每次调整列宽，影响显示性能。

vnpy/trader/uiBasicWidget.py

@@ -359,7 +359,7 @@ class BasicMonitor(QtWidgets.QTableWidget):
                     self.setItem(0, n, cell)
 
             # 调整列宽
-            self.resizeColumns()
+            #self.resizeColumns()
 
             # 重新打开排序
             if self.sorting:
@@ -1111,6 +1111,7 @@ class TradingWidget(QtWidgets.QFrame):
     #----------------------------------------------------------------------
     def sendOrder(self):
         """发单"""
+        try:
             symbol = str(self.lineSymbol.text())
             vtSymbol = symbol
             exchange = self.comboExchange.currentText()
@@ -1131,6 +1132,13 @@ class TradingWidget(QtWidgets.QFrame):
                     gatewayName = contract.gatewayName
                 exchange = contract.exchange    # 保证有交易所代码
 
+            if gatewayName not in self.mainEngine.connected_gw_names:
+                if len(self.mainEngine.connected_gw_names) == 1:
+                    gatewayName = self.mainEngine.connected_gw_names[0]
+                else:
+                    self.mainEngine.writeError(u'没有连接网关:{}'.format(gatewayName))
+                    return
+
             req = VtOrderReq()
             req.symbol = symbol
             req.vtSymbol = vtSymbol
@@ -1144,6 +1152,9 @@ class TradingWidget(QtWidgets.QFrame):
             req.productClass = productClass
 
             self.mainEngine.sendOrder(req, gatewayName)
+        except Exception as ex:
+            self.mainEngine.writeError(
+                u'tradingWg.sendOrder exception:{},{}'.format(str(ex), traceback.format_exc()))
 
     def canelOrder(self):
         """撤单"""
@@ -1290,7 +1301,8 @@ class ContractMonitor(BasicMonitor):
         l = self.mainEngine.getAllContracts()
         d = {'.'.join([contract.exchange, contract.symbol]):contract for contract in l}
         l2 = d.keys()
-        l2.sort(reverse=True)
+        #l2.sort(reverse=True)
+        l2 = sorted(l2, reverse=True)
 
         self.setRowCount(len(l2))
         row = 0