异步更新文本框
我正在创建一个电子邮件软件，向某些帐户发送电子邮件。我想在每次发送或发送新电子邮件时附加文本。但是文本框在发送所有电子邮件后显示我的报告。如果toList非常大，如30+个电子邮件，则应用程序屏幕变为白色，并且在发送所有电子邮件后，GUI将返回更新的OutPutTextBox。这是SendButton_Click方法中的代码
foreach (String to in toList)
{
bool hasSent = SendMail(from, "password", to, SubjectTextBox.Text, BodyTextBox.Text);
if (hasSent)
{
OutPutTextBox.appendText("Sent to: " + to);
}
else
{
OutPutTextBox.appendText("Failed to: " + to);
}
}
没有找到相关结果
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2 个回复
扭湘阀柿蹄
。在.NET 4.0中有几种方法可以做到这一点。我建议在循环中启动一个对象，并为UI线程安排每个对象的任务延续：string subject = SubjectTextBox.Text; string body = BodyTextBox.Text; var ui = TaskScheduler.FromCurrentSynchronizationContext(); List<Task> mails = new List<Task>(); foreach (string to in toList) { string target = to; var t = Task.Factory.StartNew(() => SendMail(from, "password", target, subject, body)) .ContinueWith(task => { if (task.Result) { OutPutTextBox.appendText("Sent to: " + to); } else { OutPutTextBox.appendText("Failed to: " + to); } }, ui); mails.Add(t); } Task.ContinueWhenAll(mails.ToArray(), _ => { /* do something */ });昧伎
namespace WindowsFormsApplication5 { using System; using System.Threading; using System.Windows.Forms; public partial class Form1 : Form { public Form1() { InitializeComponent(); } TextBox OutPutTextBox = new TextBox(); /// <summary> /// Represents Send Mail information. /// </summary> class MailInfo { public string from; public string password; public string to; public string subject; public string body; } void ProcessToDoList( string[] toList ) { foreach ( var to in toList ) { MailInfo info = new MailInfo(); info.from = "xx"; //TODO. info.password = "yy"; //TODO. info.to = "zz"; //TODO. info.subject = "aa"; //TODO. info.body = "bb"; //TODO. ThreadPool.QueueUserWorkItem( this.SendMail, info ); } } /// <summary> /// Send mail. /// NOTE: this occurs on a separate, non-UI thread. /// </summary> /// <param name="o">Send mail information.</param> void SendMail( object o ) { MailInfo info = ( MailInfo )o; bool hasSent = false; //TODO: put your SendMail implementation here. Set hasSent field. // // Now test result and append text. // if ( hasSent ) { this.AppendText( "Sent to: " + info.to ); } else { this.AppendText( "Failed to: " + info.to ); } } /// <summary> /// Appends the specified text to the TextBox control. /// NOTE: this can be called from any thread. /// </summary> /// <param name="text">The text to append.</param> void AppendText( string text ) { if ( this.InvokeRequired ) { this.BeginInvoke( ( Action )delegate { this.AppendText( text ); } ); return; } OutPutTextBox.AppendText( text ); } } }