MVC에서 JSON 길이에러날때

 

출처 - http://brianreiter.org/2011/01/03/custom-jsonresult-class-for-asp-net-mvc-to-avoid-maxjsonlength-exceeded-exception/

 

 

 

LargeJsonResult ActionResult class

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using System; using System.Web.Script.Serialization; 
 namespace System.Web.Mvc 
{ 
    public class LargeJsonResult : JsonResult 
    { 
        const string JsonRequest_GetNotAllowed = "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."; 
        public LargeJsonResult() 
        { 
            MaxJsonLength = 1024000; 
            RecursionLimit = 100; 
        } 
  
        public int MaxJsonLength { get; set; } 
        public int RecursionLimit { get; set; } 
  
        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( JsonRequest_GetNotAllowed ); 
            } 
  
            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() { MaxJsonLength = MaxJsonLength, RecursionLimit = RecursionLimit }; 
                response.Write( serializer.Serialize( Data ) ); 
            } 
        } 
    } 
}

You can use return new LargeJsonResult(){ Data = data } from any Action method where you would have used return Json(data). Also, you have direct control over the MaxJsonLength and RecursionLimit properites of JavaScriptSerializer.

1
return new LargeJsonResult() { Data = output, MaxJsonLength = int.MaxValue };