问题描述:

I'm newbie in asp.net so I need some help how to solve this.

Basically idea is:

  1. get image from QueryString, for example: /Default.aspx?src=http://www.google.hr/images/logo.png
  2. convert it and resize to 16x16 px ".ico" IE compilant
  3. save it to server, and print/echo URL to ico

Using ASP.NET 3.5 C#

This is my try:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Drawing;

using System.IO;

using System.Net;

namespace WebApplication2

{

public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

var source = Request.QueryString["src"];

if (source != null)

{

WebClient webclient = new WebClient();

using (Stream stream = webclient.OpenRead(source))

{

Bitmap iconbitmap = new Bitmap(System.Drawing.Image.FromFile(webclient));

var icon = Icon.FromHandle((iconbitmap).GetHicon());

FileStream fs = new FileStream("/test1.ico", FileMode.Create);

icon.Save(fs);

fs.Close();

}

}

}

}

}

EDIT:

Got some errors

(Error 1 The best overloaded method match for 'System.Drawing.Image.FromFile(string)' has some invalid arguments )

Thanks

网友答案:

Try this:

        WebClient webclient = new WebClient();
        using (Stream stream = webclient.OpenRead(source))
        {
            Bitmap iconbitmap = new Bitmap(System.Drawing.Image.FromStream(stream));
            var icon = Icon.FromHandle((iconbitmap).GetHicon());
            FileStream fs = new FileStream("/test1.ico", FileMode.Create);
            icon.Save(fs);
            fs.Close();
        }

or if you don't need conversion:

        WebClient webclient = new WebClient();
        webclient.DownloadFile(source, "/test1.ico"); 
网友答案:

System.Drawing.Image.FromFile() is expecting a string, you are passing it a WebClient.

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