C# TextBox.Focus方法代码示例

 private void AssignShortcut(TextBox textbox, int row, int column)
 {
     var hotKey = new KeyBinding(new RelayCommand(() => textbox.Focus()), new MultiKeyGesture(new List<Key> { (Key)(row + 34), (Key)(column + 34) }, ModifierKeys.Control | ModifierKeys.Shift));
       this.InputBindings.Add(hotKey);
       if (row < 10 && column < 10)
       {
     hotKey = new KeyBinding(new RelayCommand(() => textbox.Focus()), new MultiKeyGesture(new List<Key> { (Key)(row + 34), (Key)(column + 34) }, ModifierKeys.Control));
     this.InputBindings.Add(hotKey);
     // following is not working
     //hotKey = new KeyBinding(new RelayCommand(() => textbox.Focus()), new MultiKeyGesture(new List<Key> { (Key)(row + 34), (Key)(column + 34) }, ModifierKeys.Alt));
     //this.InputBindings.Add(hotKey);
       }
 }

        public PrintBanner()
        {
            Title = "Print Banner";
            SizeToContent = SizeToContent.WidthAndHeight;

            // Make StackPanel content of window.
            StackPanel stack = new StackPanel();
            Content = stack;

            // Create TextBox.
            txtbox = new TextBox();
            txtbox.Width = 250;
            txtbox.Margin = new Thickness(12);
            stack.Children.Add(txtbox);

            // Create Button.
            Button btn = new Button();
            btn.Content = "_Print...";
            btn.Margin = new Thickness(12);
            btn.Click += PrintOnClick;
            btn.HorizontalAlignment = HorizontalAlignment.Center;
            stack.Children.Add(btn);

            txtbox.Focus();
        }

        private void Use_Zip_Code(object sender, System.Windows.RoutedEventArgs e)
        {
            TextBox textBox = new TextBox();
            // restrict input to digits:
            InputScope inputScope = new InputScope();
            InputScopeName inputScopeName = new InputScopeName();
            inputScopeName.NameValue = InputScopeNameValue.Digits;
            inputScope.Names.Add(inputScopeName);
            textBox.InputScope = inputScope;

            CustomMessageBox messageBox = new CustomMessageBox()
            {
                Message = "Enter your US zip code:",
                LeftButtonContent = "okay",
                RightButtonContent = "cancel",
                Content = textBox
            };
            messageBox.Loaded += (a, b) =>
            {
                textBox.Focus();
            };
            messageBox.Show();
            messageBox.Dismissed += (s, args) =>
            {
                if (args.Result == CustomMessageBoxResult.LeftButton)
                {
                    if (textBox.Text.Length >= 5)
                    {
                        geocodeUsingString(textBox.Text);
                    }
                }
            };
        }

        public static ComboBox WorkWithEmailBox(Grid grid, TextBox emailTextBox, TextCompositionEventArgs e, int columnSpanEmailBox)
        {
            ComboBox comboBox = new ComboBox();
            const string val = "@";
            if (e.Text != val) return comboBox;
            if (emailTextBox.Text.Length < 1) return null;
            if (emailTextBox.Text.IndexOf(val, StringComparison.Ordinal) != -1) return comboBox;
            Grid.SetColumnSpan(emailTextBox, columnSpanEmailBox);

