//构建文件种类树
public List <CatalogTreeNode> BuildCatTree()
{
List <CatalogTreeNode> nodes = new List <CatalogTreeNode>();
FileCatalogs fcs = new FileCatalogs();
DbSet <File_Catalog> ta = fcs.GetCatalogsSet();
var roots = ta.Where(s => s.parent_Catalog == null).ToList();
foreach (var root in roots)
{
nodes.Add(BuildCatNodes(root));
}
return(nodes);
}
