IL2072: 'target parameter' argument does not satisfy 'DynamicallyAccessedMembersAttribute' in call to 'target method'. The return value of method 'source method' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to

Cause

The target location declares some requirements on the type value via its DynamicallyAccessedMembersAttribute. Those requirements must be declared by the source value also via the DynamicallyAccessedMembersAttribute. The source value can declare more requirements than the target, if necessary.

Example

Type GetCustomType() { return typeof(CustomType); }

void NeedsPublicConstructors([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] Type type)
{
    // ...
}

void TestMethod()
{
    // IL2072 Trim analysis: 'type' argument does not satisfy 'DynamicallyAccessedMembersAttribute' in call to 'NeedsPublicConstructors'. The return value of method 'GetCustomType' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.
    NeedsPublicConstructors(GetCustomType());
}

Fixing

See Fixing Warnings for guidance.