auto-increment value on Append CSV function in C#

Question

I have a function to add some text in csv file , i add one line in the loop.

Actually i have a 'int' value who i increment in a loop .

But i want to know if is possible to use an auto-increment value like in sql ?

Like this : csv.AppendLine(/*auto-increment*/+";SomeText");

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My code:

I create my value with this:

 private StringBuilder csv ; private int test; 

i initialize it before my loop:

 csv = new StringBuilder(); 

i add my value in my loop

 csv.AppendLine((value++)+";SomeText"); 

and i save it at the end off my loop

 File.WriteAllText("Myfile.csv", csv.ToString()); 

Thanks

Answer 1

One option is, instead of using StringBuilder use List<string> and add the content.

Magic happens when you writing to the file. Use overloaded selector to pass index, and use this index and format the string.

File.WriteAllLines("Myfile.csv", list.Select((x,i) => string.Format("{0};{1}", i,x)));