How to: Read Object Data from an XML File (C#)

This example reads object data that was previously written to an XML file using the XmlSerializer class.

Example

public class Book  
{  
    public String title;  
}         
  
public void ReadXML()  
{  
    // First write something so that there is something to read ...  
    var b = new Book { title = "Serialization Overview" };  
    var writer = new System.Xml.Serialization.XmlSerializer(typeof(Book));  
    var wfile = new System.IO.StreamWriter(@"c:\temp\SerializationOverview.xml");  
    writer.Serialize(wfile, b);  
    wfile.Close();  
  
    // Now we can read the serialized book ...  
    System.Xml.Serialization.XmlSerializer reader =   
        new System.Xml.Serialization.XmlSerializer(typeof(Book));  
    System.IO.StreamReader file = new System.IO.StreamReader(  
        @"c:\temp\SerializationOverview.xml");  
    Book overview =  (Book)reader.Deserialize(file);  
    file.Close();  
  
    Console.WriteLine(overview.title);  
  
}  

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 (C#).

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 (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