VB.NET BinaryFormatter.Serialize方法代碼示例

' 導入命名空間
Imports System.IO
Imports System.Collections
Imports System.Runtime.Serialization.Formatters.Binary
Imports System.Runtime.Serialization


Module App

    Sub Main()
        Serialize()
        Deserialize()
    End Sub

    Sub Serialize()

        ' Create a hashtable of values that will eventually be serialized.
        Dim addresses As New Hashtable
        addresses.Add("Jeff", "123 Main Street, Redmond, WA 98052")
        addresses.Add("Fred", "987 Pine Road, Phila., PA 19116")
        addresses.Add("Mary", "PO Box 112233, Palo Alto, CA 94301")

        ' To serialize the hashtable (and its key/value pairs),  
        ' you must first open a stream for writing. 
        ' In this case, use a file stream.
        Dim fs As New FileStream("DataFile.dat", FileMode.Create)

        ' Construct a BinaryFormatter and use it to serialize the data to the stream.
        Dim formatter As New BinaryFormatter
        Try
            formatter.Serialize(fs, addresses)
        Catch e As SerializationException
            Console.WriteLine("Failed to serialize. Reason: " & e.Message)
            Throw
        Finally
            fs.Close()
        End Try
    End Sub



    Sub Deserialize()
        ' Declare the hashtable reference.
        Dim addresses As Hashtable = Nothing

        ' Open the file containing the data that you want to deserialize.
        Dim fs As New FileStream("DataFile.dat", FileMode.Open)
        Try
            Dim formatter As New BinaryFormatter

            ' Deserialize the hashtable from the file and 
            ' assign the reference to the local variable.
            addresses = DirectCast(formatter.Deserialize(fs), Hashtable)
        Catch e As SerializationException
            Console.WriteLine("Failed to deserialize. Reason: " & e.Message)
            Throw
        Finally
            fs.Close()
        End Try

        ' To prove that the table deserialized correctly, 
        ' display the key/value pairs.
        Dim de As DictionaryEntry
        For Each de In addresses
            Console.WriteLine("{0} lives at {1}.", de.Key, de.Value)
        Next
    End Sub
End Module

' 導入命名空間
Imports System.IO
Imports System.Collections
Imports System.Windows.Forms
Imports System.Runtime.Serialization.Formatters.Binary
Imports System.Runtime.Serialization

Public Class MainClass

   Public Shared Sub Main()
         Dim formatter As BinaryFormatter = New BinaryFormatter()
         Dim output As FileStream

         Dim fileName As String = "test.dat"

         Dim employee As Employee = New Employee("First Name", "Last Name")

         Try
            output = New FileStream(fileName,FileMode.OpenOrCreate, FileAccess.Write)
  
            formatter.Serialize(output, employee)

            output.Close()
  
         Catch fileException As FileNotFoundException
            Console.WriteLine("File Does Not Exits")
         Catch serializableException As SerializationException
            Console.WriteLine("Error Writing to File")
         Catch formattingException As FormatException
            Console.WriteLine("Invalid Format")
         Catch e As IOException
            Console.WriteLine("Cannot close file")

         End Try



         Dim input As FileStream

         Dim reader As BinaryFormatter = New BinaryFormatter()

         input = New FileStream(fileName, FileMode.Open,FileAccess.Read)

         Try
             Dim em As Employee = CType(reader.Deserialize(input), Employee)
         
             Console.WriteLine(em)
         Catch serializableException As SerializationException
             input.Close() 

             Console.WriteLine("No more records in file")
         End Try

   End Sub

End Class

<Serializable()> Public Class Employee
   Private firstName, lastName As String

   Public Sub New(ByVal first As String, ByVal last As String)
      firstName = first
      lastName = last
   End Sub 

   Public Overrides Function ToString() As String
      Return firstName & " " & lastName
   End Function 

End Class