/// <summary>
/// Processes HTTP Web requests to export SVG.
/// </summary>
/// <param name="context">An HttpContext object that provides references
/// to the intrinsic server objects (for example, Request, Response,
/// Session, and Server) used to service HTTP requests.</param>
internal static void ProcessExportRequest(HttpContext context)
{
if (context != null &&
context.Request != null &&
context.Response != null &&
context.Request.HttpMethod == "POST")
{
HttpRequest request = context.Request;
// Get HTTP POST form variables, ensuring they are not null.
string filename = request.Form["filename"];
string type = request.Form["type"];
int width = 0;
string svg = request.Form["svg"];
if (filename != null &&
type != null &&
Int32.TryParse(request.Form["width"], out width) &&
svg != null)
{
// Create a new chart export object using form variables.
Exporter export = new Exporter(filename, type, width, svg);
// Write the exported chart to the HTTP Response object.
export.WriteToHttpResponse(context.Response);
// Short-circuit this ASP.NET request and end. Short-circuiting
// prevents other modules from adding/interfering with the output.
HttpContext.Current.ApplicationInstance.CompleteRequest();
context.Response.End();
}
}
}
public ActionResult Export(string filename, string type, string svg, int width = 0)
{
if (filename != null && type != null && svg != null)
{
// Create a new chart export object using form variables.
Exporter export = new Exporter(filename, type, width, svg, "Segoe UI");
// Write the exported chart to the HTTP Response object.
export.WriteToHttpResponse(HttpContext.Response);
// Finish request
Response.OutputStream.Flush();
HttpContext.ApplicationInstance.CompleteRequest();
}
return new EmptyResult();
}