Lessons Learned From C# Log Parsing File

(1) To check for the existence of a file be sure to prefix System.IO:

Image1.Visible = System.IO.File.Exists(imagePath);

(2) For Loops are as follows:

	for (int a =0; a<5;>
2.	{
3.	System.Console.WriteLine(a);
4.	}

(3) Read a file and split it up as an array as follows:

//variable "myFile"
  StreamReader srRead = File.OpenText(fileName);
  srRead.BaseStream.Seek(0, SeekOrigin.Begin);
     
   while (srRead.Peek() > -1)
   {
    myFile = myFile + srRead.ReadLine() + "\n";
   }   
  
  //Close the file
  srRead.Close();
  
  //Split the file into an array
  //using a newline character as the split character
  char[] splitChar  = {'\n'};
  string [] fileArray;
  fileArray = myFile.Split(splitChar);
  

(4) Create a member function that tests using regex's as follows:

 // Function to test for Positive Integers with zero inclusive

  public bool IsWholeNumber(string strNumber)
  {
    Regex objNotWholePattern=new Regex("[^0-9]");

    return !objNotWholePattern.IsMatch(strNumber);


(5) DateTimes are as follows. Make certain to use the correct parameter order. It is not intuitive:

private DateTime dtDob;
 private DateTime dtNow;
 private DateTime dtAge;
 private int intDay;
 private int intMonth;
 private int intYear;
 private int intHour;
 private int intMinute;
        private TimeSpan tsAge;

 dtNow=DateTime.Now;

 dtDob=new DateTime(intYear,intMonth,intDay,intHour,intMinute,0);

When you subtract one DateTime from another you get a TimeSpan, not a number.

(5) Slicing a string:

string result = param.Substring(startIndex, length);


(6) Converting a string to an Int:

string myStr = "123";
    int myParsedInt = Int32.Parse(myStr);

(7) Object Oriented Hello World


     using System;

     public class HelloWorld

     {

     public void helloWorld()

     {

     Console.WriteLine("HELLO WORLD");

     }

     

     public static void Main()

     {

     HelloWorld hw = new HelloWorld();

     hw.HelloWorld();

     }

     }





(9) Incredibly, in the 1.1 version of C# you cannot test ints and most other objects to see if they are null. You can only test a string. You must therefore create an indicator string that you set to a value whenever you set an int variable to a non-null value. Then you test that string. Unbelievable.