'How to return multiple keyvalue pairs in c# using foreach loop? [duplicate]

Currently I have written a logic to return multiple key value pairs using for each loop, but it's return just the first key-value pair. My current code is:

 public static string ReturnData(IEnumerable<KeyValuePair<string, string>> abc)
        {
            if (abc != null)
            {
                foreach (KeyValuePair<string, string> item in abc)
                {
                    return $"{{\"{item.Key}\":\"{item.Value}\"}}";
                 }
            return null;
            }
         }
c++sharpienumerablekey-value


Solution 1:[1]

You can use an iterator block to return a list of items

public static IEnumerable<string> ReturnData(IEnumerable<KeyValuePair<string, string>> abc)
{
    if (abc != null)
    {
        foreach (KeyValuePair<string, string> item in abc)
        {
            yield return $"{{\"{item.Key}\":\"{item.Value}\"}}";
        }
    }
}

Solution 2:[2]

Use Enumerable.Select extension:

abc.Select(item => $"{{\"{item.Key}\":\"{item.Value}\"}}");

If you still want to re-use this code, then re-write ReturnData like this:

public static IEnumerable<string> ReturnData(this IEnumerable<KeyValuePair<string, string>> abc)
{
    if (abc != null)
    {
        return abc.Select(item => $"{{\"{item.Key}\":\"{item.Value}\"}}");
    }

    return Enumrable.Empty<string>();
}

Note, that this turns ReturnData into an extension method, which allows to call it this way:

abc.ReturnData();

Sources

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Source: Stack Overflow

Solution Source
Solution 1 TylerH
Solution 2

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