DataObjectAttribute 類別

定義

public ref class DataObjectAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Class)]
public sealed class DataObjectAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Class)>]
type DataObjectAttribute = class
    inherit Attribute

Public NotInheritable Class DataObjectAttribute
Inherits Attribute

繼承

Object

Attribute

DataObjectAttribute

屬性

AttributeUsageAttribute

範例

以下程式碼範例示範如何套用屬性 DataObjectAttribute 來表示物件適合綁定物件 ObjectDataSource 。 在此範例中， NorthwindData 物件是打算與物件 ObjectDataSource 一起使用。

[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());
  }
}

<DataObjectAttribute()> _
Public Class NorthwindData

  <DataObjectMethodAttribute(DataObjectMethodType.Select, True)> _
  Public Shared Function GetAllEmployees() As IEnumerable
    Dim ads As 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)
  End Function 'GetAllEmployees

  ' Delete the Employee by ID.
  <DataObjectMethodAttribute(DataObjectMethodType.Delete, True)> _
  Public Sub DeleteEmployeeByID(ByVal employeeID As Integer)
    Throw New Exception("The value passed to the delete method is " + employeeID.ToString())
  End Sub

End Class

備註

使用屬性 DataObjectAttribute 來識別物件是否適合被物件 ObjectDataSource 使用。 設計時類別如 類別 ObjectDataSourceDesigner 會使用 屬性 DataObjectAttribute 來呈現適合綁定物件 ObjectDataSource 的物件。

欲了解更多屬性的使用資訊，請參閱屬性。