以下是一个在搜索函数中使用async和await的示例: 代码语言:txt 复制 using System; using System.Net.Http; using System.Threading.Tasks; using System.Windows.Forms; public partial class MainForm : Form { public MainForm() { InitializeComponent(); } private async void SearchButton_Click(object sende...
private async void Button1_Click(object sender, EventArgs e) { await Task.Run(() => { // 模拟长时间运行的任务 Thread.Sleep(5000); }); MessageBox.Show("任务完成!"); } 4. 确保资源释放 确保所有使用的资源在不再需要时被正确释放。
为了配合Microsoft的Windows Forms平台添加新的异步API决定,v24.2在WinForms消息框(XtraMessageBox)和对话框(XtraDialog) UI组件中都包含了一个新的ShowAsync方法。这种方法对于共享MVVM视图模型的解决方案或围绕WinForms、WPF、WinUI或.NET MAUI项目的异步操作构建的业务逻辑来说是非常宝贵的。C# button.Click += a...
privateasyncvoidbutton1_Click(objectsender, EventArgs e) { await Run(); } privateasync Task Run() { await File.AppendText("temp.dat").WriteAsync("a"); label1.Text ="test"; } 带放弃功能时: 1 2 3 4 classMainForm { CancellationTokenSource cts;//取消令牌 ... 初始化它并将cts传递给 S...
privateasyncvoidButton_Click(objectsender,EventArgse){try{awaitPerformLongRunningOperationAsync();}catch(Exceptionex){MessageBox.Show($"An error occurred: {ex.Message}","Error",MessageBoxButtons.OK,MessageBoxIcon.Error);}} 在这里,由于事件处理程序的签名,async void 是不可避免的,但通过将等待的代码包装...
privateasyncvoidStartButtonClick(objectsender, EventArgs e){ _btnStartStopWatch.Text = _btnStartStopWatch.Text !="Stop"?"Stop":"Start";awaitTask.Run(async() => {while(true) {awaitthis.InvokeAsync(UpdateUiAsync); } });// ***// The actual UI update method// ***asyncTaskUpdateUiAsync...
privateasyncvoidButton_Click(objectsender, EventArgs e){try{awaitPerformLongRunningOperationAsync;}catch (Exception ex){MessageBox.Show($"An error occurred:{ex.Message}","Error", MessageBoxButtons.OK, MessageBoxIcon.Error);}} 在这里,由于事件处理程序的签名,async void 是不可避免的,但通过将等待的代码...
private Label statusLabel;private Button startButton;publicMainForm(){ statusLabel=new Label {Text="Ready",Location=new System.Drawing.Point(10,10),AutoSize=true};startButton=new Button {Text="Start",Location=new System.Drawing.Point(10,40)};startButton.Click+=async(sender,e)=>await StartBut...
privateasyncvoidButton_Click(objectsender, EventArgs e){try{awaitPerformLongRunningOperationAsync(); }catch(Exception ex) { MessageBox.Show($"An error occurred:{ex.Message}","Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } } Here, theasync voidis unavoidable due to the event handler signa...
現在函式goButton_Click會將 WebView2 控制件巡覽至網址列文字框中輸入的 URL。 選取[檔案>全部儲存(Ctrl+Shift+S) 以儲存專案。 按F5以組建及執行專案。 在網址列中,輸入開頭為https的 URL,例如https://www.bing.com,然後按下 [執行!]按鈕: