Question

我在三层中感到困惑没有使用3层这个功能工作

DataTable dt; 
private void textBox1_TextChanged(object sender, EventArgs e)
        {
            DataView dv = new DataView(dt);
            dv.RowFilter = string.Format("emp_f_name LIKE '%{0}%'",textBox1.Text);
            dataGridView1.DataSource = dv;

        }

3层中的BUt 我很困惑，你们可以帮助我重写我试图在文本框中搜索名字的代码

在我的bll课程中

public DataTable Display(string fname)
        {
            try
            {

                return obj.Display(fname);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

在我的dal课程中

  public DataTable Display(string fname)
        {
            string query2;

            OpenCnn();
            query2 = "SELECT * FROM cntc_employee where fname='" +fname + "' ";
            sda = new SqlDataAdapter(query2, con);
            dt = new DataTable();
            sda.Fill(dt);
            CloseCnn();
            return dt;
        }

班级

 private void textBox1_TextChanged(object sender, EventArgs e)
        {
            string fname = txtfname.Text;
           DataView dv = new DataView(dt);
          dt = obj.Display(fname);
           dv.RowFilter = string.Format("emp_f_name LIKE '%{0}%'", textBox1.Text);

            dataGridView1.DataSource = dv;
            this.dataGridView1.DataSource = obj.Display(this.txtfname.Text);
        }

Answer 1

这是你想要的吗？你的BLL课应该是这样的

public DataTable Display(string fname)
        {
            try
            {
                DataTable dt = obj.Display(fname);//call to DAL
                DataView dv = new DataView(dt);
                dv.RowFilter = string.Format("emp_f_name LIKE '%{0}%'",
                textBox1.Text);
                return dv.ToTable();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

在你的用户界面

private void textBox1_TextChanged(object sender, EventArgs e)
        {
            string fname = txtfname.Text;
            dt = obj.Display(fname);// Call to BLL
            dataGridView1.DataSource = dt;
        }

在你的DAL课程中

  public DataTable Display(string fname)
        {
            string query2;

            OpenCnn();
            query2 = "SELECT * FROM cntc_employee where fname='" +fname + "' ";
            sda = new SqlDataAdapter(query2, con);
            dt = new DataTable();
            sda.Fill(dt);
            CloseCnn();
            return dt;
        }

在3tier架构中执行搜索

1 个答案: