C#判断字符串是否是数字

/// <summary>

/// 判断字符串是否是数字

/// </summary>

public static bool isnumber(string s)

{

    if (string.isnullorwhitespace(s)) return false;

    const string pattern = "^[0-9]*$";

    regex rx = new regex(pattern);

    return rx.ismatch(s);

}