DataGrid - the lines separating the columns disappear.

Hello,

Please refer to the attached images in Word document.

We find that the lines separating the columns disappear as we add rows to the datagrid. This happens at the point when enough rows have been added to trigger the horizontal scroll bars. (We allow the user to add rows to the datagrid.)

We create the columns for the datagrid in code and set their width.

public void SetColumnFillWidth(DataGridColumn column, double columnWidth, GridUnitType unitType)

    {

        if( column == null )
        {
            return;
        }
        if (columnWidth <= 0)
        {
            columnWidth = 100;
        }

        if (this.ColumnAutoSizing)
        {
            column.Width = new GridLength(columnWidth, unitType);
        }
        else
        {
            column.Width = new GridLength(columnWidth);
        }
    }

If we use ColumnAutoSizing == true then unitType = GridUnitType.Star.

We noticed that when setting all the columns to AutoSizing (i.e. unitType = GridUnitType.Star) then the we find that the problem appears.

However if we do NOT have AutoSizing then the column width is set to a specific value and the problem does not occur.

How can we avoid this issue?

Thanks Oscar

Hi Oscar,

Thanks for the details here. I was able to reproduce this and have made a fix for the next nightly build that you can try out. Let me know how it goes.

-Jason Fauchelle

Hi Jason,

Thank you very much.

The issue seems to be fixed.

...Oscar