| Class | Description |
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![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | CorridorState |
Contains a wide array of information about a corridor and methods for determining locations relative
to the corridor. Used in the creation of custom subassemblies.
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![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | Param | Obsolete.
Use Autodesk.Civil.IParam instead.
|
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamAlignment |
Alignment parameter.
|
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamAlignmentCollection | A collection of Alignment parameters. |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamBase<1,bool,bool,Autodesk::Civil::Runtime::CastOp<bool,bool> > | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamBase<10,Autodesk::Civil::DatabaseServices::SlopeElevationTarget ^,AcArray<AcDbObjectId,AcArrayMemCopyReallocator<AcDbObjectId> >,Autodesk::Civil::Runtime::CastOp<Autodesk::Civil::DatabaseServices::SlopeElevationTarget ^,AcArray<AcDbObjectId,AcArrayMemCopyReallocator<AcDbObjectId> > > > | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamBase<2,long,long,Autodesk::Civil::Runtime::CastOp<long,long> > | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamBase<3,double,double,Autodesk::Civil::Runtime::CastOp<double,double> > | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamBase<4,System::String ^,AecRmCString,Autodesk::Civil::Runtime::CastOp<System::String ^,AecRmCString> > | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamBase<5,Autodesk::AutoCAD::Geometry::Point3d,AcGePoint3d,Autodesk::Civil::Runtime::CastOp<Autodesk::AutoCAD::Geometry::Point3d,AcGePoint3d> > | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamBase<6,Autodesk::AutoCAD::DatabaseServices::ObjectId,AcDbObjectId,Autodesk::Civil::Runtime::CastOpAlignmentId> | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamBase<7,Autodesk::AutoCAD::DatabaseServices::ObjectId,AcDbObjectId,Autodesk::Civil::Runtime::CastOpProfileId> | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamBase<8,Autodesk::AutoCAD::DatabaseServices::ObjectId,AcDbObjectId,Autodesk::Civil::Runtime::CastOpSurfaceId> | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamBase<9,Autodesk::Civil::DatabaseServices::WidthOffsetTarget ^,AcArray<AcDbObjectId,AcArrayMemCopyReallocator<AcDbObjectId> >,Autodesk::Civil::Runtime::CastOp<Autodesk::Civil::DatabaseServices::WidthOffsetTarget ^,AcArray<AcDbObjectId,AcArrayMemCopyReallocator<AcDbObjectId> > > > | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamBool | A boolean parameter. |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamBoolCollection | A collection of boolean parameters. |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamCollectionBase<Autodesk::Civil::Runtime::ParamAlignment,Autodesk::Civil::Runtime::ParamAlignment ^> | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamCollectionBase<Autodesk::Civil::Runtime::ParamBool,Autodesk::Civil::Runtime::ParamBool ^> | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamCollectionBase<Autodesk::Civil::Runtime::ParamDouble,Autodesk::Civil::Runtime::ParamDouble ^> | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamCollectionBase<Autodesk::Civil::Runtime::ParamElevationTarget,Autodesk::Civil::Runtime::ParamElevationTarget ^> | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamCollectionBase<Autodesk::Civil::Runtime::ParamLong,Autodesk::Civil::Runtime::ParamLong ^> | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamCollectionBase<Autodesk::Civil::Runtime::ParamOffsetTarget,Autodesk::Civil::Runtime::ParamOffsetTarget ^> | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamCollectionBase<Autodesk::Civil::Runtime::ParamPoint,Autodesk::Civil::Runtime::ParamPoint ^> | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamCollectionBase<Autodesk::Civil::Runtime::ParamProfile,Autodesk::Civil::Runtime::ParamProfile ^> | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamCollectionBase<Autodesk::Civil::Runtime::ParamString,Autodesk::Civil::Runtime::ParamString ^> | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamCollectionBase<Autodesk::Civil::Runtime::ParamSurface,Autodesk::Civil::Runtime::ParamSurface ^> | |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamDouble |
A parameter with a double value.
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![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamDoubleCollection |
A collection of double parameters.
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![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamElevationTarget |
Elevation target parameter.
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![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamElevationTargetCollection | A collection of elevation target parameters. |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamLong |
A long parameter.
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![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamLongCollection | A collection of long parameters. |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamOffsetTarget | An offset target parameter. |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamOffsetTargetCollection | A collection of offset target parameters. |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamPoint | A point parameter. |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamPointCollection | A collection of point parameters. |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamProfile |
A Profile parameter.
|
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamProfileCollection | A collection of profile parameters. |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamString | A string parameter. |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamStringCollection | A collection of string parameters. |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamSurface |
A Surface parameter.
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![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | ParamSurfaceCollection | A collection of surface parameters. |
![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | PipeNetworkState |
Contains the properties of the drawing's pipe network state.
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![Public class Public class](https://help.autodesk.com/cloudhelp/2025/ENU/Civil3D-API/icons/pubClass.gif) | RuntimeState |
Base class for objects containing user-defined parameters describing an object state.
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