What is the difference between ServiceContract, OperationContract, and DataContract?

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In WCF, ServiceContract, OperationContract, and DataContract serve distinct purposes in defining how a service operates and communicates with clients. Here's a clear breakdown: 1. ServiceContract Purpose: Defines the interface (contract) for a WCF service — i.e., what operations the service exposes to clients.Applied To: An interface or class. Example: 2. OperationContract Purpose: Marks individual methods in the service contract that are exposed as operations to clients.Applied To: Methods inside a ServiceContract. Example: Only methods marked with OperationContract are accessible to clients. 3. DataContract Purpose: Defines the structure of complex data types (objects) that are passed in and out of service operations.Applied To: Classes or structs used as parameters or return types. Example: Only members marked with DataMember are serialized for transport. Summary Table Attribute Applied To Purpose ServiceContract Interface/class Defines the service and its public interface OperationContract Method Marks the method as a callable operation DataContract Class/struct Defines complex data structures

Attribute	Applied To	Purpose
`ServiceContract`	Interface/class	Defines the service and its public interface
`OperationContract`	Method	Marks the method as a callable operation
`DataContract`	Class/struct	Defines complex data structures

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What is the difference between ServiceContract, OperationContract, and DataContract?

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1. ServiceContract

2. OperationContract

3. DataContract

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