Map dependencies across your solutions

When you want to understand dependencies across your code, visualize them by creating code maps. This helps you see how the code fits together without reading through files and lines of code.

Here are some videos:

• Understand your code dependencies through visualization

• Visualize the impact of a change

• Understanding complex code with code maps

Get started with code maps

To use code maps you’ll need either:

• Visual Studio Enterprise: Create code maps from the code editor, Solution Explorer, Class View, or Object Browser.

• Visual Studio Professional: Open code maps, make limited edits, and navigate code.

You can map dependencies for code in these languages:

• Visual C# .NET or Visual Basic .NET in a solution or assemblies (.dll or .exe)

• Native or managed C or C++ code in Visual C++ projects, header files (.h or #include), or binaries

• X++ projects and assemblies made from .NET modules for Microsoft Dynamics AX

  Note: For projects other than C# or Visual Basic .NET, there are fewer options for starting a code map or adding items to an existing code map. For example, you cannot right-click an object in the text editor of a C++ project and add it to a code map. However, you can drag and drop individual code elements or files from Solution Explorer, Class View, and Object Browser.

To see the overall dependencies across your solution

1. Open the Architecture menu.

2. If you just opened the solution and haven’t yet built it, or if your code has changed since the last time you built it, choose Generate Code Map for Solution.

3. If your code hasn't changed since the last time you built it, choose Generate Code Map for Solution Without Building to get faster performance when creating the map.

4. See overall dependencies to understand how you can use code maps to view the overall dependencies across your solution.

To see specific dependencies within your solution

1. With your solution loaded, open Solution Explorer.

2. Select all the projects, assembly references, folders, files, types, or members that you want to map.

3. On the Solution Explorer toolbar, choose Show on Code Map. Or open the shortcut menu and choose Show on Code Map. You can also drag items from Class View or Object Browser into a new or an existing code map.

4. See specific dependencies to understand how you can use code maps to view specific dependencies within your solution.

To add a new empty code map to your solution

1. In Solution Explorer, open the shortcut menu for your top-level solution node. Choose Add then choose New Item.

2. Under Installed, choose General.

3. In the right pane, choose Directed Graph Document and then choose Add.

   You now have a blank map, which appears in your solution's Solution Items folder.

To create a new empty code map without adding it to your solution

1. Open the Architecture menu and choose New Code Map.

   - or -

2. Open the File menu and choose New then choose File.

3. Under Installed, choose General.

4. In the right pane, choose Directed Graph Document and then choose Open.

   You now have a blank map, which does not appear in your solution's folders.

See overall dependencies

See dependencies across your solution

1. On the Architecture menu, choose Generate Code Map for Solution.

   

   You get a map that shows the top-level assemblies and aggregated links between them. The wider the aggregate link, the more dependencies it represents.

2. Use the Legend button on the code map toolbar to show or hide the list of project type icons (such as Test, Web, and Phone Project), code items (such as Classes, Methods, and Properties), and relation types (such as Inherits From, Implements, and Calls).

   

   This example solution contains Solution Folders (Tests and Components), Test Projects, Web Projects, and assemblies. By default, all containment relationships appear as groups, which you can expand and collapse. The Externals group contains anything outside your solution, including platform dependencies. External assemblies show only those items that are used. By default, system base types are hidden on the map to reduce clutter.

3. To drill down into the map, expand the groups that represent projects and assemblies. You can expand everything by pressing CTRL+A to select all the nodes and then choosing Group, Expand from the shortcut menu.

   

4. However, this may not be useful for a large solution. In fact, for complex solutions, memory limitations may prevent you from expanding all the groups. Instead, to see inside an individual node, expand it. Move your mouse pointer on top of the node and then click the chevron (down arrow) when it appears.

   

   Or use the keyboard by selecting the item then pressing the plus key (+). To explore deeper levels of code, do the same for namespaces, types, and members.

   Tip

   For more details of working with code maps using the mouse, keyboard, and touch, see Browse and rearrange code maps.

5. To simplify the map and focus on individual parts, choose Filters on the code map toolbar and select just the types of nodes and links you are interested in. For example, you can hide all the Solution Folder and Assembly containers.

   

   You can also simplify the map by hiding or removing individual groups and items from the map, without affecting the underlying solution code.

6. To see the relationships between items, select them in the map. The colors of the links indicate the types of relationship, as shown in the Legend pane.

   

   In this example, the purple links are calls, the dotted links are references, and the light blue links are field access. Green links can be inheritance, or they may be aggregate links that indicate more than one type of relationship (or category).

