在MVC 4中，你可以做:

protected override JsonResult Json(object data, string contentType, System.Text.Encoding contentEncoding, JsonRequestBehavior behavior)
{
    return new JsonResult()
    {
        Data = data,
        ContentType = contentType,
        ContentEncoding = contentEncoding,
        JsonRequestBehavior = behavior,
        MaxJsonLength = Int32.MaxValue
    };
}

在控制器中。

添加:

对于任何对你需要指定的参数感到困惑的人来说，调用可以是这样的:

Json(
    new {
        field1 = true,
        field2 = "value"
        },
    "application/json",
    Encoding.UTF8,
    JsonRequestBehavior.AllowGet
);

我修好了。

//your Json data here
string json_object="........";
JavaScriptSerializer jsJson = new JavaScriptSerializer();
jsJson.MaxJsonLength = 2147483644;
MyClass obj = jsJson.Deserialize<MyClass>(json_object);

它工作得很好。

如果你仍然得到错误后，web。配置设置如下:

<configuration> 
   <system.web.extensions>
       <scripting>
           <webServices>
               <jsonSerialization maxJsonLength="50000000"/>
           </webServices>
       </scripting>
   </system.web.extensions>
</configuration> 

    

我是这样解决的:

   public ActionResult/JsonResult getData()
   {
      var jsonResult = Json(superlargedata, JsonRequestBehavior.AllowGet);
      jsonResult.MaxJsonLength = int.MaxValue;
      return jsonResult;
    }

我希望这能有所帮助。

使用lib \ Newtonsoft.Json.dll

public string serializeObj(dynamic json) {        
    return JsonConvert.SerializeObject(json);
}

您可以在web中配置json请求的最大长度。配置文件:

<configuration>
    <system.web.extensions>
        <scripting>
            <webServices>
                <jsonSerialization maxJsonLength="....">
                </jsonSerialization>
            </webServices>
        </scripting>
    </system.web.extensions>
</configuration>

maxJsonLength的缺省值是102400。更多详细信息，请参见MSDN页面:http://msdn.microsoft.com/en-us/library/bb763183.aspx

来点属性魔法怎么样?

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true, AllowMultiple = false)]
public class MaxJsonSizeAttribute : ActionFilterAttribute
{
    // Default: 10 MB worth of one byte chars
    private int maxLength = 10 * 1024 * 1024;

    public int MaxLength
    {
        set
        {
            if (value < 0) throw new ArgumentOutOfRangeException("value", "Value must be at least 0.");

            maxLength = value;
        }
        get { return maxLength; }
    }

    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        JsonResult json = filterContext.Result as JsonResult;
        if (json != null)
        {
            if (maxLength == 0)
            {
                json.MaxJsonLength = int.MaxValue;
            }
            else
            {
                json.MaxJsonLength = maxLength;
            }
        }
    }
}

然后，您可以使用全局过滤器配置或控制器/动作在全局中应用它。