Underlining datagridview column caption

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Andrus - 02 Mar 2008 22:48 GMT

.NET 2 Winforms DataGridView.

I noticed that if column width is small

column.HeaderCell.SortGlyphDirection = ListSortDirection.Ascending;

does not display sort glyph.

To fix this I desided to underline column caption when mouse
in clicked in column header.

I tried

dataGridViewColumn.HeaderCell.Style.Font.Underline = true;

and

DataGridViewCellStyle dgvcellStyle = new DataGridViewCellStyle();

dgvcellStyle.Font.Underline = false;

dataGridViewColumn.HeaderCell.Style = dgvcellStyle;

but both attempts cause compile error

Property or indexer 'System.Drawing.Font.Underline' cannot be assigned to --
it is read only

How to underline grid column caption at runtime ?
Or any other idea how to fix soft glyph visibility issue ?

Andrus.

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Fredo - 02 Mar 2008 22:59 GMT

You have to assign a new font object to dgvcellStyle.Font. You can't change
the style of a font after it's been created. So you'd basically want to take
the existing font, query its styles (size, style, family, etc) and create a
new font with everything the same, but adding underline.

> .NET 2 Winforms DataGridView.
>
[quoted text clipped - 29 lines]
>
> Andrus.

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Fredo - 02 Mar 2008 23:01 GMT

One other thing. I haven't actually tried this, but it occurred to me, that
may not work either. I'm not sure if you can change a column style while the
is being displayed. You may have to actually create a new style. I don't
know. I suspect it'll work as I said, but if that doesn't, try replacing the
style.

> You have to assign a new font object to dgvcellStyle.Font. You can't
> change the style of a font after it's been created. So you'd basically
[quoted text clipped - 34 lines]
>>
>> Andrus.

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Andrus - 03 Mar 2008 18:19 GMT

Fredo,

> One other thing. I haven't actually tried this, but it occurred to me,
> that may not work either. I'm not sure if you can change a column style
> while the is being displayed. You may have to actually create a new style.
> I don't know. I suspect it'll work as I said, but if that doesn't, try
> replacing the style.

Thank you. I tried

System.Drawing.Font f = new System.Drawing.Font(
dataGridViewColumn.HeaderCell.Style.Font,
System.Drawing.FontStyle.Regular );

dataGridViewColumn.HeaderCell.Style.Font = f;

But got excpetion since dataGridViewColumn.HeaderCell.Style.Font is null .
How to take existing column header font ?

Andrus.

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Fredo - 04 Mar 2008 21:33 GMT

You said: dataGridViewColumn.HeaderCell.Style.Font is null .
Did you mean: dataGridViewColumn.HeaderCell.Style is null .

The first one makes no sense in terms of what you were doing.

What it seems like you'll need to do is instantiate a new
DataGridViewCellStyle and set all the properties you need to for it, like
font, alignment, format, etc... and then set that into
dataGridViewColumn.HeaderCell.Style.

> Fredo,
>
[quoted text clipped - 17 lines]
>
> Andrus.

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Andrus - 05 Mar 2008 20:15 GMT

Fredo,

> What it seems like you'll need to do is instantiate a new
> DataGridViewCellStyle and set all the properties you need to for it, like
> font, alignment, format, etc... and then set that into
> dataGridViewColumn.HeaderCell.Style.

Thank you.
I tried code below but got compile time error shown in comment.
How to underline column header text so that all other header attributes are
not changed ?

Andrus.

foreach (DataGridViewColumn dataGridViewColumn in grid.Columns) {
DataGridViewCellStyle dgvcellStyle = new DataGridViewCellStyle();
System.Drawing.Font font = new
System.Drawing.Font(dataGridViewColumn.HeaderCell.Style.Font,
System.Drawing.FontStyle.Regular);

// Property or indexer 'System.Drawing.Font.Underline' cannot be assigned
to -- it is read only
font.Underline = true;
dgvcellStyle.Font = font;
dataGridViewColumn.HeaderCell.Style = dgvcellStyle;
}

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Mel - 05 Mar 2008 20:25 GMT

where you created the font just change System.Drawing.FontStyle.Regular to
System.Drawing.FontStyle.Underline

> Fredo,
>
[quoted text clipped - 23 lines]
> dataGridViewColumn.HeaderCell.Style = dgvcellStyle;
> }

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Andrus - 05 Mar 2008 21:08 GMT

Mel,

> where you created the font just change System.Drawing.FontStyle.Regular to
> System.Drawing.FontStyle.Underline

Thank you.

I tried

foreach (DataGridViewColumn dataGridViewColumn in grid.Columns) {
DataGridViewCellStyle dgvcellStyle = new DataGridViewCellStyle();
System.Drawing.Font font = new System.Drawing.Font(
dataGridViewColumn.HeaderCell.Style.Font,
System.Drawing.FontStyle.Underline );
dgvcellStyle.Font = font;
dataGridViewColumn.HeaderCell.Style = dgvcellStyle;
}

But got exception probably since debugger shows that

dataGridViewColumn.HeaderCell.Style.Font

is null.

dataGridViewColumn.HeaderCell.Style is not null.

How to fix ?

Andrus.

Exception details which occurs:

System.NullReferenceException was unhandled
Message="Object reference not set to an instance of an object."
Source="System.Drawing"
StackTrace:
at System.Drawing.Font..ctor(Font prototype, FontStyle newStyle)
at myapp.BrowseForm`1.QueryData(Kontekst ko)
...

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Underlining datagridview column caption

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