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C#结合数据库开发通讯录管理系统

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通讯录管理系统，数据库关系模式为:账户(账户名,登录密码,头像)，联系人(ID,姓名,电话,QQ,Email)。主要功能包括：注册，登录，注销账号，修改账户名以及密码，更换头像，以及对联系人的增删改查。工具：VisualStudio2015,sqlserver2014数据库关系表：Account:…

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     通讯录管理系统，数据库关系模式为:账户(账户名,登录密码,头像)，联系人(ID,姓名,电话,QQ,Email)。主要功能包括：注册，登录，注销账号，修改账户名以及密码，更换头像，以及对联系人的增删改查。

工具：Visual Studio 2015,sql server2014

数据库关系表：

Account:                                                                           Contact:

 

C#结合数据库开发通讯录管理系统

                   

VS中主要界面及代码：

登录主界面：Login

C#结合数据库开发通讯录管理系统

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace Contact_Manage
{
    /// <summary>
    /// 登录
    /// </summary>
    public partial class Login : Form
    {
        //存取用户登录名
        public static String txtLogin_Username;
        public Login()
        {
            InitializeComponent();
        }

        //登录
        private void btt_Login_Click(object sender, EventArgs e)
        {
            //获取用户输入的用户名和密码
            txtLogin_Username = tB_Account_Username.Text;
            String password = tB_Account_Password.Text;

            if (txtLogin_Username == "" || password == "")
            {
                MessageBox.Show("请输入用户名和密码！");
                return;
            }

            //连接数据库进行数据判断
            string sqlcon = "server=.;database=phone_Book;uid=sa;pwd=666888";
            String sqlcom = " select * from Account where Account_Username='" + txtLogin_Username + "' and Account_password='" + password + "'";
            SqlConnection con = new SqlConnection(sqlcon);
            SqlCommand com = new SqlCommand(sqlcom, con);
            con.Open();

            SqlDataReader reader = com.ExecuteReader();
            if (reader.Read())
            {
                //打开菜单页面
                Menu menu = new Menu();
                menu.Show();
            }
            else
            {
                MessageBox.Show("用户名或密码错误，请重新输入！");
            }
            con.Close();

            //清空文本框
            foreach (Control item in this.Controls)
            {
                if (item is TextBox)
                {
                    item.Text = "";
                }
            }
        }

        //注册账号事件
        private void lb_Regist_Click(object sender, EventArgs e)
        {
            Regist rigist = new Regist();
            rigist.Show();
        }

        //注销账户事件
        private void lb_Logout_Click(object sender, EventArgs e)
        {
            //跳出注销界面，验证输入的用户名及密码是否正确
            Logout logout = new Logout();
            logout.Show();

        }

        //点击密码文本框时将登录头像显示在pictureBox控件中
        private void tB_Account_Password_MouseClick(object sender, MouseEventArgs e)
        {
            //获取输入的用户名
            String username = tB_Account_Username.Text;

            if (username != "")
            {
                //连接数据库，如果该用户名存在则将头像显示
                string sqlcon = "server=.;database=phone_Book;uid=sa;pwd=666888";
                String sqlcom = " select * from Account where Account_Username='" + username + "'";
                SqlConnection con = new SqlConnection(sqlcon);
                SqlCommand com = new SqlCommand(sqlcom, con);
                con.Open();

                SqlDataReader reader = com.ExecuteReader();
                if (reader.Read())
                {
                    reader.Close();
                    //连接数据库，获取该用户名的头像保存路径

                    //连接数据库
                    string sqlcon2 = "server=.;database=phone_Book;uid=sa;pwd=666888";
                    String sqlcom2 = "select Account_Image from Account where Account_Username='" + username + "'";
                    SqlConnection con2 = new SqlConnection(sqlcon2);
                    SqlCommand com2 = new SqlCommand(sqlcom2, con2);
                    con2.Open();
                    //返回结果集的第一行第一列
                    object obj = com2.ExecuteScalar();
                    //将数据库中读取到的路径放入变量中
                    String image_Path = obj.ToString();

                    con2.Close();

                    pctrB_Image.Image = Image.FromFile(image_Path);
                    //将图片居中显示
                    pctrB_Image.SizeMode = PictureBoxSizeMode.StretchImage;

                }
                else
                {
                    MessageBox.Show("用户名不存在，请重新输入！");
                }
                con.Close();

