Information regarding Linq select function-CodePudding

I have a list of strings. For instance, the list is {"AbcXYZZ","DEFG","HIJKL","MNOPQR"}. I want to check if the current string's length is greater than 4, then it will divide string into N substrings(strings of length 4). The final output should be like this: {"AbcX","YZZ","DEFG","HIJK","L","MNOP","QR"}

I can use select function to process the pipeline, but I could not think of a way to add the substrings just after the parent string. Any help is appreciated

CodePudding user response：

Try using SelectMany.

For splitting the strings I used the answer found here.

var list = new List<string> { "AbcXYZZ", "DEFG", "HIJKL", "MNOPQR" };

var output = list.SelectMany(x => x.Length > 4 ?
    _split(x, 4) :
    new string[] { x });

static IEnumerable<string> _split(string str, int chunkSize) =>
    Enumerable
        .Range(0, (str.Length   chunkSize - 1) / chunkSize)
        .Select(i => str.Substring(i * chunkSize, Math.Min(str.Length - (i * chunkSize), chunkSize)));

Console.WriteLine(String.Join(";", output));

outputs:

AbcX;YZZ;DEFG;HIJK;L;MNOP;QR