            comboBox.DropDownClosed += (a, r) =>
            {
                if (comboBox.SelectedIndex == -1) return;
                grid.Children.Remove(comboBox);
                Grid.SetColumnSpan(emailTextBox, columnSpanEmailBox+2);
                if (comboBox.SelectedIndex == 0)
                {
                    emailTextBox.Text += val;
                    emailTextBox.Focus();
                }
                else
                {
                    emailTextBox.Text += comboBox.SelectedItem.ToString();
                }
                emailTextBox.SelectionStart = emailTextBox.Text.Length;
                emailTextBox.Focus();
            };
            Grid.SetRow(comboBox, 2);
            comboBox.Items.Add("написать другой");
            comboBox.Items.Add(val + "gmail.com");
            comboBox.Items.Add(val + "mail.ru");
            comboBox.Items.Add(val + "yandex.ua");
            comboBox.Items.Add(val + "rambler.ru");
            comboBox.Items.Add(val + "hotmail.com");
            comboBox.Items.Add(val + "yahoo.com");
            comboBox.Items.Add(val + "inbox.ru");
            comboBox.Items.Add(val + "list.ru");
            comboBox.Items.Add(val + "bk.ru");
            comboBox.Items.Add(val + "mail.ua");
            comboBox.Height = emailTextBox.ActualHeight;
            Grid.SetColumn(comboBox, 4);
            Grid.SetColumnSpan(comboBox, 2);
            grid.Children.Add(comboBox);
            comboBox.IsDropDownOpen = true;
            comboBox.Focus();
            return comboBox;
        }

 public static void Limpiar(TextBox t1, TextBox t2 = null, TextBox t3 = null)
 {
     t1.Clear();
     if (t2 != null)
         t2.Clear();
     if (t3 != null)
         t3.Clear();
     t1.Focus();
 }

 public override void OnApplyTemplate()
 {
     base.OnApplyTemplate();
     _tbName = (TextBox) GetTemplateChild("tbName");
     if (_tbName != null)
     {
         _tbName.Focus();
     }
     _pswb = (PasswordBox) GetTemplateChild("pswb");
 }

 public override void OnApplyTemplate()
 {
     if (textBox != null)
         textBox.KeyDown -= textBox_KeyDown;
     base.OnApplyTemplate();
     textBox = GetTemplateChild("TextBox") as TextBox;
     if (textBox != null)
         textBox.Focus();
     textBox.KeyDown += textBox_KeyDown;
 }

 public bool CheckTextBox(TextBox box)
 {
     if(box.Text.Length == 0)
     {
         MessageBox.Show("Вы ввели не все данные.");
         box.Focus();
         return false;
     }
     return true;
 }

 public override void OnApplyTemplate()
 {
     base.OnApplyTemplate();
     _tb = (TextBox) GetTemplateChild("tbName");
     if (_tb != null)
     {
         _tb.Focus();
     }
     _tbError = (TextBlock) GetTemplateChild("tbError");
 }

        public object Ask(Parameter par)
        {
            var vlc = main.Children.FindByName(ValueControl);
            if (vlc != null)
                main.Children.Remove(vlc);
            Question.Text = "";
            foreach (string s in par.Question.Split(new[] { "\\n" }, StringSplitOptions.None))
            {
                Question.Inlines.Add(new Run { Text = s });
                Question.Inlines.Add(new LineBreak());
            }
            if (par.ParamType == ParamType.PBool)
            {
                var value = new ComboBox { Width = 100, Height = 20, Name = ValueControl, Margin = new Thickness(5, 0, 0, 0) };
                Grid.SetRow(value, 1);
                main.Children.Add(value);
                value.Items.Add(Boolean.TrueString);
                value.Items.Add(Boolean.FalseString);
                value.SelectedIndex = 0;
                value.Focus();
            }
            else
            {
                var value = new TextBox { Width = 400, Name = ValueControl, Margin = new Thickness(5, 0, 0, 0) };
                Grid.SetRow(value, 1);
                main.Children.Add(value);
                if (par.ParamType == ParamType.PDouble || par.ParamType == ParamType.PFuzzy)
                {
                    value.Text = "0";
                    value.TextChanged += ValueTextChanged;
                    value.Tag = par.ParamType;
                }
                else
                    value.Tag = ParamType.PString;
                value.SelectAll();
                value.Focus();
            }