            }


        }

    }
}

注册窗体（登录界面中点击注册事件时将跳转到此窗体）：Regist

    此处更换头像利用了openFileDialog控件打开系统文件会话框,选择图片之后显示在pictureBox控件中,数据库中存放了图片所在的路径，图片的路径可以利用openFileDialog对象.FileName.ToString()获得，点击注册按钮将所有注册信息加入数据库中。

C#结合数据库开发通讯录管理系统

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace Contact_Manage
{
    public partial class Regist : Form
    {
        //默认头像路径
        public static String imagePath = "F:/VS设计/Contact_Manage/images/1.jpeg";
        public Regist()
        {
            InitializeComponent();
        }

        private void btt_Regist_Click(object sender, EventArgs e)
        {
            //获取用户注册输入的用户名和密码
            String regist_Username = tB_Regist_Username.Text;
            String regist_Password1 = tB_Regist_Password1.Text;
            string regist_Password2 = tB_Regist_Password2.Text;

            //判断是否输入了用户名和密码
            if (regist_Username == "" || regist_Password1 == "" || regist_Password2 == "")
            {
                MessageBox.Show("请输入用户名和密码！");
                return;
            }
            
            //判断两次输入的密码是否一致
            if (!regist_Password1.Equals(regist_Password2))
            {
                MessageBox.Show("两次输入的密码不一致，请重新输入！");
                return;
            }
            

            //连接数据库，判断用户名是否已存在
            string sqlcon = "server=.;database=phone_Book;uid=sa;pwd=666888";
            String sqlcom = " select * from Account where Account_Username='" + regist_Username + "'";
            SqlConnection con = new SqlConnection(sqlcon);
            SqlCommand com = new SqlCommand(sqlcom, con);
            con.Open();

            SqlDataReader reader = com.ExecuteReader();
            if (reader.Read())
            {
                MessageBox.Show("用户名已存在，请重新输入用户名！");
                return;
            }
            reader.Close();
            


            //验证通过，将用户输入的数据添加进入数据库
            String sqlcom2 = " insert into Account(Account_Username,Account_Password,Account_Image) values('" + regist_Username + "','" + regist_Password1 + "','"+imagePath+"')";
            SqlCommand com2 = new SqlCommand(sqlcom2, con);
            int eq=com2.ExecuteNonQuery();
            if(eq!=0)
            {
                MessageBox.Show("注册成功！将跳转到登录页面！");
                this.Close();
            }
            con.Close();

        }

        //当点击用户名文本框时给pictureBox中放置一张默认的图片
        private void tB_Regist_Username_MouseClick(object sender, MouseEventArgs e)
        {
            //如果pictureBox为空时显示默认图片
            if (pctrB_Regist_Image.Image == null)
            {
                String imagePath = "F:/VS设计/Contact_Manage/images/1.jpeg";
                pctrB_Regist_Image.Image = Image.FromFile(imagePath);
                pctrB_Regist_Image.SizeMode = PictureBoxSizeMode.StretchImage;
            }
            
        }
        private void btt_ChangeImage_Click(object sender, EventArgs e)
        {

            //自定义OpenFileDialog打开Windows文件对话框选择文件，并保存路径
            OpenFileDialog f = new OpenFileDialog();
            f.InitialDirectory = Application.StartupPath + @"\images";
            f.Filter = "All files (*.*)|*.*|txt files (*.txt)|*.txt";
            f.FilterIndex = 1;
            f.RestoreDirectory = true;
            if (f.ShowDialog() == DialogResult.OK)
            {
                imagePath = f.FileName.ToString();
                //将更换的图片显示在注册页面
                pctrB_Regist_Image.Image = Image.FromFile(imagePath);
                //将图片居中显示
                pctrB_Regist_Image.SizeMode = PictureBoxSizeMode.StretchImage;
            }
            return;
        }
    }
}

注销账号(在登录界面的注销事件中实例化此窗体):Logout

C#结合数据库开发通讯录管理系统

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace Contact_Manage
{
    /// <summary>
    /// 注销用户界面
    /// </summary>
    public partial class Logout : Form
    {
        //注销账号名
        public static string txtLogoutName;
        public Logout()
        {
            InitializeComponent();
        }


        private void btt_Logout_Click(object sender, EventArgs e)
        {
            //获取用户输入的将要注销的用户名及密码
            String logout_Username = tB_Logout_Username.Text;
            String logout_Password = tB_Logout_Password.Text;

