添加web service，运行代码后，总是显示未处理的SoapException

[Double_Lan_2975]

如题，总是抛出异常
System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.ArgumentOutOfRangeException: Length cannot be less than zero.
Parameter name: length
at System.String.InternalSubStringWithChecks(Int32 startIndex, Int32 length, Boolean fAlwaysCopy)
at AppLib.AppManager.GetUniqueList(List`1 data, List`1 sensors, Boolean& isUniqueStations) in C:\SenseWeb\src\netembed\NetEmbed\SenseWebV3.1.1\Coordinator\AppLib\AppManager.cs:line 152
at AppLib.AppManager.GetFinalListofSensors(List`1& data, List`1& sensors) in C:\SenseWeb\src\netembed\NetEmbed\SenseWebV3.1.1\Coordinator\AppLib\AppManager.cs:line 198
at AppLib.AppManager.GetDataByPolygonQueryWithAuthentication(String userName, Guid passCode, PointF[] polygon, PointF[] viewport, String searchTerms, Int32[] sensorTypeIDs) in C:\SenseWeb\src\netembed\NetEmbed\SenseWebV3.1.1\Coordinator\AppLib\AppManager.cs:line 133
at AppLib.AppManager.GetDataByPolygonQuery(PointF[] polygon, PointF[] viewport, String searchTerms, Int32[] sensorTypeIDs) in C:\SenseWeb\src\netembed\NetEmbed\SenseWebV3.1.1\Coordinator\AppLib\AppManager.cs:line 71
at Service.GetDataByPolygonQuery(PointF[] polygon, PointF[] viewport, String searchTerms, Int32[] sensorTypeIDs)
--- End of inner exception stack trace ---
是怎么回事啊？请高手们指点哈！！在线等！

[KnowKjava]

SoapException

[zhujiazhi]

length貌似这个值比0小的

[shyboy8]

System.ArgumentOutOfRangeException: Length cannot be less than zero.
Parameter name: length 传入参数跟ws要求不匹配！！造成Server was unable to process request.