How can I get the index of second comma?-CodePudding

        //read
        Console.Write("Please enter (pyramid slot number,block letter,whether or not the block should be lit): ");
        string csvString = Console.ReadLine();

        //location of comma
        int firstComma = csvString.IndexOf(',');
        int secondComma = csvString.IndexOf(',', firstComma   1);

        //extract slot number of pyramid
        int slotNumber = int.Parse(csvString.Substring(0, firstComma));
        string blockLetter = csvString.Substring(firstComma   1, secondComma);
        Boolean lit = Boolean.Parse(csvString.Substring(secondComma   1));

        //print
        Console.WriteLine("Pyramid Slot Number: "   slotNumber);
        Console.WriteLine("Block Letter: "   blockLetter);
        Console.WriteLine("Lit: "   lit);

I tried to input like "5,M,true". However output for Block Letter is "M,t". If I try to input 15 instead of 5, then it gives "M,tr". In the end, I want to get only one letter. I'll use char after I figure this problem out.

Edit: char blockLetter = char.Parse(csvString.Substring(firstComma 1, 1)); I used this thank you!

CodePudding user response：

As I understand, based on code provided, you want the values delimited by commas. If I guessed correctly, then better use String.Split method.

CodePudding user response：

If your CSV file contains the data you anyway read, you could just split the string on comma and then extract individual fields by indices. Here is an example:

var csvEntry = "5,M,true";
var entryData = csvEntry.Split(',');

var slotNumber = int.Parse(entryData[0]);
var blockLetter = entryData[1];
var lit = bool.Parse(entryData[2]);

Console.WriteLine($"Pyramid Slot Number: {slotNumber}");
Console.WriteLine($"Block Letter: {blockLetter}");
Console.WriteLine($"Lit: {lit}");

CodePudding user response：

The first parameter of String.Substring is the start index, the second parameter is not the end index but the length. So you need to calculate it:

int startIndex = firstComma   1;
int length = secondComma - startIndex;
string blockLetter = csvString.Substring(startIndex, length);

An easier way is to use String.Split to get a string[] with all tokens delimited by comma:

string[] allSlots = csvString.Split(',');
// first token is in allSlots[0] and second in allSlots[1]