对接接口参数验证

codegit/CallCenterApi/CallCenterApi.Interface/CallCenterApi.Interface/Controllers/tel/CallrecordsController.cs

@@ -910,11 +910,11 @@ namespace CallCenterApi.Interface.Controllers.tel
 
                 //sql += " and CallNumber like '%" + phone + "%'";
             }
-            if (callstate.Trim() != "")
+            if (!string.IsNullOrWhiteSpace(callstate))
             {
                 sql += " and CallState='" + callstate + "'";
             }
-            if (calltype.Trim() != "")
+            if (!string.IsNullOrWhiteSpace(calltype))
             {
                 sql += " and CallType='" + calltype + "'";
             }