            //判断是否输入了用户名及密码
            if (logout_Username == "" || logout_Password == "")
            {
                MessageBox.Show("请输入要注销的用户名和密码！");
                return;
            }

            //连接数据库进行数据验证
            String sqlcon = "server=.;database=phone_Book;uid=sa;pwd=666888;";
            String sqlcom = "select * from Account where Account_Username='"+logout_Username+"' and Account_Password='"+logout_Password+"'";
            SqlConnection con = new SqlConnection(sqlcon);
            SqlCommand com = new SqlCommand(sqlcom,con);
            con.Open();
            SqlDataReader reader= com.ExecuteReader();
            if (reader.Read())
            {
                //如果密码以及用户名正确，提示用户是否确认注销，确定之后将该用户从数据库中删除
                txtLogoutName= tB_Logout_Username.Text;
                Affirm affirm = new Affirm();
                affirm.Show();
                
            }
            else { MessageBox.Show("你输入的用户名或密码不正确，请重新输入！"); }

            //清空所有文本框
            foreach (Control item in this.Controls)
            {
                if (item is TextBox)
                {
                    item.Text = "";
                }
            }
            
            con.Close();

        }
    }
}

菜单：Menu

C#结合数据库开发通讯录管理系统

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Contact_Manage
{
    public partial class Menu : Form
    {
        public Menu()
        {
            InitializeComponent();
        }

        private void btt_Add_Contact_Click(object sender, EventArgs e)
        {
            AddContact add = new AddContact();
            add.Show();
        }

        private void btt_Manage_Contact_Click(object sender, EventArgs e)
        {
            Contact_Manage query= new Contact_Manage();
            query.Show();
        }

        //修改密码
        private void btt_Modification_Password_Click(object sender, EventArgs e)
        {
            Modification_Password modif_Pwd = new Modification_Password();
            modif_Pwd.Show();
        }

        //更换头像
        private void btt_Change_Image_Click(object sender, EventArgs e)
        {
            Change_Image cImg = new Change_Image();
            cImg.Show();
        }

        //修改账户名
        private void btt_Mdfct_Username_Click(object sender, EventArgs e)
        {
            Mdfct_Acct_Username m = new Mdfct_Acct_Username();
            m.Show();
        }
    }
}

添加联系人：AddContact

C#结合数据库开发通讯录管理系统

 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace Contact_Manage
{
    /// <summary>
    /// 添加联系人
    /// </summary>
    public partial class AddContact : Form
    {
        public AddContact()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //判断是否有必填项目未输入的情况
            if (tB_Name.Text.Length == 0 && tB_Phone.Text.Length == 0)
            {
                MessageBox.Show("姓名电话必须填写！");
                return;
            }

            string sqlcon = "server=.;database=phone_Book;uid=sa;pwd=666888";
            string sqlcom = "INSERT INTO Contact (Contact_Name,Contact_QQ,Contact_Phone,Contact_Email,Account_Username) VALUES('"
                + tB_Name.Text + "','" + tB_QQ.Text + "','" + tB_Phone.Text + "','" + tB_Email.Text + "','"+Login.txtLogin_Username+"')";
            //执行添加操作
            SqlConnection con = new SqlConnection(sqlcon);
            SqlCommand com = new SqlCommand(sqlcom, con);
            con.Open();
            int eq = com.ExecuteNonQuery();
            if (eq != 0)
            {
                MessageBox.Show("添加成功!");
            }
            con.Close();


            //清空所有文本框
            foreach (Control item in this.Controls)
            {
                if (item is TextBox)
                {
                    item.Text = "";
                }
            }
        }
    }
}
 

修改密码：Modification_Password

C#结合数据库开发通讯录管理系统

 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace Contact_Manage
{
    //修改密码
    public partial class Modification_Password : Form
    {
        public Modification_Password()
        {
            InitializeComponent();
        }

        //修改密码事件
        private void btt_Modification_Password_Click(object sender, EventArgs e)
        {
            //获取当前登录用户的登录名
            String modification_Username = Login.txtLogin_Username;

            //获取用户输入的登录密码以及两次新密码
            String login_Pwd = tB_Modif_Password.Text;
            String modif_NewPwd1 = tB_Modif_NewPassword.Text;
            String modif_NewPwd2 = tB_Modif_NewPassword2.Text;

