These assemblies are not in the full trust assemblylist by default.
默认情况下，完全信任程序集列表中不包含这些程序集。
2
Putting an assembly into the fully trusted assemblylist gives full trust to the assembly only at that level.
将程序集放入完全受信任的程序集列表后，程序集只有在该级别上才具有完全信任。
3
The XAML schema context is also responsible for maintaining the assemblylist of loaded assemblies, which defines where a XAML parser looks for backing types.