Dependency Graph in Visual Studio 2010 – View Assembly Dependencies
Posted by: Suprotim Agarwal
in Category Visual Studio
Abstract: In this article, we will see how to explore a .NET assembly using the Dependency Graph Tool in Visual Studio 2010 Ultimate.
The Visual Studio 2010 Ultimate Edition has some excellent Architecture tools for modeling new applications, as well as analyze an existing application. One tool amongst them is the ‘Dependency Graph’.
As quoted in MSDN, Dependency graphs help you learn more about the organization and relationships in existing code. So let us say that you have just joined a new project and the application has no documentation (yes we have all been there!) or you need to move your project from an older version to a newer one and want to use a tool to make sure that there are no references during the upgradation or you simple want to explore an assembly inside out - the Dependency Graph can be very useful in all these scenarios.
In this article, we will start by seeing how to explore an existing .NET assembly using the Dependency Graph tool. In future articles, we will see how to generate dependency graphs for projects, like an ASP.NET project. We will be using the System.Web.Routing.dll for this example. You can find this assembly on your machine if you have .NET 3.5 SP1 or .NET 4.0 installed. Alternatively, you can choose any other assembly of your choice.
Let us get started:
Step 1: Open Visual Studio 2010 > Architecture > New Diagram
Step 2: Choose ‘Directed Graph Document’ from the list of Diagrams and click OK as shown below:
Note: If a Modeling project does not exist, you will be prompted to create one. Give it the name ‘WebRoutingModeling’ and click OK.
You should now see a screen similar to the following:
Step 3: Now drag and drop the System.WebRouting.dll or any other .dll or exe of your choice from your Windows Explorer, to the empty area. If you chose the System.WebRouting.dll, you should see a screen similar to the following:
Step 4: You can choose to go as detailed as possible! Right click the System.Web.Routing.dll node > View Content
Note: The graph shows only those dependencies for code that builds successfully!
You will see an Assembly Dependency screenshot similar to the one shown below. Notice the colored Legend to the right, which helps you understand the different components of your dependency graph.
You can drill down into the System.Web.Routing.dll node by clicking on the V-Shaped arrow (a.k.a. Chevrons) as indicated by the red arrow, in the screenshot shown above.
Note: At any point, you can hover your mouse over the arrows connecting each node, and get additional details by clicking the center plus button as shown below:
Clicking the center ‘+’ button, brings up the different members to include in the Dependency Graph. I have selected to see all the options (Assembly, Namespaces, Types and Methods) as shown below:
Step 5: Click on the V-shaped arrow again to see the different Namespaces in this assembly.
Clicking on the V-shaped arrow (as shown above) on the System.Web.Routing namespace, brings up the different Classes, Enums and Interfaces in this Namespace
Note: Do you observe a number to the left of each node. When you see this number on a namespace, it represents the classes, interfaces and enums in each class (System.Web.Routing had 24). Similarly when you see this number on a Class, it represents the number of methods in the class.
Click on the V-shaped arrow on the class to view the methods in the class.
Isn’t this a very useful tool? In this article I have just scratched the surface of what this tool can do. For a person who has just joined a project (especially a Legacy app), this tool can be of immense use to understand the layout of the application or validate the design with the implementation.
One drawback I see is that this tool comes with Visual Studio Ultimate 2010, which is beyond the reach of many developers due to its cost, unless you were lucky and I gave you one for Free ;).
If you want a Dependency Visualizer tool for Visual Studio 2005/ 2008, check the Free DependencyVisualizer from Codeplex. Alternatively if you have a small budget, NDepend is a good alternative too!
This article has been editorially reviewed by Suprotim Agarwal.
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