            //判断是否输入了原密码
            if (login_Pwd == "")
            {
                MessageBox.Show("请输入密码！");
                return;
            }

            //连接数据库验证原密码是否正确
            String sqlcon = "server=.;database=phone_Book;uid=sa;pwd=666888;";
            String sqlcom = "select * from Account where Account_Password='"+login_Pwd+"'";
            SqlConnection con = new SqlConnection(sqlcon);
            SqlCommand com = new SqlCommand(sqlcom,con);
            con.Open();
            SqlDataReader reader= com.ExecuteReader();
            if (!reader.Read())
            {
                MessageBox.Show("原登录密码错误，请重新输入！");
                return;
            }
            con.Close();

            //判断用户是否输入了新密码
            if (modif_NewPwd1 == "" || modif_NewPwd2 == "")
            {
                MessageBox.Show("请输入新密码！");
                return;
            }

            //判断两次输入的新密码是否一致
            if (!modif_NewPwd1.Equals(modif_NewPwd2))
            {
                MessageBox.Show("你两次输入的新密码不一致，请重新输入！");
                return;
            }

            //验证通过，进行修改密码操作
            String sqlcom2 = "update Account set Account_Password='"+modif_NewPwd1+"' where Account_Username='"+modification_Username+"'";
            SqlConnection con2 = new SqlConnection(sqlcon);
            SqlCommand com2 = new SqlCommand(sqlcom2, con2);
            con2.Open();
            int eq=com2.ExecuteNonQuery();
            if (eq != 0)
            {
                MessageBox.Show("修改密码成功思密达！");
                this.Close();
            }
            else MessageBox.Show("修改密码失败思密达！");

            con2.Close();
        }

        //当点击这个文本框时，将用户名显示
        private void tB_Modif_Password_MouseClick(object sender, MouseEventArgs e)
        {
            //获取当前登录用户的登录名
            String modification_Username = Login.txtLogin_Username;
            tB_Modif_Username.Text = modification_Username;
        }

        //当点击这个文本框时，也将用户名显示
        private void tB_Modif_Username_MouseClick(object sender, MouseEventArgs e)
        {
            //获取当前登录用户的登录名
            String modification_Username = Login.txtLogin_Username;
            tB_Modif_Username.Text = modification_Username;
        }
    }
}
 

更换头像：Change_Image

C#结合数据库开发通讯录管理系统

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace Contact_Manage
{
    public partial class Change_Image : Form
    {
        public Change_Image()
        {
            InitializeComponent();
        }

        private void btt_Select_Image_Click(object sender, EventArgs e)
        {
            //自定义OpenFileDialog打开Windows文件对话框选择文件，并保存路径
            OpenFileDialog f = new OpenFileDialog();
            f.InitialDirectory = Application.StartupPath + @"\images";
            f.Filter = "All files (*.*)|*.*|txt files (*.txt)|*.txt";
            f.FilterIndex = 1;
            f.RestoreDirectory = true;
            if (f.ShowDialog() == DialogResult.OK)
            {
                Regist.imagePath = f.FileName.ToString();
                //将更换的图片显示在注册页面
                pictrB_Image.Image = Image.FromFile(Regist.imagePath);
                //将图片居中显示
                pictrB_Image.SizeMode = PictureBoxSizeMode.StretchImage;
            }
            return;
        }

        private void btt_Change_Image_Click(object sender, EventArgs e)
        {
            if (pictrB_Image.Image != null)
            {
                string sqlcon = "server=.;database=phone_Book;uid=sa;pwd=666888";
                String sqlcom2 = "update Account set Account_Image='" + Regist.imagePath + "' where Account_Username='" + Login.txtLogin_Username + "'";
                SqlConnection con = new SqlConnection(sqlcon);
                SqlCommand com2 = new SqlCommand(sqlcom2, con);
                con.Open();
                int eq = com2.ExecuteNonQuery();
                if (eq != 0)
                {
                    MessageBox.Show("头像更换成功！");
                    this.Close();
                }
                else MessageBox.Show("头像更换失败！");
                con.Close();
            }
            else MessageBox.Show("请选择图片!");
            
        }
    }
}

修改账户名：Mdfct_Acct_Username


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace Contact_Manage
{
    public partial class Mdfct_Acct_Username : Form
    {
        public Mdfct_Acct_Username()
        {
            InitializeComponent();
        }

