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This article mainly explains "what is the significance of ADO.NET annotations in programming". The explanation in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the significance of ADO.NET annotations in programming"?

The ADO.NET annotation enables you to modify the names of elements in a typed DataSet without modifying the infrastructure. If you change the name of an element in the infrastructure, the typed DataSet references objects that do not exist in the data source, and references to objects that exist in the data source are lost.

With annotations, you can customize the names of objects in the typed DataSet with more meaningful names, making the code easier to read and the typed DataSet easier to use for the client while keeping the infrastructure unchanged. For example, the following schema element of the Customers table in the Northwind database generates the DataRow object name CustomersRow and a DataRowCollection named Customers.

The DataRowCollection name Customers makes sense in the client code, but the DataRow name CustomersRow can be misleading because it is a single object. In addition, in general, the object will not be referenced using the Row identifier, but will only be referenced as a Customer object. The solution is to add ADO.NET annotations to the schema and identify the new names of DataRow and DataRowCollection objects. The following is an annotated version of the previous architecture.

Specifying the value of typedName as Customer generates the DataRow object name Customer. Specifying the value of typedPlural as Customers retains the DataRowCollection name Customers.

To use typed DataSet annotations, the following xmlns references must be included in the XML Schema definition language (XSD) schema.

Xmlns:codegen= "urn:schemas-microsoft-com:xml-msprop"

The following is an example of an ADO.NET annotation schema that exposes the Customers table of the Northwind database and contains the relationship to the Orders table.

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