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I have an ASP.NET web form. This web form has an event handler that generates some HTML. This HTML is based on the time-of-day, that is why it is created in the event handler. Based on the time of day, an image is created programmatically via the following method:
private Bitmap GetImageForTime(DateTime time)
{
Bitmap bitmap = new Bitmap();
// Dynamically build the bitmap...
return bitmap;
}
I want to call this method when the HTML is being generated. However, I do NOT want to write the image on the server. Instead, I would like to figure out a way to write it out along with the HTML. In a sense, I'm trying to accomplish the following:
protected void myLiteral_Load(object sender, EventArgs e)
{
string html = "<table><tr><td>";
html += GetImageForTime(DateTime.Now); // This is the problem because it's binary.
html += "</td><td>";
html += GetWeatherHtmlText();
html += "</td></tr></table>";
myLiteral.Text = html;
}
Is this possible? If so, how?
288
I would suggest implementing an IHttpHandler that generates your image and returns it as a byte stream. Then in the tag on the page, set the src attribute to the address of the HTTP Handler.
<html><body><img src="TimeImageHandler.ashx"/></body></html>
Example: http://www.c-sharpcorner.com/uploadfile/desaijm/httphandlersforimages11152005062705am/httphandlersforimages.aspx
Generic HTTP Handlers are pretty simple to create once you're aware of them:
public class TimeImageHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
Bitmap bitmap = GetImageForTime(DateTime.Now);
context.Response.ContentType = "image/jpeg";
bitmap.Save(context.Response.OutputStream, ImageFormat.Jpeg);
}
public bool IsReusable { get { return false; } }
}
The way I have done this is to create an image tag in the HTML and point the image source (<img src="xxx" />) to a page that dynamically creates the image and returns that (and only that) on the response stream, with the correct mime type.
24
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