Mixing
How to format a specific item in the ComboBox in a DataGridViewComboBoxColumn?
2
I have code similar to this in a method that (re)creates the columns in the DataGridView:
MyColumn = new DataGridViewComboBoxColumn()
{
Name = "..",
HeaderText = "..",
SortMode = DataGridViewColumnSortMode.NotSortable
};
MyColumn.Items.Clear();
foreach (string s in MyStringList)
{
MyColumn.Items.Add(s);
}
MyColumn.Items.Add("");
// I would like this empty string to be shown as "No group"
// with an italic grayed out font
I think that I probably must create a class for the items of the ComboBox-es in the column, in which I should override the ToString() method, but I want to know how to format the No Group item.
A related question is here which is a about a normal ComboBox not inside a DataGridView, with the answer solving the problem using the DrawMode prperty and DrawItem event of the ComboBox class.
c# .net winforms datagridview datagridviewcolumn
edited Jan 25 at 16:23
Community♦
11
asked Jan 1 at 12:43
silviubogansilviubogan
1,08111127
add a comment |
2
I have code similar to this in a method that (re)creates the columns in the DataGridView:
MyColumn = new DataGridViewComboBoxColumn()
{
Name = "..",
HeaderText = "..",
SortMode = DataGridViewColumnSortMode.NotSortable
};
MyColumn.Items.Clear();
foreach (string s in MyStringList)
{
MyColumn.Items.Add(s);
}
MyColumn.Items.Add("");
// I would like this empty string to be shown as "No group"
// with an italic grayed out font
I think that I probably must create a class for the items of the ComboBox-es in the column, in which I should override the ToString() method, but I want to know how to format the No Group item.
A related question is here which is a about a normal ComboBox not inside a DataGridView, with the answer solving the problem using the DrawMode prperty and DrawItem event of the ComboBox class.
c# .net winforms datagridview datagridviewcolumn
edited Jan 25 at 16:23
Community♦
11
asked Jan 1 at 12:43
silviubogansilviubogan
1,08111127
Why notMyColumn.Items.Add("No Group");?
– Chetan Ranpariya
Jan 1 at 12:51
Thank you for your comment. I updated the question with "No Group" as the text that I want to format.
– silviubogan
Jan 1 at 13:00
MyColumn.DisplayStyleisDropDownButtonso you should be able to useComboBoxRendererclass forDrawDropDownButtonas explained here stackoverflow.com/a/7486187/2516718
– derloopkat
Jan 1 at 14:26
@derloopkat Thank you. This solves my problem partially, but I am looking for a way to paint the drop-down menus of the ComboBox-es inside a ComboBox column, besides the painting of the closed ComboBox-es.
– silviubogan
Jan 1 at 15:02
add a comment |
2
2
2
0
I have code similar to this in a method that (re)creates the columns in the DataGridView:
MyColumn = new DataGridViewComboBoxColumn()
{
Name = "..",
HeaderText = "..",
SortMode = DataGridViewColumnSortMode.NotSortable
};
MyColumn.Items.Clear();
foreach (string s in MyStringList)
{
MyColumn.Items.Add(s);
}
MyColumn.Items.Add("");
// I would like this empty string to be shown as "No group"
// with an italic grayed out font
I think that I probably must create a class for the items of the ComboBox-es in the column, in which I should override the ToString() method, but I want to know how to format the No Group item.
A related question is here which is a about a normal ComboBox not inside a DataGridView, with the answer solving the problem using the DrawMode prperty and DrawItem event of the ComboBox class.
c# .net winforms datagridview datagridviewcolumn
edited Jan 25 at 16:23
Community♦
11
asked Jan 1 at 12:43
silviubogansilviubogan
1,08111127
I have code similar to this in a method that (re)creates the columns in the DataGridView:
MyColumn = new DataGridViewComboBoxColumn()
{
Name = "..",
HeaderText = "..",
SortMode = DataGridViewColumnSortMode.NotSortable
};
MyColumn.Items.Clear();
foreach (string s in MyStringList)
{
MyColumn.Items.Add(s);
}
MyColumn.Items.Add("");
// I would like this empty string to be shown as "No group"
// with an italic grayed out font
I think that I probably must create a class for the items of the ComboBox-es in the column, in which I should override the ToString() method, but I want to know how to format the No Group item.
