wpf验证规则：使用点而不是逗号验证整数

wpf validation rule: validate integer with dot instead of comma

我正在开发一个c＃wpf应用程序，我想在文本框中验证用户输入。我有这样的验证规则：

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public class NumericRule : ValidationRule
{
/// <summary>
/// Checks whether a value can be converted to a numeric value.
/// </summary>
public override ValidationResult Validate(object value, CultureInfo cultureInfo)
{
string input = value as string;

//try conversion
int result;
var status = int.TryParse(input, NumberStyles.Any,
CultureInfo.InvariantCulture, out result);

//return valid result if conversion succeeded
return status ? ValidationResult.ValidResult
: new ValidationResult(false, input +" is not a number");
}
}

但是，输入带有小数的数字(如3.5)时，表示该数字无效。输入3,5即可。我希望这两个数字都有效，如果输入带逗号的值，则将其转换为点。另外我想在点后最多有3位小数。

有帮助吗？

谢谢

相关讨论

我想你要解析为double。如果你想要"，"和"。" 作为分隔符，您可以查看多种文化。将您需要支持的文化添加到列表中。

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public class NumericRule : ValidationRule
{
private readonly List<CultureInfo> cultures = new List<CultureInfo> {
CultureInfo.CurrentCulture,
CultureInfo.CurrentUICulture,
CultureInfo.InvariantCulture
};

public override ValidationResult Validate (object value, CultureInfo cultureInfo)
{
string input = (string)value;

bool success = false;
foreach (CultureInfo culture in cultures) {
double result;
if (double.TryParse(input, NumberStyles.AllowLeadingSign | NumberStyles.AllowDecimalPoint, culture, out result)) {
int decimalPos = input.IndexOf(culture.NumberFormat.NumberDecimalSeparator);
if (decimalPos == -1) {
success = true;
break;
}
if (input.Substring(decimalPos + 1).Length > 3)
return new ValidationResult(false,"Too many digits in" + input);
success = true;
break;
}
}
return success ? ValidationResult.ValidResult : new ValidationResult(false, input +" is not a number");
}
}