Func(TResult) Delegate represents a method with no parameters returning a value of the type specified by the TResult parameter. : Lambda « Language Basics « VB.Net






  1. VB.Net
  2. Language Basics
  3. Lambda

Func(TResult) Delegate represents a method with no parameters returning a value of the type specified by the TResult parameter.

 

Imports System.IO

Delegate Function WriteMethod As Boolean

Module TestDelegate
   Public Sub Main()
      Dim output As New OutputTarget()
      Dim methodCall As WriteMethod = AddressOf output.SendToFile
      If methodCall() Then 
         Console.WriteLine("Success!")
      End If      
   End Sub
End Module

Public Class OutputTarget
   Public Function SendToFile() As Boolean
      Try
         Dim fn As String = Path.GetTempFileName
         Dim sw As StreamWriter = New StreamWriter(fn)
         sw.WriteLine("Hello, World!")
         sw.Close      
         Return True
      Catch
         Return False
      End Try
   End Function
End Class








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5.Predicate(T) Delegate represents the method that defines a set of criteria
6.Converter(TInput, TOutput) Delegate represents a method that converts an object from one type to another type.