This is the source code for this blog entry about unloading assemblies in .NET.
This console app loads, calls, and unloads assemblies in an AssemblyLoadContext. The following commands are available in Program.cs.
| Key | Action |
|---|---|
| a | Load libA library, built separately, into a context |
| b | Load libB library, built separately, into a context |
| c | Call Message() on all loaded assemblies |
| d | Dump info about the contexts |
| g | Call garbage collector |
| p | Call Value() with 1-50 and plot results for all loaded assemblies |
| e | Enter an equation to dynamically build and loaded assembly |
| x | Build and load 1 assembly |
| y | Build and load 100 assemblies |
| z | Build and load 1000 assemblies |
| u | Unload all assemblies |
| q | Quit |
For most of the commands, if you enter the capital letter it will use a "Test" load context. So there can be up to three contexts: Default and two created by the test app.
For e you are prompted for a simple math expression. System.Math methods are available without a prefix (e.g. Sin(d)). The expression is then used to pass to Rosyln to build and load the assembly on-the-fly. As a fun little exercise, pressing p plots them using Ascii Chart C#.
>>>> Chart for Sin(d/4)
1.00 ┤ ╭───╮ ╭───╮
0.80 ┤ ╭╯ ╰╮ ╭╯ ╰╮
0.60 ┤ ╭╯ ╰╮ ╭╯ ╰╮
0.40 ┤ ╭╯ ╰╮ ╭╯ ╰╮
0.20 ┤╭╯ ╰╮ ╭╯ ╰╮
-0.00 ┼╯ │ ╭╯ ╰╮
-0.20 ┤ ╰╮ ╭╯ │
-0.40 ┤ ╰╮ │ ╰╮ ╭
-0.60 ┤ ╰╮ ╭╯ ╰╮ ╭╯
-0.80 ┤ ╰─╮ ╭─╯ ╰─╮ ╭─╯
-1.00 ┤ ╰──╯ ╰──╯
>>>> Chart for Cos(d/4)
1.00 ┼─╮ ╭──╮ ╭
0.80 ┤ ╰─╮ ╭─╯ ╰─╮ ╭╯
0.60 ┤ ╰╮ ╭╯ ╰╮ ╭╯
0.40 ┤ ╰╮ │ ╰╮ ╭╯
0.20 ┤ │ ╭╯ ╰╮ ╭╯
0.00 ┤ ╰╮ ╭╯ │ ╭╯
-0.20 ┤ ╰╮ ╭╯ ╰╮ ╭╯
-0.40 ┤ ╰╮ ╭╯ ╰╮ ╭╯
-0.60 ┤ ╰╮ ╭╯ ╰╮ ╭╯
-0.80 ┤ ╰╮ ╭╯ ╰╮ ╭╯
-1.00 ┤ ╰───╯ ╰───╯
>>>> Chart for d*d
2401.00 ┤ ╭─
2160.90 ┤ ╭─╯
1920.80 ┤ ╭──╯
1680.70 ┤ ╭──╯
1440.60 ┤ ╭──╯
1200.50 ┤ ╭───╯
960.40 ┤ ╭───╯
720.30 ┤ ╭───╯
480.20 ┤ ╭─────╯
240.10 ┤ ╭───────╯
0.00 ┼──────────╯
- MS Doc: AssemblyLoadContext Class
- MS Doc: How to use and debug assembly unloadability in .NET Core
- MS Doc: Understanding System.Runtime.Loader.AssemblyLoadContext
- Exploring the new Assembly unloading feature in .NET Core 3.0 by building a simple plugin system running on ASP.NET Core Blazor by Steve Knox
- Ascii Chart C#