How to read a text file and add the data to a int array in C#?

Question

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I'm trying to read a text file which contains numbers separated by a comma. I need to convert it in to a int array and then display the values of array

The contents of the text file: 1,2,2,1,3

how should i do it?

Posted 30-Apr-13 23:53pm

Naman2007

Updated 5-Sep-17 15:17pm

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6 solutions

Solution 1

Read the text into a string variable and use the Split() method to create an array of the individual elements. Then use something like Int32.Parse() to convert each element to an integer and store in a new array.

Posted 30-Apr-13 23:57pm

Richard MacCutchan

Solution 5

Read the content of the text file using the System.IO namespace and the File.ReadAllText() method and store it in a string variable. Split the string by (,). Then loop through the string using for.. loop construct and fetch it into an integer array as you wanted.

Hope this help. If you have any addition help try to post what you have accomplished so far then, brothers can look at what you are not doing right and assist you.

Posted 1-May-13 1:08am

ahmedfaruk88

Solution 2

There are a couple of ways to do it:
1) Read the file as a string, and use string.Split to break it into numbers:

C#

string s = File.ReadAllText(path);
string[] numbers = s.Split(',');

You can then loop through each number and use int.Parse to convert the string value into an integer, and store it in an array or a List<int>
2) Treat the file as Comma Separated Values, and use one of the many converters available. Here is one: A Fast CSV Reader[^]

The first is simple to implement, the second takes a little more work. But it's worth considering the second, because it may be easier to use in the future, should your data change for any reason.

Posted 30-Apr-13 23:59pm

OriginalGriff

Solution 6

string str= File.ReadAllText(path);
int[] result=new int[100];
for (int i = 0; i < str.Split(',').Length; i++)
{
result[i] = Convert.ToInt32(str.Split(',')[i]);

}

Posted 1-May-13 1:52am

Ram424

Updated 1-May-13 18:02pm

v2

Solution 3

C#

List<int> column0 = new List<int>();
                using (Stream stream = File.Open(@"C:\def.txt", FileMode.Open))
                using (TextReader sr = new StreamReader(stream, Encoding.UTF8))
                    {
                        string line;
                        while ((line = sr.ReadLine()) != null)
                            {
                                 string[] arr = line.Split(',');
                                 ....................
                                 // how do i code here


                            }

Posted 1-May-13 0:08am

Naman2007

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Hitesh Gohel · Accepted Answer · 2013-05-01T00:45:00

Hello,

Please Try this code..
In .aspx page

ASP.NET

<div  runat="server" id="DisplayText"></div>

In .cs page

C#

List<int> column0 = new List<int>();
using (Stream stream = File.Open(@"D:\def.txt", FileMode.Open))

using (TextReader sr = new StreamReader(stream, Encoding.UTF8))
{
    string line;
    while ((line = sr.ReadLine()) != null)
    {
        string[] arr = line.Trim().Split(',');
        foreach (var item in arr)
        {
            column0.Add(Convert.ToInt32(item));
        }
    }

    int[] intArray = column0.ToArray();
    if (intArray.Count() > 0)
    {
        foreach (var itemint in intArray)
        {
            Label display = new Label();
            display.Text = itemint.ToString() + ",";
            DisplayText.Controls.Add(display);
        }
    }
}