        //点击此文本框时跳出当前登录名
        private void tB_Username_MouseClick(object sender, MouseEventArgs e)
        {
            tB_Username.Text = Login.txtLogin_Username;
        }

        //点击此文本框时跳出当前登录名
        private void tB_NewUsername_MouseClick(object sender, MouseEventArgs e)
        {
            tB_Username.Text = Login.txtLogin_Username;
        }

        private void btt_Modfct_Username_Click(object sender, EventArgs e)
        {
            //获取用户输入的新用户名
            String newUsername = tB_NewUsername.Text;
            if (newUsername == "")
            {
                MessageBox.Show("请输入新用户名！");
                return;
            }

            //连接数据库更改用户名
            String sqlcon = "server=.;database=phone_Book;uid=sa;pwd=666888;";
            String sqlcom = "update Account set Account_Username='"+newUsername+"' where Account_Username='"+Login.txtLogin_Username+"'";
            SqlConnection con = new SqlConnection(sqlcon);
            SqlCommand com = new SqlCommand(sqlcom, con);
            con.Open();
            int eq=com.ExecuteNonQuery();
            if (eq != 0)
            {
                MessageBox.Show("修改成功!");
                this.Close();
                Login.txtLogin_Username = newUsername;
            }
            else MessageBox.Show("修改失败！");

        }
    }
}
 

联系人管理：Contact_Manage

C#结合数据库开发通讯录管理系统

 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Configuration;
namespace Contact_Manage
{
public partial class Contact_Manage : Form
{
//数据库连接字符串
string sqlcon = "server=.;database=phone_Book;uid=sa;pwd=666888";
public Contact_Manage()
{
InitializeComponent();
}
//查询事件
private void button1_Click(object sender, EventArgs e)
{
string condition = " 1=1";
//姓名
if (tB_Name.Text != "")
condition = condition + " and Contact_Name like'" + tB_Name.Text + "%'";
//电话
if (tB_Phone.Text != "")
condition = condition + " and Contact_Phone like'" + tB_Phone.Text + "%'";
//QQ
if (tB_QQ.Text != "")
condition = condition + " and Contact_QQ like'" + tB_QQ.Text + "%'";
//Email
if (tB_Email.Text != "")
condition = condition + " and Contact_Email like'" + tB_Email.Text + "%'";
//ID
if (tB_ID.Text != "")
{
condition = condition + " and Contact_ID='" + tB_ID.Text + "'";
}
string sqlcom = "select * from Contact where" + condition;
SqlConnection con = new SqlConnection(sqlcon);
con.Open();
SqlDataAdapter adapter = new SqlDataAdapter(sqlcom, con);
//设置默认列不显示
//dataGridView1.AutoGenerateColumns = false;
DataSet ds = new DataSet();
adapter.Fill(ds,"cs");
dataGridView1.DataSource = ds.Tables["cs"];//绑定
con.Close();
//清空所有文本框
foreach (Control item in this.Controls)
{
if (item is TextBox)
{
item.Text = "";
}
}
//显示用户名
lb_Username.Text = Login.txtLogin_Username;
String sqlcom2 = "select Account_Image from Account where Account_Username='" + Login.txtLogin_Username + "'";
SqlConnection con2 = new SqlConnection(sqlcon);
SqlCommand com2 = new SqlCommand(sqlcom2, con2);
con2.Open();
//返回结果集的第一行第一列
object obj = com2.ExecuteScalar();
//将数据库中读取到的路径放入变量中
String image_Path = obj.ToString();
con2.Close();
pctrB_Image.Image = Image.FromFile(image_Path);
//将图片居中显示
pctrB_Image.SizeMode = PictureBoxSizeMode.StretchImage;
}
//修改事件
private void btt_Modification_Click(object sender, EventArgs e)
{
//获取用户输入的要修改的联系人ID
String modification_ID = tB_ID.Text;
//如果文本框为空，则说明用户没有点击联系人
if (modification_ID != "")
{
String condition = "";
//姓名
/* if (tB_Name.Text != "")
condition = condition + ",Contact_Name='" + tB_Name.Text + "'";*/
//电话
if (tB_Phone.Text != "")
condition = condition + ",Contact_Phone='" + tB_Phone.Text + "'";
//QQ
if (tB_QQ.Text != "")
condition = condition + ",Contact_QQ='" + tB_QQ.Text + "'";
//Email
if (tB_Email.Text != "")
condition = condition + ",Contact_Email='" + tB_Email.Text + "'";
String sqlcom = "update Contact set Contact_Name='" + tB_Name.Text + "'" + condition + " where Contact_ID = '" + modification_ID + "'";
SqlConnection con = new SqlConnection(sqlcon);
SqlCommand com = new SqlCommand(sqlcom, con);
con.Open();
int eq = com.ExecuteNonQuery();
if (eq != 0)
{
MessageBox.Show("修改成功思密达！");
}
else MessageBox.Show("修改失败思密达！");
con.Close();
foreach (Control item in this.Controls)
{
if (item is TextBox)
{
item.Text = "";
}
}
}
else MessageBox.Show("请先点击联系人再进行修改操作！");
}
//删除事件
private void btt_Delete_Click(object sender, EventArgs e)
{
//获取用户输入的要删除的联系人ID
String delete_ID = tB_ID.Text;
//连接数据库将该联系人数据删除
String sqlcom = "delete from Contact where Contact_ID='" + delete_ID + "'";
SqlConnection con = new SqlConnection(sqlcon);
SqlCommand com = new SqlCommand(sqlcom, con);
con.Open();
int eq = com.ExecuteNonQuery();
if (eq != 0)
{
MessageBox.Show("删除成功思密达！");
}
else MessageBox.Show("删除失败思密达！");
con.Close();
//清空文本框
foreach (Control item in this.Controls)
{
if (item is TextBox)
{
item.Text = "";
}
}
}
//提示用户进行联系人管理时的操作说明 并显示用户名和头像
private void btt_Hint_Click(object sender, EventArgs e)
{
//显示用户名
lb_Username.Text = Login.txtLogin_Username;
String sqlcom = "select Account_Image from Account where Account_Username='" + Login.txtLogin_Username + "'";
SqlConnection con = new SqlConnection(sqlcon);
SqlCommand com = new SqlCommand(sqlcom, con);
con.Open();
//返回结果集的第一行第一列
object obj = com.ExecuteScalar();
//将数据库中读取到的路径放入变量中
String image_Path = obj.ToString();
con.Close();
pctrB_Image.Image = Image.FromFile(image_Path);
//将图片居中显示
pctrB_Image.SizeMode = PictureBoxSizeMode.StretchImage;
MessageBox.Show("查询：文本框全为空时，点击查询将列出所有数据，除ID之外都为模糊查询。\r删除：点击要删除的行。\r修改：ID不可改");
}
private void tB_Name_MouseClick(object sender, MouseEventArgs e)
{
//显示用户名
lb_Username.Text = Login.txtLogin_Username;
String sqlcom = "select Account_Image from Account where Account_Username='" + Login.txtLogin_Username + "'";
SqlConnection con = new SqlConnection(sqlcon);
SqlCommand com = new SqlCommand(sqlcom, con);
con.Open();
//返回结果集的第一行第一列
object obj = com.ExecuteScalar();
//将数据库中读取到的路径放入变量中
String image_Path = obj.ToString();
con.Close();
pctrB_Image.Image = Image.FromFile(image_Path);
//将图片居中显示
pctrB_Image.SizeMode = PictureBoxSizeMode.StretchImage;
}
private void dataGridView1_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)
{
tB_ID.Text = this.dataGridView1.Rows[e.RowIndex].Cells[0].Value.ToString();
tB_Name.Text = this.dataGridView1.Rows[e.RowIndex].Cells[1].Value.ToString();
tB_QQ.Text = this.dataGridView1.Rows[e.RowIndex].Cells[2].Value.ToString();
tB_Phone.Text = this.dataGridView1.Rows[e.RowIndex].Cells[3].Value.ToString();
tB_Email.Text = this.dataGridView1.Rows[e.RowIndex].Cells[4].Value.ToString();
}
}
}

   课余时间写了这么个东西，技术不成熟，勿怪，winform入门可做参考！

   有需要的可以下载：C#结合数据库开发的通讯录管理系统-C#代码类资源-CSDN下载

  或者关注我的公众号回复“通讯录管理”即可获取（包含数据库备份）。
  微信搜索“ChaoYoung”或扫描下面二维码即可关注，后续该公众号将分享更多技术干货和工具

更多技术干货，欢迎关注我的公众号：ChaoYoung

C#结合数据库开发通讯录管理系统

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