WPF学习笔记-DataGrid后台动态生成列，设置列样式并使用值转换器

一、后台动态生成DataGrid的列

HistoricalDataDG.Columns.Clear();
HistoricalDataDG.Columns.Add(new DataGridTextColumn() { Header = "时间", ElementStyle = (System.Windows.Style)FindResource("TbrqStyle"), IsReadOnly = true });
HistoricalDataDG.Columns.Add(new DataGridTextColumn() { Header = "T01(℃)", Binding = new Binding("T01"), ElementStyle = (System.Windows.Style)FindResource("dgCell_T01"), IsReadOnly = true});

在后台使用前台xaml里的style  使用FindResource()

二、设置列样式并使用值转换器

前台设置的样式代码

<UserControl.Resources>
        <ResourceDictionary>
            <root:DGColorConverter x:Key="DGColorConverter"/>

            <Style x:Key="TbrqStyle" TargetType="TextBlock">
                <Setter Property="Text" Value="{Binding Path=Tbrq,StringFormat='yyyy-MM-dd HH:mm:ss'}">
                </Setter>
            </Style>
            <Style x:Key="dgCell_T01" TargetType="TextBlock">
                <!-- 文本居中-->
                <Setter Property="TextAlignment" Value="Center"/>
                <!-- 根据其他列的值设置文本颜色-->
                <Setter Property="Foreground">
                    <Setter.Value>
                        <MultiBinding Converter="{StaticResource DGColorConverter}">
                            <Binding Path="T01"></Binding>
                            <Binding Path="High_Temperature"></Binding>
                            <Binding Path="Mim_Temperature"></Binding>
                        </MultiBinding>
                    </Setter.Value>
                </Setter>
            </Style>
        </ResourceDictionary>
</UserControl.Resources>

TbrqStyle设置时间显示格式为24小时制，在实际使用时发现后台不能设置Binding，否则显示格式无效

值转换器DGColorConverter

public class DGColorConverter : IMultiValueConverter
{
        /// 需传入一组对象，（基础值 比对值）
        public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (values[0] == DependencyProperty.UnsetValue)
            {
                return "";
            }
                
            float tvalue = float.Parse(values[0].ToString());
            float hvalue = float.Parse(values[1].ToString());
            float mvalue = float.Parse(values[2].ToString());
            if (tvalue > hvalue || tvalue < mvalue)
            {
                return new SolidColorBrush(Colors.Red);
            }
            else
            {
                return new SolidColorBrush(Colors.Black);
            }
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
}

通过与其他列的值进行比较，使当前列的文字显示不同颜色

参考

https://www.cnblogs.com/jameslif/archive/2013/07/24/3209955.html

https://www.cnblogs.com/woodenmancool/p/4268539.html?utm_source=tuicool&utm_medium=referral

http://www.cnblogs.com/lingboxingzi/archive/2012/05/09/2491478.html