SqlDataAdapter.RowUpdating 事件
在对数据源执行命令前的 Update 过程中发生。试图进行更新，因此激发了该事件。
**命名空间:**System.Data.SqlClient
**程序集:**System.Data（在 system.data.dll 中）
语法
声明
Public Event RowUpdating As SqlRowUpdatingEventHandler
用法
Dim instance As SqlDataAdapter
Dim handler As SqlRowUpdatingEventHandler
AddHandler instance.RowUpdating, handler
public event SqlRowUpdatingEventHandler RowUpdating
public:
event SqlRowUpdatingEventHandler^ RowUpdating {
void add (SqlRowUpdatingEventHandler^ value);
void remove (SqlRowUpdatingEventHandler^ value);
}
/** @event */
public void add_RowUpdating (SqlRowUpdatingEventHandler value)
/** @event */
public void remove_RowUpdating (SqlRowUpdatingEventHandler value)
JScript 支持使用事件，但不支持进行新的声明。
备注
当使用 Update 时，每一个更新的数据行都会发生两个事件。执行顺序如下：
将 DataRow 中的值移至参数值。
引发 OnRowUpdating 事件。
执行命令。
如果该命令设置为 FirstReturnedRecord，返回的第一项结果将放置在 DataRow 中。
如果存在输出参数，它们将被放在 DataRow 中。
引发 OnRowUpdated 事件。
调用 AcceptChanges。
示例
下面的示例显示如何使用 RowUpdating 和 RowUpdated 事件。
RowUpdating 事件返回下面的输出：
event args: (command=System.Data.SqlClient.SqlCommand commandType=2 status=0)
RowUpdated 事件返回下面的输出：
event args: (command=System.Data.SqlClient.SqlCommand commandType=2 recordsAffected=1 row=System.Data.DataRow[37] status=0)
' handler for RowUpdating event
Private Shared Sub OnRowUpdating(sender As Object, e As SqlRowUpdatingEventArgs)
PrintEventArgs(e)
End Sub
' handler for RowUpdated event
Private Shared Sub OnRowUpdated(sender As Object, e As SqlRowUpdatedEventArgs)
PrintEventArgs(e)
End Sub
'Entry point which delegates to C-style main Private Function
Public Overloads Shared Sub Main()
System.Environment.ExitCode = Main(System.Environment.GetCommandLineArgs())
End Sub
Overloads Public Shared Function Main(args() As String) As Integer
Const connectionString As String = _
"Integrated Security=SSPI;database=Northwind;server=MSSQL1"
Const queryString As String = "SELECT * FROMProducts"
' create DataAdapter
Dim adapter As New SqlDataAdapter(queryString, connectionString)
Dim builder As SqlCommandBuilder = New SqlCommandBuilder(adapter)
' Create and fill DataSet (select only first 5 rows)
Dim dataSet As New DataSet()
adapter.Fill(dataSet, 0, 5, "Table")
' Modify DataSet
Dim table As DataTable = dataSet.Tables("Table")
table.Rows(0)(1) = "new product"
' add handlers
AddHandler adapter.RowUpdating, AddressOf OnRowUpdating
AddHandler adapter.RowUpdated, AddressOf OnRowUpdated
' update, this operation fires two events
'(RowUpdating/RowUpdated) per changed row
adapter.Update(dataSet, "Table")
' remove handlers
RemoveHandler adapter.RowUpdating, AddressOf OnRowUpdating
RemoveHandler adapter.RowUpdated, AddressOf OnRowUpdated
Return 0
End Function
Overloads Private Shared Sub PrintEventArgs(args As SqlRowUpdatingEventArgs)
Console.WriteLine("OnRowUpdating")
Console.WriteLine(" event args: (" & " command=" & args.Command.CommandText & _
" commandType=" & args.StatementType & " status=" & args.Status & ")")
End Sub
Overloads Private Shared Sub PrintEventArgs(args As SqlRowUpdatedEventArgs)
Console.WriteLine("OnRowUpdated")
Console.WriteLine(" event args: (" & " command=" & args.Command.CommandText & _
" commandType=" & args.StatementType & " recordsAffected=" & _
args.RecordsAffected & " status=" & args.Status & ")")
End Sub
End Class
// handler for RowUpdating event
private static void OnRowUpdating(object sender, SqlRowUpdatingEventArgs e)
{
PrintEventArgs(e);
}
// handler for RowUpdated event
private static void OnRowUpdated(object sender, SqlRowUpdatedEventArgs e)
{
PrintEventArgs(e);
}
public static int Main()
{
const string connectionString =
"Integrated Security=SSPI;database=Northwind;server=MSSQL1";
const string queryString = "SELECT * FROMProducts";
// create DataAdapter
SqlDataAdapter adapter = new SqlDataAdapter(queryString, connectionString);
SqlCommandBuilder builder = new SqlCommandBuilder(adapter);
// Create and fill DataSet (select only first 5 rows)
DataSet dataSet = new DataSet();
adapter.Fill(dataSet, 0, 5, "Table");
// Modify DataSet
DataTable table = dataSet.Tables["Table"];
table.Rows[0][1] = "new product";
// add handlers
adapter.RowUpdating += new SqlRowUpdatingEventHandler( OnRowUpdating );
adapter.RowUpdated += new SqlRowUpdatedEventHandler( OnRowUpdated );
// update, this operation fires two events
// (RowUpdating/RowUpdated) per changed row
adapter.Update(dataSet, "Table");
// remove handlers
adapter.RowUpdating -= new SqlRowUpdatingEventHandler( OnRowUpdating );
adapter.RowUpdated -= new SqlRowUpdatedEventHandler( OnRowUpdated );
return 0;
}
private static void PrintEventArgs(SqlRowUpdatingEventArgs args)
{
Console.WriteLine("OnRowUpdating");
Console.WriteLine(" event args: ("+
" command=" + args.Command +
" commandType=" + args.StatementType +
" status=" + args.Status + ")");
}
private static void PrintEventArgs(SqlRowUpdatedEventArgs args)
{
Console.WriteLine("OnRowUpdated");
Console.WriteLine( " event args: ("+
" command=" + args.Command +
" commandType=" + args.StatementType +
" recordsAffected=" + args.RecordsAffected +
" status=" + args.Status + ")");
}
平台
Windows 98、Windows 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
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
.NET Compact Framework
受以下版本支持：2.0、1.0
请参见
参考
SqlDataAdapter 类
SqlDataAdapter 成员
System.Data.SqlClient 命名空间