C#如果包含/等于

Question

So I'm wondering what would be the correct approach to checking a response,

Example -

response = "43";

then if I use

if(response.Contains("4")) {
    //do code
}

if(response.Contains("3")) {
    //do code
}

both would be equally true, therefore both executing a function, however I want it to be equal to start and end of string, so I'm using -

if(response.Equals("3")) {
   //do code
} 

therefore the above function would only execute if it WAS EQUAL TO 3 not containing 3? ( Please correct me if I'm wrong )

However for one statement I want to check for multiple strings/integers. So it would be more efficient for my if statement to check each item in a list, rather than repeat

response.Equals(".") && response.Equals(".") etc etc

how could do I do this?

So check if response is equal to any item in

 List<string> mylist = new List<string>(new string[] { "1", "2", "3" });

preferably without a for loop..

Answer 1

You'l want to use mylist.Contains(response) to check for this. List.Contains checks for exact matches only, so it will avoid your original issue of having two blocks execute.