initial commit

Data/CategoryTreeData.cs

@@ -0,0 +1,54 @@
+using Microsoft.Data.SqlClient;
+
+namespace Library;
+
+public class CategoryTreeData
+{
+	private readonly List<CategoryItemData> m_RootElements = new( );
+	public List<CategoryItemData> RootElements { get => m_RootElements; }
+
+	private readonly Dictionary<int,CategoryItemData> m_AllElements = new( );
+
+	public int GetRootID( )
+	{
+		if ( m_RootElements.Count == 0 )
+			return 0;
+		return m_RootElements[0].ID;
+	}
+
+	public CategoryItemData? FindCategory( int id )
+	{
+		if ( m_AllElements.TryGetValue( id , out CategoryItemData? value ) )
+			return value;
+		return null;
+	}
+
+	public void LoadCategoryTree( SqlConnection connection )
+	{
+		using SqlDataReader reader = new SQLBuilder( connection , "select id,idfat,label,ime_x,cnt,lis_txt from [select_razdeli]" )
+			.ExecuteReader( );
+
+		while ( reader.Read( ) )
+		{
+			CategoryItemData model = new( )
+			{
+				ID = reader.Int( "id" ) ,
+				ParentID = reader.Int( "idfat" ) ,
+				ElementCount = reader.Int( "cnt" ) ,
+				Depth = reader.Int( "label" ) ,
+				Name = reader.StringSafe( "ime_x" ).Trim( ),
+				Catego_opis = reader.StringSafe( "lis_txt" ).Trim( )
+			};
+			m_AllElements[model.ID] = model;
+		}
+
+		foreach ( CategoryItemData m in m_AllElements.Values )
+		{
+			if ( m_AllElements.TryGetValue( m.ParentID , out CategoryItemData? parent ) )
+				parent.Children.Add( m );
+			else
+				m_RootElements.Add( m );
+		}
+	}
+
+}