WPF文本框只允许输入数字[转]

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;
        }