c# - Windows C# 表单 : Prompt focus on a textbox

Question

我想知道在 Windows 窗体上使用提示时如何自动选择文本框。下面的代码显示了我尝试过的内容，但它仍然关注按钮而不是文本框。预先感谢您的帮助和协助。

            Form prompt = new Form();
            prompt.Width = 500;
            prompt.Height = 200;
            prompt.Text = caption;
            Label textLabel = new Label() { Left = 50, Top = 20, Text = text };
            TextBox textBox = new TextBox() { Left = 50, Top = 50, Width = 400 };
            Button confirmation = new Button() { Text = "Ok", Left = 50, Width = 100, Top = 90 };
            confirmation.Click += (sender, e) => { prompt.Close(); };
            textBox.Select();
            textBox.Focus();
            prompt.Controls.Add(confirmation);
            prompt.Controls.Add(textLabel);
            prompt.Controls.Add(textBox);
            prompt.ShowDialog();
            return textBox.Text;

Answer 1

您需要等到表单显示后才能将文本框聚焦。在第一次显示表单之前，它无法聚焦任何内容。您可以使用 Shown 事件在表单首次显示后执行一些代码。

string text = "Text";
string caption = "caption";
Form prompt = new Form();
prompt.Width = 500;
prompt.Height = 200;
prompt.Text = caption;
Label textLabel = new Label() { Left = 50, Top = 20, Text = text };
TextBox textBox = new TextBox() { Left = 50, Top = 50, Width = 400 };
Button confirmation = new Button() { Text = "Ok", Left = 50, Width = 100, Top = 90 };
confirmation.Click += (s, e) => { prompt.Close(); };
prompt.Controls.Add(confirmation);
prompt.Controls.Add(textLabel);
prompt.Controls.Add(textBox);
prompt.Shown += (s, e) => textBox.Focus();
prompt.ShowDialog();
return textBox.Text;