DataContractSerializer.DataContractSerializer(Type, Generic IEnumerable, Int32, Boolean, Boolean, IDataContractSurrogate) Constructor

Initializes a new instance of the DataContractSerializer class to serialize or deserialize an object of the specified type. This method also specifies a list of known types that may be present in the object graph, the maximum number of graph items to serialize, parameters to ignore unexpected data, whether or not to use non-standard XML constructs to preserve object reference data in the graph, and a surrogate for custom serialization.

Namespace: System.Runtime.Serialization
Assembly: System.Runtime.Serialization (in system.runtime.serialization.dll)

public DataContractSerializer (
	Type type,
	IEnumerable<Type> knownTypes,
	int maxItemsInObjectGraph,
	bool ignoreExtensionDataObject,
	bool preserveObjectReferences,
	IDataContractSurrogate dataContractSurrogate
public DataContractSerializer (
	Type type, 
	IEnumerable<Type> knownTypes, 
	int maxItemsInObjectGraph, 
	boolean ignoreExtensionDataObject, 
	boolean preserveObjectReferences, 
	IDataContractSurrogate dataContractSurrogate
public function DataContractSerializer (
	type : Type, 
	knownTypes : IEnumerable<Type>, 
	maxItemsInObjectGraph : int, 
	ignoreExtensionDataObject : boolean, 
	preserveObjectReferences : boolean, 
	dataContractSurrogate : IDataContractSurrogate
Not applicable.



A Type that specifies the type of the instances that will be serialized or deserialized.


An IEnumerable of Type that contains the known types that may be present in the object graph.


The maximum number of items in the graph to serialize or deserialize. The default is the value returned by the MaxValue property.


true to ignore the data supplied by an extension of the type upon serialization and deserialization; otherwise, false.


true to use non-standard XML constructs to preserve object reference data; otherwise, false.


An implementation of the IDataContractSurrogate to customize the serialization process.

Exception typeCondition


the number of items exceeds the maximum value.

The following example creates an instance of the DataContractSerializer that specifies the type to serialize or deserialize and an instance of a IEnumerable to contain the known types used during serialization or deserialization. The code also sets the ignoreExtensionDataObject and preserveObjectReferences parameters to true, and specifies an implementation of the IDataContractSurrogate interface to handle legacy types (types that do not have the DataContractAttribute attribute applied). For more information, see the IDataContractSurrogate documentation.

public static void Constructor7()
    // Create a generic List of types and add the known types
    // to the collection.
    List<Type> knownTypeList = new List<Type>();

    // Create an instance of a class that 
    // implements the IDataContractSurrogate interface.
    // The implementation code is not shown here.
    DCSurrogate mySurrogate = new DCSurrogate();

    DataContractSerializer ser =
        new DataContractSerializer(
        64 * 1024,
    // Other code not shown.

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0

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