CODEWITHSUNDEEP
c#arrayscsvstreamreader
Burak
Burak

Reputation: 135

Streamreader and "Index was outside the bounds of the array" error

I didn't write any array length but when i try to read .csv file i get the "Index was outside the bounds of the array" error. .csv file is about 1 000 000 line. Is there anyone to fix this code?

.csv file lines are like below.

0000000,26.0000000000000,38.0000000000000,30.01.2017,0,0,0,,,0,0,,0,,0,0,0,0

string[] read;
char[] seperators = { ',' };


        try
        {
            Image img = Image.FromFile(txtFilePath.Text); 
            Graphics g = Graphics.FromImage(img);
            pictureBox1.Image = img;
            pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;

            StreamReader sr = new StreamReader(txtFile2Path.Text);

            string data;

            while ((data=sr.ReadLine()) !=null)
            {
                read = data.Split(seperators, StringSplitOptions.None);

                float x = float.Parse(read[1]);
                float y = float.Parse(read[2]);
                string z = read[10];
            }
        }


        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

Upvotes: 2

Views: 3723

Answers (1)

Ben
Ben

Reputation: 514

Just to clarify the answer for anyone that ends up here..

        while ((data=sr.ReadLine()) !=null)
        {
            read = data.Split(seperators, StringSplitOptions.None);
            if (read.Length >= 11)
            {
                float x = float.Parse(read[1]);
                float y = float.Parse(read[2]);
                string z = read[10];
            }
        }

When accessing an array that may not be the desired length, check it first.

An Index was outside the bounds of the array exception will only be thrown when a line of code is trying to access an item (N-1) in the array that does not exist - due to the array having less than (N) items

Upvotes: 1

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