INFO: Supported Data Types for Web Services That Are Called Through the SOAP Protocol or the HTTP Protocol (326791)

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The following table lists the supported data types for the XML Web service methods when you use SOAP.

Type	Description
Primitive Types	Stand primitive types. The complete list of the supported primitives is String, Char, Byte, Boolean, Int16, Int32, Int64, UInt16, UInt32, UInt64, Single, Double, Guid, Decimal, DateTime, and XmlQualifiedName.
Enum Types	Enumeration types.
Class and Structure Types	Class types and structure types with public fields or with properties. The public properties and the fields are serialized.
DataSet Types	ADO.NET DataSet Types.
XmlNode Types	It is an in-memory representation for an XML fragment.
Array Types	Arrays of the previous types.

The previous data types are also supported for the return values of a Web service when an XML Web service is called through the SOAP protocol, the HTTP GET protocol, or the HTTP POST protocol.

The following limited data types are supported when an XML Web service is called through the HTTP GET protocol or the HTTP POST protocol.

The following supported types are limited:

Type	Description
Primitive Types (Limited)	Most stand primitive types. The complete list of the supported primitives is String, Char, Byte, Boolean, Int16, Int32, Int64, UInt16, UInt32, UInt64, Single, Double, Decimal, and DateTime.
Enum Types	Enumeration types.
Array Types	Arrays of the previous types.

Both the by-value parameter and the by-reference (in and out) parameter are supported when you use the SOAP protocol. The HTTP GET protocol and the HTTP POST protocol only support the by-value parameter. The by-reference parameter sends a value both ways by sending a value to the server and then sending the value back to the client.