DataObjectAttribute 构造函数

定义

命名空间:

System.ComponentModel

程序集:

netstandard.dll, System.ComponentModel.TypeConverter.dll

初始化 DataObjectAttribute 类的新实例。

重载

名称	说明
DataObjectAttribute()	初始化 DataObjectAttribute 类的新实例。
DataObjectAttribute(Boolean)	初始化类的新实例 DataObjectAttribute ，并指示对象是否适合绑定到对象 ObjectDataSource 。

DataObjectAttribute()

Source:

DataObjectAttribute.cs

初始化 DataObjectAttribute 类的新实例。

public:
 DataObjectAttribute();

public DataObjectAttribute();

Public Sub New ()

示例

下面的代码示例演示如何使用 DataObjectAttribute() 构造函数。

[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

注解

使用DataObjectAttribute()构造函数时，该IsDataObject属性将设置为true该属性。

DataObjectAttribute(Boolean)

Source:

DataObjectAttribute.cs

初始化类的新实例 DataObjectAttribute ，并指示对象是否适合绑定到对象 ObjectDataSource 。

public:
 DataObjectAttribute(bool isDataObject);

public DataObjectAttribute(bool isDataObject);

new System.ComponentModel.DataObjectAttribute : bool -> System.ComponentModel.DataObjectAttribute

Public Sub New (isDataObject As Boolean)

参数

isDataObject

Boolean

true 如果对象适合绑定到对象 ObjectDataSource ，则为 ;否则为 false。

注解

使用 DataObjectAttribute(Boolean) 构造函数向设计时类指示，例如 ObjectDataSourceDesigner 应将对象从适合 ObjectDataSource 对象绑定到对象的列表中排除的类。

该 IsDataObject 属性设置为参数的值 isDataObject 。