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具体更新内容参考readme：

The following issues have been resolved in AutoCAD Civil 3D 2012 Service Pack 2:

Alignments

• Creating spiral curve using the Design Criteria: Tan-Tan with Curves no longer results in the application closing unexpectedly.
• Applying a Curve-Line-Curve transition to the end of a curve no longer results in the second curve doubling back on itself.
• An error is no longer generated when modifying a station equation with overlapping values.

API

• AddPointGroup to Surface on .NET no longer generates an error.
• Aeccxuilandloader and AeccSvrLoader no longer generate errors when hovering over some Civil 3D entities with rollover tooltips are enabled.

Catchments

• Creating a Catchment from Object with pickfirst turned on no longer causes the application to close unexpectedly.

Cogo

• The COGO Editor now reports the correct traverse length when using 2 distance unknowns.
• The COGO Editor now retains entries in the description field.

Corridor Design

• Using the Drive command on a Feature Line object no longer causes the application to close unexpectedly.
• An issue where a change to the Offset End Station resulted in an unusable drawing has been resolved.
• Switching between drawings while Station Tracker is enabled no longer causes the application to close unexpectedly.

Corridor Volumes

• Volume calculations using sample lines and section views provide more consistent results.

Cross Section Views

• Performance when using the Change Band Set selection tool in the Section View Group Properties dialog box has been improved.
• Opening a Civil 3D 2010 drawing containing the OverlayAndMill subassembly in Civil 3D 2012 no longer results in a display issue with the section views.

Cross Sections

• The right side of a Sample Line is now visible to the Intersection or Apparent Intersection Osnap commands.
• Referenced Cross Section Labels whose placement has been modified no longer revert back to original their location after reloading the XREF.

Data Exchange

• An imported Structure will now use the expected dimension rather than the dimension of the first Structure of the imported group.

Feature Lines

• Stability when grip editing a Feature Line has been improved.
• Creating Feature Lines from objects when the objects are overlapping closed polylines no longer causes the application to close unexpectedly.

General/Other

• The stability of the Audit command has been improved.
• A memory issue that prevented opening some drawings from previous releases has been resolved.
• An issue that caused an error when closing a drawing has been resolved.
• Renaming a layout while the Sheet Set Manager is open no longer displays an error message in the command line.
• The display of custom linetypes has been improved.
• Right-click menus from Prospector have been updated to resolve display issues.

Grading

• An error while using the Grade to Surface command has been resolved.
• Saving a drawing after running the Automatically raise/lower to balance the volumes command no longer causes the application to close unexpectedly.

Hydraflow Express and Hydraflow Storm Sewers

• The following issues related to Inlet calculations and reporting have been resolved:
  • Inlet Calculations have been clarified to match HEC-22 requirements.
  • Combination inlets in sag conditions now report expected depth and spread results.
  • Slotted drains in sag condition no longer display the gutter spread and gutter depth values as bypass in reports.
  • Slotted drains in sag condition now calculate expected depth and spread values while transitioning between weir and orifice flow.
  • Open Area Design calculations are now less than or equal to the product of grate length and width.
  • 3D images for Inlets without depression specified no longer depict a local depression.
  • 3D images for Inlets with local depression now depict the correct grate slopes.
  • Section images for on-grade inlets now depict the expected results for the entire spread.
  • Inlet efficiency is now calculated as expected when the frontal flow width is less than the gutter width.

Hydraflow Storm Sewers

• Storm Sewer calculations have been clarified to follow methodologies according the HEC-22.
• Storm Sewers using HDS-5 inlet control option now report expected results.
• The following issues related to Inlet calculations and reporting have been resolved:
  • Inlets with no tributary area now report expected flow capture results.
  • Gutter depth and spread no longer calculate as negative values.
  • Inlet Section Views now correctly show the grate slope when there is local depression.
  • Inlet Section View display shows spread correctly in 2D when depression is ignored.
  • A column in Interactive Designer is now labeled "Local Depression" to be consistent with the data-entry field.

