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颜色文本块取决于枚举值

textblock mvvm wpf c#

A.Pissicat · 技术社区 · 7 年前

我正在用MVVM模型研究WPF。

我有一个包含TexBlocks的视图。它显示有关ID的信息(来自文档和数据库):

<GroupBox Grid.Row="1" Grid.Column="0" Header="ID Informations">
    <StackPanel Orientation="Vertical">
        <TextBlock Text="DataBase surname: "/>
        <TextBlock Text="{Binding Model.Db_SURNAME}" FontWeight="Bold"/>
        <TextBlock Text="Document surname: "/>
        <TextBlock Text="{Binding Model.Dc_SURNAME}" FontWeight="Bold"/>
        <TextBlock Text="DataBase forename: "/>
        <TextBlock Text="{Binding Model.Db_FORENAME}" FontWeight="Bold"/>
        <TextBlock Text="Document forename: "/>
        <TextBlock Text="{Binding Model.Dc_FORENAME}" FontWeight="Bold"/>
    </StackPanel>
</GroupBox>

我有一个包含错误代码的枚举:

[Flags]
public enum errorID
{
    OK = 1<<0,
    SURNAME_DIFF = 1 << 1,
    FORENAME_DIFF = 1 << 2
}

我的模型是这样写的:

private String _db_SURNAME;
public String Db_SURNAME
{
    get { return _db_SURNAME; }
    set { SetProperty(ref _db_SURNAME, value); }
}
[...]

private errorID _errorID;
public errorID ErrorID
{
    get { return _errorID; }
    set { SetProperty(ref _errorID, value); }
}

我要两个文本块都显示 Model.Db_SURNAME 和 Model.Dc_SURNAME 当 ErrorID.HasFlag(errorID.SURNAME_DIFF ) . 也为了 Forname .

我该怎么办?

3 回复 | 直到 7 年前

A.Pissicat 7 年前

使用转换器将枚举转换为如下颜色:

public class ErrorIdColorConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if(!(value is errorID))
             throw new ArgumentException("value not of type errorID");
        if(!(parameteris errorID))
             throw new ArgumentException("parameter not of type errorID");

        errorID error = (errorID)value;
        errorID flag = (errorID)parameter;

        if (error.HasFlag(flag))
        {
            return Brushes.Red;
        }
        ...

        return Brushes.Black;
}

public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
   ....
}

}

然后,可以使用转换器将前景色绑定到枚举:

<TextBlock Text="{Binding Model.Db_SURNAME}" FontWeight="Bold" Foreground={Binding Model.errorId, Converter={StaticRessource errorIDColorConverter}, ConverterParameter={StaticRessource errorID.SURNAME_DIFF}}/>

Kacper Stachowski 7 年前

我建议你去 DataTrigger 对你 ErrorID 您的财产 Model .

尝试如下操作:

添加您的命名空间 enum 对你 View (Visual Studio将帮助您纠正错误)

<UserControl [some other namespaces] 
             xmlns:someName="clr-namespace:YourEnumNamespace;assembly=YourAssembly">

为您的 TextBox (您可以通过这样做一次为所有这些设置,或添加 x:Key 为每个对象显式引用样式 文本框 你想拥有它):

<UserControl.Resources>
    <Style TargetType="{x:Type TextBox}">
        <Style.Triggers>
            <DataTrigger Binding="{Binding [your property to bind]}" Value="{x:Static someName:ErrorID.[value of enum]}">
                <Setter Property="Foreground" Value="Green" />
            </DataTrigger>
        </Style.Triggers>
        <!-- repeat data triggers for each enum value you want to check !-->
    </Style>
</UserControl.Resources>

或者选择转换器,但我个人更喜欢这种方法。

如果一种方法 UserControl.Resources 不会为你工作,因为你不能这样捆绑,把它放在你的 TextBox.Style 你下面的标签 文本框 .

Antoine V 7 年前

最简单的解决方案:绑定 Foreground 颜色按值 ErrorID

XAML

<TextBlock Text="{Binding Model.Db_SURNAME}" FontWeight="Bold" Foreground={Binding SurNameColor}/>
<TextBlock Text="Document surname: "/>
<TextBlock Text="{Binding Model.Dc_SURNAME}" FontWeight="Bold" Foreground={Binding SurNameColor}/>

模型

private Brush _surNameColor = Brush.Black;
public Brush SurNameColor
{
    get { return _surNameColor; }
    set { SetProperty(ref _surNameColor, value); }
}
private errorID _errorID;
public errorID ErrorID
{
    get { return _errorID; }
    set { 
        if(ErrorID.HasFlag(errorID.SURNAME_DIFF))
            SurNameColor = Brushes.Red;
        SetProperty(ref _errorID, value); }
}