What is the difference between datacontract and datamember in WCF?
In this article, we learn what datacontract and datamember are in WCF. A datacontract is a formal agreement between a client and service that abstractly describes the data to be exchanged. In WCF, the most common way of serialization is to make the type with the datacontract attribute and each member as datamember.
What are the parameters of [datamember]?
[DataMember] has some parameters, which specify the details about Data Member. The name of these parameters and their functions are given below. This parameter specifies that whether or not, you are required to serialize the default value of a data member.
What is the difference between [datamember] and [data member] in DCS?
without [DataMember], you cannot define an order of serialization (Order=) and the DCS will serialize all properties alphabetically without [DataMember], you cannot define a different name for your property (Name=)
What is the default value of datamember name?
DataMember Name is a string attribute with default value as the name of the method to which it is applied. The DataMember name property is helpful to handle some of the DataContract version issues.
What is Datacontract and DataMember in C#?
A datacontract is a formal agreement between a client and service that abstractly describes the data to be exchanged. In WCF, the most common way of serialization is to make the type with the datacontract attribute and each member as datamember.
Is DataMember attribute required?
DataMember attribute is not mandatory to add to serialize data. When DataMember attribute is not added, old XMLSerializer serializes the data. Adding a DataMember provides useful properties like order, name, isrequired which cannot be used otherwise.
What is the use of Datacontract?
A data contract is a formal agreement between a service and a client that abstractly describes the data to be exchanged. That is, to communicate, the client and the service do not have to share the same types, only the same data contracts.
Why do we use Datacontract in C#?
It is used to get or set the name for DataContract attribute of this type. It is used to get or set the order of serialization and deserialization of a member. It instructs the serialization engine that member must be present while reading or deserializing. It gets or sets the DataMember name.
What is a DataMember?
Data Member are the fields or properties of your Data Contract class. You must specify [DataMember] attribute on the property or the field of your Data Contract class to identify it as a Data Member. DataContractSerializer will serialize only those members, which are annotated by [DataMemeber] attribute.
What is serialization in WCF?
The process forms a sequence of bytes into a logical object; this is called an encoding process. At runtime when WCF receives the logical message, it transforms them back into corresponding . Net objects. This process is called serialization.
What is DataContract attribute?
[DataContract] attribute specifies the data, which is to serialize (in short conversion of structured data into some format like Binary, XML etc.) and deserialize(opposite of serialization) in order to exchange between the client and the Service.
What is message contract in WCF?
A message contract is used to control the structure of a message body and serialization process. It is used to send/access the information in the soap header. By use of a Message Contract we can customize the parameters sent using a SOAP message between the client and the server.
What is service contract in WCF?
A service contract defines the operations which are exposed by the service to the outside world. A service contract is the interface of the WCF service and it tells the outside world what the service can do. It may have service-level settings, such as the name of the service and namespace for the service.
How fault contract is implemented in WCF?
Raise the exception from the service by creating an instance and assigning properties of the custom exception.Step 1: Defining the type using Data Contract. ... Step 2: Decorate the service operation with the FaultContract. ... Step 3: Raise the exception from the service.More items...•
What is KnownType C#?
The KnownType attribute is necessary when you are serializing non-concrete types such as interfaces or base classes. The WCF serializer must know about all possible implementations of the interface or inherited class. Any implementations that it doesn't know about will cause a serialization exception.
What is EmitDefaultValue?
EmitDefaultValue. DataMember EmitDefaultValue is a Boolean attribute with the default value of true. If the value is not provided for DataMember then the corresponding default value will be set to the member for example integer it will be set as 0, for bool it is false, any reference type is null.
What is DataMember attribute?
0. DataMember attribute is not mandatory to add to serialize data. When DataMember attribute is not added, old XMLSerializer serializes the data . Adding a DataMember provides useful properties like order, name, isrequired which cannot be used otherwise.
What is a data contract?
2. A data contract is a formal agreement between a service and a client that abstractly describes the data to be exchanged. Data contract can be explicit or implicit. Simple type such as int, string etc has an implicit data contract. User defined object are explicit or Complex type, for which you have to define a Data contract using [DataContract] ...
Can you leave out a property without datamember?
without [DataMember], you cannot leave out certain public properties - all public properties will be serialized by the DCS.
Can you serialize non-public properties without DataMember?
without [DataMember], you cannot serialize non-public properties or fields.
XML Representation
If the previous example is serialized to XML, the representation is similar to the following.
Interaction with IsRequired
As discussed in Data Contract Versioning, the DataMemberAttribute attribute has an IsRequired property (the default is false ). The property indicates whether a given data member must be present in the serialized data when it is being deserialized.
Schema Representation
The details of the XML Schema definition language (XSD) schema representation of data members when the EmitDefaultValue property is set to false are discussed in Data Contract Schema Reference. However, the following is a brief overview:
Question
Data contracts are used to specify that my Data contracts are going to take part in the service implementation, right ?
Answers
DataContact is the attribute we uses in the class level to specify that this is a data object we are gonna use in our service to transfer data. DataMember is the members of the data contract which has to be available while sending the data between client and the service.
All replies
DataContact is the attribute we uses in the class level to specify that this is a data object we are gonna use in our service to transfer data. DataMember is the members of the data contract which has to be available while sending the data between client and the service.
What is a datamember name?
DataMember Name is a string attribute with default value as the name of the method to which it is applied. The DataMember name property is helpful to handle some of the DataContract version issues. Some data contract changes will break the existing client communication like changing DataMember name, changing DataContract name or namespace, changing the order of DataMembers. In following example, the change to Name DataMember will not be breaking change to existing client communication.
What is the datamember order attribute?
DataMember Order attribute is of type integer. Sometime DataContract should be serialized or deserialized in a specific order of DataMembers. By default, DataMembers are serialized or deserialized in below order.
What is datamember emit default value?
DataMember EmitDefaultValue is a Boolean attribute with the default value of true. If the value is not provided for DataMember then the corresponding default value will be set to the member for example integer it will be set as 0, for bool it is false, any reference type is null. If you do not want to use the default value to set then mark this attribute to false. Marking this as false will help you for reducing request response size and better interoperability.
What is enummember value?
EnumMember value is the string property with default value of the name of enum member to which it is applied. In above example setting DataMember Status = Delivered will result below xml.
