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asp.net中gridview的查詢、分頁、編輯更新、刪除的實例代碼

編輯：ASP.NET基礎

1.A,運行效果圖

1.B,源代碼
/App_Data/sql-basic.sql
復制代碼代碼如下:
use master
go
if exists(select * from sysdatabases where name='db1')
begin
    drop database db1
end
go
create database db1
go
use db1
go
-- ================================
-- ylb:1,類別表
-- ================================
create table category
(
    categoryid int identity(1,1) primary key,    --編號【PK】
    categoryname varchar(20) not null            --名稱
)

insert into category(categoryname) values('飲料')
insert into category(categoryname) values('主食')
insert into category(categoryname) values('副食')
insert into category(categoryname) values('蔬菜')

-- ================================
-- ylb:2,產品表
-- ================================
create table product
(
    productid int identity(1001,1) primary key,    --編號【PK】
    productname varchar(20),        --名稱
    unitprice numeric(7,2),            --單價
    special varchar(10) check(special in('特價','非特價')),    --是否特價【C】
    categoryid int foreign key references category(categoryid)    --類別編號【FK】
)

insert into product(productname,unitprice,special,categoryid) values('可樂1',12.6,'特價',1)
insert into product(productname,unitprice,special,categoryid) values('可樂2',12.6,'非特價',1)
insert into product(productname,unitprice,special,categoryid) values('可樂3',12.6,'非特價',1)
insert into product(productname,unitprice,special,categoryid) values('可樂4',12.6,'非特價',1)
insert into product(productname,unitprice,special,categoryid) values('可樂5',12.6,'特價',1)
insert into product(productname,unitprice,special,categoryid) values('可樂6',12.6,'特價',1)
insert into product(productname,unitprice,special,categoryid) values('可樂7',12.6,'特價',1)
insert into product(productname,unitprice,special,categoryid) values('可樂8',12.6,'特價',1)
insert into product(productname,unitprice,special,categoryid) values('饅頭1',12.6,'特價',2)
insert into product(productname,unitprice,special,categoryid) values('豆腐1',12.6,'特價',3)
insert into product(productname,unitprice,special,categoryid) values('冬瓜1',12.6,'特價',4)

select * from category
select productid,productname,unitprice,special,categoryid from product

,2
/App_Code/
/App_Code/DBConnection.cs

復制代碼代碼如下:
using System.Data.SqlClient;
/// <summary>
///DBConnection 的摘要說明
///數據連接類
/// </summary>
public class DBConnection
{
SqlConnection con = null;

    public DBConnection()
    {
        //創建連接對象
        con = new SqlConnection("Server=.;Database=db1;Uid=sa;pwd=sa");
    }

    /// <summary>
    /// 數據連接對象
    /// </summary>
    public SqlConnection Con
    {
        get { return con; }
        set { con = value; }
    }
}

/App_Code/CategoryInfo.cs
/App_Code/CategoryOper.cs
/App_Code/ProductInfo.cs

復制代碼代碼如下:
using System;

/// <summary>
///ProductInfo 的摘要說明
///產品實體類
/// </summary>
public class ProductInfo
{
    //1,Attributes
    int productId;
    string productName;
    decimal unitprice;
    string special;
    int categoryId;

    public ProductInfo()
    {
        //
        //TODO: 在此處添加構造函數邏輯
        //
    }
    //3,

    /// <summary>
    /// 產品編號【PK】
    /// </summary>
    public int ProductId
    {
        get { return productId; }
        set { productId = value; }
    }
    /// <summary>
    /// 產品名稱
    /// </summary>
    public string ProductName
    {
        get { return productName; }
        set { productName = value; }
    }
    /// <summary>
    /// 單位價格
    /// </summary>
    public decimal Unitprice
    {
        get { return unitprice; }
        set { unitprice = value; }
    }
    /// <summary>
    /// 是否為特價【C】（特價、非特價）
    /// </summary>
    public string Special
    {
        get { return special; }
        set { special = value; }
    }
    /// <summary>
    /// 類編編號【FK】
    /// </summary>
    public int CategoryId
    {
        get { return categoryId; }
        set { categoryId = value; }
    }
}

