How to read in text from a text file and convert the return string to a int value.

[martinsmith160]

Does anyone know how to read in data from a text file and initialize a variable to the string value that was read in from the file. E.g

text file data:
100
200
300

I want to read in each value and assign it to a variable in my code.
This is the code I have done so far just to ilistrate my problem.

            int x;
            int y;

            open_dlg.Filter = "Text documents (.txt)|*.txt";
            if (open_dlg.ShowDialog() == true)
            {
                string fileName = open_dlg.FileName;

                FileInfo theSourceFile = new FileInfo(fileName);

                StreamReader stream = theSourceFile.OpenText();

                name = stream.ReadLine();
                x = stream.Read();
            }

The name assingment works fine because ReadLine() returns a string but the read is returning the wrong value.

[tlhintoq]

X is an int
But when you read from a stream you get a string, even if the string happens to contain a number. You need to convert the string to a number before you assign it to x

string NewValue = stream.readline();
int x = convert.ToInt(NewValue;

[martinsmith160]

Thanks alot that worked great.

[GaryTexmo]

There's an alternate method to convert a string to an integer, which is built right into the type.

int x = int.Parse(NewValue);

That part is basically exactly the same, but the reason I bring it up is because your program will actually throw an exception if the string is not able to be converted to an integer (ie, the string is "45a"). To get around this, you can use the TryParse method from the type.

int x = 0;
if (!int.TryParse(NewValue, out x)
{
  // parse failed, do whatever you need to do
}

These Parse and TryParse methods exist on all the base types I believe.