NET中使用Jayrock不正确地形成JSON字符串

Question

I am trying to return a JSON object from an aspx page using Jayrock.JSON. My code for writing it out is this:

using (JsonTextWriter writer = new JsonTextWriter(Response.Output))
    {
        writer.WriteStartObject();
        for (int i = 0; i < rdr.FieldCount; i++)
        {
            writer.WriteMember(rdr.GetName(i).ToString());
            writer.WriteString(rdr[i].ToString());
        }
        writer.WriteEndObject();
    }

This is inside of an rdr.Read() loop.

The outputted JSON looks like this: (though I added the line breaks manually)

{
"BugID":"1087",
"AddedBy":"",
"BugDate":"5/2/2010 9:45:34 AM",
"BugTitle":"/admin/ajax_thirdpartylog.asp",
"Classify":""
,"ErrPage":"/admin/ajax_thirdpartylog.asp",
"StoreID":"71",
"UserID":"15438",
"ErrDesc":"Type mismatch: 'formatnumber'",
"ErrDump":"*** VARIABLES DUMP ***\r\n\r\n*** Form Variables ***\r\n\r\ncalmonth : 8\r\ncalmonth2 : 8\r\nfromdate : 8/1/2009\r\ncalyear : 2009\r\ntodate : 8/31/2009\r\ncalyear2 : 2009\r\nr : 978402\r\nthirdtype : 1\r\nButton : Generate Third Party Log\r\n\r\n*** Query String Variables ***\r\n\r\n\r\n\r\n*** REPORT END ***\r\n",
"ErrLine":"74",
"DateFixed":"",
"Counter":"16",
"AssignTo":""
 }
 {
"BugID":"1086",
"AddedBy":"",
"BugDate":"5/1/2010 11:58:54 PM",
"BugTitle":"/admin/Charts/monthsales_s.asp",
"Classify":"",
"ErrPage":"/admin/Charts/monthsales_s.asp",
"StoreID":"402",
"UserID":"141928",
"ErrDesc":"Script timed out",
"ErrDump":"*** VARIABLES DUMP ***\r\n\r\n*** Form Variables ***\r\n\r\n\r\n*** Query String Variables ***\r\n\r\nmonth1 : 9/1/2009\r\nr : 75333803\r\n\r\n\r\n*** REPORT END ***\r\n",
"ErrLine":"0",
"DateFixed":"",
"Counter":"",
"AssignTo":""
 }

I'm not really sure what I'm doing wrong, but on my page reading this JSON, when I try to do .evalJSON (using prototypejs) I get errors saying that the JSON is malformed. Can anyone advise me what to change?

Answer 1

This:

"AssignTo":"" 
 } 
 { 

is the invalid JSON. You can a string to see if it's valid JSON at JSON Lint . I'm not sure what this should be like, but an empty object would be like this (don't need "", brackets reversed, missing comma):

"AssignTo": 
 { 
 }, 

Answer 2

The problem is that you are writing multiple JSON objects whereas what you are probably trying to do is produce a JSON array of JSON objects. Given your code snippet, I'm assuming rdr holds some IDataReader implementation like SqlDataReader . If that's true then you need to modify your code to start and end a JSON array around the outer read loop, as follows:

using (JsonTextWriter writer = new JsonTextWriter(Response.Output))
{        
    writer.WriteStartArray();
    while (rdr.Read())
    {
        writer.WriteStartObject();
        for (int i = 0; i < rdr.FieldCount; i++)
        {
            writer.WriteMember(rdr.GetName(i).ToString());
            writer.WriteString(rdr[i].ToString());
        }
        writer.WriteEndObject();
    }
    writer.WriteEndArray();
}

Jayrock will automatically delimit each JSON object value with a comma (,) when inside a JSON array so now the output should resemble the following and valid JSON:

[
    {
        "BugID":"1087",
        "AddedBy":"",
        "BugDate":"5/2/2010 9:45:34 AM",
        "BugTitle":"/admin/ajax_thirdpartylog.asp",
        "Classify":""
        ,"ErrPage":"/admin/ajax_thirdpartylog.asp",
        "StoreID":"71",
        "UserID":"15438",
        "ErrDesc":"Type mismatch: 'formatnumber'",
        "ErrDump":"*** VARIABLES DUMP ***\r\n\r\n*** Form Variables ***\r\n\r\ncalmonth : 8\r\ncalmonth2 : 8\r\nfromdate : 8/1/2009\r\ncalyear : 2009\r\ntodate : 8/31/2009\r\ncalyear2 : 2009\r\nr : 978402\r\nthirdtype : 1\r\nButton : Generate Third Party Log\r\n\r\n*** Query String Variables ***\r\n\r\n\r\n\r\n*** REPORT END ***\r\n",
        "ErrLine":"74",
        "DateFixed":"",
        "Counter":"16",
        "AssignTo":""
    },
    {
        "BugID":"1086",
        "AddedBy":"",
        "BugDate":"5/1/2010 11:58:54 PM",
        "BugTitle":"/admin/Charts/monthsales_s.asp",
        "Classify":"",
        "ErrPage":"/admin/Charts/monthsales_s.asp",
        "StoreID":"402",
        "UserID":"141928",
        "ErrDesc":"Script timed out",
        "ErrDump":"*** VARIABLES DUMP ***\r\n\r\n*** Form Variables ***\r\n\r\n\r\n*** Query String Variables ***\r\n\r\nmonth1 : 9/1/2009\r\nr : 75333803\r\n\r\n\r\n*** REPORT END ***\r\n",
        "ErrLine":"0",
        "DateFixed":"",
        "Counter":"",
        "AssignTo":""
    }
]