A related question is here which is a about a normal ComboBox not inside a DataGridView, with the answer solving the problem using the DrawMode prperty and DrawItem event of the ComboBox class.
c# .net winforms datagridview datagridviewcolumn
c# .net winforms datagridview datagridviewcolumn
edited Jan 25 at 16:23
Community♦
11
asked Jan 1 at 12:43
silviubogansilviubogan
1,08111127
edited Jan 25 at 16:23
Community♦
11
asked Jan 1 at 12:43
silviubogansilviubogan
1,08111127
edited Jan 25 at 16:23
Community♦
11
edited Jan 25 at 16:23
Community♦
11
edited Jan 25 at 16:23
Community♦
11
11
asked Jan 1 at 12:43
silviubogansilviubogan
1,08111127
asked Jan 1 at 12:43
silviubogansilviubogan
1,08111127
asked Jan 1 at 12:43
silviubogansilviubogan
1,08111127
1,08111127
Why notMyColumn.Items.Add("No Group");?
– Chetan Ranpariya
Jan 1 at 12:51
Thank you for your comment. I updated the question with "No Group" as the text that I want to format.
– silviubogan
Jan 1 at 13:00
MyColumn.DisplayStyleisDropDownButtonso you should be able to useComboBoxRendererclass forDrawDropDownButtonas explained here stackoverflow.com/a/7486187/2516718
– derloopkat
Jan 1 at 14:26
@derloopkat Thank you. This solves my problem partially, but I am looking for a way to paint the drop-down menus of the ComboBox-es inside a ComboBox column, besides the painting of the closed ComboBox-es.
– silviubogan
Jan 1 at 15:02
add a comment |
Why notMyColumn.Items.Add("No Group");?
– Chetan Ranpariya
Jan 1 at 12:51
Thank you for your comment. I updated the question with "No Group" as the text that I want to format.
– silviubogan
Jan 1 at 13:00
MyColumn.DisplayStyleisDropDownButtonso you should be able to useComboBoxRendererclass forDrawDropDownButtonas explained here stackoverflow.com/a/7486187/2516718
– derloopkat
Jan 1 at 14:26
@derloopkat Thank you. This solves my problem partially, but I am looking for a way to paint the drop-down menus of the ComboBox-es inside a ComboBox column, besides the painting of the closed ComboBox-es.
– silviubogan
Jan 1 at 15:02
Why not
MyColumn.Items.Add("No Group"); ?– Chetan Ranpariya
Jan 1 at 12:51
Why not
MyColumn.Items.Add("No Group"); ?– Chetan Ranpariya
Jan 1 at 12:51
Thank you for your comment. I updated the question with "No Group" as the text that I want to format.
– silviubogan
Jan 1 at 13:00
Thank you for your comment. I updated the question with "No Group" as the text that I want to format.
– silviubogan
Jan 1 at 13:00
MyColumn.DisplayStyle is DropDownButton so you should be able to use ComboBoxRenderer class for DrawDropDownButton as explained here stackoverflow.com/a/7486187/2516718– derloopkat
Jan 1 at 14:26
MyColumn.DisplayStyle is DropDownButton so you should be able to use ComboBoxRenderer class for DrawDropDownButton as explained here stackoverflow.com/a/7486187/2516718– derloopkat
Jan 1 at 14:26
@derloopkat Thank you. This solves my problem partially, but I am looking for a way to paint the drop-down menus of the ComboBox-es inside a ComboBox column, besides the painting of the closed ComboBox-es.
– silviubogan
Jan 1 at 15:02
@derloopkat Thank you. This solves my problem partially, but I am looking for a way to paint the drop-down menus of the ComboBox-es inside a ComboBox column, besides the painting of the closed ComboBox-es.
