// can not use generic, at it will emit error
// Compiler Error CS0310
// The type 'typename' must have a public parameterless constructor in order to use it as parameter 'parameter' in the generic type or method 'generic'
internal sealed override OpenXmlPart NewPart(string relationshipType, string contentType)
{
ThrowIfObjectDisposed();
if (contentType == null)
{
throw new ArgumentNullException(nameof(contentType));
}
if (PartConstraints.TryGetValue(relationshipType, out var partConstraintRule))
{
if (!partConstraintRule.MaxOccursGreatThanOne)
{
if (GetSubPart(relationshipType) != null)
{
// already have one, can not add new one.
throw new InvalidOperationException(ExceptionMessages.OnlyOnePartAllowed);
}
}
OpenXmlPart child = CreateOpenXmlPart(relationshipType);
child.CreateInternal(OpenXmlPackage, this, contentType, null);
// add it and get the id
string relationshipId = AttachChild(child);
ChildrenParts.Add(relationshipId, child);
return(child);
}
throw new ArgumentOutOfRangeException(nameof(relationshipType));
}
/// <summary>
/// Init a new created part
/// </summary>
/// <typeparam name="T">The type of the part, must be derived from OpenXmlPart.</typeparam>
/// <param name="newPart">The part to be initialized.</param>
/// <param name="contentType">The content type of the part.</param>
/// <param name="id">The relationship id.</param>
internal override void InitPart <T>(T newPart, string contentType, string id)
{
ThrowIfObjectDisposed();
if (contentType == null)
{
throw new ArgumentNullException(nameof(contentType));
}
if (contentType.Length == 0)
{
throw new ArgumentException(ExceptionMessages.StringArgumentEmptyException, nameof(contentType));
}
newPart.CreateInternal(InternalOpenXmlPackage, ThisOpenXmlPart, contentType, null);
string relationshipId = AttachChild(newPart, id);
ChildrenParts.Add(relationshipId, newPart);
return;
}