Multiple String Comparison with C#

Multiple string comparison with C#

Use Enumerable.Contains<T> which is an extension method on IEnumerable<T>:

var strings = new List<string> { "A", "B", "C" };
string x = // some string
bool contains = strings.Contains(x, StringComparer.OrdinalIgnoreCase);
if(contains) {
    // do something
}

C# - Compare one string variables to multiple other string (String.Equals)

Create collection of values:

string[] values = { "de", "de-DE" };

Use Contains method:

if (values.Contains(interSubDir))

It gives O(n) performance.

If your collection is very big, then you can use Array.BinarySearch method, that gives you O(log n) performance.

if (Array.BinarySearch(values, interSubDir) >= 0)

However, the collection must be sorted first.

Array.Sort(values);

Compare multiple strings in C#

Assuming that you've stored the strings in a colllection like array or list, you can use Enumerable.All:

string first = strings.FirstOrDefault(s => s != "N/A");
bool allEqual = first == null ||  strings.All(s => s == "N/A" || s == first);

Explanation: you can compare all strings with one of your choice(i take the first), if one is different allEqual must be false. I need to use FirstOrDefault since it's possible that all strings are "N/A" or the list is empty, then First would throw an exception.

DEMO

C# How to compare multiple array values (strings) in if-statement?

In c#, you can't use

if (a == b == c)

Instead you have to be explicit:

if (a == b && b == c)

So instead of

board[0].Equals(board[1]).Equals(board[2]).Equals("X")

You have to write

board[0] == "X" && board[1] == "X" && board[2] == "X"

Compare multiple strings to multiple regular expressions C#

You can use this code:

public List<string> ValidateNames(List<string> inputList, List<string> patternList)
{
    var missMatchInputList = new List<string>();

    foreach (var input in inputList)
        foreach (var pattern in patternList)
            if (!Regex.IsMatch(input, pattern))
            {
                missMatchInputList.Add(input);
                break;
            }

    return missMatchInputList;
}

C# Multiple String Compare

If those strings are the same for all the cases - make them global:

string a = "test";
string b = "try";
string c = "compare";
//case 1
for (int i = 1; i <= 2; i++)
{
     if (a == b) { do something };
     if (a == c) { do something};
 }
 //case 2
 for (int i = 3; i <= 4; i++)
{
     if (a == b) { do something };
     if (a == c) { do something};
}

Doing this you will avoid repeating initializing this strings in every case

Edit 1

you can create function to select values:

for (int i = 1; i <= 2; i++)
{
     bw.Write(SelectDataForBinaryWriter("A"));
}
...
private int SelectDataForBinaryWriter(string input)
{
    int output = 0;
    switch (input) // edit your own cases here
    {
        case "A":
            output = 0x123;
            break;
        case "B":
            output = 0x456;
            break;
        case "C":
            output = 0x789;
            break;
        default:
            output = some_default_value_here;
            break;
    }

    return output;
}

As I can see, you are writing hex values, so you can also consider returning already parsed value - C# convert integer to hex and back again

String, c# how to compare string a same time

You can, for example, create an array then check if it contains what you search for:

if(new[] { "MS", "VI", "PS" }.Contains(MirePrincipal.Substring(0, 2)))

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