C#：有没有办法在不使用正则表达式的情况下搜索数字的字符串？

Question

Is there a way to check to see if a string contains any numeric digits in it without using regex? I was thinking of just splitting it into an array and running a search on that, but something tells me there is an easier way:

//pseudocode
string aString = "The number 4"

If (aString contains a number) Then enter validation loop
Else return to main

//output
"The string contains a number. Are you sure you want to continue?"

Answer 1

var containsdigit = somestring.Any(char.IsDigit);

Answer 2

您可以将String.IndexOfAny用作：

bool isNumeric = mystring.IndexOfAny("0123456789".ToCharArray()) > -1;

Answer 3

You could create an extension method for string and use a combination of LINQ and the Char.IsNumber function eg

public static class StringExt
{
    public static bool ContainsNumber(this string str)
    {
        return str.Any(c => Char.IsNumber(c)); 
    }
}

Then your logic would look like:

//pseudocodestring 
string str = "The number 4";
If (aString.ContainsNumber())
    enter validation