一个c#的输入框函数

private static string InputBox(string Caption, string Hint, string Default)
{
Form InputForm = new Form();
InputForm.MinimizeBox = false;
InputForm.MaximizeBox = false;
InputForm.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
InputForm.StartPosition = FormStartPosition.CenterScreen;
InputForm.Width = 220;
InputForm.Height = 150;

InputForm.Text = Caption;
Label lbl = new Label();
lbl.Text = Hint;
lbl.Left = 10;
lbl.Top = 20;
lbl.Parent = InputForm;
lbl.AutoSize = true;
TextBox tb = new TextBox();
tb.Left = 30;
tb.Top = 45;
tb.Width = 160;
tb.Parent = InputForm;
tb.Text = Default;
tb.SelectAll();
Button btnok = new Button();
btnok.Left = 30;
btnok.Top = 80;
btnok.Parent = InputForm;
btnok.Text = "确定";
InputForm.AcceptButton = btnok;//回车响应

btnok.DialogResult = DialogResult.OK;
Button btncancal = new Button();
btncancal.Left = 120;
btncancal.Top = 80;
btncancal.Parent = InputForm;
btncancal.Text = "取消";
btncancal.DialogResult = DialogResult.Cancel;
try
{
if (InputForm.ShowDialog() == DialogResult.OK)
{
return tb.Text;
}
else
{
return null;
}
}
finally
{
InputForm.Dispose();
}
}