/App_Code/ProductOper.cs

復制代碼代碼如下:
using System;
using System.Collections.Generic;

using System.Data.SqlClient;
/// <summary>
///ProductOper 的摘要說明
/// </summary>
public class ProductOper
{
    /// <summary>
    /// 1,GetAll
    /// </summary>
    /// <returns></returns>
    public static IList<ProductInfo> GetAll()
    {
        IList<ProductInfo> dals = new List<ProductInfo>();
        string sql = "select productId,productName,unitprice,special,categoryId from Product order by productId desc";

        //1，創建連接對象
        SqlConnection con = new DBConnection().Con;
        //2，創建命令對象
        SqlCommand cmd = con.CreateCommand();

//3，把sql語句付給命令對象
cmd.CommandText = sql;

        //4，打開數據連接
        con.Open();
        try
        {
            using (SqlDataReader sdr = cmd.ExecuteReader())
            {
                while (sdr.Read())
                {
                    ProductInfo dal = new ProductInfo()
                    {
                        ProductId = sdr.GetInt32(0),
                        ProductName = sdr.GetString(1),
                        Unitprice = sdr.GetDecimal(2),
                        Special = sdr.GetString(3),
                        CategoryId = sdr.GetInt32(4)
                    };

                    dals.Add(dal);
                }
            }
        }
        finally
        {
            //，關閉數據連接（釋放資源）
            con.Close();
        }
        return dals;
    }

    public static void Add(ProductInfo dal)
    {
        string sql = "insert into Product(productName,unitprice,special,categoryId) values(@productName,@unitprice,@special,@categoryId)";

SqlConnection con = new DBConnection().Con;
SqlCommand cmd = con.CreateCommand();

        con.Open();
        try
        {
            cmd.ExecuteNonQuery();
        }
        finally {
            con.Close();
        }

    }
    public static void Update(ProductInfo dal)
    {
        string sql = "update Product set productName=@productName,unitprice=@unitprice,special=@special,categoryId=@categoryId where productId=@productId";

SqlConnection con = new DBConnection().Con;
SqlCommand cmd = con.CreateCommand();

        cmd.CommandText = sql;
        //配參數
        cmd.Parameters.Add(new SqlParameter("@productName", dal.ProductName));
        cmd.Parameters.Add(new SqlParameter("@unitprice", dal.Unitprice));
        cmd.Parameters.Add(new SqlParameter("@special", dal.Special));
        cmd.Parameters.Add(new SqlParameter("@categoryId", dal.CategoryId));
        cmd.Parameters.Add(new SqlParameter("@productId", dal.ProductId));
        con.Open();
        try
        {
            cmd.ExecuteNonQuery();
        }
        finally
        {
            con.Close();
        }

    }
    public static void Delete(int productId)
    {
        string sql = "delete Product where productId=@productId";

SqlConnection con = new DBConnection().Con;
SqlCommand cmd = con.CreateCommand();

        cmd.CommandText = sql;
        //配參數
        cmd.Parameters.Add(new SqlParameter("@productId", productId));
        con.Open();
        try
        {
            cmd.ExecuteNonQuery();
        }
        finally
        {
            con.Close();
        }

    }
    public ProductOper()
    {
        //
        //TODO: 在此處添加構造函數邏輯
        //
    }
}

,8
/Default.aspx

復制代碼代碼如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

/Default.aspx.cs

復制代碼代碼如下:
using System;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    /// <summary>
    /// 1,展示產品
    /// </summary>
    private void Bind()
    {
        gvwProduct.DataSource = ProductOper.GetAll();
        gvwProduct.DataBind();
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Bind();
        }
    }
    protected void gvwProduct_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        //刪除一行數據
        Label productIdLabel = (Label)gvwProduct.Rows[e.RowIndex].FindControl("Label1");
        int productId = Convert.ToInt32(productIdLabel.Text);

