WPF中的数字数据输入

   <TextBox.Text>
       <Binding Path="Number" UpdateSourceTrigger="PropertyChanged">
           <Binding.ValidationRules>
               <local:NumberValidationRule />
            </Binding.ValidationRules>
        </Binding>
    </TextBox.Text>
</TextBox>

public class NumberValidationRule : ValidationRule
{
    public override ValidationResult Validate(object value, CultureInfo cultureInfo)
    {
        string input = value as string;
        if (string.IsNullOrEmpty(input))
        {
            return new ValidationResult(false, "输入不能为空");
        }

        if (!IsNumeric(input))
        {
            return new ValidationResult(false, "输入必须是数字");
        }

        return ValidationResult.ValidResult;
    }

    private bool IsNumeric(string input)
    {
        return input.All(char.IsDigit);
    }
}