webform1.aspx.cs

C#2005 实例源代码

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class WebForm1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
            InitData();
    }

    protected void InitData()
    {
        //连接数据库
        SqlConnection myCon = new SqlConnection();
        myCon.ConnectionString = "Persist Security Info=False;User id=sa;pwd=sa;database=northwind;server=(local)";
        myCon.Open();

        //使用SqlCommand提交查询命令
        SqlCommand selectCMD = new SqlCommand("SELECT * FROM Categories", myCon);

        //获取数据适配器
        SqlDataAdapter da = new SqlDataAdapter();
        da.SelectCommand = selectCMD;

        //填充DataSet
        DataSet ds = new DataSet();
        da.Fill(ds);

        //将DataSet中的数据绑定到DropDownList1
        DataList1.DataSource = ds;
        DataList1.DataBind();

        //断开连接
        myCon.Close();
    }

    protected void DataList1_CancelCommand(object source, System.Web.UI.WebControls.DataListCommandEventArgs e)
    {
        DataList1.SelectedIndex = -1;
        DataList1.EditItemIndex = -1;
        InitData();
    }

    protected void DataList1_DeleteCommand(object source, System.Web.UI.WebControls.DataListCommandEventArgs e)
    {

    }

    protected void DataList1_EditCommand(object source, System.Web.UI.WebControls.DataListCommandEventArgs e)
    {
        DataList1.EditItemIndex = e.Item.ItemIndex;
        InitData();
    }

    protected void DataList1_ItemCommand(object source, System.Web.UI.WebControls.DataListCommandEventArgs e)
    {
        switch (e.CommandName)
        {
            case "cancel":
                DataList1.EditItemIndex = -1;
                break;
            case "back":
                DataList1.SelectedIndex = -1;
                break;
            case "delete":
                break;
            default:
                break;
        }
    }

    protected void DataList1_UpdateCommand(object source, System.Web.UI.WebControls.DataListCommandEventArgs e)
    {
        //构造Update语句
        string sql = "";
        string ID = ((Label)e.Item.FindControl("LabelCategoryID_e")).Text.ToString();
        string Name = ((TextBox)e.Item.FindControl("TextBoxCategoryName_e")).Text.ToString();
        string Description = ((TextBox)e.Item.FindControl("TextBoxDescription_e")).Text.ToString();

        sql = "Update Categories Set CategoryName = '" + Name
            + "', Description = '" + Description
            + "' Where CategoryID=" + ID;
        //数据库操作
        this.ExecuteSql(sql);
    }

    /// <summary>
    /// 执行增删改操作
    /// </summary>
    /// <param name="sql">待操作的SQL语句</param>
    protected void ExecuteSql(string sql)
    {
        //连接数据库
        SqlConnection myCon = new SqlConnection();
        myCon.ConnectionString = "Persist Security Info=False;User id=sa;pwd=sa;database=northwind;server=(local)";
        myCon.Open();

        //使用SqlCommand
        SqlCommand selectCMD = new SqlCommand();
        selectCMD.Connection = myCon;
        selectCMD.CommandText = sql;
        selectCMD.ExecuteNonQuery();

        //断开连接
        myCon.Close();
    }
}