转自：http://www.oschina.net/code/snippet_565270_10848

XAML代码< TextBox Height="23" HorizontalAlignment="Left" Margin="100,5,0,0" Name="textBox1" VerticalAlignment="Top" Width="120"                  DataObject.Pasting="textBox1_Pasting" PreviewKeyDown="textBox1_PreviewKeyDown" InputMethod.IsInputMethodEnabled="False"                   PreviewTextInput="textBox1_PreviewTextInput"                 / >  cs代码 //检测粘贴        private void textBox1_Pasting(object sender, DataObjectPastingEventArgs e)        {            if (e.DataObject.GetDataPresent(typeof(String)))            {                String text = (String)e.DataObject.GetData(typeof(String));                if (!isNumberic(text))                { e.CancelCommand(); }            }            else { e.CancelCommand(); }         }         private void textBox1_PreviewKeyDown(object sender, KeyEventArgs e)        {            if (e.Key == Key.Space)                e.Handled = true;        }         private void textBox1_PreviewTextInput(object sender, TextCompositionEventArgs e)        {            if (!isNumberic(e.Text))            {                e.Handled = true;            }            else                e.Handled = false;        }        //isDigit是否是数字        public static bool isNumberic(string _string)        {            if (string.IsNullOrEmpty(_string))                return false;            foreach (char c in _string)            {                if (!char.IsDigit(c))                    //if(c<'0' c="">'9')//最好的方法,在下面测试数据中再加一个0，然后这种方法效率会搞10毫秒左右                    return false;            }            return true;        }