Data​Contract​Resolver Class

Definition

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

public abstract class DataContractResolver
Inheritance
DataContractResolver
Derived

Inherited Members

System.Object

Examples

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);
        }
        else
        {
            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;
    }
}

Remarks

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.

Warning

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

Constructors

Data​Contract​Resolver()

Initializes a new instance of the DataContractResolver class.

Methods

Resolve​Name(​String, ​String, ​Type, ​Data​Contract​Resolver)

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

Try​Resolve​Type(​Type, ​Type, ​Data​Contract​Resolver, ​Xml​Dictionary​String, ​Xml​Dictionary​String)

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