TableCells.InsertAsync(Int32, Boolean, CancellationToken) Method

Inserts a cell to the right or left of the specified cell.

Namespace: DevExpress.Blazor.RichEdit

Assembly: DevExpress.Blazor.RichEdit.v25.1.dll

NuGet Package: DevExpress.Blazor.RichEdit

Declaration

public ValueTask<TableCell> InsertAsync(
    int baseCellIndex,
    bool toRight = false,
    CancellationToken cancellationToken = default(CancellationToken)
)

Parameters

Name	Type	Description
baseCellIndex	Int32	The index of the cell relative to which to insert a cell.

Optional Parameters

Name	Type	Default	Description
toRight	Boolean	False	true to insert a cell to the right of the specified cell; false to insert a cell to the left of the specified cell.
cancellationToken	CancellationToken	null	An object that propagates a cancellation notification.

Returns

Type	Description
ValueTask<TableCell>	A structure that stores an awaitable result of an asynchronous operation. The awaitable result is a new cell.

Remarks

A table consists of cells combined into rows. The Rows property stores all table rows. A row stores its cells in the Cells property. Call the InsertAsync/RemoveAsync method to add/remove a cell to/from the row. Perform this action for each table row to add or remove a table column.

Note

The newly created cell copies appearance settings from the cell whose index you passed as the baseCellIndex parameter.

The following example adds two columns to a table:

<DxRichEdit @ref="richEdit" />

@code {
    DxRichEdit richEdit;
    protected override async Task OnAfterRenderAsync(bool firstRender) {
        if (firstRender)
            try {
                await InitializeDocument();
            }
            catch (TaskCanceledException) { }
        await base.OnAfterRenderAsync(firstRender);
    }

    async Task InitializeDocument() {
    /* Surround the code that contains an asynchronous operation with a try-catch block to handle
    the OperationCanceledException. This exception is thrown when an asynchronous operation is canceled. */
        try {
            var columnCount = 4;
            var rowCount = 5;
            richEdit.DocumentAPI.BeginUpdate();
            // Creates a table
            Table firstTable = await richEdit.DocumentAPI.Tables.CreateAsync(0, columnCount, rowCount);
            for (int i = rowCount-1; i >=0 ; i--)
                for (int j = columnCount-1; j >=0 ; j--) {
                    var cellPosition = firstTable.Rows[i].Cells[j].Interval.Start;
                    await richEdit.DocumentAPI.AddTextAsync(cellPosition, "sample text");
                }
            foreach (TableRow row in firstTable.Rows) {
                // Inserts a cell to the left of the first cell
                await row.Cells.InsertAsync(0);
                // Inserts a cell to the right of the last cell
                await row.Cells.InsertAsync(row.Cells.Count - 1, true); 
            }
            richEdit.DocumentAPI.EndUpdate();
        }
        catch (OperationCanceledException e) {
            Console.WriteLine($"{nameof(OperationCanceledException)} thrown with message: {e.Message}");
        }
    }
}