– silviubogan
Jan 1 at 15:02
add a comment |
1 Answer
1
active
oldest
votes
0
For custom-painting the ComboBox, you need to handle EditingControlShowing and then get the EditingControl which is DataGridViewComboBoxEditingControl and then set its DrawMode to OwnerDrawFixed and handle its DrawItem event.
For custom-painting the cell, you need to handle CellPainting event and set different font and color for the cell styles and let the paint continue with new values. You can also paint the whole cell if you want.
Example
Load Sample Data:
private DataTable LoadProducts()
{
var dt = new DataTable();
dt.Columns.Add("Name");
dt.Columns.Add("CategoryId", typeof(int));
dt.Rows.Add("P1", 1);
dt.Rows.Add("P2", 1);
dt.Rows.Add("P3", DBNull.Value);
return dt;
}
private DataTable LoadCategories()
{
var dt = new DataTable();
dt.Columns.Add("Id", typeof(int));
dt.Columns.Add("Name");
dt.Rows.Add(DBNull.Value, "No Category");
dt.Rows.Add(1, "C1");
dt.Rows.Add(2, "C2");
dt.Rows.Add(2, "C3");
return dt;
}
Setup DataGridView Columnms:
private void Form1_Load(object sender, EventArgs e)
{
var products = LoadProducts();
var categories = LoadCategories();
dataGridView1.Columns.Add(new DataGridViewTextBoxColumn()
{
Name = "NameColumn",
DataPropertyName = "Name",
HeaderText = "Name"
});
dataGridView1.Columns.Add(new DataGridViewComboBoxColumn()
{
Name = "CategoryIdColumn",
DataPropertyName = "CategoryId",
HeaderText = "Category",
DataSource = categories,
ValueMember = "Id",
DisplayMember = "Name",
DisplayStyle= DataGridViewComboBoxDisplayStyle.Nothing
});
dataGridView1.DataSource = products;
dataGridView1.EditingControlShowing += DataGridView1_EditingControlShowing;
dataGridView1.CellPainting += DataGridView1_CellPainting;
}
Handle EditingControlShowing
private void DataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
if (dataGridView1?.CurrentCell?.OwningColumn?.Name != "CategoryIdColumn")
return;
var combo = e.Control as DataGridViewComboBoxEditingControl;
if (combo == null)
return;
combo.DrawMode = DrawMode.OwnerDrawFixed;
combo.DrawItem += (obj, args) =>
{
var txt = args.Index >= 0 ? combo.GetItemText(combo.Items[args.Index]) : "";
var textColor = args.Index == 0 ? SystemColors.GrayText : SystemColors.ControlText;
var font = args.Index == 0 ? new Font(combo.Font, FontStyle.Italic) : combo.Font;
if ((args.State & DrawItemState.Selected) == DrawItemState.Selected)
{
textColor = SystemColors.HighlightText;
}
args.DrawBackground();
TextRenderer.DrawText(args.Graphics, txt, font,
args.Bounds, textColor,
TextFormatFlags.VerticalCenter | TextFormatFlags.Left);
};
}
Handle CellPainting
private void DataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
if (e.ColumnIndex < 0 || e.RowIndex < 0 ||
dataGridView1.Columns[e.ColumnIndex].Name != "CategoryIdColumn")
return;
if (dataGridView1[e.ColumnIndex, e.RowIndex].Value == DBNull.Value)
{
e.CellStyle.Font = new Font(e.CellStyle.Font, FontStyle.Italic);
e.CellStyle.ForeColor = SystemColors.GrayText;
}
else
{
e.CellStyle.Font = new Font(e.CellStyle.Font, FontStyle.Regular);
e.CellStyle.ForeColor = SystemColors.ControlText;
}
}
answered Jan 1 at 15:13
Reza AghaeiReza Aghaei
68.1k857171
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
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active
oldest
votes
0
For custom-painting the ComboBox, you need to handle EditingControlShowing and then get the EditingControl which is DataGridViewComboBoxEditingControl and then set its DrawMode to OwnerDrawFixed and handle its DrawItem event.
For custom-painting the cell, you need to handle CellPainting event and set different font and color for the cell styles and let the paint continue with new values. You can also paint the whole cell if you want.
Example
Load Sample Data:
private DataTable LoadProducts()
{
var dt = new DataTable();
dt.Columns.Add("Name");
dt.Columns.Add("CategoryId", typeof(int));
dt.Rows.Add("P1", 1);
dt.Rows.Add("P2", 1);
dt.Rows.Add("P3", DBNull.Value);
return dt;
}
private DataTable LoadCategories()
{
var dt = new DataTable();
dt.Columns.Add("Id", typeof(int));
dt.Columns.Add("Name");
dt.Rows.Add(DBNull.Value, "No Category");
dt.Rows.Add(1, "C1");
dt.Rows.Add(2, "C2");
dt.Rows.Add(2, "C3");
return dt;
}
Setup DataGridView Columnms:
private void Form1_Load(object sender, EventArgs e)
{
var products = LoadProducts();
var categories = LoadCategories();
dataGridView1.Columns.Add(new DataGridViewTextBoxColumn()
{
Name = "NameColumn",
DataPropertyName = "Name",
HeaderText = "Name"
});
dataGridView1.Columns.Add(new DataGridViewComboBoxColumn()
{
Name = "CategoryIdColumn",
DataPropertyName = "CategoryId",
HeaderText = "Category",
DataSource = categories,
ValueMember = "Id",
DisplayMember = "Name",
DisplayStyle= DataGridViewComboBoxDisplayStyle.Nothing
});
dataGridView1.DataSource = products;
dataGridView1.EditingControlShowing += DataGridView1_EditingControlShowing;
dataGridView1.CellPainting += DataGridView1_CellPainting;
}
Handle EditingControlShowing
private void DataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
if (dataGridView1?.CurrentCell?.OwningColumn?.Name != "CategoryIdColumn")
return;
var combo = e.Control as DataGridViewComboBoxEditingControl;
if (combo == null)
return;
combo.DrawMode = DrawMode.OwnerDrawFixed;
combo.DrawItem += (obj, args) =>
{
var txt = args.Index >= 0 ? combo.GetItemText(combo.Items[args.Index]) : "";
var textColor = args.Index == 0 ? SystemColors.GrayText : SystemColors.ControlText;
var font = args.Index == 0 ? new Font(combo.Font, FontStyle.Italic) : combo.Font;
if ((args.State & DrawItemState.Selected) == DrawItemState.Selected)
{
textColor = SystemColors.HighlightText;
}
args.DrawBackground();
TextRenderer.DrawText(args.Graphics, txt, font,
args.Bounds, textColor,
TextFormatFlags.VerticalCenter | TextFormatFlags.Left);
};
}
Handle CellPainting
private void DataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
if (e.ColumnIndex < 0 || e.RowIndex < 0 ||
dataGridView1.Columns[e.ColumnIndex].Name != "CategoryIdColumn")
return;
if (dataGridView1[e.ColumnIndex, e.RowIndex].Value == DBNull.Value)
{
e.CellStyle.Font = new Font(e.CellStyle.Font, FontStyle.Italic);
e.CellStyle.ForeColor = SystemColors.GrayText;
}
else
{
e.CellStyle.Font = new Font(e.CellStyle.Font, FontStyle.Regular);
e.CellStyle.ForeColor = SystemColors.ControlText;
}
}
answered Jan 1 at 15:13
Reza AghaeiReza Aghaei
68.1k857171
add a comment |
0
For custom-painting the ComboBox, you need to handle EditingControlShowing and then get the EditingControl which is DataGridViewComboBoxEditingControl and then set its DrawMode to OwnerDrawFixed and handle its DrawItem event.
