点击查询就出错了！

liato

错误信息
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System.InvalidOperationException: 可为空的对象必须具有一个值。
   在 System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
   在 System.Nullable`1.get_Value()
   在 TOBA.Entity.QueryParam..(QueryResultItem ) 位置 #Td:行号 735
   在 System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   在 System.Linq.Enumerable.Min[TSource](IEnumerable`1 source)
   在 TOBA.Entity.QueryParam.
(IEnumerable`1 ) 位置 #Td:行号 735
   在 ..
(Boolean ) 位置 #8:行号 309
   在 ..() 位置 #8:行号 274
   在 ..(Object , EventArgs ) 位置 #8:行号 114
   在 ..() 位置 #Se:行号 110
   在 ..(Object ) 位置 #Se:行号 264

环境信息
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操作系统版本：Microsoft Windows NT 6.1.7601 Service Pack 1
程序运行目录：C:\Users\Administrator\Desktop\12306订票助手.NET_2.1.0.731\12306订票助手.NET

模块信息
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[001]. mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorlib.dll
[002]. 12306订票助手, Version=2.5.8.855, Culture=neutral, PublicKeyToken=063375134da4cdc3 , C:\Users\Administrator\Desktop\12306订票助手.NET_2.1.0.731\12306订票助手.NET\12306订票助手.exe
[003]. System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a , C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Drawing\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Drawing.dll
[004]. System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll
[005]. System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Windows.Forms\v4.0_4.0.0.0__b77a5c561934e089\System.Windows.Forms.dll
[006]. System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a , C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll
[007]. System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Core\v4.0_4.0.0.0__b77a5c561934e089\System.Core.dll
[008]. System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xml\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.dll
[009]. {fffb3a52-7aeb-4070-bb26-b1c481b718f7}, Version=0.0.0.0, Culture=neutral, PublicKeyToken=3e56350693f7355e ,
[010]. Newtonsoft.Json, Version=4.5.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed , C:\Users\Administrator\Desktop\12306订票助手.NET_2.1.0.731\12306订票助手.NET\Newtonsoft.Json.dll
[011]. System.Numerics, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Numerics\v4.0_4.0.0.0__b77a5c561934e089\System.Numerics.dll
[012]. System.ComponentModel.DataAnnotations, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 , C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.ComponentModel.DataAnnotations\v4.0_4.0.0.0__31bf3856ad364e35\System.ComponentModel.DataAnnotations.dll
[013]. System.Runtime.Serialization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Runtime.Serialization\v4.0_4.0.0.0__b77a5c561934e089\System.Runtime.Serialization.dll
[014]. System.Xml.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Xml.Linq\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.Linq.dll
[015]. System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 , C:\Windows\Microsoft.Net\assembly\GAC_32\System.Data\v4.0_4.0.0.0__b77a5c561934e089\System.Data.dll
[016]. BetterListViewExpress, Version=3.8.2.0, Culture=neutral, PublicKeyToken=e6c91a3add447be2 , C:\Users\Administrator\Desktop\12306订票助手.NET_2.1.0.731\12306订票助手.NET\BetterListViewExpress.dll
[017]. mscorlib.resources, Version=4.0.0.0, Culture=zh-Hans, PublicKeyToken=b77a5c561934e089 , C:\Windows\Microsoft.Net\assembly\GAC_MSIL\mscorlib.resources\v4.0_4.0.0.0_zh-Hans_b77a5c561934e089\mscorlib.resources.dll
[018]. SimpleUpdater, Version=2.3.4.5, Culture=neutral, PublicKeyToken=8bf54bd6729f490c , C:\Users\Administrator\Desktop\12306订票助手.NET_2.1.0.731\12306订票助手.NET\SimpleUpdater.dll
[019]. ?, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null ,  不可用信息 (动态程序集)
[020]. Accessibility, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a , C:\Windows\Microsoft.Net\assembly\GAC_MSIL\Accessibility\v4.0_4.0.0.0__b03f5f7f11d50a3a\Accessibility.dll
[021]. System.Windows.Forms.resources, Version=4.0.0.0, Culture=zh-Hans, PublicKeyToken=b77a5c561934e089 , C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Windows.Forms.resources\v4.0_4.0.0.0_zh-Hans_b77a5c561934e089\System.Windows.Forms.resources.dll
[022]. Microsoft.GeneratedCode, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null ,  不可用信息 (动态程序集)
[023]. System.resources, Version=4.0.0.0, Culture=zh-Hans, PublicKeyToken=b77a5c561934e089 , C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.resources\v4.0_4.0.0.0_zh-Hans_b77a5c561934e089\System.resources.dll
[024]. System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a , C:\Windows\Microsoft.Net\assembly\GAC_32\System.Web\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Web.dll