Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
JavaScriptTypeResolver Class

JavaScriptTypeResolver Class

Provides the abstract base class for implementing a custom type resolver.


Namespace:  System.Web.Script.Serialization
Assembly:  System.Web.Extensions (in System.Web.Extensions.dll)

public abstract class JavaScriptTypeResolver

The JavaScriptTypeResolver type exposes the following members.

Protected methodJavaScriptTypeResolverInitializes a new instance of the JavaScriptTypeResolver class.

Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodResolveTypeWhen overridden in a derived class, returns the Type object that is associated with the specified type name.
Public methodResolveTypeIdWhen overridden in a derived class, returns the type name for the specified Type object.
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)

The JavaScriptTypeResolver class provides the services for:

  • Converting managed type information to a string value through the ResolveTypeId method.

  • Resolving a string value back to the appropriate managed type through the ResolveType method.

When the JavaScriptSerializer object serializes custom types, it can optionally include in the serialized JavaScript Object Notation (JSON) string a value that contains type information. During deserialization, JavaScriptSerializer can then reference this string value to determine the appropriate managed type to which the JSON string will be converted.

If you provide a type resolver to the JavaScriptSerializer instance, the serializer will use the ResolveTypeId and ResolveType methods to map between the managed type and the string value during the serialization and deserialization process, respectively.

The JavaScriptTypeResolver class is the base class for the SimpleTypeResolver class, which provides an implementation of a type resolver that uses the managed type assembly-qualified name.

Notes to Inheritors

When you implement a type resolver, the string that is returned by the ResolveTypeId method must map back to the same managed type when the string value is passed to the ResolveType method.

The following example demonstrates how to create a custom type resolver.

public class CustomTypeResolver : JavaScriptTypeResolver
    public override Type ResolveType(string id)
        return Type.GetType(id);

    public override string ResolveTypeId(Type type)
        if (type == null)
            throw new ArgumentNullException("type");

        return type.Name;

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
© 2015 Microsoft