For custom-painting the cell, you need to handle CellPainting event and set different font and color for the cell styles and let the paint continue with new values. You can also paint the whole cell if you want.
Example
Load Sample Data:
private DataTable LoadProducts()
{
var dt = new DataTable();
dt.Columns.Add("Name");
dt.Columns.Add("CategoryId", typeof(int));
dt.Rows.Add("P1", 1);
dt.Rows.Add("P2", 1);
dt.Rows.Add("P3", DBNull.Value);
return dt;
}
private DataTable LoadCategories()
{
var dt = new DataTable();
dt.Columns.Add("Id", typeof(int));
dt.Columns.Add("Name");
dt.Rows.Add(DBNull.Value, "No Category");
dt.Rows.Add(1, "C1");
dt.Rows.Add(2, "C2");
dt.Rows.Add(2, "C3");
return dt;
}
Setup DataGridView Columnms:
private void Form1_Load(object sender, EventArgs e)
{
var products = LoadProducts();
var categories = LoadCategories();
dataGridView1.Columns.Add(new DataGridViewTextBoxColumn()
{
Name = "NameColumn",
DataPropertyName = "Name",
HeaderText = "Name"
});
dataGridView1.Columns.Add(new DataGridViewComboBoxColumn()
{
Name = "CategoryIdColumn",
DataPropertyName = "CategoryId",
HeaderText = "Category",
DataSource = categories,
ValueMember = "Id",
DisplayMember = "Name",
DisplayStyle= DataGridViewComboBoxDisplayStyle.Nothing
});
dataGridView1.DataSource = products;
dataGridView1.EditingControlShowing += DataGridView1_EditingControlShowing;
dataGridView1.CellPainting += DataGridView1_CellPainting;
}
Handle EditingControlShowing
private void DataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
if (dataGridView1?.CurrentCell?.OwningColumn?.Name != "CategoryIdColumn")
return;
var combo = e.Control as DataGridViewComboBoxEditingControl;
if (combo == null)
return;
combo.DrawMode = DrawMode.OwnerDrawFixed;
combo.DrawItem += (obj, args) =>
{
var txt = args.Index >= 0 ? combo.GetItemText(combo.Items[args.Index]) : "";
var textColor = args.Index == 0 ? SystemColors.GrayText : SystemColors.ControlText;
var font = args.Index == 0 ? new Font(combo.Font, FontStyle.Italic) : combo.Font;
if ((args.State & DrawItemState.Selected) == DrawItemState.Selected)
{
textColor = SystemColors.HighlightText;
}
args.DrawBackground();
TextRenderer.DrawText(args.Graphics, txt, font,
args.Bounds, textColor,
TextFormatFlags.VerticalCenter | TextFormatFlags.Left);
};
}
Handle CellPainting
private void DataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
if (e.ColumnIndex < 0 || e.RowIndex < 0 ||
dataGridView1.Columns[e.ColumnIndex].Name != "CategoryIdColumn")
return;
if (dataGridView1[e.ColumnIndex, e.RowIndex].Value == DBNull.Value)
{
e.CellStyle.Font = new Font(e.CellStyle.Font, FontStyle.Italic);
e.CellStyle.ForeColor = SystemColors.GrayText;
}
else
{
e.CellStyle.Font = new Font(e.CellStyle.Font, FontStyle.Regular);
e.CellStyle.ForeColor = SystemColors.ControlText;
}
}
answered Jan 1 at 15:13
Reza AghaeiReza Aghaei
68.1k857171
add a comment |
0
0
0
For custom-painting the ComboBox, you need to handle EditingControlShowing and then get the EditingControl which is DataGridViewComboBoxEditingControl and then set its DrawMode to OwnerDrawFixed and handle its DrawItem event.
For custom-painting the cell, you need to handle CellPainting event and set different font and color for the cell styles and let the paint continue with new values. You can also paint the whole cell if you want.
