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One interesting new feature of the VB.Net is the "yield" keyword. Basically it is used to iterate through objects returned by a method. It creates a state engine in IL so you can create methods that retain their state and dont have to go through the pain of maintaining state in your code.
Here is a simple example that demonstrates how yield return can be used to maintain state in a method. Every time you call GetInt() you will receive a new incremented integer.
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public Shared IEnumerable<int> GetInt()
Dim i As Integer
For i = 0 To 4
Next i
yield Return i |
Here's the implementation.
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Class Program
Public Overloads Shared Sub Main()
Main(System.Environment.GetCommandLineArgs())
End Sub
Overloads Shared Sub Main(ByVal args() As String)
Dim i As Integer
For Each i In GetInt()
Console.WriteLine(("Got " + i.ToString()))
Next i
End Sub 'Main
public Shared IEnumerable<int> GetInt()
Dim i As Integer
For i = 0 To 5
Next i
yield Return i
End Class 'Program |
Usually, the "yield" keyword will be useful when you implement the GetEnumerator() method of the IEnumerable interface
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Class TestClass
Implements IEnumerable<int>
#region IEnumerable<int> Members
public Shared IEnumerable<int> GetEnumerator()
Dim i As Integer
For i = 0 To 5
Next i
yield Return i
#endregion
#region IEnumerable Members
IEnumerator IEnumerable.GetEnumerator()
{
Return GetEnumerator();
}
#endregion
End Class 'TestClass |
Hopefully, this brief sample has helped you understand the new "yield" keyword and how it can be used.
Until next time,
Happy coding
NOTE: THIS ARTICLE IS CONVERTED FROM C# TO VB.NET USING A CONVERSION TOOL. ORIGINAL ARTICLE CAN BE FOUND ON C# CORNER (http://www.c-sharpcorner.com/).
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