如何满足某个数据条件，如何使DataGrid的Cell背景动画？

问题描述

我有一个从数据库填充的WPF DataGrid。有一个细胞给我一个计数。如果它的值大于0，我想为该单元格添加一个闪烁的背景颜色。感谢您帮助我解决问题。

解决方案

p>创建一个转换器，检查一个单元格是否包含大于0的数字：

 命名空间MyApp 
 {
 public class GreaterThanZeroConverter：IValueConverter 
 {
 public object Convert（object value，Type targetType，
 object parameter，CultureInfo culture）
 {
 int cellValue ; 
 return Int32.TryParse（（string）value，out cellValue）&& cellValue> 0; 
 
 
 public object ConvertBack（object value，Type targetType，
 object parameter，CultureInfo culture）
 {
 return false; 
} 
} 
} 
  

将转换器名称空间包含在xaml。将 MyApp 替换为转换器的命名空间：

  xmlns：myApp = clr-namespace：MyApp
  

您的网格必须看起来像这样。我绑定的对象有2个属性：Col1和Col2。如果Col1的值大于0，该单元格将闪烁红色。

 < DataGrid ItemsSource ={Binding List} AutoGenerateColumns =False> 
< DataGrid.Resources> 
< myApp：GreaterThanZeroConverter 
 x：Key =GreaterThanZeroConverter> 
< / myApp：GreaterThanZeroConverter> 
< Style TargetType =DataGridCellx：Key =FlashStyle> 
< Style.Triggers> 
< DataTrigger 
 Binding ={Binding Col1，
 Converter = {StaticResource GreaterThanZeroConverter}}
 Value =True> 
< DataTrigger.EnterActions> 
< BeginStoryboard> 
< Storyboard 
 x：Name =Blink
 AutoReverse =True
 RepeatBehavior =Forever> 
< ColorAnimationUsingKeyFrames 
 BeginTime =00:00:00
 Storyboard.TargetProperty =（Background）。（SolidColorBrush.Color）> 
< EasingColorKeyFrame 
 KeyTime =00:00:01
 Value =Red/> 
< / ColorAnimationUsingKeyFrames> 
< / Storyboard> 
< / BeginStoryboard> 
< /DataTrigger.EnterActions> 
< / DataTrigger> 
< /Style.Triggers> 
< / Style> 
< /DataGrid.Resources> 
< DataGrid.Columns> 
< DataGridTextColumn 
 Binding ={Binding Col1}
 CellStyle ={StaticResource FlashStyle}>< / DataGridTextColumn> 
< DataGridTextColumn 
 Binding ={Binding Col2}>< / DataGridTextColumn> 
< /DataGrid.Columns> 
< / DataGrid> 
  

编辑

如果你必须多栏中的单元格基于它们包含的内容闪烁，可以更改

 < DataTrigger 
 Binding ={Binding Col1，
 Converter = {StaticResource GreaterThanZeroConverter}}
 Value =True> 
 ... 
  

至

 < DataTrigger 
 Binding ={Binding 
 Content.Text，
 RelativeSource = {RelativeSource Self}，
 Converter = {StaticResource GreaterThanZeroConverter}}
 Value =True> 
  

并将您要闪烁的每个列的CellStyle设置为FlashStyle：

 < DataGrid.Columns> 
< DataGridTextColumn 
 Binding ={Binding Col1}
 CellStyle ={StaticResource FlashStyle}>< / DataGridTextColumn> 
< DataGridTextColumn 
 Binding ={Binding Col2}
 CellStyle ={StaticResource FlashStyle}>< / DataGridTextColumn> 
< /DataGrid.Columns> 
  

请注意，这可能只适用于DataGridTextColumns。如果您正在使用DataGridTemplateColumns，将会更棘手一点。

I have a WPF DataGrid which is populated from a database. There is a cell which gives me a count. I want to add a flashing Background color to that cell if its value is more than 0. Thanks for helping me with my problem.

解决方案

Create a converter that will check to see if a cell contains a number greater than 0:

namespace MyApp
{
    public class GreaterThanZeroConverter : IValueConverter
    {
        public object Convert(object value, Type targetType,
            object parameter, CultureInfo culture)
        {
            int cellValue;
            return Int32.TryParse((string)value, out cellValue) && cellValue > 0;
        }

        public object ConvertBack(object value, Type targetType,
            object parameter, CultureInfo culture)
        {
            return false;
        }
    }
}

Include your converter namespace in the xaml. Replace MyApp with the namespace of your converter:

xmlns:myApp="clr-namespace:MyApp"

Your grid will have to look something like this. The objects I am binding to have 2 properties: Col1 and Col2. If the value of Col1 is greater than 0, that cell will flash red.

<DataGrid ItemsSource="{Binding List}" AutoGenerateColumns="False">
    <DataGrid.Resources>
        <myApp:GreaterThanZeroConverter 
            x:Key="GreaterThanZeroConverter">
        </myApp:GreaterThanZeroConverter>
        <Style TargetType="DataGridCell" x:Key="FlashStyle">
            <Style.Triggers>
                <DataTrigger 
                    Binding="{Binding Col1, 
                    Converter={StaticResource GreaterThanZeroConverter}}" 
                    Value="True" >
                    <DataTrigger.EnterActions>
                        <BeginStoryboard>
                            <Storyboard 
                                x:Name="Blink" 
                                AutoReverse="True" 
                                RepeatBehavior="Forever">
                                <ColorAnimationUsingKeyFrames 
                                    BeginTime="00:00:00"
                                    Storyboard.TargetProperty="(Background).(SolidColorBrush.Color)">
                                    <EasingColorKeyFrame 
                                        KeyTime="00:00:01" 
                                        Value="Red" />
                                </ColorAnimationUsingKeyFrames>
                            </Storyboard>
                        </BeginStoryboard>
                    </DataTrigger.EnterActions>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </DataGrid.Resources>
    <DataGrid.Columns>
        <DataGridTextColumn 
            Binding="{Binding Col1}" 
            CellStyle="{StaticResource FlashStyle}"></DataGridTextColumn>
        <DataGridTextColumn 
            Binding="{Binding Col2}"></DataGridTextColumn>
    </DataGrid.Columns>
</DataGrid>

Edit

If you have to make cells in multiple columns blink based on what they contain, you can change

<DataTrigger 
    Binding="{Binding Col1, 
    Converter={StaticResource GreaterThanZeroConverter}}" 
    Value="True" >
  ...

To

<DataTrigger 
    Binding="{Binding 
        Content.Text,
        RelativeSource={RelativeSource Self},
        Converter={StaticResource GreaterThanZeroConverter}}" 
    Value="True" >

And set the CellStyle for each of the columns that you want to blink to our FlashStyle:

<DataGrid.Columns>
    <DataGridTextColumn 
        Binding="{Binding Col1}" 
        CellStyle="{StaticResource FlashStyle}"></DataGridTextColumn>
    <DataGridTextColumn 
        Binding="{Binding Col2}"
        CellStyle="{StaticResource FlashStyle}"></DataGridTextColumn>
</DataGrid.Columns>

Note that this will probably only work with DataGridTextColumns. If you are using DataGridTemplateColumns it will be a bit more tricky.

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