Question

I am having an error in my program when trying to download files from a remote server, I am using the System.Net Lib and it is having an issue converting to it.

I am getting the error Message

Cannot implicitly convert type
‘System.ComponentModel.AsyncCompletedEventHandler’ to
System.Net.DownloadProgressChangedEventHandler’

on the last line in the code block

AsyncCompletedEventHandler(client_DownloadFileCompleted);

Error Line ^

Form.cs V

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;

namespace Buildcraft_Installer
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void btnStartDownload_Click(object sender, EventArgs e)
        {
            prgDownload.Visible = true;
                WebClient client = new WebClient();
                client.DownloadProgressChanged += new
                DownloadProgressChangedEventHandler(client_DownloadProgressChanged);
                client.DownloadProgressChanged += new
                AsyncCompletedEventHandler(client_DownloadFileCompleted);

I would be very grateful if anyone had a way to resolve this or a workaround to get the same result, thanks 🙂

Answer 1

You probably meant to write client.DownloadFileCompleted on your last line.

You currently have two calls to DownloadProgressChanged, one with a matching delegate type (DownloadProgressChangedEventHandler), one with the wrong one (AsyncCompletedEventHandler).