c# – wpf datagridcheckboxcolumn：如何启用/禁用复选框

发布时间：2020-12-15 05:40:12 所属栏目：百科来源：网络整理

导读：我有一个DataGrid与DataGridCheckBoxColumn.网格具有与对象列表的绑定.我想要的是,如果选中了N个复选框,则取消选中已禁用,但我不知道如何执行禁用. DataGridCheckBoxColumn x:Name="IsFixedByBracketColumn" Header="Fissato con staffa" Binding="{Binding

我有一个DataGrid与DataGridCheckBoxColumn.网格具有与对象列表的绑定.我想要的是,如果选中了N个复选框,则取消选中已禁用,但我不知道如何执行禁用.

<DataGridCheckBoxColumn
    x:Name="IsFixedByBracketColumn"
    Header="Fissato con staffa"
    Binding="{Binding isFixedByBracket,UpdateSourceTrigger=PropertyChanged}"
    IsReadOnly="False">
    <DataGridCheckBoxColumn.ElementStyle>
        <Style TargetType="CheckBox">
            <Style.Triggers>
                <MultiDataTrigger>
                    <MultiDataTrigger.Conditions>
                        <Condition
                            Binding="{Binding
                                HasMaxNumberReached,RelativeSource={RelativeSource AncestorType={x:Type Window}}}"
                            Value="true"/>
                        <Condition
                            Binding="{Binding
                                IsChecked,RelativeSource={RelativeSource Self}}"
                            Value="false"/>
                    </MultiDataTrigger.Conditions>
                    <Setter Property="IsEnabled" Value="False"/>
                </MultiDataTrigger>
            </Style.Triggers>
            <EventSetter
                Event="CheckBox.Checked"
                Handler="DataGridCheckBoxColumn_Checked" />
        </Style>
    </DataGridCheckBoxColumn.ElementStyle>                                        
</DataGridCheckBoxColumn>

活动代码：

private void DataGridCheckBoxColumn_Checked(object sender,RoutedEventArgs e)
{
    CheckBox cb = (CheckBox)sender;
    if (cb.IsChecked == true)
    {
        this.numberOfCheckboxesChecked++;
    }
    else
    {
        this.numberOfCheckboxesChecked--;
    }

    if (this.numberOfCheckboxesChecked >= maxNumOfPointsPerSide)
    {               
        this.HasMaxNumberReached = true;
    }
    else 
    {
        this.HasMaxNumberReached = false; 
    }              
}

public bool HasMaxNumberReached
{
    get {
        return hasMaxNumberReached;
    }
    set { 
        hasMaxNumberReached = value; 
        RaisePropertyChanged("HasMaxNumberReached");
    }
}

解决方法

感谢MSDN论坛中的Magnus,以下是问题的正确答案：

<DataGrid x:Name="grid" AutoGenerateColumns="False">
        <DataGrid.Resources>
            <Style TargetType="CheckBox" x:Key="style">
                <Style.Triggers>
                    <MultiDataTrigger>
                        <MultiDataTrigger.Conditions>
                            <Condition Binding="{Binding HasMaxNumberReached,RelativeSource={RelativeSource AncestorType={x:Type Window}}}" Value="true"/>
                            <Condition Binding="{Binding IsChecked,RelativeSource={RelativeSource Self}}" Value="false"/>
                        </MultiDataTrigger.Conditions>
                        <Setter Property="IsEnabled" Value="False"/>
                    </MultiDataTrigger>
                </Style.Triggers>
                <EventSetter Event="CheckBox.Checked" Handler="DataGridCheckBoxColumn_Checked" />
                <EventSetter Event="CheckBox.Unchecked" Handler="DataGridCheckBoxColumn_Checked" />
            </Style>
        </DataGrid.Resources>
        <DataGrid.Columns>
        <DataGridCheckBoxColumn x:Name="IsFixedByBracketColumn"  Header="Fissato con staffa" 
                                Binding="{Binding isFixedByBracket,UpdateSourceTrigger=PropertyChanged}" IsReadOnly="False"
                                ElementStyle="{StaticResource style}" EditingElementStyle="{StaticResource style}">

        </DataGridCheckBoxColumn>
        </DataGrid.Columns>
    </DataGrid>

Here完整主题

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