GridView控件实现增删改查

第一步：建立三层，并添加他们之间的引用关系，如下图所示：

第二步：添加GridView表格，并且套用格式样式，如下图所示：

第三步：点击表格右侧的小三角，并选中编辑列，如下图所示：

第四步：添加三个绑定列，并为其绑定上数据，如下图所示：

并且修改命令列的名称为“管理”，做好之后如下图所示：

下面是源代码的整体架构

接下来是所有的源代码：

DiaryModels层的Users


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace DiaryModels
{/// <summary>/// 用户类/// </summary>public class Users{private int _UserID;private string _UserName;private string _password;/// <summary>/// 用户ID/// </summary>public int UserID {get { return _UserID; }set { _UserID = value; }}/// <summary>/// 用户名/// </summary>public string UserName {get { return _UserName; }set { _UserName = value; }}/// <summary>/// 密码/// </summary>public string password {get { return _password; }set { _password = value; }}}
}

DiaryDAL层的UserDAO

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;
using DiaryModels;
using System.Data;
using System.Data.SqlClient;namespace DiaryDAL
{public class UserDAO{Helper help = new Helper();/// <summary>/// 添加一条用户信息/// </summary>/// <param name="user"></param>/// <returns></returns>public bool Add(Users user) {string cmdText = "insert into Users(UserID,UserName,password) values(@UserID,@UserName,@password)";SqlParameter[] param = new SqlParameter[3];param[0]=new SqlParameter("@UserID",user.UserID);param[1] = new SqlParameter("@UserName", user.UserName);param[2] = new SqlParameter("@password", user.password);return help.ExecMake(cmdText, CommandType.Text, param);}/// <summary>/// 删除一条用户信息/// </summary>/// <param name="user"></param>/// <returns></returns>public bool Delete(Users user) {string cmdText = "delete from Users where UserID=@UserID";SqlParameter[] param = new SqlParameter[1];param[0] = new SqlParameter("@UserID", user.UserID);return help.ExecMake(cmdText, CommandType.Text, param);}/// <summary>/// 修改一条用户信息/// </summary>/// <param name="user"></param>/// <returns></returns>public bool Modify(Users user) {string cmdText = "update Users set UserName =@UserName,password =@password where UserID =@UserID";SqlParameter[] param = new SqlParameter[3];param[0] = new SqlParameter("@UserName", user.UserName);param[1] = new SqlParameter("@password", user.password);param[2] = new SqlParameter("@UserID", user.UserID);return help.ExecMake(cmdText, CommandType.Text, param);}public DataTable Select() {string cmdText = "select * from Users";return help.ExecSelect(cmdText, CommandType.Text);}}
}

DiaryDAL层的Helper类


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;namespace DiaryDAL
{public class Helper{/// <summary>/// 执行带参数的增删改语句/// </summary>/// <param name="cmdText"></param>/// <param name="Paras"></param>/// <returns></returns>public bool ExecMake(string cmdText, CommandType Cmdtype, SqlParameter[] Paras){SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["conStr"]);con.Open();//对SqlCommand对象进行初始化SqlCommand SqlComm = new SqlCommand(cmdText, con);SqlComm.CommandType = Cmdtype;//对参数赋值SqlComm.Parameters.AddRange(Paras);//执行命令SqlComm.ExecuteNonQuery();con.Close();return true;}/// <summary>/// 执行不带参数的查询语句/// </summary>/// <param name="cmdText"></param>/// <param name="Paras"></param>/// <returns></returns>public DataTable ExecSelect(string cmdText, CommandType Cmdtype){SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["conStr"]);con.Open();//对SqlCommand对象进行实例化SqlCommand SqlComm = new SqlCommand(cmdText, con);SqlComm.CommandType = Cmdtype;//给参数赋值SqlComm.CommandTimeout = 10000;//返回DataReader对象SqlDataReader DataReader = SqlComm.ExecuteReader();DataTable Dt = new DataTable();//返回DataTable对象Dt.Load(DataReader);//返回数据表con.Close();return Dt;}}
}

业务逻辑层DiaryBLL的UserManager没有进行判断，读者明白意思即可

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using DiaryModels;
using DiaryDAL;namespace DiaryBLL
{public class UserManager{UserDAO userdao = new UserDAO();public bool Add(Users user) {return userdao.Add(user);}public bool Delete(Users user) {return userdao.Delete(user);}public bool Modify(Users user) {return userdao.Modify(user);}public DataTable Select() {return userdao.Select();}}
}

表示层：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using DiaryModels;
using DiaryBLL;public partial class _Default : System.Web.UI.Page
{UserManager usermgr = new UserManager();Users user = new Users();//为表格绑定数据源private void Bind() {GridView1.DataSource = usermgr.Select();GridView1.DataBind();}protected void Page_Load(object sender, EventArgs e){if (!IsPostBack) {Bind();}}//添加用户信息protected void btnOk_Click(object sender, EventArgs e){user.UserID = Convert.ToInt16( txtUserID.Text);user.UserName = txtUserName.Text;user.password = txtPassword.Text;if (usermgr.Add(user)){Response.Write("<script>('添加成功！')</script>");Bind();}else {Response.Write("<script>('添加失败！')</script>");}}protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e){user.UserID = Convert.ToInt16(((GridView1.Rows[e.RowIndex].FindControl("Label1") as Label).Text));if (usermgr.Delete(user)){Response.Write("<script>('删除成功！')</script>");Bind();}else {Response.Write("<script>('删除失败！')</script>");}}
//让当前行处于修改状态protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e){GridView1.EditIndex = e.NewEditIndex;Bind();}//取消编辑protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e){GridView1.EditIndex = -1;Bind();}//更新至数据库protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e){user.UserID = Convert.ToInt16((GridView1.Rows[e.RowIndex].FindControl("Label1")as Label).Text);user.UserName = (GridView1.Rows[e.RowIndex].FindControl("TextBox2") as TextBox).Text;user.password = (GridView1.Rows[e.RowIndex].FindControl("TextBox3") as TextBox).Text;if (usermgr.Modify(user)){Response.Write("<script>('修改成功！')</script>");GridView1.EditIndex = -1;Bind();}else {Response.Write("<script>('修改失败！')</script>");}}
}

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