FlexGrid allows you to merge cells with same values, making them span multiple rows or columns. This capability is useful for enhancing appearance and clarity of data displayed in the grid. The effect of these settings is similar to the HTML <ROWSPAN> and <COLSPAN> tags.

Cell merging has several possible uses. For example, you can use it to create merged table headers, merged data views, or grids where the text spills into adjacent columns. This section discusses these scenarios in the topics below.

Auto-Merge

FlexGrid lets you enable automatic cell merging in the grid by setting the AllowMerging property to a value other than None. The merging is done automatically based on the cell contents. This feature makes it easy to provide merged views of sorted data, where values in adjacent rows present repeated data.

Free Auto-merge

Free auto-merge refers to merging of cells with just one pre-condition of having same values in adjacent cells. To automatically merge the cells in a row or a column, you simply need to set AllowMerging property of the FlexGrid class to All. This property takes values from the GridAllowMerging enumeration.

Below code shows how to apply free merging on a WinUI FlexGrid column.

// Free 自動マージ
// 許可されるマージの種類を指定します
flexGrid1.AllowMerging = GridAllowMerging.All;

Merge Table Headers

Merging the header cells, specially in case of multi-row header is another very common scenario used in grids and tables. To merge the header cells, you must set the AllowMerging property to AllHeaders.

Following code demonstrates how to apply merging only on table headers of the WinUI FlexGrid.

// テーブルのヘッダをマージします
flexGrid1.AllowMerging = GridAllowMerging.AllHeaders;