用户登录系统（三）

下面就是对主窗体的操作了：

首先将test.DAL 和test.BLL引入

然后编辑代码如下：

    public partial class Form1 : Form
    {
        #region 窗体登录
        public Form1()
        {
            InitializeComponent();
            dataGridView1.DataSource = test_BLL.User_info.UserinfoManager.getUserTable();
        }
        #endregion

        #region 刷新datagridview数据
        public void refresh()
        {
            dataGridView1.DataSource = test_BLL.User_info.UserinfoManager.getUserTable();
        }
        #endregion

        #region 清除testbox
        public void clear()
        {
            this.textBox1.Clear();
            this.textBox2.Clear();
            this.textBox3.Clear();
        }
        #endregion

        #region 用户新增
        private void toolStripButton1_Click_1(object sender, EventArgs e)
        {
            this.clear();
            this.textBox1.Focus();
        }
        #endregion

        #region 用户修改
        private void toolStripButton2_Click(object sender, EventArgs e)
        {
            this.textBox1.Focus();
            int index = dataGridView1.CurrentRow.Index;
            if (index != -1)
            {
                object str = dataGridView1.SelectedRows[0].Cells[1].Value;
                object str1 = dataGridView1.SelectedRows[0].Cells[2].Value;
                object str2 = dataGridView1.SelectedRows[0].Cells[3].Value;
                SqlDataReader sdr = test_BLL.User_info.UserinfoManager.selectUser(str.ToString());
                if (sdr.HasRows && sdr.Read())
                {
                    textBox1.Text = sdr.GetValue(1).ToString();
                    textBox2.Text = sdr.GetValue(2).ToString();
                    textBox3.Text = sdr.GetValue(3).ToString();
                }
                sdr.Close();
            }
            else
            {
                MessageBox.Show("请选择右侧数据");
            }
        }
        #endregion

        #region 用户删除
        private void toolStripButton3_Click(object sender, EventArgs e)
        {
            DialogResult dr = MessageBox.Show("确定删除？");
            if (dr == DialogResult.OK)
            {
                int index = dataGridView1.CurrentRow.Index;
                if (index != -1)
                {
                    //也可以不用一下的判断
                    SqlDataReader sdr =tset.DAL.Common.SqlHelper.GetReader(this.dataGridView1.SelectedRows[0].Cells[1].Value.ToString());
                    if (sdr.HasRows)
                    {
                        test_BLL.User_info.UserinfoManager.DeleteUser(this.dataGridView1.SelectedRows[0].Cells[1].Value.ToString());

                        MessageBox.Show("删除成功");
                    }
                    else
                    {
                        MessageBox.Show("删除失败");
                    }
                }
            }
            this.refresh();
            this.clear();
        }
        #endregion

        #region 用户登录
        private void toolStripButton4_Click(object sender, EventArgs e)
        {
            if (this.textBox1.Text == "" || this.textBox2.Text == "" || this.textBox3.Text == "")
            {
                MessageBox.Show("请填写登录信息");
                this.label4.Text = "登录失败";
            }
            else
            {
                SqlDataReader sdr;
                sdr = test_BLL.User_info.UserinfoManager.userLogin(this.textBox1.Text, this.textBox2.Text, this.textBox3.Text);
                if (sdr.HasRows)
                {
                    this.label4.Text = this.textBox2.Text + "登录成功！";
                }
                else
                {
                    MessageBox.Show("请重新填写登录信息");
                    this.textBox1.Focus();
                    this.label4.Text = this.textBox1.Text + "用户名或密码错误！";
                }
                this.refresh();
                this.clear();
            }
        }
        #endregion

        #region 重置
        private void button1_Click(object sender, EventArgs e)
        {
            this.refresh();
            this.clear();
        }
        #endregion

        #region 保存
        private void button2_Click(object sender, EventArgs e)
        {
            if (this.textBox1.Text == "" || this.textBox2.Text == "" || this.textBox3.Text == "")
            {
                MessageBox.Show("您填写的信息有误！");
            }
            else
            {
                SqlDataReader sdr = test_BLL.User_info.UserinfoManager.selectUser(this.textBox1.Text); ;
                if (sdr.HasRows)
                {
                    test_BLL.User_info.UserinfoManager.UpdateUser(this.textBox1.Text, this.textBox2.Text, this.textBox3.Text);
                    MessageBox.Show("修改成功");
                }
                else
                {
                    test_BLL.User_info.UserinfoManager.InsertUser(this.textBox1.Text, this.textBox2.Text, this.textBox3.Text);
                    MessageBox.Show("新增成功");
                }
                sdr.Close();
                this.refresh();
                this.clear();
            }
        }
        #endregion

        #region 查找
        private void button3_Click(object sender, EventArgs e)
        {
            string textbox_search = "";
            textbox_search = this.textBox4.Text;
            if (textbox_search != "")
            {
                DataTable dt = test_BLL.User_info.UserinfoManager.getConditionUserTable(textbox_search, textbox_search, textbox_search);
            }
            else
            {
                refresh();
            }
        }
        #endregion
    }

这样一个简单的操作用户增删改查的小程序就完成啦！