Displaying a Binary Image in RadAvatar for ASP.NET AJAX
Environment
| Property | Value |
|---|---|
| Product | RadBinaryImage for ASP.NET AJAX |
Description
I want to display a binary image from a SQL datasource in the RadAvatar control for ASP.NET AJAX instead of providing a URL for the image.
Solution
To display a binary image from a SQL datasource in the RadAvatar control, you need to serve the binary image data through a handler or a similar endpoint that can convert the binary data into a stream that the browser can interpret as an image. Here are the steps to achieve this:
- Implement a generic handler (ImageHandler.ashx) in your project:
<%@ WebHandler Language="C#" Class="ImageHandler" %>
using System;
using System.Web;
public class ImageHandler : IHttpHandler {
public void ProcessRequest(HttpContext context) {
// Dummy binary data for an image, in a real scenario, fetch from your database
byte[] imageData = Convert.FromBase64String("iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAYAAABw4pVUAAAB40lEQVR4nO2T21EEMQwEr8g/DeI8PigVLMXB+qkZuTsBS2714wEAAAAAAAAAMJ3n++OZPcMM3rIHgCslhEQdFSopIaQS9kJ+VuFeib2QalgLeVWDcyXWQipiK+S/ClwrsRVSFUshd6/fsRJLIZWxE9J69W6V2AmpjpWQ3mt3qsRKyAnYCBm9cpdKbIScgoWQWdftUImFkJOQFzL7qtUrkRdyGtJCVl2zciXSQk5EVsjqK1atRFbIqUgK2XW9ipVICjkZOSG7r1atEjkhpyMlJOtalSqREgJCQrKvNPv9QEYIfCIhROU6FeaQEAJfpAtRuMrvZM+TLgSupArJvsZXZM5FIWKk\r\n"); // A small orange triangle
context.Response.ContentType = "image/png";
context.Response.BinaryWrite(imageData);
}
public bool IsReusable {
get {
return true;
}
}
}
- Configure the RadAvatar control (Default.aspx) to use the image handler:
<%@ Page Language="C#" AutoEventWireup="true" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager runat="server" />
<img src="ImageHandler.ashx" alt="Image" />
<asp:Image ID="Image1" runat="server" ImageUrl="ImageHandler.ashx" />
<telerik:RadAvatar runat="server" ID="RadAvatar1" Image="ImageHandler.ashx" Type="Image"></telerik:RadAvatar>
</form>
</body>
</html>
That's it! Now the RadAvatar control will display the binary image from the SQL datasource using the ImageHandler endpoint. Please note that in the code example, a dummy binary image data is used, and in a real scenario, you would fetch the binary image data from your database.
For more information, you can refer to the following StackOverflow post: How to load image from binary data in Asp.Net?