            if (ShowDialog() == true)
            {

                UIElement uie = main.Children.FindByName(ValueControl);
                if (uie is TextBox)
                {
                    ParamType pt = (ParamType) (uie as TextBox).Tag;
                    if (pt == ParamType.PDouble || pt == ParamType.PFuzzy)
                        return double.Parse((uie as TextBox).Text);
                    return (uie as TextBox).Text;
                }
                if (uie is ComboBox)
                    return bool.Parse((uie as ComboBox).Text);
            }
            return null;
        }

        public UriDialog()
        {
            Title = "Enter a URI";
            ShowInTaskbar = false;
            SizeToContent = SizeToContent.WidthAndHeight;
            WindowStyle = WindowStyle.ToolWindow;
            WindowStartupLocation = WindowStartupLocation.CenterOwner;

            txtBox = new TextBox();
            txtBox.Margin = new Thickness(48);
            Content = txtBox;
            txtBox.Focus();
        }

        private void aSircleTextbox_LostFocus(object sender, RoutedEventArgs e)
        {
            int iTextboxPosition = _getTextboxPosition(((TextBox)sender).Name);

            if (iTextboxPosition != 11) //Last Textbox
            {
                int iNextQuestionID = ((int)iTextboxPosition / 2) + 1;
                VisualStateManager.GoToState(this, _sCatapillarPrefix + "Question" + iNextQuestionID.ToString() , true);
                iTextboxPosition += 2; //Next Textbox
                _txtActiveInput = (TextBox)this.FindName(_sCatapillarPrefix + "Sircle" + iTextboxPosition.ToString() + "Textbox");
                _txtActiveInput.Focus();
            }
        }

        public void list_KeyDown(ListBox list, KeyEventArgs e, TextBox txtbox, Popup popup)
        {
            i = txtbox.CaretIndex;

            switch (e.Key)
            {
                case Key.Enter:
                    txtbox.Text = Regex.Replace(txtbox.Text, @"\b" + know + @"\b", UpdatedCollection[list.SelectedIndex]);
                    txtbox.CaretIndex = i + UpdatedCollection[list.SelectedIndex].Length;
                    know = string.Empty;
                    popup.IsOpen = false;
                    e.Handled = true;
                    txtbox.Focus();
                    break;
                case Key.Left:
                    popup.IsOpen = false;
                    txtbox.CaretIndex = i;
                    e.Handled = true;
                    txtbox.Focus();
                    break;
            }
        }

        public MeetTheDockers()
        {
            Title = "Meet the Dockers";

            DockPanel dock = new DockPanel();
            Content = dock;

            // Create menu.
            Menu menu = new Menu();
            MenuItem item = new MenuItem();
            item.Header = "Menu";
            menu.Items.Add(item);

            // Dock menu at top of panel.
            DockPanel.SetDock(menu, Dock.Top);
            dock.Children.Add(menu);

            // Create tool bar.
            ToolBar tool = new ToolBar();
            tool.Header = "Toolbar";

            // Dock tool bar at top of panel.
            DockPanel.SetDock(tool, Dock.Top);
            dock.Children.Add(tool);

            // Create status bar.
            StatusBar status = new StatusBar();
            StatusBarItem statitem = new StatusBarItem();
            statitem.Content = "Status";
            status.Items.Add(statitem);

            // Dock status bar at bottom of panel.
            DockPanel.SetDock(status, Dock.Bottom);
            dock.Children.Add(status);

            // Create list box.
            ListBox lstbox = new ListBox();
            lstbox.Items.Add("List Box Item");

            // Dock list box at left of panel.
            DockPanel.SetDock(lstbox, Dock.Left);
            dock.Children.Add(lstbox);

            // Create text box.
            TextBox txtbox = new TextBox();
            txtbox.AcceptsReturn = true;

            // Add text box to panel & give it input focus.
            dock.Children.Add(txtbox);
            txtbox.Focus();
        }

 private bool IsOkay(String input, TextBox sender)
 {
     if (input.Length > 0)
     {
         return true;
     }
     else
     {
         MessageBox.Show("Check the input.");
         sender.Focus();
         sender.SelectAll();
         return false;
     }
 }