   Tip

   If you see a green link, it might not mean there's just an inheritance relationship. There might also be method calls, but these are hidden by the inheritance relationship. To see specific types of links, use the checkboxes in the Filters pane to hide the types you aren’t interested in.

7. To get more information about an item or link, move the pointer on top of it until a tooltip appears. This shows details of a code element or the categories that a link represents.

   

8. To examine items and dependencies represented by an aggregate link, first select the link and then open its shortcut menu. Choose Show Contributing Links (or Show Contributing Links on New Code Map). This expands the groups at both ends of the link and shows only those items and dependencies that participate in the link.

9. To focus in on specific parts of the map, you can continue to remove items you aren’t interested in. For example, to drill into class and member view, simply filter all the namespace nodes in the Filters pane.

   

10. Another way to focus in on a complex solution map is to generate a new map containing selected items from an existing map. Hold CTRL while selecting the items you want to focus on, open the shortcut menu, and choose New Graph from Selection.

    

11. The containing context is carried over to the new map. Hide Solution Folders and any other containers you don’t want to see using the Filters pane.

    

12. Expand the groups and select items in the map to view the relationships.

    

    See also:

• Browse and rearrange code maps

• Customize code maps by editing the DGML files

• Find potential problems in your code by running an analyzer.

See dependencies across assemblies or binaries

1. Create an empty code map, or open an existing code map (.dgml file).

2. Drag the assemblies or binaries you want to map from outside Visual Studio onto the map. For example, drag assemblies or binaries from Windows Explorer or File Explorer.

See specific dependencies

For example, suppose you have a code review to perform in some files with pending changes. To see the dependencies in those changes, you can create a code map from those files.

See specific dependencies in your solution

1. Open Solution Explorer. Select the projects, assembly references, folders, files, types, and members that interest you. To find items that have dependencies on types or members, open the type or member's shortcut menu from Solution Explorer. Choose the dependency type, and then select the results.

2. Map your items and their members. On the Solution Explorer toolbar click Show on Code Map.

   

3. The map shows the selected items within their containing assemblies.

   

   You can also drag items from Solution Explorer, Class View, or Object Browser to a blank or an existing code map. To create a blank map, see Create an empty code map. To include the parent hierarchy for your items, press and hold the CTRL key while you drag items, or use the Include Parents button on the code map toolbar to specify the default action.

   Note

   When you add items from a project that's shared across multiple apps, like Windows Phone or Windows Store, those items appear on the map with the currently active app project. If you change context to another app project and add more items from the shared project, those items now appear with the newly active app project. Operations that you perform with an item on the map apply only to those items that share the same context.

4. To explore items, expand them. Move the mouse pointer on top of an item, then click the chevron (down arrow) icon when it appears.

   

   To expand all items, select them using CTRL+A, then open the shortcut menu for the map and choose Group, Expand. However, this option isn't available if expanding all groups creates an unusable map or memory issues.

5. Continue to expand items you are interested in, right down to the class and member level if required.

   

   To see members that are in the code but don't appear on the map, click the Refetch Children icon in the top left corner of a group.

6. To see more items related to those on the map, select one and choose Show Related on the code map toolbar, then select the type of related items to add to the map. Alternatively, select one or more items, open the shortcut menu, and then choose the Show… option for the type of related items to add to the map. For example:

   For an assembly, choose:

   Option	Description
   Show Assemblies This References	Add assemblies that this assembly references. External assemblies appear in the Externals group.
   Show Assemblies Referencing This	Add assemblies in the solution that reference this assembly.

   For a namespace, choose Show Containing Assembly, if it's not visible.

   For a class or interface, choose:

   Option	Description
   Show Base Types	For a class, add the base class and the implemented interfaces. For an interface, add the base interfaces.
   Show Derived Types	For a class, add the derived classes. For an interface, add the derived interfaces and the implementing classes or structs.
   Show Types This References	Add all classes and their members that this class uses.
   Show Types Referencing This	Add all classes and their members that use this class.
   Show Containing Namespace	Add the parent namespace.
   Show Containing Namespace and Assembly	Add the parent container hierarchy.
   Show All Base Types	Add the base class or interface hierarchy recursively.
   Show All Derived Types	For a class, add all the derived classes recursively. For an interface, add all the derived interfaces and implementing classes or structs recursively.

   For a method, choose:

   Option	Description
   Show Methods This Calls	Add methods that this method calls.
   Show Fields This References	Add fields that this method references.
   Show Containing Type	Add the parent type.
   Show Containing Type, Namespace, and Assembly	Add the parent container hierarchy.
   Show Overridden Methods	For a method that overrides other methods or implements an interface's method, add all the abstract or virtual methods in base classes that are overridden and, if any, the interface's method that is implemented.

   For a field or property, choose:

   Option	Description
   Show Containing Type	Add the parent type.
   Show Containing Type, Namespace, and Assembly	Add the parent container hierarchy.

   

7. The map shows the relationships. In this example, the methods called by the Find method, and their location in the solution or externally.

   

8. To simplify the map and focus on individual parts, choose Filters on the code map toolbar and select just the types of nodes and links you are interested in. For example, turn off display of Solution Folders, Assemblies, and Namespaces.

   

See dependencies between C and C++ source files and header files

If you want to create more complete maps for C++ projects, set the browse information compiler option (/FR) on those projects. See /FR, /Fr (Create .Sbr File). Otherwise, a message appears and prompts you to set this option. If you select OK, this sets the option for just the current map. You can choose to hide the message for all later maps. If you hide this message, you can make it appear again. Set the following registry key to 0 or delete the key:

HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\14.0\NativeProvider : AutoEnableSbr

When you open a solution that contains Visual C++ projects, it might take some time to update the IntelliSense database. During this time, you might not be able to create code maps for header (.h or #include) files until the IntelliSense database finishes updating. You can monitor the update progress in the Visual Studio status bar. To resolve issues or messages that appear because certain IntelliSense settings are disabled, see Troubleshoot maps for C and C++ code.

• To see dependencies between all source files and header files in your solution, on the Architecture menu, choose Generate Graph of Include Files.

  

• To see dependencies between the currently open file and related source files and header files, open either the source file or the header file. Open the file shortcut menu anywhere inside the file. Choose Generate Graph of Include Files.

  

Troubleshoot maps for C and C++ code

These items aren't supported for C and C++ code:

• Base types don't appear on maps that include the parent hierarchy.

• Most Show menu items aren't available for C and C++ code.

  These issues might happen when you create code maps for C and C++ code:

Make code maps render more quickly

When you generate a map for the first time, Visual Studio indexes all the dependencies that it finds. This process might take some time, especially for large solutions, but will improve performance later. If your code changes, Visual Studio re-indexes just the updated code. To minimize the time taken for the map to finish rendering, consider the following:

• Map only the dependencies that interest you.

• Before you generate the map for an entire solution, reduce the solution scope.

• Turn off automatic build for the solution with the Skip Build button on the code map toolbar.

• Turn off automatic adding of parent items with the Include Parents button on the code map toolbar.

• Edit the code map file directly to remove nodes and links you don't need. Changing the map doesn't affect the underlying code. See Customize code maps by editing the DGML files.

  

  Although Visual Studio can run with 1 GB of memory, we recommended that your computer have at least 2 GB of memory to avoid long delays while Visual Studio creates the code index and generates the map.

  It might take more time to create maps or add items to a map from Solution Explorer when a project item's Copy to Output Directory property is set to Copy Always. This might cause issues with incremental builds and Visual Studio to rebuild the project each time. To increase performance, change this property to Copy if newer or PreserveNewest. See Incremental Builds.

  The completed map will show dependencies only for successfully-built code. If build errors occur for certain components, these errors appear on the map. Make sure that a component actually builds and has dependencies on it before you make architectural decisions based on the map.

Share code maps

Share the map with other Visual Studio users

Use the File menu to save the map.

-or-

To save the map as part of specific project, on the map toolbar, choose Share, Move <CodeMapName>.dgml into, and then choose the project where you want to save the map.

Visual Studio saves the map as a .dgml file that you can share with other users of Visual Studio Enterprise and Visual Studio Professional.

Export the map as an image so you can copy it into other applications, such as Microsoft Word or PowerPoint

1. On the code map toolbar, choose Share, Email as Image or Copy Image.

2. Paste the image into another application.

Export the map as an XPS file so you can see it in XML or XAML viewers like Internet Explorer

1. On the code map toolbar, choose Share, Email As Portable XPS or Save As Portable XPS.

2. Browse to where you want to save the file.

3. Name the code map. Make sure that the Save as type box is set to XPS files (*.xps). Choose Save.

What else can I do?

• Use code maps to debug your applications

• Map methods on the call stack while debugging

• Find potential problems using code map analyzers

• Browse and rearrange code maps

• Customize code maps by editing the DGML files