C# 非同期Async/Completed(EAP)

public Form1()
{
    System.Net.WebClient wc = new System.Net.WebClient();
    wc.DownloadStringCompleted += (s, e) =>
    {
        MessageBox.Show("done");
    };

    wc.DownloadStringAsync(new Uri("https://www.google.co.jp"));
}

public Form1()

{

System.Net.WebClient wc = new System.Net.WebClient();

wc.DownloadStringCompleted += (s, e) =>

{

MessageBox.Show("done");

};

wc.DownloadStringAsync(new Uri("https://www.google.co.jp"));

}

BackgroundWorker w = new BackgroundWorker();
public Form1()
{
    InitializeComponent();
    // xxxAsyncで実行、終了時にxxxCompletedのコールバック
    // BackgroundWorkerが標準でサポート

    w.DoWork += OnWork;
    w.RunWorkerCompleted += OnWorkCompleted;

    w.RunWorkerAsync();

    MessageBox.Show("end");
    // 待機がないとcompletedが表示される前にメインスレッドが終了する
}

private void OnWork(object sender, DoWorkEventArgs e)
{
    MessageBox.Show("work");
}
private void OnWorkCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    MessageBox.Show("completed");
}

BackgroundWorker w = new BackgroundWorker();

public Form1()

{

InitializeComponent();

// xxxAsyncで実行、終了時にxxxCompletedのコールバック

// BackgroundWorkerが標準でサポート

w.DoWork += OnWork;

w.RunWorkerCompleted += OnWorkCompleted;

w.RunWorkerAsync();

MessageBox.Show("end");

// 待機がないとcompletedが表示される前にメインスレッドが終了する

}

private void OnWork(object sender, DoWorkEventArgs e)

{

MessageBox.Show("work");

}

private void OnWorkCompleted(object sender, RunWorkerCompletedEventArgs e)

{

MessageBox.Show("completed");

}

対応している型

System.ComponentModel.Component
System.ComponentModel.BackgroundWorker
System.Media.SoundPlayer
System.Net.WebClient
System.Net.NetworkInformation.Ping
System.Windows.Forms.PictureBox
System.Net.Mail.SmtpClient
System.Deployment.Application.ApplicationDeployment
System.Deployment.Application.InPlaceHostingManager
System.Activities.WorkflowInvoker
System.ServiceModel.Activities.WorkflowControlClient
System.Net.PeerToPeer.PeerNameResolver
System.Net.PeerToPeer.Collaboration.ContactManager
System.Net.PeerToPeer.Collaboration.Peer
System.Net.PeerToPeer.Collaboration.PeerContact
System.Net.PeerToPeer.Collaboration.PeerNearMe
System.ServiceModel.Discovery.AnnouncementClient
System.ServiceModel.Discovery.DiscoveryClient