/// <summary>
/// Gets the value of the specified property of the specified item if the hierarchy supports it, or returns a HRESULT if there was an error.
/// </summary>
public static int GetProperty <T>(this IVsHierarchy hierarchy, HierarchyId item, VsHierarchyPropID property, T defaultValue, out T result)
{
Requires.NotNull(hierarchy, nameof(hierarchy));
if (item.IsNilOrEmpty || item.IsSelection)
{
throw new ArgumentException(null, nameof(item));
}
HResult hr = hierarchy.GetProperty(item, (int)property, out object resultObject);
if (hr.IsOK)
{
// NOTE: We consider it a bug in the underlying project system or the caller if this cast fails
result = (T)resultObject;
return(HResult.OK);
}
if (hr == VSConstants.DISP_E_MEMBERNOTFOUND)
{
result = defaultValue;
return(HResult.OK);
}
result = default(T);
return(hr);
}
/// <summary>
/// Gets the value of the specified property of the specified item if the hierarchy supports it, or throws an exception if there was an error.
/// </summary>
public static T GetProperty <T>(this IVsHierarchy hierarchy, HierarchyId item, VsHierarchyPropID property, T defaultValue = default(T))
{
HResult hr = GetProperty(hierarchy, item, property, defaultValue, out T result);
if (hr.Failed)
{
throw hr.Exception;
}
return(result);
}
