Find an element in Array ( .NET )

Most of us will often need to find an element in an array.  In C or C++, we can do this by using the FOR loops. In .NET 2.0, we have a build-in method, which is very simple and powerful too. It is similar to ArrayList’s Contains method. The following code snippet will show this. 

Private Function MyMethod() as string
  Dim countryCodes() As String
  countryCodes = “IND,CHI,JPN”.Split(“,”.ToCharArray)
  If Array.Exists(countryCodes, AddressOf CountryCodeStartsWith) Then
  Return “Exists”
  Return “Not Exists”
  End If
End Function

Private Function CountryCodeStartsWith(ByVal countryCode As String) As Boolean
  dim Country as string = “INDIA”
  If Country.startsWith(countryCode) Then
     Return True
     Return False
  End If
End Function

The Array.Exists has two parameters. The first one is nothing but an array where the element is to searched. The second part of the code , which will be confusing for beginners, is a delegate for the function. At the time of execution the elements in CountryCodes – Our Array – will be passed as a parameter to this delegate. also we can customize this matching function very easily.
Hope this will help you.


Difference between two Dates in C#.NET ?

To find the difference between two dates is very simple in VB — By using DateDiff method. But in C#, there is no direct method to do so. but there is a way to achive this. For this we need to understand TimeSpan Class.

The following code snippet will show you how to find the difference.

DateTime startTime = DateTime.Now;
DateTime endTime = DateTime.Now.AddSeconds( 75 );
TimeSpan span = endTime.Subtract ( startTime );
Console.WriteLine( “Time Difference (seconds): ” + span.Seconds );
Console.WriteLine( “Time Difference (minutes): ” + span.Minutes );
Console.WriteLine( “Time Difference (hours): ” + span.Hours );
Console.WriteLine( “Time Difference (days): ” + span.Days );

By concatenating all this you will get the difference between two dates. You can also use span.Duration().

There are certain limitations to. The TimeSpan is capable of returning difference interms of Days, Hours, mins and seconds only. It is not having a property to show difference interms of Months and years.

Hope this will help you…