Can't download image to client machine

Question

I have base64 string of an image. converting it to byte array & then converting it to memoryStream. How can i download this image to client machine. The base64 string or image is not saved on server/folder/anywhere. It is create dynamically. I have tried

1) Response.ContentType = "image/png" => gives exception obj not set to instant of an object. like this

Context.Response.Clear();
Context.Response.ClearHeaders();
Context.Response.AddHeader("Content-Disposition", "attachment; filename=" + registrationId + ".png");
Context.Response.ContentType = "image/jpeg";
Response.AddHeader("Content-Length", bytes.Length.ToString());
//Response.ContentType = "application/octet-stream";
Context.Response.BinaryWrite(bytes);

2) using web client => gives exception

using (WebClient client = new WebClient())
{
    client.DownloadFile(ms1.ToString(), registrationId + ".png");
}

Any other solution?

How about [germankiwi's answer](http://stackoverflow.com/a/12631127/5588347)? — StackUseR, Jan 10 '17 at 06:59
Why are you using `Response.AddHeader("Content-Length", bytes.Length.ToString());` without `Context.`? — GraDea, Jan 10 '17 at 08:26
In second scenario you just try download file to server. It doesn't work. — GraDea, Jan 10 '17 at 08:26
@GraDea ...It works now..my page was not able to run above code..so finally i call another page & in that OnPageLoad() i ran above code..Thanks — Pratik Patani, Jan 12 '17 at 11:34

score 0 · Answer 1 · answered Jan 10 '17 at 10:02

0

Just try to change

Response.AddHeader("Content-Length", bytes.Length.ToString());

to

Context.Response.AddHeader("Content-Length", bytes.Length.ToString());

I think you doesn't have valid Page object in this context.

answered Jan 10 '17 at 10:02

GraDea

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7
23

@GraDea...got error on what you have suggested.. "Value does not fall within the expected range." – Pratik Patani Jan 10 '17 at 10:09

Can't download image to client machine

1 Answers1