C# .Net reading a string input from a form post

Question

I'm kind of newbie in C#.net . Im doing a form post on Client side which post a csv to my Controller

in My controller I'm unable to read the value. My goal is to finally create a csv file hence I'm avoiding the ajax post. I have the action on my form directing to the correct Url and Im appending the input to the form.

I have something like this on my client side

    WatchList_Class.prototype.Downloads1 = function(csv) {
 var input = '<input type= "text" id="uploadCsv" name="uploadCsv" value=""' +        csv + ' />';
     $('form#uploadCSV').append(input);
     $('form#uploadCSV').submit();
    };

On the controller side I have

   public ActionResult ExportCSVFile(string data) //Im getting data as null
{
  string toReturn = Server.UrlDecode(data);
  return File(System.Text.Encoding.UTF8.GetBytes(toReturn), "text/csv", "exportedData.csv");

}

Im getting string data as null;

Can Any one point out what Im doing wrong. Thanks in advance

Well, the non-nullness of data will be entirely predicated on your having a form element with a name of data somewhere on the client. Nothing in the code you provided indicates one way or another that you have such an element. — Kirk Woll
– Kirk Woll, Commented Mar 7, 2012 at 22:27

Xavier Poinas · Accepted Answer · 2012-03-07 22:26:28Z

3

Try with this action method:

[HttpPost]
public ActionResult ExportCSVFile(HttpPostedFileBase uploadCsv)
{
    uploadCsv.SaveAs("exportedData.csv");
}

(Also note that in your code, the name of your paramater data did NOT match the name of your input control uploadCsv)

answered Mar 7, 2012 at 22:26

Xavier Poinas

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2 Comments

pranay vadel Over a year ago

I have a quick question on the same line what would be the Controller code will be like for reading a string from a form post say the string contain a password. Thanks in Advance

Xavier Poinas Over a year ago

Doesn't matter if it's a password, it's still a string on the server side. So just use ... MyAction(string password) { ... }

Rick Strahl · Accepted Answer · 2012-03-07 22:28:41Z

1

Your parameter has to match the name of the POST variable. So instead of data use uploadCsv:

[HttpPost]
public ActionResult ExportCSVFile(string uploadCsv) 
{
  string toReturn = Server.UrlDecode(data);
  return File(System.Text.Encoding.UTF8.GetBytes(toReturn), "text/csv", "exportedData.csv");
}

answered Mar 7, 2012 at 22:28

Rick Strahl

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Comments

Timothy Lee Russell · Accepted Answer · 2012-03-07 22:27:30Z

0

Have you set the encoding type on the upload form?

enctype="multipart/form-data"

answered Mar 7, 2012 at 22:27

Timothy Lee Russell

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Comments

Alexei Levenkov · Accepted Answer · 2012-03-07 22:28:43Z

0

Most likely reason is your ID for data does not match name of the argument in your ExportCSVFile handler. Use Fiddler to check what is actually posted to your page.

answered Mar 7, 2012 at 22:28

Alexei Levenkov

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