DataGridViewComboBoxColumn.FlatStyle Property
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Gets or sets the flat style appearance of the column's cells.
public:
property System::Windows::Forms::FlatStyle FlatStyle { System::Windows::Forms::FlatStyle get(); void set(System::Windows::Forms::FlatStyle value); };public System.Windows.Forms.FlatStyle FlatStyle { get; set; }member this.FlatStyle : System.Windows.Forms.FlatStyle with get, setPublic Property FlatStyle As FlatStyleProperty Value
A FlatStyle value indicating the cell appearance. The default is Standard.
Exceptions
The value of the CellTemplate property is null.
Examples
The following code example demonstrates how to use a DataGridViewComboBoxColumn to aid in entering data into the TitleOfCourtesy column. This example is part of a larger example available in the DataGridViewComboBoxColumn class overview topic.
private:
DataGridViewComboBoxColumn^ CreateComboBoxColumn()
{
DataGridViewComboBoxColumn^ column =
gcnew DataGridViewComboBoxColumn();
{
column->DataPropertyName = ColumnName::TitleOfCourtesy.ToString();
column->HeaderText = ColumnName::TitleOfCourtesy.ToString();
column->DropDownWidth = 160;
column->Width = 90;
column->MaxDropDownItems = 3;
column->FlatStyle = FlatStyle::Flat;
}
return column;
}
private:
void SetAlternateChoicesUsingDataSource(DataGridViewComboBoxColumn^ comboboxColumn)
{
{
comboboxColumn->DataSource = RetrieveAlternativeTitles();
comboboxColumn->ValueMember = ColumnName::TitleOfCourtesy.ToString();
comboboxColumn->DisplayMember = comboboxColumn->ValueMember;
}
}
private:
DataTable^ RetrieveAlternativeTitles()
{
return Populate("SELECT distinct TitleOfCourtesy FROM Employees");
}
String^ connectionString;
private:
DataTable^ Populate(String^ sqlCommand)
{
SqlConnection^ northwindConnection = gcnew SqlConnection(connectionString);
northwindConnection->Open();
SqlCommand^ command = gcnew SqlCommand(sqlCommand, northwindConnection);
SqlDataAdapter^ adapter = gcnew SqlDataAdapter();
adapter->SelectCommand = command;
DataTable^ table = gcnew DataTable();
adapter->Fill(table);
return table;
}
// Using an enum provides some abstraction between column index
// and column name along with compile time checking, and gives
// a handy place to store the column names.
enum class ColumnName
{
EmployeeID,
LastName,
FirstName,
Title,
TitleOfCourtesy,
BirthDate,
HireDate,
Address,
City,
Region,
PostalCode,
Country,
HomePhone,
Extension,
Photo,
Notes,
ReportsTo,
PhotoPath,
OutOfOffice
};
private DataGridViewComboBoxColumn CreateComboBoxColumn()
{
DataGridViewComboBoxColumn column =
new DataGridViewComboBoxColumn();
{
column.DataPropertyName = ColumnName.TitleOfCourtesy.ToString();
column.HeaderText = ColumnName.TitleOfCourtesy.ToString();
column.DropDownWidth = 160;
column.Width = 90;
column.MaxDropDownItems = 3;
column.FlatStyle = FlatStyle.Flat;
}
return column;
}
private void SetAlternateChoicesUsingDataSource(DataGridViewComboBoxColumn comboboxColumn)
{
{
comboboxColumn.DataSource = RetrieveAlternativeTitles();
comboboxColumn.ValueMember = ColumnName.TitleOfCourtesy.ToString();
comboboxColumn.DisplayMember = comboboxColumn.ValueMember;
}
}
private DataTable RetrieveAlternativeTitles()
{
return Populate("SELECT distinct TitleOfCourtesy FROM Employees");
}
string connectionString =
"Integrated Security=SSPI;Persist Security Info=False;" +
"Initial Catalog=Northwind;Data Source=localhost";
private DataTable Populate(string sqlCommand)
{
SqlConnection northwindConnection = new SqlConnection(connectionString);
northwindConnection.Open();
SqlCommand command = new SqlCommand(sqlCommand, northwindConnection);
SqlDataAdapter adapter = new SqlDataAdapter();
adapter.SelectCommand = command;
DataTable table = new DataTable();
table.Locale = System.Globalization.CultureInfo.InvariantCulture;
adapter.Fill(table);
return table;
}
// Using an enum provides some abstraction between column index
// and column name along with compile time checking, and gives
// a handy place to store the column names.
enum ColumnName
{
EmployeeId,
LastName,
FirstName,
Title,
TitleOfCourtesy,
BirthDate,
HireDate,
Address,
City,
Region,
PostalCode,
Country,
HomePhone,
Extension,
Photo,
Notes,
ReportsTo,
PhotoPath,
OutOfOffice
};
Private Function CreateComboBoxColumn() _
As DataGridViewComboBoxColumn
Dim column As New DataGridViewComboBoxColumn()
With column
.DataPropertyName = ColumnName.TitleOfCourtesy.ToString()
.HeaderText = ColumnName.TitleOfCourtesy.ToString()
.DropDownWidth = 160
.Width = 90
.MaxDropDownItems = 3
.FlatStyle = FlatStyle.Flat
End With
Return column
End Function
Private Sub SetAlternateChoicesUsingDataSource( _
ByVal comboboxColumn As DataGridViewComboBoxColumn)
With comboboxColumn
.DataSource = RetrieveAlternativeTitles()
.ValueMember = ColumnName.TitleOfCourtesy.ToString()
.DisplayMember = .ValueMember
End With
End Sub
Private Function RetrieveAlternativeTitles() As DataTable
Return Populate( _
"SELECT distinct TitleOfCourtesy FROM Employees")
End Function
Private connectionString As String = _
"Integrated Security=SSPI;Persist Security Info=False;" _
& "Initial Catalog=Northwind;Data Source=localhost"
Private Function Populate(ByVal sqlCommand As String) As DataTable
Dim northwindConnection As New SqlConnection(connectionString)
northwindConnection.Open()
Dim command As New SqlCommand(sqlCommand, _
northwindConnection)
Dim adapter As New SqlDataAdapter()
adapter.SelectCommand = command
Dim table As New DataTable()
table.Locale = System.Globalization.CultureInfo.InvariantCulture
adapter.Fill(table)
Return table
End Function
' Using an enum provides some abstraction between column index
' and column name along with compile time checking, and gives
' a handy place to store the column names.
Enum ColumnName
EmployeeId
LastName
FirstName
Title
TitleOfCourtesy
BirthDate
HireDate
Address
City
Region
PostalCode
Country
HomePhone
Extension
Photo
Notes
ReportsTo
PhotoPath
OutOfOffice
End Enum
Remarks
The FlatStyle property affects the behavior and appearance of the drop-down arrows for the cells in this column.
Starting with the .NET Framework 4.6, when the FlatStyle property is set to Flat or Popup the drop-down arrows are resized according to the system DPI settings when the app.config file contains the following entry:
<appSettings>
<add key="EnableWindowsFormsHighDpiAutoResizing" value="true" />
</appSettings>
To enable cell highlighting when the mouse pointer is over a cell, you must set the DisplayStyle property to ComboBox and the FlatStyle property to Popup.
Getting or setting this property gets or sets the FlatStyle property of the object returned by the CellTemplate property. Setting this property also sets the FlatStyle property of every cell in the column and refreshes the column display. To override the specified value for individual cells, set the cell values after you set the column value.
