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For a CLR interface to participate in the services provided by WCF, it must be adorned with the [ServiceContract] attribute Like many other NET attributes, the ServiceContractAttribute type supports many properties that further qualify its intended purpose You can set two properties, Name and Namespace, to control the name of the service type and the name of the XML namespace that defines the service type If you use a web service specific binding, you use these values to define the <portType> elements of the related WSDL document Here, you do not bother to assign a Name value because the default name of the service type is directly based on the C# class name However, the default name for the underlying XML namespace is simply http://tempuriorg (you should change this for all of your WCF services).

In practice, you ll need to store several provider-specific details in a configuration file. Not only do you need to retrieve the provider name, but you ll also need to get a connection string. You might also need to retrieve queries or stored procedure names if you want to avoid hard-coding them because they might change. It s up to you to determine the ideal trade-off between development complexity and flexibility.

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When you build a WCF service that will send and receive custom data types (which you are not currently doing), it is important that you establish a meaningful value to the underlying XML namespace because this ensures that your custom types are unique As you might know from your experience building XML web services, XML namespaces provide a way to wrap your custom types in a unique container to ensure that your types do not clash with types in another organization For this reason, you can update your interface definition with a more fitting definition, which, much like the process of defining an XML namespace in a NET Web Service project, is typically the URI of the service s point of origin, as in the following example: [ServiceContract(Namespace = "http://MyCompanycom")] public interface IEightBall { ...

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} Beyond Namespace and Name, the [ServiceContract] attribute can be configured with the additional properties shown in Table 25-6 Be aware that some of these settings will be ignored, depending on your binding selection Table 25-6 Various Named Properties of the [ServiceContract] Attribute.

The strength of the encryption corresponds to the length of the key. Keep in mind that the greater the key size, the harder it is for a brute-force attack to succeed, because there are far more possible key values to test. Of course, greater symmetric key sizes also lead to larger messages and slower encryption times. For most purposes, a good standard choice is Rijndael. It offers solid performance and support for large key sizes.

Establishes whether this service contract requires callback functionality for two-way message exchange (e.g., duplex bindings). You use this name to locate the service element in an application configuration file. The default is the name of the service implementation class. Allows you to specify the degree to which the contract binding requires encryption, digital signatures, or both for endpoints that expose the contract.

public class Group { @Id @GeneratedValue(strategy = IDENTITY) @Column(name="user_id") private Integer groupId; @Column(name="group_name") private String groupName; @Column(name="group_description") private String groupDescription;

DES, TripleDES, and RC2 are all implemented using the CryptoAPI and thus need the high encryption pack on Windows 2000. Note also that the key length for DES and TripleDES include parity bits that don t contribute to the strength of the encryption. TripleDES with a 192-bit key uses only 168 bits, while a 128-bit key uses 112 bits. In DES, the 64-bit key uses only 56 bits. For that reason, it s considered fairly weak, and you should use other key algorithms instead. For additional information about the relative strengths of these algorithms, consult a dedicated book or Internet resource about encryption theory, such as Bruce Schneier s Applied Cryptography: Protocols, Algorithms, and Source Code in C, Second Edition (Wiley, 1995).

Table 25-6. Various Named Properties of the [ServiceContract] Attribute (continued)

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