I know of the error "The accessibility modifier of the set accessor must be more restrictive than the property or indexer". I also know the solution. Just not in this very specific case.
Consider this example:
internal virtual bool IsFocused
{
get
{
return isFocused;
}
protected set
{
isFocused = value;
}
}
private bool isFocused;
It shows the error. I just don't know why. How is "protected" not less accessible than internal? What would be the solution to this problem? I tried putting "internal protected" instead, without luck.
protected
allows an inherting class to access it while internal
does NOT - internal
restricts access to the assembly itself - see http://msdn.microsoft.com/en-us/library/7c5ka91b%28v=vs.80%29.aspx
As it turns out, protected
is more accessible than internal
. Recall that internal
means "not visible outside of this assembly" (except through InternalsVisibleTo
access, which makes internal
look like public
), whereas protected
means visible to all subclasses.
@bobbymcr is entirely right in his analysis. The solution would be to mark property as internal protected
. In C# that means that it would be accessible both to derived classes AND to all classes from current assembly.
If you put internal protected
to accessor method - that means that it is accessible to derived classes. But entire property is not, which causes the error. If you mark entire property as internal protected
and accessor method as protected
- everything is fine.
internal protected virtual bool IsFocused
{
get
{
return isFocused;
}
protected set
{
isFocused = value;
}
}
private bool isFocused;
Other option would be to introduce protected
method that would be called in setter. Then you could mark entire property as internal
and allow to override only that method.