Question

我的数据网格包含一些文本列，所有文本列的默认值为1.另外，我使用名为“save”的按钮来保存数据网格的文本列的值。我的要求是“保存”按钮只应在数据网格的文本列值发生变化时启用。请帮助我。

以下是我的代码： -

    View:-
x:Name="datagrid_range_targets" local:SetMinWidthToAutoAttachedBehaviour.SetMinWidthToAuto="true"
                  ItemsSource="{Binding RangeData, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" AutoGenerateColumns="False" 
                  Margin="0,5,5,0"  Loaded="OnUserControlLoaded" Unloaded="OnUserControlUnloaded" Style="{StaticResource style_data_grid}">
            <DataGrid.Resources>
                <Style x:Key="errorStyle" TargetType="{x:Type TextBox}">
                    <Setter Property="Padding" Value="-2"/>
                    <Style.Triggers>
                        <Trigger Property="Validation.HasError" Value="True">
                            <Setter Property="Background" Value="Red"/>
                            <Setter Property="ToolTip" 
                             Value="{Binding RelativeSource={RelativeSource Self},
                             Path=(Validation.Errors)[0].ErrorContent}"/>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </DataGrid.Resources>

            <DataGrid.Columns>
                <DataGridTextColumn x:Name="col_range_targets_range"
                                    Width="Auto"
                                    Binding="{Binding Name}"
                                    Header="Range" IsReadOnly="True" />

                <DataGridTextColumn x:Name="col_budget_report_year1"
                                    Width="Auto" 
                                    Header="Year 01" EditingElementStyle="{StaticResource errorStyle}">
                    <DataGridTextColumn.Binding>
                        <Binding Path="budgetReportYear1" Mode="TwoWay"
                                >
                            <Binding.ValidationRules>
                                <local:GreaterThanOrEqualLessThanOrEqual Max="99"
                                                                        Min=".0000001" />
                            </Binding.ValidationRules>
                        </Binding>
                    </DataGridTextColumn.Binding>
                </DataGridTextColumn>
                <DataGridTextColumn x:Name="col_budget_report_year2"
                                    Width="Auto" 
                                    Header="Year 02" EditingElementStyle="{StaticResource errorStyle}">
                    <DataGridTextColumn.Binding>
                        <Binding Path="budgetReportYear2" Mode="TwoWay"
                                 UpdateSourceTrigger="Default">
                            <Binding.ValidationRules>
                                <local:GreaterThanOrEqualLessThanOrEqual Max="99"
                                                                         Min="0.0000001" />
                            </Binding.ValidationRules>
                        </Binding>
                    </DataGridTextColumn.Binding>
                </DataGridTextColumn>

 <Button x:Name="Save"  Click="btn_Set_mulutiplier_Click" Content="Set multiplier" 
                                               Style="{StaticResource button_SetMultiplier}"  />




               View Model-
                    private double _budgetReportYear1 = 1;
    private double _budgetReportYear2 = 1; public double budgetReportYear1
    {
        get { return _budgetReportYear1; }
        set
        {
            _budgetReportYear1 = value;
            Onchanged("budgetReportYear1");
        }
    }


    public double budgetReportYear2
    {
        get { return _budgetReportYear2; }
        set
        {
            _budgetReportYear2 = value;
            Onchanged("budgetReportYear2");
        }
    }

Answer 1

向ViewModel添加属性：

private bool _columnModified = false;
public bool columnModified{
    get { return _columnModified; }
    set
    {
        _columnModified = value;
    }
}

将此添加到budgetReports setter：

columnModified = true;

在视图中设置按钮IsEnabled属性绑定到columnModified：

<Button Content="Save" IsEnabled="{Binding columnModified}"/>

保存完成后，您还必须将columnModified设置为false。

Answer 2

将绑定更改为

<Binding Path="budgetReportYear1" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged">

现在，当每次用户在文本框中键入时，属性都会更改。在内部设置器中，启用按钮为真，即

将保存按钮的IsEnabled绑定到bool属性并将其设置为true。在保存按钮单击时，将属性设置为false以重置按钮状态。

当数据网格的文本列的值更改时启用保存按钮

2 个答案: