利用DataTable进行删除GridView中的数据方法之新思路

public partial class DataSet_Delete : System.Web.UI.Page

{

    private string strConn = "data source=localhost;initial catalog=Northwind;user id=sa;password=sa";

    SqlConnection Conn;

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            //调用LoadGridView方法以填充和显示数据

            LoadGridView();

        }

    }

    private void ConnectionDB()

    {

        if (Conn == null)

        {

            //如果SqlConnection对象不存在新建该对象

            Conn = new SqlConnection(strConn);
        }

        if (Conn.State == ConnectionState.Closed)

        {

            //如果Connection对象的State状态为关闭Closed就将其打开

            Conn.Open();
        }

    }
    //创建CloseConnection方法，实现关闭数据库的操作

    private void CloseConnection()

    {

        Conn.Close();

    }

    //创建LoadGridView方法，实现填充GridView控件以显示数据

    private void LoadGridView()

    {

        string SelectSql = "SELECT * FROM Categories";

        ConnectionDB();

        SqlDataAdapter myDataAdapter = new SqlDataAdapter(SelectSql, Conn);

        DataSet myDataSet = new DataSet();

        myDataAdapter.Fill(myDataSet, "Categories");

        CloseConnection();

        GVCategory.DataSource = myDataSet.Tables["Categories"];

        GVCategory.DataBind();

    }

    protected void RowDelete(object sender, GridViewDeleteEventArgs e)

    {

        int CategroyID = Convert.ToInt32(GVCategory.Rows[e.RowIndex].Cells[0].Text);

        GVCategory.EditIndex = -1;

        ConnectionDB();

        string SelectSql = "SELECT * FROM Categories";

        SqlDataAdapter myDA = new SqlDataAdapter(SelectSql, Conn);

        DataSet DS = new DataSet();

        myDA.Fill(DS, "Categories");
        CloseConnection();

        //创建本地数据表table

        DataTable table = DS.Tables["Categories"];
        //设置table的PrimaryKey属性，其主键码设置为CategoryID列

        table.PrimaryKey = new DataColumn[] { table.Columns["CategoryID"] };
        //使用Find方法查找当前进行删除的数据行

        DataRow delRow = table.Rows.Find(CategroyID);
        //使用Delete方法删除数据行

        delRow.Delete();
        //创建SqlCommandBuilder对象myCB，它将自动创建DELETE语句

        SqlCommandBuilder myCB = new SqlCommandBuilder(myDA);
        ConnectionDB();
        //使用DataAdapter对象的Update方法将删除数据行后的table表推入到数据库中

        myDA.Update(table);
        CloseConnection();

        //重新载入数据，显示删除数据后的数据表内容

        LoadGridView();

    }

}