CODEWITHSUNDEEP
c#
user9710116
user9710116

Reputation:

How to append to a List of strings with values from another List?

I have a basic List that looks something like this:

List<string> gameNames = new List<string>()
{
    "Zelda",
    "Mario",
    "Metroid",
    "Splatoon",
    "Xenoblade",
};

I have another List that looks something like this:

List<string> gameData = new List<string>()
{
    ", Nintendo, Nintendo, 2017",
    "Mario, Nintendo, Nintendo, 2017",
    ", Nintendo, Nintendo, 2017",
    ", Nintendo, Nintendo, 2017",
    "Xenoblade, Nintendo, Monolith, 2017",
};

I want to replace the first "," of the gameData List with the respective value in the same index of gameNames.

So, the first element should look like:

"Zelda, Nintendo, Nintendo, 2017"

Right now, I am using a Zip method that appends the data, but it doesn't check to see if the value is ',', it just appends no matter what.

Here is an example:

List<string> gameData= gameNames.Zip(gameData, (x, y) => x + "," + y).ToList();

Upvotes: 1

Views: 71

Answers (2)

Cee McSharpface
Cee McSharpface

Reputation: 8726

I would suggest to add the leading comma logic to the lambda, and leave everything else intact:

var merged = gameNames.Zip(gameData, (x, y) => x + (y.StartsWith(", ") ? String.Empty : ", ") + y).ToList();

So it uses the leading comma where present, and inserts one where missing.

Second version after clarification in OP:

var merged = gameNames.Zip(gameData, (x, y) => (y.StartsWith(", ") ? x + y : y)).ToList();

This keeps the value of gameNames whenever it does not start with a comma+space, else concatenates.

Upvotes: 3

Subodh S
Subodh S

Reputation: 115

You can try this:

for (int i = 0; i < gameData.Count(); i++)
{
   gameData[i] = gameNames[i] + gameData[i].Substring(gameData[i].IndexOf(","));
}

gameData[i].IndexOf(",") above will find the position of first "," and Substring will extract content after first ",". Then append contents from gameNames list.

Upvotes: 1

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