Question

有没有办法在文本框重命名为txtFName，txtMName等时立即清除它们......它们可能有各种以txt开头的名称。这可能吗？像

这样的东西

private void btnReset_Click(object sender, EventArgs e)
{
    txtFname.Clear();
    txtLName.Clear();
    txtUsername.Clear();
    txtPasswrd.Clear();
    /*So many textboxes to be cleared*/
}

替换为

private void ClearTextboxes(object obj)
{
    /*codes to clear textboxes*/
}

然后我们可以在按钮点击事件中调用它

private void btnReset_Click(object sender, EventArgs e)
{
    ClearTextboxes();
    txtFname.Focus();
}

Answer 1

此方法清除WinForm中的所有文本框

void ClearTextboxes(System.Windows.Forms.Control.ControlCollection ctrls)
    {
       foreach (Control ctrl in ctrls)
       {
          if (ctrl is TextBox)
              ((TextBox)ctrl).Text = string.Empty;
          ClearTextboxes(ctrl.Controls);
       }
    }

你可以称之为

private void btnReset_Click(object sender, EventArgs e)
{
    ClearTextboxes();
    txtFname.Focus();
}

Answer 2

您可以像这样遍历VisualTree中的所有文本框：

foreach (TextBox txtBx in FindVisualChildren<TextBox>(this))
{
    txtBx.Clear();
}

FindVisualChildren：

public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
    {
        if (depObj != null)
        {
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
            {
                DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
                if (child != null && child is T)
                {
                    yield return (T)child;
                }

                foreach (T childOfChild in FindVisualChildren<T>(child))
                {
                    yield return childOfChild;
                }
            }
        }
    }

作为参数，您可以传递任何父级，它可以是StackPanel，或Grid或整个窗口。

Answer 3

使用事件的一种方式是：

using System;
using System.Windows.Forms;

namespace textBoxs
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            Subscribe();
        }

        private event Action ClearAll;

        void Subscribe()
        {
            ClearAll += tbA.Clear;
            ClearAll += tbB.Clear;
            ClearAll += tbC.Clear;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ClearAll();
        }
    }
}

在winform中一次清除所有文本框

3 个答案: