DataObjectMethodAttribute Class

You can use the DataObjectMethodAttribute to identify data operation methods on a type marked with the DataObjectAttribute attribute so that they are more easily identified by callers using reflection. When the DataObjectMethodAttribute attribute is applied to a method, it describes the type of operation the method performs and indicates whether the method is the default data operation method of a type. Components such as the ObjectDataSource control and the ObjectDataSourceDesigner class examine the values of this attribute, if present, to help determine which data method to call at run time.

The following code example demonstrates how you can apply the DataObjectMethodAttribute attribute to a publicly exposed method and identify the type of data operation it performs as well as whether it is the type's default data method. In this example the NorthwindData type exposes two data methods: one to retrieve a set of data named GetAllEmployees, and another to delete data named DeleteEmployeeByID. The DataObjectMethodAttribute attribute is applied to both methods, the GetAllEmployees method is marked as the default method for the Select data operation, and the DeleteEmployeeByID method is marked as the default method for the Delete data operation.

[DataObjectAttribute]
public class NorthwindData
{  
  public NorthwindData() {}

  [DataObjectMethodAttribute(DataObjectMethodType.Select, true)]
  public static IEnumerable GetAllEmployees()
  {
    AccessDataSource ads = new AccessDataSource();
    ads.DataSourceMode = SqlDataSourceMode.DataReader;
    ads.DataFile = "~//App_Data//Northwind.mdb";
    ads.SelectCommand = "SELECT EmployeeID,FirstName,LastName FROM Employees";
    return ads.Select(DataSourceSelectArguments.Empty);
  }

  // Delete the Employee by ID.
  [DataObjectMethodAttribute(DataObjectMethodType.Delete, true)]
  public void DeleteEmployeeByID(int employeeID)
  {
    throw new Exception("The value passed to the delete method is "
                         + employeeID.ToString());
  }
}

.NET Framework

.NET Framework Client Profile

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference