Develop Reference

DataGridView row header cell text visibility

I have a DataGridView in my WinForms application. Basically, I want to input some 2D data there or something like that. It means, that I want to have both columns named and rows named. And so I did. But then there was a problem. When it's fine with column names, the row names tend to be not visible. For example:
The code I use to somehow "beautify" the DataGridView:
private void BeautifyTable(TableView tableView)
{
foreach (DataGridViewRow row in tableView.Rows)
{
row.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
}
foreach (DataGridViewColumn col in tableView.Columns)
{
col.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
col.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
col.AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;
}
}
TableView is a class created by me, and it inherits from DataGridView.
So now my question would be: Is there a way to somehow make those row names/titles appear in a normal way (in this particular case those are: s0, s1, s2.., but they're like cut from the left side).
P.S Is there a good way to "stretch" the columns? I mean if I have f.e 10 columns they would fill the whole DataGridView width, but if I would add (I do this dynamically) 5, so there would be 15 columns, still they would fit, just the width of every column would decrease?

Increase the width of the row header:
dataGridView1.RowHeadersWidth =
dataGridView1.RowHeadersWidth * 2; // or another value

Try to hide those arrows by setting the RowHeadersVisible to False in the properties of the datagridview at the Form.cs [Design] or just simply add the code below.
Me.DataGridView1.RowHeadersVisible = False

I actually found the best answer by myself.
You can set the WitdthSizeMode also for row headers, like this:
tableView.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.AutoSizeToAllHeaders;
And that's the result:

C# DataGridView - Choosing which columns to display

I have a DataGridView where its data is retrieved from a MySQL database. How do I only show columns to display?
One way is to use the Visible property of the Columns object and set dgv.Columns["col"].Visible = false;
But I want to do it the other way around. I want to choose which columns to display, not choose which columns to hide. Something like this:
dgv.Columns["col"].Display= true;

Try setting the AutoGenerateColumns property on the DataGridView to false. This will require you to specifically set myColumn.Visible = true for columns you would like to display.

how about first setting all columns to invisible and then setting the ones you want to visible?
for (int i = 0; i < dgv.Columns.Count; i++)
{
dgv.Columns[i].Visible = false;
}
dgv.Columns["this_one_i_want_to_see"].Visible = true;
dgv.Columns["this_one_i_want_to_see_too"].Visible = true;

DataGridView AutoFit and Fill

I have 3 columns in my DataGridView. What I am trying to do is have the first 2 columns auto fit to the width of the content, and have the 3rd column fill the remaining space.
Is it possible to do in WinForms? I am loading my data from an EF DataContext if that's any use. I have included an image of how it currently looks.

You need to use the DataGridViewColumn.AutoSizeMode property.
You can use one of these values for column 0 and 1:
AllCells: The column width adjusts to fit the contents of all cells in
the column, including the header cell.
AllCellsExceptHeader: The column width adjusts to fit the contents of all cells in the column, excluding the header cell.
DisplayedCells: The column width adjusts to
fit the contents of all cells in the column that are in rows currently
displayed onscreen, including the header cell.
DisplayedCellsExceptHeader: The column width adjusts to fit the
contents of all cells in the column that are in rows currently
displayed onscreen, excluding the header cell.
Then you use the Fill value for column 2
The column width adjusts so that the widths of all columns exactly fills the display area of the control...
this.DataGridView1.Columns[0].AutoSizeMode = DataGridViewAutoSizeColumnMode.DisplayedCells;
this.DataGridView1.Columns[1].AutoSizeMode = DataGridViewAutoSizeColumnMode.DisplayedCells;
this.DataGridView1.Columns[2].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
As pointed out by other users, the default value can be set at datagridview level with DataGridView.AutoSizeColumnsMode property.
this.DataGridView1.Columns[0].AutoSizeMode = DataGridViewAutoSizeColumnMode.DisplayedCells;
this.DataGridView1.Columns[1].AutoSizeMode = DataGridViewAutoSizeColumnMode.DisplayedCells;
could be:
this.DataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.DisplayedCells;
Important note:
If your grid is bound to a datasource and columns are auto-generated (AutoGenerateColumns property set to True), you need to use the DataBindingComplete event to apply style AFTER columns have been created.
In some scenarios (change cells value by code for example), I had to call DataGridView1.AutoResizeColumns(); to refresh the grid.

This is my favorite approach...
_dataGrid.DataBindingComplete += (o, _) =>
{
var dataGridView = o as DataGridView;
if (dataGridView != null)
{
dataGridView.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
dataGridView.Columns[dataGridView.ColumnCount-1].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
}
};

Just change Property from property of control:
AutoSizeColumnsMode:Fill
OR By code
dataGridView1.AutoSizeColumnsMode=DataGridViewAutoSizeColumnsMode.Fill;

Not tested but you can give a try. Tested and working. I hope you can play with AutoSizeMode of DataGridViewColum to achieve what you need.
Try setting
dataGridView1.DataSource = yourdatasource;<--set datasource before you set AutoSizeMode
//Set the following properties after setting datasource
dataGridView1.Columns[0].AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;
dataGridView1.Columns[1].AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;
dataGridView1.Columns[2].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
This should work

Try doing,
AutoSizeColumnMode = Fill;

public static void Fill(DataGridView dgv2)
{
try
{
dgv = dgv2;
foreach (DataGridViewColumn GridCol in dgv.Columns)
{
for (int j = 0; j < GridCol.DataGridView.ColumnCount; j++)
{
GridCol.DataGridView.Columns[j].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
GridCol.DataGridView.Columns[j].AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;
GridCol.DataGridView.Columns[j].FillWeight = 1;
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}

To build on AlfredBr's answer, if you hid some of your columns, you can use the following to auto-size all columns and then just have the last visible column fill the empty space:
myDgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
myDgv.Columns.GetLastColumn(DataGridViewElementStates.Visible, DataGridViewElementStates.None).AutoSizeMode =
DataGridViewAutoSizeColumnMode.Fill;

This is what I have done in order to get the column "first_name" fill the space when all the columns cannot do it.
When the grid goes to small the column "first_name" gets almost invisible (very thin) so I can set the DataGridViewAutoSizeColumnMode property to AllCells as the others visible columns. For performance issues it's important to set them to None before data binding it and set back to AllCells in the DataBindingComplete event handler of the grid. Hope it helps!
private void dataGridView1_Resize(object sender, EventArgs e)
{
int ColumnsWidth = 0;
foreach(DataGridViewColumn col in dataGridView1.Columns)
{
if (col.Visible) ColumnsWidth += col.Width;
}
if (ColumnsWidth <dataGridView1.Width)
{
dataGridView1.Columns["first_name"].AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
}
else if (dataGridView1.Columns["first_name"].Width < 10)
{
dataGridView1.Columns["first_name"].AutoSizeMode = DataGridViewAutoSizeColumnMode.AllCells;
}
}

public void setHeight(DataGridView src)
{
src.Height= src.ColumnHeadersVisible ? src.ColumnHeadersHeight : 0 + src.Rows.OfType<DataGridViewRow>().Where(row => row.Visible).Sum(row => row.Height);
}

Try this :
DGV.AutoResizeColumns();
DGV.AutoSizeColumnsMode=DataGridViewAutoSizeColumnsMode.AllCells;

Datagridview with multiple Tableadapters, view different colums for each view

I have a datagridview with multiple table adapters. every click on the dg exposes a new table on the same control.
How can i show different columns on click?
I've tried to use
DataGridViewColumn newCol = new DataGridViewColumn();
DataGridViewCell cell = new DataGridViewTextBoxCell();
newCol.CellTemplate = cell;
newCol.HeaderText = "numOfTexts";
newCol.Name = "numOfTexts";
newCol.Visible = true;
dg1.Columns.Add(newCol);
but it doesn't display the cell content, only the column name.
Thanks

You can use:
dg.AutoGenerateColumns = true;
See MSDN
true if the columns should be created automatically; otherwise, false. The default is true.
This is exactly what you need to display all columns of the table adapter.
You can hide the unnecessary columns.
Hope I helped...

PdfSharp Image in Cell overlapping on other rows

I started using PDFSharp the day before yesterday and I used the following code to add an Image to a cell:
Section section = this.document.AddSection();
Table table1 = section.Headers.Primary.AddTable();
Column column = table1.AddColumn("8.5cm");
column.Format.Alignment = ParagraphAlignment.Right;
column = table1.AddColumn("8.5cm");
column.Format.Alignment = ParagraphAlignment.Right;
Row row = table1.AddRow();
Image image = row.Cells[0].Elements.AddImage(#"C:\testdump\logo.jpg");
image.LockAspectRatio = true;
image.RelativeVertical = RelativeVertical.Line;
image.RelativeHorizontal = RelativeHorizontal.Margin;
image.Top = ShapePosition.Top;
image.Left = ShapePosition.Left;
image.WrapFormat.Style = WrapStyle.None;
I added another table after this one:
Table table2 = section.AddTable();
The image in the cell overlaps onto table2. Anyone know why this happens?

Seems like adding a "blank" row to the second table solved the issue. Not sure how that solves the overlapping.

AFAIK the line
image.WrapFormat.Style = WrapStyle.None;
creates a free-floating image. The image gets its position from the cell, but has no effect on the layout of the table.
Use WrapStyle.None if you want to overlap the image with text or other elements.