/// <summary>
/// 根据指定类型<see cref="DbCollectionMemberExpression"/>表达式创建虚拟数据源列表语句片段。
/// </summary>
/// <param name="context">生成上下文。</param>
/// <param name="source">虚拟数据源</param>
/// <returns>查询语句片段。</returns>
public virtual SelectFragment CreateVirtualListForCollectionMember(GenerateContext context, VirtualSourceFragment source)
{
var content = (DbCollectionMemberExpression)source.Expression;
var target = GetSource(context, content.TargetSet.Item);
var container = source.Container;
if (container.IsRecommandLock)
{
container = container.Parent as SelectFragment;
}
var list = new SelectFragment(context, target);
if (content.Metadata.IsComposite)
{
GenerateVirtualCompositeJoinForCollectionMember(context, content, list, true);
}
container.AddSource(list);
GenerateVirtualJoinForCollectionMember(context, source, list, false);
list.RetrievalMembers(content.TargetSet.Item, false);
if (IsSelectFragment(content))
{
context.RegisterTempSource(content.Item, target, delegate()
{
list = InitialSelectFragment(list, content);
});
}
return(list);
}