DataContractResolver Class

.NET Framework (current version)

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Provides a mechanism for dynamically mapping types to and from xsi:type representations during serialization and deserialization.

Namespace:   System.Runtime.Serialization
Assembly:  System.Runtime.Serialization (in System.Runtime.Serialization.dll)


public abstract class DataContractResolver


Initializes a new instance of the DataContractResolver class.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Serves as the default hash function. (Inherited from Object.)


Gets the Type of the current instance.(Inherited from Object.)


Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_pubmethodResolveName(String, String, Type, DataContractResolver)

Override this method to map the specified xsi:type name and namespace to a data contract type during deserialization.


Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubmethodTryResolveType(Type, Type, DataContractResolver, XmlDictionaryString, XmlDictionaryString)

Override this method to map a data contract type to an xsi:type name and namespace during serialization.

Developers should be careful about what data is being sent over the wire. You can use transport or message security to secure that data. For more information, see see Security in WCF.


Only use DataContractResolver if you are completely sure of what information is being serialized. Malicious types can cause unexpected behavior.

The following example shows how to derive a class from DataContractResolver. For a working sample, see DataContractResolver.

class MyDataContractResolver : DataContractResolver
    private Dictionary<string, XmlDictionaryString> dictionary = new Dictionary<string, XmlDictionaryString>();
    Assembly assembly;

    // Definition of the DataContractResolver
    public MyDataContractResolver(Assembly assembly)
        this.assembly = assembly;

    // Used at deserialization
    // Allows users to map xsi:type name to any Type 
    public override Type ResolveName(string typeName, string typeNamespace, Type declaredType, DataContractResolver knownTypeResolver)
        XmlDictionaryString tName;
        XmlDictionaryString tNamespace;
        if (dictionary.TryGetValue(typeName, out tName) && dictionary.TryGetValue(typeNamespace, out tNamespace))
            return this.assembly.GetType(tNamespace.Value + "." + tName.Value);
            return null;
    // Used at serialization
    // Maps any Type to a new xsi:type representation
    public override bool TryResolveType(Type type, Type declaredType, DataContractResolver knownTypeResolver, out XmlDictionaryString typeName, out XmlDictionaryString typeNamespace)
        string name = type.Name;
        string namesp = type.Namespace;
        typeName = new XmlDictionaryString(XmlDictionary.Empty, name, 0); 
        typeNamespace = new XmlDictionaryString(XmlDictionary.Empty, namesp, 0);
        if (!dictionary.ContainsKey(type.Name))
            dictionary.Add(name, typeName);
        if (!dictionary.ContainsKey(type.Namespace))
            dictionary.Add(namesp, typeNamespace);
        return true;

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1

Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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