Issue using WPF control library with 1.6-preview5
nate_work barish
Govert van Drimmelen
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This is a case where the .NET libraries don’t deal well with the “AssemblyLoadContexts” that were introduced in .NET Core. When the baml content from WPF is compiled at runtime, the assembly resolution goes wrong unless you set up the “Contextual Reflection” context in advance.
To deal with this you need to wrap such critical places like this:
public MyUserControl()
{
_control = new ElementHost();
_control.Location = new System.Drawing.Point(0, 0);
_control.Dock = DockStyle.Fill;
using (var ctx = System.Runtime.Loader.AssemblyLoadContext.EnterContextualReflection(this.GetType().Assembly))
{
var control = new MyWpfControl();
_control.Child = control;
Controls.Add(_control);
}
}
The .NET developers have decided not to change the requirement to insert this magic into your code in places that can trigger some code loading calls at runtime. And you cannot know what code inside another library might require this. This is one way in which .NET 6 provides significantly less isolation than .NET Framework, by design.
More reading here:
runtime/AssemblyLoadContext.ContextualReflection.md at main · dotnet/runtime (github.com)
-Govert
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