1、仅调整代码顺序：事件问题太麻烦先不管了

Tools/UI/wMonitorVisit.cs

@@ -30,9 +30,13 @@ namespace Tools.UI
             rdbSelectedByNull.Checked = true;
         }
 
+        /// <summary>
+        /// 设置数据库
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
         private void tsbDB_Click(object sender, EventArgs e)
         {
-            //数据库
             var frm = new wDbSetting();
             if (frm.ShowDialog() == DialogResult.OK)
             {
@@ -49,7 +53,6 @@ namespace Tools.UI
                 cmbModelList.SelectedIndex = 0;
             }
         }
-
         /// <summary>
         /// 设置数据库链接
         /// </summary>
@@ -60,6 +63,19 @@ namespace Tools.UI
             this.tstbLinkString.Text = m.ToString();
         }
 
+        private void cmbModelList_SelectedIndexChanged(object sender, EventArgs e)
+        {
+            RefrashData();
+        }
+        private void rdbSelected_CheckedChanged(object sender, EventArgs e)
+        {
+            RefrashData();
+        }
+        private void btnSelected_Click(object sender, EventArgs e)
+        {
+            RefrashData();
+        }
+
         private void RefrashData()
         {
             if (cmbModelList.DataSource == null)
@@ -76,7 +92,6 @@ namespace Tools.UI
                 strDataSelected = "CONVERT(NVARCHAR(4),a.CreateDate,120)";
 
             StringBuilder sb = new StringBuilder();
-
             sb.AppendLine($@"
               SELECT ModelCode,b.Name as ModelName,{(string.IsNullOrEmpty(strDataSelected) ? "''" : strDataSelected)} AS CreateDate,COUNT(*) AS Count  FROM [App_Sys_ModelVisitLog] a
               INNER JOIN dbo.App_SysBusinessModel b ON a.ModelCode=CAST(b.ID AS NVARCHAR(50)) ");
@@ -88,19 +103,5 @@ namespace Tools.UI
             dgvMessage.DataSource = this._db.GetDataTable(this._link, sb.ToString(), "结果列表");
         }
 
-        private void cmbModelList_SelectedIndexChanged(object sender, EventArgs e)
-        {
-            RefrashData();
-        }
-
-        private void rdbSelected_CheckedChanged(object sender, EventArgs e)
-        {
-            RefrashData();
-        }
-
-        private void btnSelected_Click(object sender, EventArgs e)
-        {
-            RefrashData();
-        }
     }
 }