++++++private+static+int+_maximumDepth;

++++++++private+readonly+IDictionary<string,+object>+_innerDictionary;

++++++++private+int+_itemCount;

++++++++static+EntryLimitedDictionary()
++++++++{
++++++++++++_maximumDepth+=+CustomJsonValueProviderFactory.GetMaximumDepth();
++++++++}

++++++++public+EntryLimitedDictionary(IDictionary<string,+object>+innerDictionary)
++++++++{
++++++++++++this._innerDictionary+=+innerDictionary;
++++++++}

++++++++public+void+Add(string+key,+object+value)
++++++++{
++++++++++++int+num+=+this._itemCount+%2B+1;
++++++++++++this._itemCount+=+num;
++++++++++++if+(num+>+_maximumDepth)
++++++++++++{
++++++++++++++++throw+new+InvalidOperationException("The+length+of+the+string+exceeds+the+value+set+on+the+maxJsonLength+property.");
++++++++++++}
++++++++++++this._innerDictionary.Add(key,+value);
++++++++}
++++}

++++private+static+string+MakeArrayKey(string+prefix,+int+index)
++++{
++++++++return+string.Concat(prefix,+"[",+index.ToString(CultureInfo.InvariantCulture),+"]");
++++}

++++private+static+string+MakePropertyKey(string+prefix,+string+propertyName)
++++{
++++++++if+(string.IsNullOrEmpty(prefix))
++++++++{
++++++++++++return+propertyName;
++++++++}
++++++++return+string.Concat(prefix,+".",+propertyName);
++++}

++++private+static+int+GetMaximumDepth()
++++{
++++++++int+num;
++++++++NameValueCollection+appSettings+=+ConfigurationManager.AppSettings;
++++++++if+(appSettings+!=+null)
++++++++{
++++++++++++string[]+values+=+appSettings.GetValues("aspnet:MaxJsonDeserializerMembers");
++++++++++++if+(values+!=+null+&&+values.Length+!=+0+&&+int.TryParse(values[0],+out+num))
++++++++++++{
++++++++++++++++return+num;
++++++++++++}
++++++++}
++++++++return+1000;
++++}

++++private+static+int+GetMaxJsonLength()
++++{
++++++++int+num;
++++++++NameValueCollection+appSettings+=+ConfigurationManager.AppSettings;
++++++++if+(appSettings+!=+null)
++++++++{
++++++++++++string[]+values+=+appSettings.GetValues("aspnet:MaxJsonLength");
++++++++++++if+(values+!=+null+&&+values.Length+!=+0+&&+int.TryParse(values[0],+out+num))
++++++++++++{
++++++++++++++++return+num;
++++++++++++}
++++++++}
++++++++return+1000;
++++}
}|3042665|entityMap^0|0|G|0|1J|O|2S|9|0|0|0|0|0|0|5|E|1J|K|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|14|8|@$9|15|A|16|B|H]|$9|17|A|18|B|H]]|D|@]|E|$]]|$1|I|3|J|5|K|7|19|8|@]|D|@]|E|$L|M]]|$1|N|3|O|5|6|7|1A|8|@]|D|@]|E|$]]|$1|P|3|Q|5|K|7|1B|8|@]|D|@]|E|$L|M]]|$1|R|3|S|5|6|7|1C|8|@]|D|@]|E|$]]|$1|T|3|U|5|K|7|1D|8|@]|D|@]|E|$L|M]]|$1|V|3|W|5|6|7|1E|8|@$9|1F|A|1G|B|H]|$9|1H|A|1I|B|H]]|D|@]|E|$]]|$1|X|3|Y|5|K|7|1J|8|@]|D|@]|E|$L|M]]|$1|Z|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|10|$]]

ASP.NET MVC 5 Fix:

I wasn't ready to change to Json.NET just yet and in my case the error was occurring during the request. Best approach in my scenario was modifying the actual <code>JsonValueProviderFactory</code> which applies the fix to the global project and can be done by editing the <code>global.cs</code> file as such.

<pre><code>JsonValueProviderConfig.Config(ValueProviderFactories.Factories);
</code></pre>

add a web.config entry:

<pre><code>&lt;add key="aspnet:MaxJsonLength" value="20971520" /&gt;
</code></pre>

and then create the two following classes

<pre><code>public class JsonValueProviderConfig
{
 public static void Config(ValueProviderFactoryCollection factories)
 {
 var jsonProviderFactory = factories.OfType&lt;JsonValueProviderFactory&gt;().Single();
 factories.Remove(jsonProviderFactory);
 factories.Add(new CustomJsonValueProviderFactory());
 }
}
</code></pre>

This is basically an exact copy of the default implementation found in <code>System.Web.Mvc</code> but with the addition of a configurable web.config appsetting value <code>aspnet:MaxJsonLength</code>.

<pre><code>public class CustomJsonValueProviderFactory : ValueProviderFactory
{

 /// &lt;summary&gt;Returns a JSON value-provider object for the specified controller context.&lt;/summary&gt;
 /// &lt;returns&gt;A JSON value-provider object for the specified controller context.&lt;/returns&gt;
 /// &lt;param name="controllerContext"&gt;The controller context.&lt;/param&gt;
 public override IValueProvider GetValueProvider(ControllerContext controllerContext)
 {
 if (controllerContext == null)
 throw new ArgumentNullException("controllerContext");

 object deserializedObject = CustomJsonValueProviderFactory.GetDeserializedObject(controllerContext);
 if (deserializedObject == null)
 return null;

 Dictionary&lt;string, object&gt; strs = new Dictionary&lt;string, object&gt;(StringComparer.OrdinalIgnoreCase);
 CustomJsonValueProviderFactory.AddToBackingStore(new CustomJsonValueProviderFactory.EntryLimitedDictionary(strs), string.Empty, deserializedObject);

 return new DictionaryValueProvider&lt;object&gt;(strs, CultureInfo.CurrentCulture);
 }

 private static object GetDeserializedObject(ControllerContext controllerContext)
 {
 if (!controllerContext.HttpContext.Request.ContentType.StartsWith("application/json", StringComparison.OrdinalIgnoreCase))
 return null;

 string fullStreamString = (new StreamReader(controllerContext.HttpContext.Request.InputStream)).ReadToEnd();
 if (string.IsNullOrEmpty(fullStreamString))
 return null;

 var serializer = new JavaScriptSerializer()
 {
 MaxJsonLength = CustomJsonValueProviderFactory.GetMaxJsonLength()
 };
 return serializer.DeserializeObject(fullStreamString);
 }

 private static void AddToBackingStore(EntryLimitedDictionary backingStore, string prefix, object value)
 {
 IDictionary&lt;string, object&gt; strs = value as IDictionary&lt;string, object&gt;;
 if (strs != null)
 {
 foreach (KeyValuePair&lt;string, object&gt; keyValuePair in strs)
 CustomJsonValueProviderFactory.AddToBackingStore(backingStore, CustomJsonValueProviderFactory.MakePropertyKey(prefix, keyValuePair.Key), keyValuePair.Value);

 return;
 }

 IList lists = value as IList;
 if (lists == null)
 {
 backingStore.Add(prefix, value);
 return;
 }

 for (int i = 0; i &lt; lists.Count; i++)
 {
 CustomJsonValueProviderFactory.AddToBackingStore(backingStore, CustomJsonValueProviderFactory.MakeArrayKey(prefix, i), lists[i]);
 }
 }

 private class EntryLimitedDictionary
 {
 private static int _maximumDepth;

 private readonly IDictionary&lt;string, object&gt; _innerDictionary;

 private int _itemCount;

 static EntryLimitedDictionary()
 {
 _maximumDepth = CustomJsonValueProviderFactory.GetMaximumDepth();
 }

 public EntryLimitedDictionary(IDictionary&lt;string, object&gt; innerDictionary)
 {
 this._innerDictionary = innerDictionary;
 }

 public void Add(string key, object value)
 {
 int num = this._itemCount + 1;
 this._itemCount = num;
 if (num &gt; _maximumDepth)
 {
 throw new InvalidOperationException("The length of the string exceeds the value set on the maxJsonLength property.");
 }
 this._innerDictionary.Add(key, value);
 }
 }

 private static string MakeArrayKey(string prefix, int index)
 {
 return string.Concat(prefix, "[", index.ToString(CultureInfo.InvariantCulture), "]");
 }

 private static string MakePropertyKey(string prefix, string propertyName)
 {
 if (string.IsNullOrEmpty(prefix))
 {
 return propertyName;
 }
 return string.Concat(prefix, ".", propertyName);
 }

 private static int GetMaximumDepth()
 {
 int num;
 NameValueCollection appSettings = ConfigurationManager.AppSettings;
 if (appSettings != null)
 {
 string[] values = appSettings.GetValues("aspnet:MaxJsonDeserializerMembers");
 if (values != null &amp;&amp; values.Length != 0 &amp;&amp; int.TryParse(values[0], out num))
 {
 return num;
 }
 }
 return 1000;
 }

 private static int GetMaxJsonLength()
 {
 int num;
 NameValueCollection appSettings = ConfigurationManager.AppSettings;
 if (appSettings != null)
 {
 string[] values = appSettings.GetValues("aspnet:MaxJsonLength");
 if (values != null &amp;&amp; values.Length != 0 &amp;&amp; int.TryParse(values[0], out num))
 {
 return num;
 }
 }
 return 1000;
 }
}
</code></pre>

I'm working on an existing application that has been partially converted over to MVC. Whenever a controller responds with a JSON ActionResult, the enums are sent as numbers opposed to the string name. It sounds like the default serializer should be JSON.Net, which should be sending the enums over as their names opposed to the integer representation, but that's not the case here.

Am I missing a web.config setting that sets this as the default serializer? Or is there another setting that needs to be changed?

Setting the default JSON serializer in ASP.NET MVC

我正在开发一个已部分转换为MVC的现有应用程序。每当控制器使用JSON ActionResult响应时，枚举都是以数字而不是字符串名称的形式发送的。听起来默认的序列化程序应该是JSON.Net，它应该以枚举的名称发送枚举，而不是整数表示，但这里的情况并非如此。我是否缺少将其设置为默认序列化程序的web.config设置...

问在ASP.NET MVC中设置默认的JSON序列化程序
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