異常信息如下：

使用?JSON?JavaScriptSerializer?進(jìn)行序列化或反序列化時(shí)出錯(cuò)。字符串的長度超過了為?maxJsonLength?屬性設(shè)置的值。 這個(gè)異常是在執(zhí)行MVC中的JsonResult的時(shí)拋出的，根據(jù)異常的Message得知是序列化的字符串超出了maxJsonLength的限制。并得知這個(gè)屬性是由JavaScriptSerializer提供的，因?yàn)镸VC內(nèi)置的JsonResult是用JavaScriptSerializer進(jìn)行序列化的。 單純在web.config中加入下列配置節(jié)無效： <system.web.extensions><scripting><webServices><jsonSerialization maxJsonLength="20971520"/></webServices></scripting> </system.web.extensions>

?

還必須重寫JsonResult這個(gè)類：

ConfigurableJsonResult public class ConfigurableJsonResult : JsonResult{public override void ExecuteResult(ControllerContext context){if (context == null){throw new ArgumentNullException("context");}if (JsonRequestBehavior == JsonRequestBehavior.DenyGet &&String.Equals(context.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase)){throw new InvalidOperationException("This request has been blocked because sensitive information could be disclosed to third party web sites when this is used in a GET request. To allow GET requests, set JsonRequestBehavior to AllowGet.");}HttpResponseBase response = context.HttpContext.Response;if (!String.IsNullOrEmpty(ContentType)){response.ContentType = ContentType;}else{response.ContentType = "application/json";}if (ContentEncoding != null){response.ContentEncoding = ContentEncoding;}if (Data != null){JavaScriptSerializer serializer = new JavaScriptSerializer();ScriptingJsonSerializationSection section = ConfigurationManager.GetSection("system.web.extensions/scripting/webServices/jsonSerialization") as ScriptingJsonSerializationSection;if (section != null){serializer.MaxJsonLength = section.MaxJsonLength;serializer.RecursionLimit = section.RecursionLimit;}response.Write(serializer.Serialize(Data));}}}

?

?

測試后可以正常使用。

?

參考：

http://www.cnblogs.com/shenba/archive/2012/02/03/2337050.html

http://weblogs.asp.net/rashid/archive/2009/03/23/submitting-my-first-bug-after-asp-net-mvc-1-0-rtm-release.aspx

轉(zhuǎn)載于:https://www.cnblogs.com/sherlock99/p/3659759.html

總結(jié)

以上是生活随笔為你收集整理的MVC中JSON字符长度超出限制的异常处理的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。