SurrogateSelector Class
Definition
Important
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Assists formatters in selection of the serialization surrogate to delegate the serialization or deserialization process to.
public ref class SurrogateSelector : System::Runtime::Serialization::ISurrogateSelector
public class SurrogateSelector : System.Runtime.Serialization.ISurrogateSelector
[System.Runtime.InteropServices.ComVisible(true)]
public class SurrogateSelector : System.Runtime.Serialization.ISurrogateSelector
type SurrogateSelector = class
interface ISurrogateSelector
[<System.Runtime.InteropServices.ComVisible(true)>]
type SurrogateSelector = class
interface ISurrogateSelector
Public Class SurrogateSelector
Implements ISurrogateSelector
- Inheritance
-
SurrogateSelector
- Derived
- Attributes
- Implements
Examples
The following code example shows how to make a serialization surrogate class that knows how to properly serialize or deserialize a class that is not itself serializable. In addition, this example also shows how to recover from a SerializationException.
using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters;
using System.Runtime.Serialization.Formatters.Binary;
// This class is not serializable.
class Employee
{
public String name, address;
public Employee(String name, String address)
{
this.name = name;
this.address = address;
}
}
// This class can manually serialize an Employee object.
sealed class EmployeeSerializationSurrogate : ISerializationSurrogate
{
// Serialize the Employee object to save the object's name and address fields.
public void GetObjectData(Object obj,
SerializationInfo info, StreamingContext context)
{
var emp = (Employee) obj;
info.AddValue("name", emp.name);
info.AddValue("address", emp.address);
}
// Deserialize the Employee object to set the object's name and address fields.
public Object SetObjectData(Object obj,
SerializationInfo info, StreamingContext context,
ISurrogateSelector selector)
{
var emp = (Employee) obj;
emp.name = info.GetString("name");
emp.address = info.GetString("address");
return emp;
}
}
public sealed class App
{
static void Main()
{
// This sample uses the BinaryFormatter.
IFormatter formatter = new BinaryFormatter();
// Create a MemoryStream that the object will be serialized into and deserialized from.
using (Stream stream = new MemoryStream())
{
// Create a SurrogateSelector.
var ss = new SurrogateSelector();
// Tell the SurrogateSelector that Employee objects are serialized and deserialized
// using the EmployeeSerializationSurrogate object.
ss.AddSurrogate(typeof(Employee),
new StreamingContext(StreamingContextStates.All),
new EmployeeSerializationSurrogate());
// Associate the SurrogateSelector with the BinaryFormatter.
formatter.SurrogateSelector = ss;
try
{
// Serialize an Employee object into the memory stream.
formatter.Serialize(stream, new Employee("Jeff", "1 Microsoft Way"));
}
catch (SerializationException e)
{
Console.WriteLine("Serialization failed: {0}", e.Message);
throw;
}
// Rewind the MemoryStream.
stream.Position = 0;
try
{
// Deserialize the Employee object from the memory stream.
var emp = (Employee) formatter.Deserialize(stream);
// Verify that it all worked.
Console.WriteLine("Name = {0}, Address = {1}", emp.name, emp.address);
}
catch (SerializationException e)
{
Console.WriteLine("Deserialization failed: {0}", e.Message);
throw;
}
}
}
}
// This code produces the following output.
//
// Name = Jeff, Address = 1 Microsoft Way
Remarks
A serialization surrogate gives the users an object that can handle the serialization requirements of a different object and can transform the serialized data if necessary.
Constructors
SurrogateSelector() |
Initializes a new instance of the SurrogateSelector class. |
Methods
AddSurrogate(Type, StreamingContext, ISerializationSurrogate) |
Adds a surrogate to the list of checked surrogates. |
ChainSelector(ISurrogateSelector) |
Adds the specified ISurrogateSelector that can handle a particular object type to the list of surrogates. |
Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
GetHashCode() |
Serves as the default hash function. (Inherited from Object) |
GetNextSelector() |
Returns the next selector on the chain of selectors. |
GetSurrogate(Type, StreamingContext, ISurrogateSelector) |
Returns the surrogate for a particular type. |
GetType() |
Gets the Type of the current instance. (Inherited from Object) |
MemberwiseClone() |
Creates a shallow copy of the current Object. (Inherited from Object) |
RemoveSurrogate(Type, StreamingContext) |
Removes the surrogate associated with a given type. |
ToString() |
Returns a string that represents the current object. (Inherited from Object) |