C#winform为什么我写方法里调用这个代码（如下）datagridview不能显示，写在按钮里就可以呢？

这是我写方法里的代码，就是机器下压时会调用这个updateMeasurementListView();但是调用完成后datagridview并没有显示。
但是我单独在按钮里调用这些代码就可以在datagridview里面显示，请问为什么呢？

private void updateMeasurementListView(int countco)
        {
            try
            {
                string jsonParas = "workorder_id=" + 4 + "&" + "product_id=" + 1 + "&" + "process_no=" + 10 + "&" + "process_no_order=" + 2 + "&" +
            "L=" + trialValues[0] + "&" + "a=" + trialValues[1] + "&" + "b=" + trialValues[2] + "&" +
            "standard_id=" + 1 + "&" + "color=" + "红色" + "&" + "address_no=" + 8 + "&";

                string url = "XXXXXXXXXXXXXXXXXXXXXXXX";
                 string getJson = HttpUitls.Post(url, jsonParas, "POST");
                JObject jt = JObject.Parse(getJson);
                int judge = (int)jt["data"]["is_show"];
                if (judge == 1)
                {
                    DataTable x = JsonToDataTable(getJson);
                    dataGridView1.DataSource = x;
                    dataGridView1.Rows[0].Selected = false;
                }
            }
            catch
            {

            }
        }