Question

我从控制器操作返回json结果，结果包括二进制图像，我想使用javascript在视图中显示它。但它显示Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property.

在页面加载时使用Ajax调用的操作

public ActionResult LoadBooks()
    {          
            var v = from t in db.BookTbls
                    where t.IsDisplay==true
                    select new BookVM
                    {
                        BookID=t.BookID,
                        BookName=t.BookName,
                        BookPrize=t.BookPrize,
                        BookImagepath=t.BookImagepath,
                        BinaryImage=t.BinaryImage
                    };

            List<BookVM> list = new List<BookVM>();
            foreach(var temp in v.ToList())
            {
                BookVM obj = new BookVM();
                obj.BookID = temp.BookID;
                obj.BookName = temp.BookName;
                obj.BookPrize = temp.BookPrize;
                obj.BookImagepath = temp.BookImagepath;
                var base64 = Convert.ToBase64String(temp.BinaryImage);
                var imgsrc = string.Format("data:image/jpg;base64,{0}", base64);
                obj.BImage = imgsrc;//BImage is string variable from model
                list.Add(obj);
            }          
            return Json(v.OrderBy(p => p.BookName).ToList(), JsonRequestBehavior.AllowGet);
        }

简而言之，我只是希望看到结果，它甚至没有成功（结果）只是显示上面提到的控制台错误。

Answer 1

欢迎使用Stackoverflow

MaxJsonLength属性不能是无限的，它是一个整数属性，默认为102400（100k）。

您可以在web.config上设置MaxJsonLength属性：我认为您可以拥有的最大值是2147483644。

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

作为解决方法，您可以在Controller内（或在任何实际位置）执行以下操作：

var serializer = new JavaScriptSerializer();

// For simplicity just use Int32's max value.
// You could always read the value from the config section mentioned above.
serializer.MaxJsonLength = Int32.MaxValue;

var resultData = new { Value = "foo", Text = "var" };
var result = new ContentResult{
    Content = serializer.Serialize(resultData),
    ContentType = "application/json"
};
return result;

Mirosoft Documentation.

在json结果中返回二进制图像显示序列化错误

1 个答案: