NDepend find unused controls in ASP.NET WebForms site

There is no build in tools in Visual Studio to find unused controls in ASP.NET WebForms site, but there is great third party tool called ndepend.

At this moment ndepend does not support analyzing of webforms sites but there is one way to perform one.

All you need to do is publish you site to local folder with precompiling all controls all other settings can be leaved with default options.

Precompile

Now you can use ndepend to analyze assemblies in directory rather than analyzing Visual Studio solution

Notice: If you will get circular reference errors or something like this, try tune precompilation settings like this:

Precompile settings

It helped me a lot at least to get my project to be compiled

And now here is pretty part - ndepend is awesome! it can not only show you 100500 things you event do not know about, but run custom queries over your code

Just look what it can do in response to folloging query:

Application.Types.Where(t => t.IsClass && !t.IsGeneratedByCompiler && t.Name.Contains("ascx") && !t.Name.StartsWith("FastObjectFactory")).Select(t => new {
    t,
    childs = t.TypesUsed.Where(p => t.IsClass && !t.IsGeneratedByCompiler && t.Name.Contains("ascx") && !p.Name.StartsWith("FastObjectFactory")),
    parents = t.TypesUsingMe.Where(p => t.IsClass && !t.IsGeneratedByCompiler && !p.Name.StartsWith("FastObjectFactory"))
})

WebForms Controls Usage

WebForms Controls Usage

At last there is easy way to find unused controls (but still should be carefull if you add controls dynamically to your page)

WebForms Controls Hierarchy Tree

Did you ever tried to explain to your PM that project is way to big, there is so many places changes in which can brake something else?

Here is how can you show them picture: Open “Dependency Graph” and call “Export Query Result to Graph” from menu for such query:

Application.Types.Where(t => t.IsClass && !t.IsGeneratedByCompiler && (t.Name.Contains("ascx") || t.Name.Contains("aspx")) && !t.Name.StartsWith("FastObjectFactory")).Select(t => new {t})

It will look something like this:

WebForms Controls Hierarchy

Full tree 3MB size

NDepend Users Voice

After playing with ndepend created few feature requests, if you are reading this you probably want to do same things as i, so this requests will help you a lot:

Ability to export dependency graph as SVG

Support for Web Sites (WebForms/MVC)

Here is how at this moment I am removing unused controls from project:

from t in Application.Types
let p = t.TypesUsingMe.Where(p => t.IsClass && !t.IsGeneratedByCompiler && !p.Name.StartsWith("FastObjectFactory"))
where p.Count() == 0 && t.IsClass && !t.IsGeneratedByCompiler && t.Name.Contains("ascx") && !t.Name.StartsWith("FastObjectFactory") && !t.Name.Contains("cvbuilder_popups")
select new{t,p}

Find unused methods insibe WebForms Controls

from m in Application.Methods
where

   m.NbMethodsCallingMe == 0
&& m.ParentAssembly.Name.Contains("ascx")
&& !m.IsGeneratedByCompiler
&& !m.IsConstructor
&& !m.ParentType.Name.Contains("FastObjectFactory")
&& !m.IsExplicitInterfaceImpl
&& !m.IsClassConstructor
&& !m.IsVirtual

//TODO: events?
&& !m.IsEventAdder
&& !m.IsEventRemover

&& !m.ParentType.IsDelegate

&& !m.Name.StartsWithAny("Page_", "zz")

&& !m.IsPropertyGetter
&& !m.IsPropertySetter

select new { m, m.NbMethodsCallingMe }

Find unsued fields inside WebFroms Controls

from f in Application.Fields
where f.NbMethodsUsingMe == 0 && f.ParentAssembly.Name.Contains("ascx")
select new { f, f.NbMethodsUsingMe }