String。包含int吗？

Question

I am wondering how to write this part of the code ..

I would like to say that if the name of my folder contains R + whatever the int ( R1, R52 etc ), then I do an action.

This is what I try to use :

 if(f.Name.Contains("R" + int))
 {

 }

Answer 1

This is a good time to use Regex

if(Regex.IsMatch(f.Name, @"R\d")) {
  ...
}

Answer 2

Use the string representation of the int?

if(f.Name.Contains("R" + i.ToString()))
{

}

Or do you want to match any integer? You'll have to run a regex for that. Probably just "R\\d+" as the expression.

Answer 3

Try using Regex:

if(Regex.IsMatch(f.Name, "R[0-9]"))
{
   // This will only execute if the String starts with R
   // and is followed by 1 or more numbers
}

Answer 4

if (f.Name.Contains ("R" + Convert.ToString(i)))
{
    // Your code here
}

Answer 5

What about this?

if(r.Name.StartsWith("R"))
{

}

Answer 6

Or you can use switch :

string caseSwitch = f.Name;
switch (caseSwitch)
{
    case "R1": 
        Console.WriteLine("Case R1");
        break;
    case "R2":
        Console.WriteLine("Case R2");
        break;
    default:
        Console.WriteLine("Default case");
        break;
}