> For the complete documentation index, see [llms.txt](https://techbrunch.gitbook.io/workspace/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://techbrunch.gitbook.io/workspace/mobile/xamarin.md).

# Xamarin

### Reverse

Extract the DLLs then use ILSpy:

#### Step 1:

* Mac) Install Visual Studio for Mac (<http://visualstudio.microsoft.com/vs/mac/>). It has MonoDevelop, all .NET tools, a full IDE, etc...
* Windows) Install Visual Studio or any other way to get the "dotnet" command line tool.
* Linux) Get the "dotnet" command line tool.

#### Step 2:

Go to a Terminal prompt and type `dotnet tool install ilspycmd -g` to install the official ilspy command line version.

Global tools are installed in the following directories by default when you specify the `-g` or `--global` option:

| OS          | Path                          |
| ----------- | ----------------------------- |
| Linux/macOS | `$HOME/.dotnet/tools`         |
| Windows     | `%USERPROFILE%\.dotnet\tools` |

#### Step 3:

Read usage instructions here: <https://github.com/icsharpcode/ILSpy/tree/master/ICSharpCode.Decompiler.Console>. It is very simple. Most of the time you just run it with `ilspycmd -p -o <folder> <dll file>` to decompile to an output folder and make a buildable project file (that is what `-p` does).

Source: <https://github.com/aerror2/ILSpy-For-MacOSX/issues/6>

{% embed url="<https://www.x41-dsec.de/security/news/working/research/2020/09/22/xamarin-dll-decompression/>" %}