WPF : How to disable some items in a Datagrid combobox column for some specific cells?

Question

I have a datagrid combobox column and the dropdown has a few items.
On some specific cells in the same column , I need some items in dropdown to be disabled.
Thanks in advance ! :)

Answer 1

I made a sample for your question base on my understanding, here is the code.
XAML code:

 <Window.Resources>  
        <Style TargetType="{x:Type ComboBoxItem}">  
            <Setter Property="Template">  
                <Setter.Value>  
                    <ControlTemplate TargetType="{x:Type ComboBoxItem}">  
                        <Border x:Name="Border" SnapsToDevicePixels="true" IsHitTestVisible="{Binding IsBool}">  
                            <TextBlock Text="{Binding ItemName}" IsHitTestVisible="{Binding IsBool}" >  
                                <TextBlock.Style>  
                                    <Style TargetType="TextBlock">  
                                        <Style.Triggers>  
                                            <Trigger Property="IsHitTestVisible" Value="false">  
                                                <Setter Property="Background" Value="lightgray"></Setter>  
                                            </Trigger>  
                                            <Trigger Property="IsMouseOver" Value="True">  
                                                <Setter Property="Background" Value="#FFCBE3FE"></Setter>  
                                            </Trigger>  
                                        </Style.Triggers>  
                                    </Style>  
                                </TextBlock.Style>  
                            </TextBlock>  
                        </Border>  
                    </ControlTemplate>  
                      
                </Setter.Value>  
            </Setter>  
        </Style>  
    </Window.Resources>  
    <StackPanel>  
        <DataGrid Name="dg" AutoGenerateColumns="False">  
            <DataGrid.Columns>  
                <DataGridTextColumn Header="Name" Width="80" Binding="{Binding Name}"/>  
                <DataGridComboBoxColumn Header="colm" DisplayMemberPath="ItemName" Width="120">  
                    <DataGridComboBoxColumn.ElementStyle>  
                        <Style TargetType="{x:Type ComboBox}">  
                            <Setter Property="IsReadOnly" Value="{Binding IsUpdate}" />  
                            <Setter Property="ItemsSource" Value="{Binding Models}" />  
                            <Setter Property="SelectedIndex" Value="0"></Setter>  
                            <Style.Triggers>  
                                <Trigger Property="IsReadOnly" Value="True">  
                                    <Setter Property="Foreground" Value="LightCyan"></Setter>  
                                    <Setter Property="IsEnabled" Value="False"></Setter>  
                                    <Setter Property="IsHitTestVisible" Value="False"></Setter>  
                                </Trigger>  
                            </Style.Triggers>  
                        </Style>  
                    </DataGridComboBoxColumn.ElementStyle>  
                    <DataGridComboBoxColumn.EditingElementStyle>  
                        <Style TargetType="{x:Type ComboBox}">  
                            <Setter Property="IsReadOnly" Value="{Binding IsUpdate}" />  
                            <Setter Property="SelectedIndex" Value="0"></Setter>  
                            <Setter Property="ItemsSource" Value="{Binding Models}" />  
                            <Style.Triggers>  
                                <Trigger Property="IsReadOnly" Value="True">  
                                    <Setter Property="Foreground" Value="lightgray"></Setter>  
                                    <Setter Property="IsEnabled" Value="False"></Setter>  
                                    <Setter Property="IsHitTestVisible" Value="False"></Setter>  
                                </Trigger>  
                            </Style.Triggers>  
                        </Style>  
                    </DataGridComboBoxColumn.EditingElementStyle>  
                </DataGridComboBoxColumn>  
            </DataGrid.Columns>  
        </DataGrid>  
        
    </StackPanel>  

C# code is:

   public partial class MainWindow : Window  
    {  
        public MainWindow()  
        {  
            InitializeComponent();  
            List<Model> models1 = new List<Model>()  
            {  
                new Model(){ItemName="Item1",IsBool=true},  
                new Model(){ItemName="Item2",IsBool=false},  
                new Model(){ItemName="Item3",IsBool=false},  
                new Model(){ItemName="Item4",IsBool=true},  
                new Model(){ItemName="Item5",IsBool=true},  
            };  
  
            List<Model> models2= new List<Model>()  
            {  
                new Model(){ItemName="Item11",IsBool=true},  
                new Model(){ItemName="Item22",IsBool=true},  
                new Model(){ItemName="Item33",IsBool=false},  
                new Model(){ItemName="Item55",IsBool=false},  
                new Model(){ItemName="Item44",IsBool=false},  
            };  
  
            List<Person> people = new List<Person>()  
            {  
                new Person(){Name="Jack",IsUpdate="True",Models = models1},  
                new Person(){Name="Hohn",IsUpdate="False", Models = models2},  
                new Person(){Name="John",IsUpdate="False", Models = models2},  
            };  
            dg.ItemsSource = people;  
        }  
    }  
  
    public class Person  
    {  
        public string Name { get; set; }  
  
        public string IsUpdate { get; set; }  
        public List<Model> Models { get; set; }  
    }  
  
    public class Model  
    {  
        public string ItemName { get; set; }  
        public bool IsBool { get; set; }  
    }  

Result picture is:

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