我有一个SolidColorBrush类型的对象并且它成立 一个SolidColorBrush。
现在我有一个我的dataGrid的转换器,它绑定到一个列表。 此dataGrid中的每一行都将由我拥有的转换器着色。
一切正常,但我怎么能返回我的SolidColorBrush对象而不是静态的“Brushes.Red”。
我的转换器:
[ValueConversion(typeof(MainWindow.eErrorLevel), typeof(Brush))]
public class TypeToColourConverter : IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
MainWindow.eErrorLevel errorLevel = (MainWindow.eErrorLevel)value;
switch (errorLevel)
{
case MainWindow.eErrorLevel.Information:
return Brushes.Red;
case MainWindow.eErrorLevel.Warning:
return Brushes.Yellow;
case MainWindow.eErrorLevel.Error:
return Brushes.Red;
}
return Brushes.Gray;
}
public object ConvertBack(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
throw new NotSupportedException();
}
#endregion
}
我的转换器不在MainWindow中,如果这很重要的话 我的MainWindow中的SolidColorBrush对象是公共的:
public CurrentColor CurrentColors = new CurrentColor();
public class CurrentColor
{
public SolidColorBrush ERROR { get; set; }
public SolidColorBrush WARNING { get; set; }
public SolidColorBrush INFORMATION { get; set; }
}
编辑:我的画笔可以由用户自己动态设置
EDIT2:现在正在努力工作:)
答案 0 :(得分:1)
假设这些颜色在运行时不会发生变化,您可以将画笔声明为转换器上方的资源,并为每个画笔添加转换器的属性,如下所示:
将您的转换器修改为:
[ValueConversion(typeof(MainWindow.eErrorLevel), typeof(Brush))]
public class TypeToColourConverter : IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
MainWindow.eErrorLevel errorLevel = (MainWindow.eErrorLevel)value;
switch (errorLevel)
{
case MainWindow.eErrorLevel.Information:
return Error;
case MainWindow.eErrorLevel.Warning:
return Warning;
case MainWindow.eErrorLevel.Error:
return Information;
}
return Normal;
}
public object ConvertBack(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
throw new NotSupportedException();
}
#endregion
public Brush Normal { get; set; }
public Brush Error { get; set; }
public Brush Warning { get; set; }
public Brush Information { get; set; }
}
修改您的XAML(无论您添加转换器的位置):
<SolidColorBrush x:Key="Normal" Color="#FFAAAAAA"/>
<SolidColorBrush x:Key="Error" Color="#FFFF0000"/>
<SolidColorBrush x:Key="Warning" Color="#FF00FF00"/>
<SolidColorBrush x:Key="Information" Color="#FF0000FF"/>
<local:TypeToColourConverter x:Key="TypeToColourConverter" Normal="{StaticResource Normal}" Error="{StaticResource Error}" Warning="{StaticResource Warning}" Information="{StaticResource Information}" />
这是非常“设计师友好的”#39; (即所有这些颜色可以在Blend中更改)并且易于维护。
希望它有所帮助。
答案 1 :(得分:0)
就像我在评论中所说,这是一个例子,将其作为转换器参数传递,可能有其他选择:
<强> XAML 强>
<div id="Rss">
<div class="Rss-Title"></div>
<div class="Rss-Author"></div>
<div class="Rss-Description"></div>
</div>
代码隐藏
<Window x:Class="WpfApplicationTestColorConverter.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApplicationTestColorConverter"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<local:ErrorColors x:Key="Colors" />
<local:TypeToColourConverter x:Key="ColorConverter" />
</Window.Resources>
<Grid>
<ListBox x:Name="ListBox1" ItemsSource="{Binding MyObjects}">
<ListBox.ItemTemplate>
<DataTemplate>
<TextBlock
Text="{Binding Title}"
Background="{Binding ErrorLevel,
Converter={StaticResource ColorConverter},
ConverterParameter={StaticResource Colors}}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
</Window>
转换器
public partial class MainWindow : Window
{
public ObservableCollection<MyObject> MyObjects { get; } = new ObservableCollection<MyObject>();
public MainWindow()
{
InitializeComponent();
DataContext = this;
// find the (static)resource
var colors = (ErrorColors)FindResource("Colors");
colors.ERROR = new SolidColorBrush(Colors.Red);
colors.WARNING = new SolidColorBrush(Colors.Orange);
colors.INFORMATION = new SolidColorBrush(Colors.Lime);
// Add objects to the list
MyObjects.Add(new MyObject { Title = "This is an error", ErrorLevel = ErrorLevel.Error });
MyObjects.Add(new MyObject { Title = "This is a warning", ErrorLevel = ErrorLevel.Warning });
MyObjects.Add(new MyObject { Title = "This is information", ErrorLevel = ErrorLevel.Information });
}
}
[ValueConversion(typeof(ErrorLevel), typeof(Brush))]
public class TypeToColourConverter : IValueConverter
{
#region IValueConverter Members
public object Convert(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
if (!(value is ErrorLevel))
return Brushes.Gray;
if (!(parameter is ErrorColors))
return Brushes.Gray;
var lvl = (ErrorLevel)value;
var currentColor = (ErrorColors)parameter;
switch (lvl)
{
case ErrorLevel.Information:
return currentColor.INFORMATION;
case ErrorLevel.Warning:
return currentColor.WARNING;
case ErrorLevel.Error:
return currentColor.ERROR;
}
return Brushes.Gray;
}
public object ConvertBack(object value, Type targetType, object parameter,
System.Globalization.CultureInfo culture)
{
throw new NotSupportedException();
}
#endregion
}
public class ErrorColors
{
public SolidColorBrush ERROR { get; set; }
public SolidColorBrush WARNING { get; set; }
public SolidColorBrush INFORMATION { get; set; }
}
public enum ErrorLevel
{
Error,
Warning,
Information
}
结果: