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XAML:

Код


        <DataGrid Grid.Row="1" Name="dataGrid" Style="{StaticResource StyleDirectoryDataGrid}" MouseDoubleClick="dataGrid_MouseDoubleClick">
            <DataGrid.Resources>
                <Style TargetType="DataGridColumnHeader">
                    <EventSetter Event="PreviewMouseDown" Handler="DataGridColumnHeader_PreviewMouseDown" />
                </Style>
            </DataGrid.Resources>

App.xaml

Код


        <Style TargetType="DataGrid" x:Key="StyleDirectoryDataGrid">
            <Setter Property="AutoGenerateColumns" Value="True"/>
            <Setter Property="Margin" Value="2,4,2,12" />
            <Setter Property="IsReadOnly" Value="true" /> 
            <Setter Property="HeadersVisibility" Value="Column" />
            <Setter Property="Background" Value="#FFFFFF" />
            <Setter Property="GridLinesVisibility" Value="All" />
            <Setter Property="VerticalGridLinesBrush" Value="#DCE1E9" />
            <Setter Property="HorizontalGridLinesBrush" Value="#DCE1E9" />
            <Setter Property="SelectionUnit" Value="FullRow"/>
            <Setter Property="HeadersVisibility" Value="Column"/>
            <Setter Property="MinColumnWidth" Value="0" />
            <Setter Property="MaxColumnWidth" Value="700" />
            <Setter Property="CanUserReorderColumns" Value="False" />
            <Setter Property="SelectionMode" Value="Single" />
            <Setter Property="CellStyle">
                <Setter.Value>
                    <Style TargetType="DataGridCell">
                        <Style.Triggers>
                            <Trigger Property="DataGridCell.IsSelected" Value="true">
                                <Setter Property="Background" Value="#6A78B0" />
                                <Setter Property="Foreground" Value="#FFFF97"/>
                                <Setter Property="BorderBrush" Value="#6A78B0" />
                            </Trigger>
                        </Style.Triggers>
                    </Style>
                </Setter.Value>
            </Setter>
            <Setter Property="ColumnHeaderStyle">
                <Setter.Value>
                    <Style TargetType="DataGridColumnHeader">
                        <Setter Property="HorizontalContentAlignment" Value="Left" />
                        <Setter Property="Height" Value="30" />
                        <Setter Property="Padding" Value="5" />
                    </Style>
                </Setter.Value>
            </Setter>
        </Style>

C# инициализация грида

Код


        #region Инициализация грида
        public void ReInitializeGrid()
        {
            if (!Properties.Settings.Default.AccessibleDataBase)
                return;

            try
            {
                using (SqlConnection connection = new SqlConnection(Properties.Settings.Default.ConnectDatabaseString))
                {
                    SqlCommand command = new SqlCommand("select * from view_acts", connection);

                    connection.Open();
                    SqlDataReader reader = command.ExecuteReader();
                    _dataSource.Clear();
                    _dataSource.Load(reader);
                    reader.Close();
                    connection.Close();

                    Binding bind = new Binding();
                    dataGrid.DataContext = _dataSource;
                    dataGrid.SetBinding(DataGrid.ItemsSourceProperty, bind);
                }
            }
            catch { }
        }
        #endregion

Вот как-то так...