how-to-read-object-data-from-an-xml-file.md

title	How to: Read Object Data from an XML File (Visual Basic)
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ms.date	07/20/2015
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How to: Read Object Data from an XML File (Visual Basic)

This example reads object data that was previously written to an XML file using the xref:System.Xml.Serialization.XmlSerializer class.

Example

Public Class Book  
    Public Title As String  
End Class  
  
Public Sub ReadXML()  
    Dim reader As New System.Xml.Serialization.XmlSerializer(GetType(Book))  
    Dim file As New System.IO.StreamReader(  
        "c:\temp\SerializationOverview.xml")  
    Dim overview As Book  
    overview = CType(reader.Deserialize(file), Book)  
    Console.WriteLine(overview.Title)  
End Sub  

Compiling the Code

Replace the file name "c:\temp\SerializationOverview.xml" with the name of the file containing the serialized data. For more information about serializing data, see How to: Write Object Data to an XML File (Visual Basic).

The class must have a public constructor without parameters.

Only public properties and fields are deserialized.

Robust Programming

The following conditions may cause an exception:

• The class being serialized does not have a public, parameterless constructor.

• The data in the file does not represent data from the class to be deserialized.

• The file does not exist (xref:System.IO.IOException).

.NET Framework Security

Always verify inputs, and never deserialize data from an untrusted source. The re-created object runs on a local computer with the permissions of the code that deserialized it. Verify all inputs before using the data in your application.

See Also

xref:System.IO.StreamWriter
How to: Write Object Data to an XML File (Visual Basic)
Serialization (Visual Basic)
Visual Basic Programming Guide