datagrid column sort direction

[RayNixon665]

I have created my own custom IComparer class and as part of the custom sorting, I need to pass the columns current SortDirection.

as you can see below. I have worked around, by storing my own sort direction. but it's prone to getting out of sync with the true sort direction.

is there anyway to safely get the columns actually current sort direction?

<MudBlazor.PropertyColumn Property="x => x.ChassisNumber" Title="@ChassisColName" Comparer=" new DgvItemComparer(GetOrSetSortDirection(ChassisColName))" />

public SortDirection ChassisColSortDirection = SortDirection.None;
string ChassisColName = "Chassis";

private SortDirection GetOrSetSortDirection (string ColName)
{
    if (ColName == ChassisColName)
    {
        if (ChassisColSortDirection == SortDirection.None)
        {
            ChassisColSortDirection = SortDirection.Descending;

        }
        else if (ChassisColSortDirection == SortDirection.Ascending)
        {
            ChassisColSortDirection = SortDirection.Descending;

        }
        else if (ChassisColSortDirection == SortDirection.Descending)
        {
            ChassisColSortDirection = SortDirection.Ascending;

        }

    }
              return ChassisColSortDirection;
}

[ScarletKuro]

First you need to add a ref to the datagrid MudDataGrid @ref="_dataGrid"
private MudDataGrid<YourType> _dataGrid = null!;
then you can use this method to extract the sort direction by column name:

    private SortDirection GetColumnSortDirection(string columnName)
    {
        if (columnName == null)
        {
            return SortDirection.None;
        }
        var ok = _dataGrid.SortDefinitions.TryGetValue(columnName, out var sortDefinition);

        if (ok)
        {
            return sortDefinition.Descending ? SortDirection.Descending : SortDirection.Ascending;
        }
        return SortDirection.None;
    }

It's what datagrid using internally.

[RayNixon665]

Awesome mate. That's exactly what I was after.

Cheers.

[holm76]

Is this still an option?

Regarding implementing an EmptyLastComparer I need to get info on the column sort order but the above code is not working for me. For some reason I never get an OK from the TryGetValue. Its like my column doesn't have a name...

[holm76]

The Key property in dataGrid.SortDefinitions is a random GUID even if I do set the Title on PropertyColumn component.

[holm76]

Solved by saving a reference also to the column I which to do this operation on and then use columnRef.PropertyName to get the SortDirection