In the following example demonstrates how to convert byte array to image and save in folder c# and vise Versa.
C# Convert byte array to image
Recently I was looking for a sample code which could convert byte array[] to an image in C# ASP.Net. It’s very useful when you are writing an ASP.Net Web API method to upload an image or a file on the server.
To implement that first you need to create a memory stream from the byte[] array in your database and then use Image.FromStream. Remember to reference System.Drawing.Imaging and use a using block for the stream.
Find the C# source code below:-
using System.Drawing;
using System.IO;
/// <summary>
/// Summary description for ImageConvertor
/// </summary>
public class ImageConvertor
{
public ImageConvertor()
{
}
public Image ConvertByteArrayToImage(byte[] byteArrayIn)
{
using (MemoryStream ms = new MemoryStream(byteArrayIn))
{
return Image.FromStream(ms);
}
}
public byte[] ConvertImageToByteArray(Image image, string extension)
{
using (var memoryStream = new MemoryStream())
{
switch (extension)
{
case ".jpeg":
case ".jpg":
image.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Jpeg);
break;
case ".png":
image.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Png);
break;
case ".gif":
image.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Gif);
break;
}
return memoryStream.ToArray();
}
}
}
Default.aspx
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Android upload image to server sample code | web api</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2>How to upload image on server in asp.net using c#</h2>
<asp:FileUpload ID="FileUploadControl" runat="server" />
<asp:Button runat="server" ID="UploadButton" Text="Upload" OnClick="UploadButton_Click" />
<br />
<br />
<asp:Label runat="server" ID="StatusLabel" Text="Upload status: " />
<asp:Image ID="showImg" runat="server"></asp:Image>
</div>
</form>
</body>
</html>
Default.aspx.cs
using System;
using System.Drawing;
using System.IO;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void UploadButton_Click(object sender, EventArgs e)
{
if (FileUploadControl.HasFile)
{
try
{
string filename = Path.GetFileName(FileUploadControl.FileName);
FileUploadControl.SaveAs(Server.MapPath("~/") + filename);
var obj = new ImageConvertor();
System.Drawing.Bitmap bmpPostedImage =
new System.Drawing.Bitmap(FileUploadControl.PostedFile.InputStream);
byte[] imageByteArray = obj.ConvertImageToByteArray(bmpPostedImage, ".png");
System.Drawing.Image imageIn = obj.ConvertByteArrayToImage(imageByteArray);
string saveImagePath = Server.MapPath("~/images/") + "Image1.png";
File.WriteAllBytes(saveImagePath, imageByteArray);
StatusLabel.Text = "Upload status: File uploaded!'";
StatusLabel.ForeColor = Color.Red;
}
catch (Exception ex)
{
StatusLabel.Text = ex.Message;
}
}
}
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