C# compare char in string with array

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C# how do you compare a combination of letters in a string with an array.

I would like something like this:
string value = bbadc

string[] arr = baddc, abcdb, aabbd, caadb;

The result of the search should be arr[1];
Is this possible and how?

Posted 7-Dec-15 11:31am

Member 11380736

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Member 12160712 7-Dec-15 17:53pm

I am not sure I understand your question, have you misspelled any of the values of the array or the string value, there is no match in the array with the value!

Philippe Mori 7-Dec-15 18:06pm

Use tag code and fix your code to show ' and ".

Patrice T 7-Dec-15 18:27pm

You need to learn C# syntax first.

PIEBALDconsult 7-Dec-15 18:33pm

That depends on the lengths of the strings and how many times you need to search -- if the strings are like what you present and you search only once, then just iterate the array.

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User 7407470 · Answer 1 · 2015-12-07T14:56:00

How about this?

C#

public class YourClass
{
    // ...

    // Compares chars in string 'value' with chars in strings of string array 'arr'
    // returns -1 if no match, otherwise returns arr index of first match
    private int CompareStringChars(string value, string[] arr)
    {
        string s = value.Alphabetize();
        for (int i = 0; i < arr.Length; i++)
        {
            if (s == arr[i].Alphabetize()) return i;
        }
        return -1;
    }
}

// Thanks to Dot Net Perls: http://www.dotnetperls.com/alphabetize-string
public static class StringExtensions
{
    // Sorts (alphabetizes) chars in a string
    public static string Alphabetize(this string s)
    {
        char[] a = s.ToCharArray();
        Array.Sort(a);
        return new string(a);
    }
}

BillWoodruff · Answer 2 · 2015-12-07T19:14:00

.NET 3.5 and later provide the Enumeralbe.SequenceEqual method which can be handy in a case like this:

C#

// required
using System.Linq;

// in some NameSpace/Class ...

string svalue = "bbadc";

string[] arr = new string[]{"baddc", "abcdb", "aabbd", "caadb"};

// note returns both match and index of the match
// if a match is not found out variables returned as "" and -1
private bool TryParseStringMatch(string sval, string[] sary, out string match, out int ndx)
{
    sval = new string(sval.OrderBy(ch => ch).ToArray());

    bool isMatch = false;

    match = "";
    ndx = -1;

    for(int i = 0; i < sary.Length; i++)
    {
        string str = sary[i];

        isMatch = sval.SequenceEqual(new string(str.OrderBy(ch => ch).ToArray()));

        if (isMatch)
        {
            ndx = i;
            match = str;
            return true;
        }
    }

    return isMatch;
}

// sample test: put this code in some method, or EventHandler
string amatch;
int ndex;

if (TryParseStringMatch(svalue, arr, out amatch, out ndex))
{
   // set break-point here: examine values
}

If this method was something being called frequently, or was used to compare some string with a very large list of possible matches, I would order the strings by using the technique shown in Peter Vegter's answer here: converting the string to a char[], then sorting that array ... rather than, as shown here, using Linq to sort.

I've chosen to implement this method in a way that imitates the frequent .NET methods that begin with 'TryParse.

C# compare char in string with array

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