Enumerable.Count<TSource> Method (IEnumerable<TSource>)

Type Parameters

• TSource
  The type of the elements of source.

Parameters

• source
  Type: System.Collections.Generic.IEnumerable<TSource>
  A sequence that contains elements to be counted.

Return Value

Type: System.Int32
The number of elements in the input sequence.

      ' Create an array of strings.
      Dim fruits() As String = {"apple", "banana", "mango", "orange", "passionfruit", "grape"}

      Try
         ' Count the number of items in the array.
         Dim numberOfFruits As Integer = fruits.Count()
         ' Display the output.
         outputBlock.Text &= "There are " & numberOfFruits & " fruits in the collection." & vbCrLf
      Catch e As OverflowException
         outputBlock.Text &= "The count is too large to store as an Int32. Try using LongCount() instead." & vbCrLf
      End Try

      ' This code produces the following output:
      '
      ' There are 6 fruits in the collection.

      string[] fruits = { "apple", "banana", "mango", "orange", "passionfruit", "grape" };

      try
      {
         int numberOfFruits = fruits.Count();
         outputBlock.Text += String.Format(
             "There are {0} fruits in the collection.",
             numberOfFruits) + "\n";

      }
      catch (OverflowException)
      {
         outputBlock.Text += "The count is too large to store as an Int32." + "\n";
         outputBlock.Text += "Try using the LongCount() method instead." + "\n";
      }

      // This code produces the following output:
      //
      // There are 6 fruits in the collection.