c# - 用线程 c# 填充 datagridview

Question

我试图从 sql 查询填充 datagridview 但它需要很长时间，我试图做的是显示 .gif“加载”同时填充网格，我使用线程但 .gif 卡住，并且如果我使用 CheckForIllegalCrossThreadCalls = false;，则 datagridview 不会加载滚动条，这很奇怪。这是我的代码

delegate void CambiarProgresoDelegado(); 

点击按钮

 private void btn_busca_Click(object sender, EventArgs e)
    {
        pictureBox1.Visible = true;
       thread=  new Thread(new ThreadStart(ejecuta_sql));
        thread.Start();
    }

方法

private void ejecuta_sql()
    {

if (this.InvokeRequired)
        {         

         CambiarProgresoDelegado delegado = new CambiarProgresoDelegado(ejecuta_sql);

        object[] parametros = new object[] { };
          this.Invoke(delegado, parametros);
       }
        else
        {
            myConnection.Open();
            SqlCommand sql_command2;
            DataSet dt2 = new DataSet();

            sql_command2 = new SqlCommand("zzhoy", myConnection);
            sql_command2.CommandType = CommandType.StoredProcedure;
            sql_command2.Parameters.AddWithValue("@FechaIni", dateTimePicker1.Value.ToShortDateString());
            sql_command2.Parameters.AddWithValue("@FechaFin", dateTimePicker2.Value.ToShortDateString());
            SqlDataAdapter da2 = new SqlDataAdapter(sql_command2);
            da2.Fill(dt2, "tbl1");
            grid_detalle.DataSource = dt2.Tables[0];
            myConnection.Close();
            pictureBox1.Visible = false;


        }

并且 .gif 卡住，直到线程完成他的工作。

Answer 1

您创建了一个线程，但随后立即使用 Invoke() 将代码切换回主 UI 线程，从而否定了创建线程的任何好处。

在另一个线程上运行查询，然后 Invoke() 只是更新 UI 的部分:

    private string FechaIni;
    private string FechaFin;

    private void btn_busca_Click(object sender, EventArgs e)
    {
        btn_busca.Enabled = false;
        pictureBox1.Visible = true;
        FechaIni = dateTimePicker1.Value.ToShortDateString();
        FechaFin = dateTimePicker2.Value.ToShortDateString();
        thread = new Thread(new ThreadStart(ejecuta_sql));
        thread.Start();
    }

    private void ejecuta_sql()
    {
        myConnection.Open();
        SqlCommand sql_command2;
        DataSet dt2 = new DataSet();

        sql_command2 = new SqlCommand("zzhoy", myConnection);
        sql_command2.CommandType = CommandType.StoredProcedure;
        sql_command2.Parameters.AddWithValue("@FechaIni", FechaIni);
        sql_command2.Parameters.AddWithValue("@FechaFin", FechaFin);
        SqlDataAdapter da2 = new SqlDataAdapter(sql_command2);
        da2.Fill(dt2, "tbl1");
        myConnection.Close();

        this.Invoke((MethodInvoker)delegate { 
            grid_detalle.DataSource = dt2.Tables[0];
            pictureBox1.Visible = false;
            btn_busca.Enabled = true;
        });
    }