Hydraflow Express

• Text in images exports clearly.
• Channel calculations for gutter channels now match the gutter calculations performed for Inlets.
• The following issues related to Inlet calculations and reporting have been resolved:
  • Gutter depression values can now be set to zero.
  • Manning roughness n-value default for gutter sections has been set to 0.016 for Inlet calculations.
• The following issues related to Culvert calculations and reporting have been resolved:
  • Culvert calculations clarified to match HDS-5 requirements.
  • The Manning roughness n-value list for Culverts now includes values up to 0.035 to match HDS-5.
  • Circular culverts now report consistent tailwater results as expected across a flow range.
  • Box culverts under outlet control now report expected headwater values.
  • Horizontal elliptical pipes now report expected headwater values.
  • Elliptical Culvert calculations now report expected headwater values above the crown of the pipe.

Hydraflow Hydrographs

• Resizing column widths no longer revert to original size.
• Correct dates are now printed in report data.
• Hydrograph plots are now displayed correctly on computers running Windows XP 32-bit.

Inquiry

• Switching between drawings with the Profile View inquiry, elevation & grade between two points command active no longer causes the application to close unexpectedly.

Intersection

• An issue with Offset Profiles that resulted in unexpected results when creating an intersection has been resolved.

Labels

• An issue where referenced Pipe Spanning labels list the incorrect distance after reopening a drawing has been resolved.
• Cogo Point labels in drawings from a previous release now retain rotation properties.
• An issue where referenced Pipe Network Labels in section view disappear after reopening a drawing has been resolved.

LandXML

• Importing a Pipe Network with structures deselected no longer causes the application to close unexpectedly.

Lines and Curves

• The Deflection-Distance transparent command now supports angles less the zero.

Parcels

• An error when creating a parcel using the Slide Line Create command has been resolved.

Pipe Networks

• Opening drawings with external references no longer causes the application to close unexpectedly.
• Selecting a pipe part while creating a Profile View no longer causes the application to close unexpectedly.
• Creating a Pipe Network while the Panorama is open with a deleted network no longer causes the application to close unexpectedly.
• Solid hatching now displays as expected on curved pipes.
• Solid hatching now displays as expected in Profile Views.
• Synchronizing a Pipe Network with a part swapped in the source drawing now changes updates the style as expected.
• Setting a template with custom optional Pipe Network parameters as the default template no longer returns an error message.
• Displaying large numbers of Pipe Network parts in Prospector is no longer causing slow performance issues.
• Issues recognizing the correct Manning roughness n-value for parts has been resolved.
• Issues setting and retaining a structure's On Grade / On Sag setting have been resolved.
• Pipe length data is now available in structure tables displaying connected pipes.

Plans Production

• An issue where superimposed profiles are not transferred to view frames in a referenced drawing has been resolved.

Points

• Moving a Point using Osnaps now changes the point elevation.
• Assigning user-defined properties to a Point Group from the summary tab no longer results in the application closing unexpectedly.

Profile View

• Dragging a Profile Label to the end of a Split Profile View using Osnap no longer results in the application closing unexpectedly.

Profiles

• Offset Profile geometry has been updated to provide better results when sampling and labeling.

Project Management

• Drawings with circular dependencies now generate a prompt when being checked in.

Quantity Takeoff

• A calculation error when using formulas has been corrected.
• Alignments can now be assigned as a pay item.
• The Pay Item and Pay Item Categorization files now default to the previously browsed path.

Shortcuts

• Performance when opening a drawing containing references has been improved.

Surface

• The Drape Image command no longer results in a reversed image when hardware acceleration is enabled.
• Creating a surface mask while in wireframe view style no longer results in the application closing unexpectedly.
• The accuracy when calculating surface volumes has been improved.
• An issue where adding a 3D polyline as a surface breakline causes the application closing unexpectedly has been resolved.
• Watershed analysis calculations are now launched when the Run Analysis button is selected.

Survey

• Transformation Settings no longer change when migrating a previous release drawing.

The following issues have been resolved in AutoCAD Civil 3D 2012 Service Pack 2.1:

General/Other

• Drawing stability when closing drawings containing data references has been improved.
• An issue where alignments do not plot according to the STB plot style has been resolved.

Hydraflow Storm Sewers

• An issue where running a default analysis with design mode in Hydraflow Storm Sewers causes the application to close unexpectedly has been resolved.

Hydraflow Hydrographs

• The Hydrograph Types tab now displays the full list of hydrographs.

Pipe Networks

• Referenced network section view labels for pipes and structures are no longer lost when exiting the application and reopening the drawing.
• Referenced pipe network styles retain changes as expected when the drawing is saved and re-open