//調用刪除方法
ProductOper.Delete(productId);

        //更新數據
        Bind();
    }
    protected void gvwProduct_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            //給單元格，添加單擊事件
            e.Row.Cells[6].Attributes.Add("onclick", "return confirm('您確定要刪除該行數據！')");
        }
    }
    protected void gvwProduct_RowEditing(object sender, GridViewEditEventArgs e)
    {

Label specialLabel = (Label)gvwProduct.Rows[e.NewEditIndex].FindControl("Label4");
Label categoryIdLabel = (Label)gvwProduct.Rows[e.NewEditIndex].FindControl("Label5");

//進入編輯模式
gvwProduct.EditIndex = e.NewEditIndex; //（普通模式<-）分水嶺（->編輯模式）

//更新數據
Bind();

        RadioButtonList specialRadioButtonList = (RadioButtonList)gvwProduct.Rows[e.NewEditIndex].FindControl("RadioButtonList1");
        DropDownList categoryIdDropDownList = (DropDownList)gvwProduct.Rows[e.NewEditIndex].FindControl("DropDownList1");
        specialRadioButtonList.SelectedValue = specialLabel.Text;
        categoryIdDropDownList.DataSource = CategoryOper.GetAll();
        categoryIdDropDownList.DataTextField = "categoryName";
        categoryIdDropDownList.DataValueField = "categoryId";
        categoryIdDropDownList.DataBind();
        categoryIdDropDownList.SelectedValue = categoryIdLabel.Text;

    }
    protected void gvwProduct_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        //取消編輯模式
        gvwProduct.EditIndex = -1;

        //更新數據
        Bind();
    }
    protected void gvwProduct_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        //更新數據

        //1，准備條件
        Label productIdLabel = (Label)gvwProduct.Rows[e.RowIndex].FindControl("Label6");
        TextBox productNameTextBox = (TextBox)gvwProduct.Rows[e.RowIndex].FindControl("TextBox2");
        TextBox unitpriceTextBox = (TextBox)gvwProduct.Rows[e.RowIndex].FindControl("TextBox3");
        RadioButtonList specialRadioButtonList = (RadioButtonList)gvwProduct.Rows[e.RowIndex].FindControl("RadioButtonList1");
        DropDownList categoryIdDropDownList = (DropDownList)gvwProduct.Rows[e.RowIndex].FindControl("DropDownList1");

        ProductInfo dal = new ProductInfo() {
         ProductId=Convert.ToInt32(productIdLabel.Text),
          ProductName=productNameTextBox.Text,
           Unitprice=Convert.ToDecimal(unitpriceTextBox.Text),
            Special=specialRadioButtonList.SelectedValue,
             CategoryId=Convert.ToInt32(categoryIdDropDownList.SelectedValue)
        };
        //2,調用方法
        ProductOper.Update(dal);

//取消編輯模式
gvwProduct.EditIndex = -1;

//更新數據
Bind();

    }
    protected void gvwProduct_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        gvwProduct.PageIndex = e.NewPageIndex;

        //更新數據
        Bind();
    }
}

/Create.aspx

復制代碼代碼如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Create.aspx.cs" Inherits="Create" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

/Create.aspx.cs

復制代碼代碼如下:
using System;

public partial class Create : System.Web.UI.Page
{
    /// <summary>
    /// 1,類別列表
    /// </summary>
    private void Bind()
    {
        dropCategory.DataSource = CategoryOper.GetAll();
        dropCategory.DataTextField = "categoryName";
        dropCategory.DataValueField = "categoryId";
        dropCategory.DataBind();
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Bind();
        }
    }
    protected void btnAdd_Click(object sender, EventArgs e)
    {
        ProductInfo dal = new ProductInfo() {
         ProductName=txtProductName.Text.Trim(),
          Unitprice=Convert.ToDecimal(txtUnitprice.Text.Trim()),
           Special=rblSpecial.SelectedValue,
            CategoryId=Convert.ToInt32(dropCategory.SelectedValue)
        };