WPF TextBox 验证输入

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转载最新推荐文章于 2025-06-13 15:50:47 发布 · 169 阅读

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原文链接：http://www.cnblogs.com/wangzb/archive/2010/10/25/1860434.html

本文介绍了如何使用WPF中的TextBox控件进行输入验证，包括仅允许数字输入、阻止非法字符的粘贴操作以及屏蔽中文输入等。通过示例代码展示了不同场景下的验证逻辑实现。

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WPF TextBox 验证输入

        //验证输入为数字
        private void txt_time_KeyDown(object sender, KeyEventArgs e)
        {
            if (!((e.Key >= Key.D0 && e.Key <= Key.D9) || (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9)))
            {
                e.Handled = true;
            }
        }

        //屏蔽粘贴非法字符
        private void txt_time_TextChanged(object sender, TextChangedEventArgs e)
        {
            var textBox = sender as TextBox;
            TextChange[] change = new TextChange[e.Changes.Count];
            e.Changes.CopyTo(change, 0);

            int offset = change[0].Offset;
            if (change[0].AddedLength > 0)
            {
                double num = 0;
                if (!Double.TryParse(textBox.Text, out num))
                {
                    textBox.Text = textBox.Text.Remove(offset, change[0].AddedLength);
                    textBox.Select(offset, 0);
                }
            }
        }


        //屏蔽非法按键
        private void txtAge_KeyDown(object sender, KeyEventArgs e)
        {
            TextBox txt = sender as TextBox;

            if ((e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || e.Key == Key.Decimal)
            {
                if (txt.Text.Contains(".") && e.Key == Key.Decimal)
                {
                    e.Handled = true;
                    return;
                }
                e.Handled = false;
            }
            else if (((e.Key >= Key.D0 && e.Key <= Key.D9) || e.Key == Key.OemPeriod) && e.KeyboardDevice.Modifiers != ModifierKeys.Shift)
            {
                if (txt.Text.Contains(".") && e.Key == Key.OemPeriod)
                {
                    e.Handled = true;
                    return;
                }
                e.Handled = false;
            }
            else
            {
                e.Handled = true;
            }
        }

        //屏蔽中文输入和非法字符粘贴输入
        private void txtAge_TextChanged(object sender, TextChangedEventArgs e)
        {
            TextBox textBox = sender as TextBox;
            TextChange[] change = new TextChange[e.Changes.Count];
            e.Changes.CopyTo(change, 0);

            int offset = change[0].Offset;
            if (change[0].AddedLength > 0)
            {
                double num = 0;
                if (!Double.TryParse(textBox.Text, out num))
                {
                    textBox.Text = textBox.Text.Remove(offset, change[0].AddedLength);
                    textBox.Select(offset, 0);
                }
            }
        }

posted on 2010-10-25 15:07 彬子阅读( ...) 评论( ...) 编辑收藏

转载于:https://www.cnblogs.com/wangzb/archive/2010/10/25/1860434.html