基本信息

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   源码介绍

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邮件信息系统

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel;
using System.Data.SqlClient;



namespace EmailUserDB
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        SqlConnection con;
        private void DBCon()
        {
            string constr = "Data Source=LAPTOP-LKC9B40K;Initial Catalog=EmailUserDB;Integrated Security=True";
            con = new SqlConnection(constr);
        }

        private void DView()
        {
            try
            {
                DBCon();
                string sql = string.Format("select * from EmailUsers");
                DataSet ds = new DataSet();
                SqlDataAdapter dar = new SqlDataAdapter(sql, con);
                dar.Fill(ds);
                dataGridView1.DataSource = ds.Tables[0];

                comboBox1.DisplayMember = "username";//绑定前端需要显示的字段，语句
                comboBox1.DataSource = ds.Tables[0].DefaultView;//绑定数据源
                comboBox1.ValueMember = "username";//绑定数据的标识，一般是ID
            }
            catch (SystemException ex)
            {
                MessageBox.Show("错误"   ex.Message, "错误提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
            }
            finally
            {
                if (con.State == ConnectionState.Open)//判断通道状态
                {
                    con.Close();
                    con.Dispose();
                }
            }

        }

        private bool dbUpdate()
        {
            string sql = "select * from EmailUsers";
            DataTable dt1 = new DataTable();
            SqlDataAdapter dar = new SqlDataAdapter(sql, con);
            dar.Fill(dt1);
            dt1.Rows.Clear();

            DataTable dt2 = new DataTable();
            dt2 = (DataTable)dataGridView1.DataSource;
            for (int i = 0; i < dt2.Rows.Count; i  )
            {
                dt1.ImportRow(dt2.Rows[i]);
            }

            try
            {
                this.con.Open();
                SqlCommandBuilder cb = new SqlCommandBuilder(dar);//批量更新数据库
                dar.Update(dt1);
                con.Close();
            }
            catch(Exception ex)
            {
                MessageBox.Show("保存出错！！" ex.Message);
                return false;
            }
            dt1.AcceptChanges();
            return true;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // TODO: 这行代码将数据加载到表“emailUserDBDataSet.EmailUsers”中。您可以根据需要移动或删除它。
            this.emailUsersTableAdapter.Fill(this.emailUserDBDataSet.EmailUsers);
            DView();
        }

        private void bnt_insert_Click(object sender, EventArgs e)
        {
            DBCon();
            string username = comboBox1.Text.Trim();
            string pwd = textBox1.Text.Trim();
            string name = textBox2.Text.Trim();
            string sql = string.Format("insert into EmailUsers values('{0}','{1}','{2}')",username,pwd,name);
            SqlCommand cmd = new SqlCommand(sql,con);
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
            DView();
        }

        private void bnt_update_Click(object sender, EventArgs e)
        {
            DBCon();
            string username = comboBox1.Text;
            string pwd = textBox1.Text.Trim();
            string name = textBox2.Text.Trim();
            string sql = string.Format("update EmailUsers set password='{0}' , realname='{1}' where username='{2}'",pwd,name,username);
            SqlCommand cmd = new SqlCommand(sql, con);
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
            DView();
        }

        private void bnt_delect_Click(object sender, EventArgs e)
        {
            DBCon();
            string username = comboBox1.Text.Trim();
            string sql = string.Format("delete EmailUsers where username='{0}'",username);
            SqlCommand cmd = new SqlCommand(sql,con);
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
            DView();
            comboBox1.Text = "";
            textBox1.Text = "";
            textBox2.Text = "";
        }

        private void bnt_select_Click(object sender, EventArgs e)
        {
            DBCon();
            string username = comboBox1.Text;
            string pwd = textBox1.Text.Trim();
            string name = textBox1.Text.Trim();
            string sql = string.Format("select * from EmailUsers where username='{0}' password='{1}' realname='{2}'",  username,pwd, name);
            SqlCommand cmd = new SqlCommand(sql, con);
            con.Open();
            DataTable dt = new DataTable();
            SqlDataAdapter dar = new SqlDataAdapter(sql, con);
            dar.Fill(dt);
            dataGridView1.DataSource = dt;
            con.Close();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string Sql = "select * from EmailUsers";
            SqlDataAdapter sda = new SqlDataAdapter(Sql, con);
            DataSet ds = new DataSet();
            sda.Fill(ds);
            DataView dv = ds.Tables[0].DefaultView;
            if (radioButton1.Checked)
            {
                dv.Sort = "username";
            }
            else if (radioButton2.Checked)
            {
                dv.Sort = "password";
            }
            else
            {
                dv.Sort = "realname";
            }
            dataGridView1.DataSource = dv;
            button3.Text = "编辑数据";

        }

        private void button2_Click(object sender, EventArgs e)
        {
            string strSql = "select * from EmailUsers";
            SqlDataAdapter sda = new SqlDataAdapter(strSql, con);
            DataSet ds = new DataSet();
         
            DataView dv = ds.Tables[0].DefaultView;

            if (radioButton1.Checked)
            {
                dv.RowFilter = string.Format("username like '{0}'",comboBox1.Text);
            }
            else if (radioButton2.Checked)
            {
                dv.RowFilter =string.Format("password like '{0}'",textBox1.Text.Trim());
            }
            else
            {
                dv.RowFilter = string.Format("realname like '{0}'",textBox2.Text.Trim());
            }
            dv.RowStateFilter = DataViewRowState.CurrentRows;
            dataGridView1.DataSource = dv;
            button3.Text = "编辑数据";

        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (button3.Text == "保存数据编辑")
            {
                if (dbUpdate())
                {
                    MessageBox.Show("数据库操作成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                button3.Text = "编辑数据";

            }
            else
            {
                DView();
                button3.Text = "保存数据编辑";
            }

        }

        private bool DataGridviewToExcel(DataGridView dg, bool ShowExcle)
        {
            if (dg.Rows.Count == 0) return false;
            Excel.Application ex = new Excel.Application();
            ex.Application.Workbooks.Add(true);
            ex.Visible = ShowExcle;
            for (int i = 0; i < dg.ColumnCount; i  )
            {
                ex.Cells[1, i   1] = dg.Columns[i].HeaderText;
            }

            for (int i = 0; i < dg.RowCount; i  )
            {
                for (int j = 0; j < dg.ColumnCount; j  )
                {
                    ex.Cells[i   2, j   1] = dg[j, i].Value.ToString();
                }
            }
            return true;

        }

        private void button4_Click(object sender, EventArgs e)
        {
            DataGridviewToExcel(dataGridView1,true);
        }

        private void button5_Click(object sender, EventArgs e)
        {
            DView();
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        private void button6_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }
    }
}