使用LINQ检查字符串中是否至少有一个数字

"abc3def".Any(c => char.IsDigit(c));

更新 作为 @Cipher 指出,它实际上可以缩短:

"abc3def".Any(char.IsDigit);

试试这个

public static bool HasNumber(this string input) {
  return input.Where(x => Char.IsDigit(x)).Any();
}

用法

string x = GetTheString();
if ( x.HasNumber() ) {
  ...
}

或可能使用regex:

string input = "123 find if this has a number";
bool containsNum = Regex.IsMatch(input, @"\d");
if (containsNum)
{
 //Do Something
}

这个怎么样?

bool test = System.Text.RegularExpressions.Regex.IsMatch(test, @"\d");

string number = fn_txt.Text;   //textbox
        Regex regex2 = new Regex(@"\d");   //check  number 
        Match match2 = regex2.Match(number);
        if (match2.Success)    // if found number 
        {  **// do what you want here** 
            fn_warm.Visible = true;    // visible warm lable
            fn_warm.Text = "write your text here ";   /
        }