C#: Json validation from user input

Question

I need to validate a json file from server side, Im using asp.net mvc with c#, so I have this method in my controller

public ActionResult Validate(HttpPostedFileBase jsonFile) 
    {
        bool validJson = false;
        var serializer = new JavaScriptSerializer();

        try 
        {
            var result = serializer.Deserialize<Dictionary<string, object>>(How should I pass the json file here ??);
            validJson = true;
        } 
        catch(Exception ex)
        {
            validJson = false;
        }

    }

This is the best way for validate it ? ... sorry but I don't know how to pass the json string parameter, I have tried with jsonFile.InputStream.ToString(), jsonFile.tostring() ... what it needs ?, json user's route ? ... thanks in advance

Dimitar Dimitrov · Accepted Answer · 2013-05-19 07:06:47Z

1

Well how about something like this:

using (var reader = new StreamReader(jsonFile.InputStream))
{
    string jsonData = reader.ReadToEnd();
    var serializer = new JavaScriptSerializer();

    var result = serializer.Deserialize<Dictionary<string, object>>(jsonData);
    // dragons be here ...
}

answered May 19, 2013 at 7:06

Dimitar Dimitrov

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4 Comments

Steve Over a year ago

could you explain to me please, why after using command, I try to save my file and It´s empty, after validate json I need to save some records in db and after all, save my file. But It's only working inside using, and I need it after it ... thank you

Dimitar Dimitrov Over a year ago

You need to save the JSON like: jsonFile.SaveAs("c:\\fullfilepath");

Steve Over a year ago

Ok that's exactly what I'm doing but I always get and empty file, I'm trying without those lines and It saves good. I need to save it inside using tag ?

Dimitar Dimitrov Over a year ago

Hmmm, not sure, basically it's disposing of the StreamReader, I'm surprised it's affecting the original InputStream. I'll run some tests.

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