CODEWITHSUNDEEP
c#asp.net.net
Nate
Nate

Reputation: 2326

Response.BinaryWrite() - Getting Junk at the beginning of file

I'm trying to write a string to a file that a user can download from my site.

var tcxString = "Some code to get my string";

byte[] bytes;
MemoryStream cvsStream = new MemoryStream();
BinaryFormatter bf = new BinaryFormatter();
bf.Serialize(cvsStream, tcxString);

cvsStream.Seek(0, SeekOrigin.Begin);
bytes = cvsStream.ToArray();

Response.Clear();
Response.AppendHeader("content-length", cvsStream.Length.ToString());
Response.ContentType = "application/octet-stream";
Response.AppendHeader("content-disposition", "attachment; filename=MyFileName.txt");
Response.BinaryWrite(bytes);

The output becomes:

    ÿÿÿÿ          Some code to get my string

I'm guessing it has to do with my Seek location but I don't know what the correct Seek should be. I see junk at the end of my file sometimes too. How can I get rid of the junk at the beginning and end of my file?

Upvotes: 0

Views: 2461

Answers (2)

Carl R
Carl R

Reputation: 8214

Is it a text file you are writing? Just write it's content to the output stream using Response.Write.

string tcxString = "Some code to get my string";

Response.Clear();
Response.ContentType = "text/plain";
Response.AppendHeader("content-disposition", "attachment; filename=MyFileName.txt");
Response.Write(tcxString);

Upvotes: 2

Shoaib Shaikh
Shoaib Shaikh

Reputation: 4585

This is because of binary formatter you are using.. try Encoding.GetBytes instead.

        var tcxString = "Some code to get my string";

        byte[] bytes = Encoding.UTF8.GetBytes(tcxString);

        Response.Clear();
        Response.AppendHeader("content-length", bytes.Length.ToString());
        Response.ContentType = "application/octet-stream";
        Response.AppendHeader("content-disposition", "attachment; filename=MyFileName.txt");
        Response.BinaryWrite(bytes);

Regards

Upvotes: 2

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