在 2d 或锯齿状数组中用逗号和新空格分割字符串并在 c# 中访问项目

Question

Hi there I have a text file like this, many lines 2 columns

CF7CED1BF035345269118A15EF2D45A06, product1
CF7CED1BF035345269118A15EF2D45A09, product2
....
...
...
...

I need to split this and access each field, more precise I need to make a loop that creates many files like product1.txt product2.txt etc and will enclose the codes on its left.

So I need to create files with filenames of columns [2] of all lines and enclose the column[1] as value of each line

I know how to do basic stuff in arrays, like read all lines and store them, but i don't know how to make a loop that will read both field 1 then 2 of LINE 1, create the file and store (I know how to read and save to file) and go on on next LINE 2 and go on field 1 and field 2 again and so on.

Someone suggested using jagged arrays would be faster than 2d arrays

Answer 1

"When you use ReadLines, you can start enumerating the collection of strings before the whole collection is returned; when you use ReadAllLines, you must wait for the whole array of strings be returned before you can access the array. Therefore, when you are working with very large files, ReadLines can be more efficient."

string path_read = @"c:\read\file.txt";
//Path to save resulting files.
string path = @"c:\temp\";
char[] comma = new char[1]{','};
//ASSUMPTION: Your every row has comma separated 2 values. 
//Do a for loop.
//Code now use File.ReadLines
foreach (var currentLine in File.ReadLines(path_read))
{
   string[] itemArray = currentLine.Split(comma, StringSplitOptions.RemoveEmptyEntries);
   // Your item array now has 2 values from 2 columns in the same row. 
   // Do whatever with it.
   File.WriteAllText(path+itemArray[1]+".txt", itemArray[0], Encoding.UTF8);
}

Answer 2

Do you need to keep the contents for any further use? if the intent is to read and the save the contents to separate files then there is no need for a separate array.

using (var reader = new StreamReader(@"input.txt"))
        {
            while (!reader.EndOfStream)
            {
                var inputText = reader.ReadLine();
                var splitText = inputText.Split(',');

                File.AppendAllLines(splitText[1] + ".txt", new List<string> {splitText[0]});
            }
        }