bind an image in c# using byte array - asp.net

Question

protected void Button2_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
try
{
string filename = Path.GetFileName(FileUpload1.PostedFile.FileName);
string ext = Path.GetExtension(filename);
if (ext == ".png" || ext == ".jpg" || ext == ".jpeg" || ext == ".PNG" || ext == ".JPG" || ext == ".JPEG" || ext == ".gif" || ext == ".GIF")
{
Stream fs = FileUpload1.PostedFile.InputStream;
BinaryReader br = new BinaryReader(fs);
Byte[] bytes = br.ReadBytes((Int32)fs.Length);
string base64String = Convert.ToBase64String(bytes, 0, bytes.Length);
Image1.ImageUrl = "data:image/jpeg;base64," +base64String ;
}
else
{
Response.Write("<script>alert('unsupported format of photo file');</script>");
}
}
catch (Exception ex)
{
Response.Write("<script>alert('" + ex.Message + "');</script>");
}
}
}

Answer 1

Stream fs = FileUpload1.PostedFile.InputStream;
BinaryReader br = new BinaryReader(fs);
Byte[] bytes = br.ReadBytes((Int32)fs.Length);
string base64String = Convert.ToBase64String(bytes, 0, bytes.Length);
Image1.ImageUrl = "data:image/jpeg;base64," +base64String ;
This code is working well ..

Answer 2

I assume you are trying to display image with base64 string in an System.Web.UI.WebControls.Image.
first, create a client JavaScript function to set src attribute of your <img /> tag:
function setImageData(imageBase64) {
document.getElementById("imageId").src = "data:image/png;base64," + imageBase64;
}
then, Invoke that method by
Response.Write("<script>setImageData("+ base64String +")</script>");

Answer 3

I would recommend you to create ImageHandler (inherited from IHttpHandler), register it in the web.config file, and modify your Button2_Click function:
public void Button2_Click(object sender, EventArgs e)
{
...
Image1.ImageUrl = "URL_TO_IMAGE_HANDLER.jpg";
...
}
You can read about http-handlers here: http://www.codeproject.com/Articles/34084/Generic-Image-Handler-Using-IHttpHandler
This solution is much better than Base64 approach, it's also possible to implement caching support here

Answer 4

See this Tutorial you can use byte array to get images
UPDATE: By the way you should use this function :
string imageDataParsed = imageData.Substring( imageData.IndexOf( ',' ) + 1 );
byte[] imageBytes = Convert.FromBase64String( imageDataParsed );
using ( var imageStream = new MemoryStream( imageBytes, false ) )
{
Bitmap image = new Bitmap( imageStream );
}
Edit
You can convert base64string to image by Image.FromStream. You will need to convert the base64string to stream first.
byte[] imageBytes = Convert.FromBase64String(imgBase64String);
MemoryStream ms1 = new MemoryStream(imageBytes);
Image img = Image.FromStream(ms1);

Answer 5

I have just solved this question..this is the updated code..
protected void Button2_Click(object sender, EventArgs e)
{
if (FileUpload1.HasFile)
{
try
{
string filename = Path.GetFileName(FileUpload1.PostedFile.FileName);
string ext = Path.GetExtension(filename);
if (ext == ".png" || ext == ".jpg" || ext == ".jpeg" || ext == ".PNG" || ext == ".JPG" || ext == ".JPEG" || ext == ".gif" || ext == ".GIF")
{
Stream fs = FileUpload1.PostedFile.InputStream;
BinaryReader br = new BinaryReader(fs);
Byte[] bytes = br.ReadBytes((Int32)fs.Length);
string base64String = Convert.ToBase64String(bytes, 0, bytes.Length);
Image1.ImageUrl = "data:image/jpeg;base64," + base64String;
}
else
{
Response.Write("<script>alert('unsupported format of photo file');</script>");
}
}
catch (Exception ex)
{
Response.Write("<script>alert('" + ex.Message + "');</script>");
}
}
}