在WPF MVVM中更新UI时如何更改文本颜色

时间:2016-11-03 20:23:08

标签: c# wpf xaml mvvm

我有以下XAML

<UserControl x:Class="DomainExperience.Pane.DomainFile.DomainAnalysisPaneResultsControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:domainExperience="clr-namespace:DomainExperience"
             xmlns:domainFile="clr-namespace:DomainExperience.Pane.DomainFile"
             Background="{DynamicResource VsBrush.Window}"
             Foreground="{DynamicResource VsBrush.WindowText}"
             mc:Ignorable="d"
             d:DesignHeight="300" d:DesignWidth="300"
             Name="MyToolWindow">

    <UserControl.Resources>
        <domainFile:StatusColoredDataTemplateClass x:Key="StatusColoredDataTemplate" />
    </UserControl.Resources>    

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"></RowDefinition>
        </Grid.RowDefinitions>

        <ListView Grid.Row="0" ItemsSource="{Binding Path=Results}">

            <ListView.View>
                <GridView>
                    <GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}"/>
                    <GridViewColumn Header="Status" DisplayMemberBinding="{Binding Status}" CellTemplateSelector="{DynamicResource StatusColoredDataTemplate}"/>
                </GridView>
            </ListView.View>
        </ListView>
    </Grid>
</UserControl>

然后,我创建了以下类

using System.Windows;
using System.Windows.Controls;

namespace DomainExperience.Pane.DomainFile
{
    public class StatusColoredDataTemplateClass : DataTemplateSelector
    {
        public override DataTemplate SelectTemplate(object item, DependencyObject container)
        {
            // Some logic here that I haven't defined yet...
        }
    }
}

此处的目的是根据内容更改进入“状态”列的文本的颜色。我希望结果为Passed时为绿色文本,为失败时为红色文本。

我已经读过我应该创建一个实现DataTemplateSelector的类。但是,只要与此XAML相关的Panel得到更新,我就无法在此类中遇到断点。

  1. 我的XAML逻辑出了什么问题?
  2. 我的ViewModel逻辑上是否遗漏了其他内容?
  3. 我需要在课堂上实现哪种代码才能更改文本的颜色?
  4. 谢谢!

    更新:结果属性与以下类

    相关联
    public class ResourceStaticAnalysisResults
        {
            public string Name { get; set; }
            public List<string> ErrorList { get; set; }
            public string Status { get; set; }
        }
    

1 个答案:

答案 0 :(得分:3)

DataTemplateSelector过度,因为您不需要更改DataTemplate本身,只需更改其中一个控件的属性即可。相反,您可以为该列定义单个固定DataTemplate并使用样式管理颜色更改:

<DataTemplate x:Key="StatusColoredDataTemplate" DataType="{x:Type system:Boolean}">
    <TextBlock Text="{Binding}">
        <TextBlock.Style>
            <Style TargetType="{x:Type TextBlock}">
                <Setter Property="Foreground" Value="Green" />
                <Style.Triggers>
                    <DataTrigger Binding="{Binding}" Value="False">
                        <Setter Property="Foreground" Value="Red" />
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </TextBlock.Style>
    </TextBlock>
</DataTemplate>

专栏:

<GridViewColumn
    Header="Status"
    DisplayMemberBinding="{Binding Status}"
    CellTemplate="{StaticResource StatusColoredDataTemplate}" />