CODEWITHSUNDEEP
wpfxamldatagridwpfdatagrid
Álvaro García
Álvaro García

Reputation: 19356

Conditional binding in column of datagrid

I have a DataGrid which itemsSource is an ObservableCollection<MyType>. This type has this properties:

long ID;
long IDCategory;
long? IDState01;
long? IDEstate02;
long? IDEste03;

I have 3 categories, if it is category 1, IDState01 is not null and the others states are null. If category is 2, the IDState02 is not null and the others are null and son on.

I have a state column in my DataGrid, which value depends on the category. So I would like to binding to the correct property depending on the category, so if the category is 1, it would bind property state01, if the category is 3 it would bind property state02 and so on.

I think that my DataGrid would be something like that:

<DataGrid HorizontalAlignment="Stretch" Margin="5,5,5,5" VerticalAlignment="Stretch">
    <DataGrid.Columns>
        <DataGridTextColumn Header="State">
            <!--Something here, perhaps a datatrigger.-->
        </DateGridTextColumn>
    </DataGrid.Columns>
</DataGrid>

Thanks.

EDIT: I would like to do it in XAML if it is possible, instead of using a converter.

Upvotes: 1

Views: 3236

Answers (3)

mm8
mm8

Reputation: 169200

I would like to do it in XAML if it is possible ...

You could use a DataGridTemplateColumn:

<DataGridTemplateColumn Header="State">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <TextBlock>
                <TextBlock.Style>
                    <Style TargetType="TextBlock">
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding IDCategory}" Value="1">
                                <Setter Property="Text" Value="{Binding IDState01}" />
                            </DataTrigger>
                            <DataTrigger Binding="{Binding IDCategory}" Value="2">
                                <Setter Property="Text" Value="{Binding IDEstate02}" />
                            </DataTrigger>
                            <DataTrigger Binding="{Binding IDCategory}" Value="3">
                                <Setter Property="Text" Value="{Binding IDEste03}" />
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </TextBlock.Style>
            </TextBlock>
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
    <DataGridTemplateColumn.CellEditingTemplate>
        <DataTemplate>
            <TextBox>
                <TextBox.Style>
                    <Style TargetType="TextBox">
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding IDCategory}" Value="1">
                                <Setter Property="Text" Value="{Binding IDState01}" />
                            </DataTrigger>
                            <DataTrigger Binding="{Binding IDCategory}" Value="2">
                                <Setter Property="Text" Value="{Binding IDEstate02}" />
                            </DataTrigger>
                            <DataTrigger Binding="{Binding IDCategory}" Value="3">
                                <Setter Property="Text" Value="{Binding IDEste03}" />
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </TextBox.Style>
            </TextBox>
        </DataTemplate>
    </DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>

Upvotes: 2

Luk&#225;š Koten
Luk&#225;š Koten

Reputation: 1253

I think you will need own DataTemplate for each category and DataTemplateSelector to assign DataTemplates based on category type.

Upvotes: -1

ASh
ASh

Reputation: 35681

introduce a property which will get/set the correct state based on category:

public long? State
{
    get 
    { 
        if (IDCategory == 1) return IDState01; 
        if (IDCategory == 2) return IDState02; 
        return null;
    }
    set 
    { 
        if (IDCategory == 1) IDState01 = value; 
        else if (IDCategory == 2) IDState02 = value; 
    }
}

in DataGird bind column to a new property:

<DataGridTextColumn Header="State" Binding="{Binding State}"/>

Upvotes: 2

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