ExportCommand

ExportCommand.cs

using System;
using System.IO;
using System.Text;
using System.Web;
using Sitecore.Data.Items;
using Sitecore.Diagnostics;
using Sitecore.Form.Core.Configuration;
using Sitecore.Form.Core.Utility;
using Sitecore.Forms.Core.Commands.Export;
using Sitecore.IO;
using Sitecore.Shell.Framework.Commands;
using Sitecore.Web.UI.Sheer;
using Sitecore.Web.UI.WebControls;
using Sitecore.Web.UI.XamlSharp.Continuations;
using System.Collections.Specialized;

namespace MyProject.Web.Commands
{
	public class MyCommand : ExportToXml
	{
		public override void Execute(CommandContext context)
		{
			Assert.ArgumentNotNull((object)context, "context");
			string str1 = context.Parameters["items"];
			string str2 = context.Parameters["mode"];
			if (string.IsNullOrEmpty(str1) && (string.IsNullOrEmpty(str2) || str2 != "all") || str2 == "all" && int.Parse(context.Parameters["count"]) == 0)
			{
				SheerResponse.Alert(ResourceManager.Localize("SELECT_ITEM_FIRST"));
			}
			else
			{
				Item obj = context.Items[0];
				NameValueCollection parameters = new NameValueCollection();
				parameters["id"] = obj.ID.ToString();
				parameters["la"] = obj.Language.Name;
				parameters["vs"] = obj.Version.Number.ToString();
				parameters["db"] = obj.Database.Name;
				parameters["items"] = context.Parameters["items"] ?? string.Empty;
				parameters["mode"] = context.Parameters["mode"] ?? string.Empty;
				parameters["fields"] = context.Parameters["fields"];
				parameters["view"] = context.Parameters["view"];
				parameters["tempfile"] = WebUtil.GetTempFileName();

				//Do necessary work to generate file of your choosing, saving the contents into parameters["tempfile"]

				ContinuationManager.Current.Start((ISupportsContinuation)this, "ExportContents", new ClientPipelineArgs(parameters));
			}
		}

		public void ExportContents(ClientPipelineArgs args)
		{
			Assert.ArgumentNotNull(args, "args");
			var filePath = args.Parameters["tempfile"];
			HttpContext.Current.Session["exportcontent"] = File.ReadAllBytes(filePath); //may need to change depending on the type of file
			HttpContext.Current.Session["filename"] = "myFileName.myExtension"; //fill in with your filename and extension
			HttpContext.Current.Session["contentType"] = "myContentType"; //fill in with your content type
			var stringBuilder = new StringBuilder();
			stringBuilder.Append("var iframe=document.createElement('iframe');");
			stringBuilder.Append("iframe.src='/path/to/MyExportControl.aspx';"); //This control will do the work of streaming content back to the browser
			stringBuilder.Append("iframe.width='1';");
			stringBuilder.Append("iframe.height='1';");
			stringBuilder.Append("document.body.appendChild(iframe);");
			SheerResponse.Eval(((object)stringBuilder).ToString());
			try
			{
				FileUtil.Delete(filePath); //delete tempfile
			}
			catch (Exception ex)
			{
				Log.Error(string.Format("An unexpected error occured when exporting file: {0}", ex.Message)
							, ex
							, this);
			}
		}
	}
}