WPF值转换器

效果 文本绑定颜色

首先实现一个颜色转换器类 继承IValueConvert接口

class ColorValueConvert : IValueConverter
    {        #region Field 字段        #endregion

        #region Constructor 构造函数        #endregion

        #region Property 属性        #endregion

        #region Event 事件        #endregion

        #region Method 方法        #endregion
        /// 
        /// 颜色转换器        /// 
        /// 
        /// 
        /// 
        /// 
        /// 
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {            var colorString = value.ToString().Split(new char[] { ':' })[1].Trim();//颜色文本;
            var flag = System.Convert.ToBoolean(parameter);//确是否转换
            if (flag)
            {                switch (colorString)
                {                    case "红色":                        return Brushes.Red;                    case "绿色":                        return Brushes.Green;                    case "蓝色":                        return Brushes.Blue;                    case "紫色":                        return Brushes.Violet;                    default:                        return Brushes.Transparent;
                }
            }            return null;
        }        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {            throw new NotImplementedException();
        }
    }

在界面中引用转换器

xmlns:convert="clr-namespace:值转换器"

创建资源

使用

 <StackPanel VerticalAlignment="Center" Orientation="Vertical"><ComboBox x:Name="cbox"
                      Width="300"
                      SelectedIndex="0"
                      Margin="10"><ComboBoxItem Content="红色" /><ComboBoxItem Content="绿色" /><ComboBoxItem Content="蓝色" /><ComboBoxItem Content="紫色" /><Rectangle Width="200"
                       Height="200"
                       Fill="{Binding ElementName=cbox, Path=SelectedItem, Converter={StaticResource colorConvert}, ConverterParameter=True}" />

界面完整代码

<Window x:Class="值转换器.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:convert="clr-namespace:值转换器"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:local="clr-namespace:值转换器"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        Title="MainWindow"
        Width="800"
        Height="450"
        mc:Ignorable="d"><convert:ColorValueConvert x:Key="colorConvert" /><StackPanel VerticalAlignment="Center" Orientation="Vertical"><ComboBox x:Name="cbox"
                      Width="300"
                      SelectedIndex="0"
                      Margin="10"><ComboBoxItem Content="红色" /><ComboBoxItem Content="绿色" /><ComboBoxItem Content="蓝色" /><ComboBoxItem Content="紫色" /><Rectangle Width="200"
                       Height="200"
                       Fill="{Binding ElementName=cbox, Path=SelectedItem, Converter={StaticResource colorConvert}, ConverterParameter=True}" />