希望这能有所帮助

string myString = "abc";
double num;
bool isNumber = double.TryParse(myString , out num);

if isNumber 
{
//string is number
}
else
{
//string is not a number
}

希望这能有所帮助

string myString = "abc";
double num;
bool isNumber = double.TryParse(myString , out num);

if isNumber 
{
//string is number
}
else
{
//string is not a number
}

如果你想知道一个字符串是否是一个数字，你可以尝试解析它:

var numberString = "123";
int number;

int.TryParse(numberString , out number);

注意，TryParse返回一个bool值，您可以使用它来检查解析是否成功。

您可以使用TryParse来确定该字符串是否可以解析为整数。

int i;
bool bNum = int.TryParse(str, out i);

布尔值会告诉你它是否有效。

使用这些扩展方法可以清楚地区分检查字符串是数字还是字符串只包含0-9位数字

public static class ExtensionMethods
{
    /// <summary>
    /// Returns true if string could represent a valid number, including decimals and local culture symbols
    /// </summary>
    public static bool IsNumeric(this string s)
    {
        decimal d;
        return decimal.TryParse(s, System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.CurrentCulture, out d);
    }

    /// <summary>
    /// Returns true only if string is wholy comprised of numerical digits
    /// </summary>
    public static bool IsNumbersOnly(this string s)
    {
        if (s == null || s == string.Empty)
            return false;

        foreach (char c in s)
        {
            if (c < '0' || c > '9') // Avoid using .IsDigit or .IsNumeric as they will return true for other characters
                return false;
        }

        return true;
    }
}

我已经使用了这个函数几次:

public static bool IsNumeric(object Expression)
{
    double retNum;

    bool isNum = Double.TryParse(Convert.ToString(Expression), System.Globalization.NumberStyles.Any, System.Globalization.NumberFormatInfo.InvariantInfo, out retNum);
    return isNum;
}

但你也可以用;

bool b1 = Microsoft.VisualBasic.Information.IsNumeric("1"); //true
bool b2 = Microsoft.VisualBasic.Information.IsNumeric("1aa"); // false

从基准测试IsNumeric选项

(来源:aspalliance.com)

(来源:aspalliance.com)