/// <summary>
/// Removes the specified child.
/// Throws if the child is not currently parented by this object.
/// This is O(1).
/// May be safely called during enumeration of the children.
/// </summary>
/// <remarks>
/// This is actually safe to call during enumeration of children, because it
/// doesn't bother to clear the child's NextSibling (or PreviousSibling) pointers.
/// To determine whether a child is unattached, check whether its parent is null,
/// or whether its NextSibling and PreviousSibling point back at it.
/// DO NOT BREAK THIS VERY USEFUL SAFETY CONTRACT.
/// </remarks>
public void RemoveChild(ProjectElement child)
{
ErrorUtilities.VerifyThrowArgumentNull(child, nameof(child));
ErrorUtilities.VerifyThrowArgument(child.Parent == this, "OM_NodeNotAlreadyParentedByThis");
child.ClearParent();
if (child.PreviousSibling != null)
{
child.PreviousSibling.NextSibling = child.NextSibling;
}
if (child.NextSibling != null)
{
child.NextSibling.PreviousSibling = child.PreviousSibling;
}
if (ReferenceEquals(child, FirstChild))
{
FirstChild = child.NextSibling;
}
if (ReferenceEquals(child, LastChild))
{
LastChild = child.PreviousSibling;
}
RemoveFromXml(child);
Count--;
MarkDirty("Remove element {0}", child.ElementName);
}
/// <summary>
/// Removes the specified child.
/// Throws if the child is not currently parented by this object.
/// This is O(1).
/// May be safely called during enumeration of the children.
/// </summary>
/// <remarks>
/// This is actually safe to call during enumeration of children, because it
/// doesn't bother to clear the child's NextSibling (or PreviousSibling) pointers.
/// To determine whether a child is unattached, check whether its parent is null,
/// or whether its NextSibling and PreviousSibling point back at it.
/// DO NOT BREAK THIS VERY USEFUL SAFETY CONTRACT.
/// </remarks>
public void RemoveChild(ProjectElement child)
{
ErrorUtilities.VerifyThrowArgumentNull(child, "child");
ErrorUtilities.VerifyThrowArgument(child.Parent == this, "OM_NodeNotAlreadyParentedByThis");
child.ClearParent();
if (child.PreviousSibling != null)
{
child.PreviousSibling.NextSibling = child.NextSibling;
}
if (child.NextSibling != null)
{
child.NextSibling.PreviousSibling = child.PreviousSibling;
}
if (Object.ReferenceEquals(child, FirstChild))
{
FirstChild = child.NextSibling;
}
if (Object.ReferenceEquals(child, LastChild))
{
LastChild = child.PreviousSibling;
}
var previousSibling = child.XmlElement.PreviousSibling;
XmlElement.RemoveChild(child.XmlElement);
if (XmlDocument.PreserveWhitespace)
{
// If we are trying to preserve formatting of the file, then also remove any whitespace
// that came before the node we removed.
if (previousSibling != null && previousSibling.NodeType == XmlNodeType.Whitespace)
{
XmlElement.RemoveChild(previousSibling);
}
}
_count--;
MarkDirty("Remove element {0}", child.ElementName);
}