SqlDataAdapter.RowUpdating 事件

定義

發生在已經針對資料來源執行命令前的 Update(DataSet) 期間。 嘗試進行更新,因此引發了事件。

public:
 event Microsoft::Data::SqlClient::SqlRowUpdatingEventHandler ^ RowUpdating;
public event Microsoft.Data.SqlClient.SqlRowUpdatingEventHandler RowUpdating;
member this.RowUpdating : Microsoft.Data.SqlClient.SqlRowUpdatingEventHandler 
Public Custom Event RowUpdating As SqlRowUpdatingEventHandler 

事件類型

範例

下列範例示範如何使用 RowUpdatingRowUpdated 事件。

事件會 RowUpdating 傳回此輸出:

事件引數: (command=Microsoft.Data.SqlClient.SqlCommand commandType=2 status=0)

事件會 RowUpdated 傳回此輸出:

事件引數: (command=Microsoft.Data.SqlClient.SqlCommand commandType=2 recordsAffected=1 row=System.Data.DataRow[37] status=0)

using Microsoft.Data.SqlClient;
using System.Xml;
using System.Data.Common;
using System.Windows.Forms;

public class Form1 : Form
{
    private DataSet DataSet1;
    private DataGrid dataGrid1;

    // 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 + ")");
    }
}

備註

使用 Update 時,每個資料列都會更新兩個事件。 執行順序如下:

  1. 中的 DataRow 值會移至參數值。

  2. 便會引發 OnRowUpdating 事件。

  3. 命令會執行。

  4. 如果命令設定為 FirstReturnedRecord ,則會將 DataRow 第一個傳回的結果放在 中。

  5. 如果有輸出參數,它們會放在 中 DataRow

  6. 便會引發 OnRowUpdated 事件。

  7. 呼叫 AcceptChanges

適用於