Example
Load Sample Data:
private DataTable LoadProducts()
{
var dt = new DataTable();
dt.Columns.Add("Name");
dt.Columns.Add("CategoryId", typeof(int));
dt.Rows.Add("P1", 1);
dt.Rows.Add("P2", 1);
dt.Rows.Add("P3", DBNull.Value);
return dt;
}
private DataTable LoadCategories()
{
var dt = new DataTable();
dt.Columns.Add("Id", typeof(int));
dt.Columns.Add("Name");
dt.Rows.Add(DBNull.Value, "No Category");
dt.Rows.Add(1, "C1");
dt.Rows.Add(2, "C2");
dt.Rows.Add(2, "C3");
return dt;
}
Setup DataGridView Columnms:
private void Form1_Load(object sender, EventArgs e)
{
var products = LoadProducts();
var categories = LoadCategories();
dataGridView1.Columns.Add(new DataGridViewTextBoxColumn()
{
Name = "NameColumn",
DataPropertyName = "Name",
HeaderText = "Name"
});
dataGridView1.Columns.Add(new DataGridViewComboBoxColumn()
{
Name = "CategoryIdColumn",
DataPropertyName = "CategoryId",
HeaderText = "Category",
DataSource = categories,
ValueMember = "Id",
DisplayMember = "Name",
DisplayStyle= DataGridViewComboBoxDisplayStyle.Nothing
});
dataGridView1.DataSource = products;
dataGridView1.EditingControlShowing += DataGridView1_EditingControlShowing;
dataGridView1.CellPainting += DataGridView1_CellPainting;
}
Handle EditingControlShowing
private void DataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
if (dataGridView1?.CurrentCell?.OwningColumn?.Name != "CategoryIdColumn")
return;
var combo = e.Control as DataGridViewComboBoxEditingControl;
if (combo == null)
return;
combo.DrawMode = DrawMode.OwnerDrawFixed;
combo.DrawItem += (obj, args) =>
{
var txt = args.Index >= 0 ? combo.GetItemText(combo.Items[args.Index]) : "";
var textColor = args.Index == 0 ? SystemColors.GrayText : SystemColors.ControlText;
var font = args.Index == 0 ? new Font(combo.Font, FontStyle.Italic) : combo.Font;
if ((args.State & DrawItemState.Selected) == DrawItemState.Selected)
{
textColor = SystemColors.HighlightText;
}
args.DrawBackground();
TextRenderer.DrawText(args.Graphics, txt, font,
args.Bounds, textColor,
TextFormatFlags.VerticalCenter | TextFormatFlags.Left);
};
}
Handle CellPainting
private void DataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
if (e.ColumnIndex < 0 || e.RowIndex < 0 ||
dataGridView1.Columns[e.ColumnIndex].Name != "CategoryIdColumn")
return;
if (dataGridView1[e.ColumnIndex, e.RowIndex].Value == DBNull.Value)
{
e.CellStyle.Font = new Font(e.CellStyle.Font, FontStyle.Italic);
e.CellStyle.ForeColor = SystemColors.GrayText;
}
else
{
e.CellStyle.Font = new Font(e.CellStyle.Font, FontStyle.Regular);
e.CellStyle.ForeColor = SystemColors.ControlText;
}
}
answered Jan 1 at 15:13
Reza AghaeiReza Aghaei
68.1k857171
For custom-painting the ComboBox, you need to handle EditingControlShowing and then get the EditingControl which is DataGridViewComboBoxEditingControl and then set its DrawMode to OwnerDrawFixed and handle its DrawItem event.
For custom-painting the cell, you need to handle CellPainting event and set different font and color for the cell styles and let the paint continue with new values. You can also paint the whole cell if you want.
Example
Load Sample Data:
private DataTable LoadProducts()
{
var dt = new DataTable();
dt.Columns.Add("Name");
dt.Columns.Add("CategoryId", typeof(int));
dt.Rows.Add("P1", 1);
dt.Rows.Add("P2", 1);
dt.Rows.Add("P3", DBNull.Value);
return dt;
}
private DataTable LoadCategories()
{
var dt = new DataTable();
dt.Columns.Add("Id", typeof(int));
dt.Columns.Add("Name");
dt.Rows.Add(DBNull.Value, "No Category");
dt.Rows.Add(1, "C1");
dt.Rows.Add(2, "C2");
dt.Rows.Add(2, "C3");
return dt;
}
Setup DataGridView Columnms:
private void Form1_Load(object sender, EventArgs e)
{
var products = LoadProducts();
var categories = LoadCategories();
dataGridView1.Columns.Add(new DataGridViewTextBoxColumn()
{
Name = "NameColumn",
DataPropertyName = "Name",
HeaderText = "Name"
});
dataGridView1.Columns.Add(new DataGridViewComboBoxColumn()
{
Name = "CategoryIdColumn",
DataPropertyName = "CategoryId",
HeaderText = "Category",
DataSource = categories,
ValueMember = "Id",
DisplayMember = "Name",
DisplayStyle= DataGridViewComboBoxDisplayStyle.Nothing
});
dataGridView1.DataSource = products;
dataGridView1.EditingControlShowing += DataGridView1_EditingControlShowing;
dataGridView1.CellPainting += DataGridView1_CellPainting;
}
Handle EditingControlShowing
private void DataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
if (dataGridView1?.CurrentCell?.OwningColumn?.Name != "CategoryIdColumn")
return;
var combo = e.Control as DataGridViewComboBoxEditingControl;
if (combo == null)
return;
combo.DrawMode = DrawMode.OwnerDrawFixed;
combo.DrawItem += (obj, args) =>
{
var txt = args.Index >= 0 ? combo.GetItemText(combo.Items[args.Index]) : "";
var textColor = args.Index == 0 ? SystemColors.GrayText : SystemColors.ControlText;
var font = args.Index == 0 ? new Font(combo.Font, FontStyle.Italic) : combo.Font;
if ((args.State & DrawItemState.Selected) == DrawItemState.Selected)
{
textColor = SystemColors.HighlightText;
}
args.DrawBackground();
TextRenderer.DrawText(args.Graphics, txt, font,
args.Bounds, textColor,
TextFormatFlags.VerticalCenter | TextFormatFlags.Left);
};
}
Handle CellPainting
private void DataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
if (e.ColumnIndex < 0 || e.RowIndex < 0 ||
dataGridView1.Columns[e.ColumnIndex].Name != "CategoryIdColumn")
return;
if (dataGridView1[e.ColumnIndex, e.RowIndex].Value == DBNull.Value)
{
e.CellStyle.Font = new Font(e.CellStyle.Font, FontStyle.Italic);
e.CellStyle.ForeColor = SystemColors.GrayText;
}
else
{
e.CellStyle.Font = new Font(e.CellStyle.Font, FontStyle.Regular);
e.CellStyle.ForeColor = SystemColors.ControlText;
}
}
answered Jan 1 at 15:13
Reza AghaeiReza Aghaei
68.1k857171
answered Jan 1 at 15:13
Reza AghaeiReza Aghaei
68.1k857171
answered Jan 1 at 15:13
Reza AghaeiReza Aghaei
68.1k857171
answered Jan 1 at 15:13
Reza AghaeiReza Aghaei
68.1k857171
68.1k857171
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Why not
MyColumn.Items.Add("No Group");?– Chetan Ranpariya
Jan 1 at 12:51
Thank you for your comment. I updated the question with "No Group" as the text that I want to format.
– silviubogan
Jan 1 at 13:00
MyColumn.DisplayStyleisDropDownButtonso you should be able to useComboBoxRendererclass forDrawDropDownButtonas explained here stackoverflow.com/a/7486187/2516718– derloopkat
Jan 1 at 14:26
@derloopkat Thank you. This solves my problem partially, but I am looking for a way to paint the drop-down menus of the ComboBox-es inside a ComboBox column, besides the painting of the closed ComboBox-es.
– silviubogan
Jan 1 at 15:02