CODEWITHSUNDEEP
c#streamreaderformatexception
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Reputation: 45

Keep getting "Input string not in correct format" when trying to read data from a text file using StreamReader

I've had the error when I was still using double.parse or int.parse in place of ConvertToDouble and ConvertToInt32, respectively. Here's the code:

         ArrayList Webpages = new ArrayList();
         String FileName = "Medium.txt";
         StreamReader newSR = new StreamReader(FileName);
         while (!newSR.EndOfStream)
         {
             string[] data = (newSR.ReadLine()).Split(',');
             Webpage newEntry = new Webpage();
             newEntry.size = Convert.ToDouble(data[0]);
             newEntry.visitCount = Convert.ToInt32(data[1]);
             newEntry.name = data[2];
             Webpages.Add(newEntry);
         }

And the Textfile:

5.26,46,WebPage1
7.44,76,WebPage2
8.35,42,WebPage3
46.2,9,WebPage4
12.44,124,WebPage5
10.88,99,WebPage6
10.66,984,WebPage7

This is my error message:

An unhandled exception of type 'System.FormatException' occurred in mscorlib.dll

Additional information: Input string was not in a correct format. I'm getting the error message by the line that reads: newEntry.size = Convert.ToDouble(data[0])

Upvotes: 1

Views: 1496

Answers (1)

Adem Catamak
Adem Catamak

Reputation: 2009

Computer culture effect your delimeter types. In this case if delimeter is . you can add InvariantCulture options.

    newEntry.size = Convert.ToDouble(data[0], CultureInfo.InvariantCulture);

Also end of file may leads error if there is empty line. This way can be more secure.

 while (!newSR.EndOfStream)
 {
     string line = newSR.ReadLine();
     if(string.IsNullOrEmpty(line)
         break;
     string[] data = (line).Split(',');
     ............

Upvotes: 3

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