WPF TextBox 只能输入数字键

KeyDown事件:2011-04-28优化Tab And RightCtrl

private void tbCount_KeyDown(object sender, KeyEventArgs e)
{
TextBox txt = sender as TextBox;

//屏蔽非法按键
if ((e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || e.Key == Key.Decimal || e.Key.ToString() == "Tab")
{
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;
if (e.Key.ToString() != "RightCtrl")
{
MessageBox.Show(this.Resources["Txt_InnerPage_ConnPointManage_TabMyConnPoint_AddMyCloudSeeNum_Prompt"].ToString(), this.Resources["Txt_InnerPage_ConnPointManage_TabMyConnPoint_AddMyCloudSeeNum_PromptTitle"].ToString(), MessageBoxButton.OK, MessageBoxImage.Warning);
}
}
}

TextChanged事件:

private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
{
//屏蔽中文输入和非法字符粘贴输入
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);
}
}
}

在网上有不少关入这方面的资料，下面是我选用的一个方案

public NumberTextBox()
        {
            InitializeComponent();
            this.KeyDown += NumberTextBox_KeyDown;
            this.TextChanged += NumberTextBox_TextChanged;
        }

void NumberTextBox_KeyDown(object sender, KeyEventArgs e)
        {
            if ((e.Key >= Key.D0 && e.Key <= Key.D9) || (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9))
            {
                e.Handled = false;
            }
            else
            {
                e.Handled = true;
            }
        }

void NumberTextBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            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(this.Text, out num))
                {
                    this.Text = this.Text.Remove(offset, change[0].AddedLength);
                    this.Select(offset, 0);
                }
            }
        }

但是这个方案当输入法为中文的时候效果不理想，于是想到了禁用输入法。

引入xmlns:input="clr-namespace:System.Windows.Input;assembly=PresentationCore"

然后再 TextBox控件的xaml中  input:InputMethod.IsInputMethodEnabled="False" 就可以了。