SqlCeDataAdapter.RowUpdating 事件

在针对数据源执行更新命令之前在调用 Update 期间发生。试图进行更新，于是激发了此事件。

命名空间: System.Data.SqlServerCe
程序集: System.Data.SqlServerCe（在 system.data.sqlserverce.dll 中）

语法

声明
Public Event RowUpdating As SqlCeRowUpdatingEventHandler
用法
Dim instance As SqlCeDataAdapter
Dim handler As SqlCeRowUpdatingEventHandler

AddHandler instance.RowUpdating, handler

public event SqlCeRowUpdatingEventHandler RowUpdating

public:
event SqlCeRowUpdatingEventHandler^ RowUpdating {
    void add (SqlCeRowUpdatingEventHandler^ value);
    void remove (SqlCeRowUpdatingEventHandler^ value);
}

/** @event */
public void add_RowUpdating (SqlCeRowUpdatingEventHandler value)

/** @event */
public void remove_RowUpdating (SqlCeRowUpdatingEventHandler value)

在 JScript 中，可处理由类定义的事件，但无法定义自己的事件。

不适用。

备注

当使用 Update 时，每个更新的数据行都发生两个事件。执行顺序如下：

1. 将 DataRow 中的值移至参数值。

2. 引发 OnRowUpdating 事件。

3. 执行命令。

4. 如果该命令设置为 FirstReturnedRecord，返回的第一项结果将放置在 DataRow 中。

5. 引发 OnRowUpdated 事件。

6. 调用 AcceptChanges。

示例

下面的示例阐释了 RowUpdating 和 RowUpdated 事件的使用。

Public Sub Snippet5()
    ' Create DataAdapter
    '
    Dim adp As New SqlCeDataAdapter("SELECT * FROM products", "Data Source = MyDatabase.sdf")

    Dim cb As New SqlCeCommandBuilder(adp)

    ' Create and fill the dataset (select only first 5 rows)
    '
    Dim ds As New DataSet()
    adp.Fill(ds, 0, 5, "Table")

    ' Modify dataSet
    '
    Dim table As DataTable = ds.Tables("Table")
    table.Rows(1)("Product Name") = "Asian Chai"

    ' Add handlers
    '
    AddHandler adp.RowUpdating, AddressOf OnRowUpdating
    AddHandler adp.RowUpdated, AddressOf OnRowUpdated

    ' Update, this operation fires two events (RowUpdating/RowUpdated)  
    '
    adp.Update(ds, "Table")

    ' Remove handlers
    '
    RemoveHandler adp.RowUpdating, AddressOf OnRowUpdating
    RemoveHandler adp.RowUpdated, AddressOf OnRowUpdated

End Sub 'Snippet5


Private Shared Sub OnRowUpdating(ByVal sender As Object, ByVal e As SqlCeRowUpdatingEventArgs)
    Console.WriteLine("OnRowUpdating")
    Console.WriteLine(e.Command.CommandText)
    Console.WriteLine(e.StatementType)
    Console.WriteLine(e.Status)

End Sub 'OnRowUpdating


Private Shared Sub OnRowUpdated(ByVal sender As Object, ByVal e As SqlCeRowUpdatedEventArgs)
    Console.WriteLine("OnRowUpdated")
    Console.WriteLine(e.Command.CommandText)
    Console.WriteLine(e.StatementType)
    Console.WriteLine(e.Status)

End Sub 'OnRowUpdated

public void Snippet5()
{
    // Create DataAdapter
    //
    SqlCeDataAdapter adp = new SqlCeDataAdapter(
        "SELECT * FROM products",
        "Data Source = MyDatabase.sdf");

    SqlCeCommandBuilder cb = new SqlCeCommandBuilder(adp);

    // Create and fill the dataset (select only first 5 rows)
    //
    DataSet ds = new DataSet();
    adp.Fill(ds, 0, 5, "Table");

    // Modify dataSet
    //
    DataTable table = ds.Tables["Table"];
    table.Rows[1]["Product Name"] = "Asian Chai";

    // Add handlers
    //
    adp.RowUpdating += new SqlCeRowUpdatingEventHandler(OnRowUpdating);
    adp.RowUpdated += new SqlCeRowUpdatedEventHandler(OnRowUpdated);

    // Update, this operation fires two events (RowUpdating/RowUpdated)  
    //
    adp.Update(ds, "Table");

    // Remove handlers
    //
    adp.RowUpdating -= new SqlCeRowUpdatingEventHandler(OnRowUpdating);
    adp.RowUpdated -= new SqlCeRowUpdatedEventHandler(OnRowUpdated);
}

private static void OnRowUpdating(object sender, SqlCeRowUpdatingEventArgs e)
{
    Console.WriteLine("OnRowUpdating");
    Console.WriteLine(e.Command.CommandText);
    Console.WriteLine(e.StatementType);
    Console.WriteLine(e.Status);
}

private static void OnRowUpdated(object sender, SqlCeRowUpdatedEventArgs e)
{
    Console.WriteLine("OnRowUpdated");
    Console.WriteLine(e.Command.CommandText);
    Console.WriteLine(e.StatementType);
    Console.WriteLine(e.Status);
}

平台

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

Windows Vista、Microsoft Windows XP SP2 和 Windows Server 2003 SP1 支持 Microsoft .NET Framework 3.0。

版本信息

.NET Framework

受以下版本支持：3.0

.NET Compact Framework

受以下版本支持：2.0、1.0

请参见

参考

SqlCeDataAdapter 类
SqlCeDataAdapter 成员
System.Data.SqlServerCe 命名空间