如何使用 ArrayList 解析 c# 中的结构化文件？

Question

I have a text file like this.

I convert it into a structured format like below.

public static ArrayList ConllToStructured(string filepath)
    {
        ArrayList structuredfile = new ArrayList();
        string currentline;
        int currentsentence = 0;
        //Read conll file and Convert it to a structured Array list
        //First column is sentence number and other 12 columns is conll fileds

        using (StreamReader sr = new StreamReader(filepath, Encoding.UTF8))
        {
            while ((currentline = sr.ReadLine()) != "#end document")
            {
                if (currentline.Contains("#begin document")) continue;
                if (string.IsNullOrEmpty(currentline))
                {
                    currentsentence += 1;
                    continue;
                }

                //parse each line with whitespace and save in array
                var words = currentline.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);

                //Save sentence number and word array into a temp array list
                List<string> templine = new List<string>();
                templine.Add(currentsentence.ToString());
                foreach (var columns in words)
                {
                    templine.Add(columns);
                }


                structuredfile.Add(templine);
            }
        }
        return structuredfile;
    }

But, when I want to access this structured file, I can only access to each row but I can't access each column in rows. I add arrays of string to ArrayList for further access.

Answer 1

From what I understood what you are asking in your question is how from the returned ArrayList you can get given column for given row.

I think it would be a better option to return from this method List<List<string>> . Then later when you want to access specific column in a specific row. You can just do

var structuredFile = ConllToStructured(filepath);
var columnString = structuredFile[rowIndex][colIndex];

But if for some reason you need it to be ArrayList you should know that ArrayList is always from objects. So when you access an element from it you will be returned object, which you need to cast to List<string> so you would do something like this:

var columnString = (structuredFile[rowIndex] as List<string>)[colIndex];