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JavascriptCallbackBehaviorAttribute Class

JavascriptCallbackBehaviorAttribute Class

.NET Framework 4.6 and 4.5

A contract behavior that allows you to set the URL query string parameter name to something other than the default “callback”.


Namespace:  System.ServiceModel.Web
Assembly:  System.ServiceModel.Web (in System.ServiceModel.Web.dll)

[AttributeUsageAttribute(AttributeTargets::Class, AllowMultiple = false)]
public ref class JavascriptCallbackBehaviorAttribute sealed : public Attribute, 

The JavascriptCallbackBehaviorAttribute type exposes the following members.

Public methodJavascriptCallbackBehaviorAttributeInitializes a new instance of the JavascriptCallbackBehaviorAttribute class.

Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
Public propertyUrlParameterNameGets or sets the URL query string parameter name to use for cross-domain script access.

Public methodAddBindingParametersAn implementation of the AddBindingParameters method.
Public methodApplyClientBehaviorAn implementation of the ApplyClientBehavior method.
Public methodApplyDispatchBehaviorAn implementation of the ApplyDispatchBehavior method.
Public methodEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public methodGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodValidateAn implementation of the Validate method.

Explicit interface implemetationPrivate method_Attribute::GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute::GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute::GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute::InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)

JSONP is a mechanism used to enable cross-site, scripting support in Web browsers. It involves sending a request with a callback function name provided as a URL query string parameter value. The service returns a response with the usual JSON payload wrapped in the call to the provided callback function as if it were a line of executable code.

The following is an example of a URL used to call a service: http://baseAddress/Service/RESTService?callback=functionName. When invoked, the service responds with the following JSON.

functionName({ “root”:”Something});

The JavascriptCallbackBehaviorAttribute allows developers to specify the name of the URL query string parameter to interpret as the callback parameter. The default value is “callback” (not case sensitive).

The following example shows how this attribute is applied to a service contract.

public class Service1
    public string GetData()
         // ...

This attribute only applies when it marks a service contract type that is used with the WebHttpBinding and the CrossDomainScriptAccessEnabled property of the binding is set to true.

.NET Framework

Supported in: 4.6, 4.5, 4

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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