Tôi có một cái ListView，我使用 TextWriter 的实现将输出重定向到如下:

ScriptEngine pyEngine;
pyEngine.Runtime.IO.RedirectToConsole();
Console.SetOut(TextWriter.Synchronized(new ListViewWriter(lbIpyOutput, Dispatcher)));

我想实现一个基于枚举值的 ListView item 的彩色背景。

在此处的大多数示例中，DataBinding 用于类的属性。对我来说，颜色不依赖于任何属性，而是依赖于 Enum。 Atm 我使用一种方法来格式化输出。

public static void WriteToConsole(string _stringToWrite)  
{
    string output = String.Format("PY | {0} | {1} | {2}", tagCount, DateTime.Now, _stringToWrite);   
    Console.WriteLine(output);
    tagCount++;
}

ListViewWriter Đúng TextWriter

class ListViewWriter : TextWriter
    {
        private ListView listView;

        public ListViewWriter(ListView _listBox, Dispatcher _dispatcher)
        {
            listView = _listBox;
        }

        public override void WriteLine(string value)
        {
            base.WriteLine(value);
            listView.Items.Add(value.ToString());
        }
    }

由于 DataBinding 似乎不是我想做的覆盖 Console.WriteLine(String _stringToWrite, MyEnum enum) 的选项，但这显然行不通因为 TextWriter 发现“没有合适的方法来覆盖”。

我也创建了一个转换器类，但不知道如何使用(不确定是否真的可以将十六进制值用作字符串):

class OutputBackgroundConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            Severity severity = (Severity)value;
            string bgColor = "Gray";

            switch (severity)
            {
                case Severity.CRITIC:
                    bgColor = "27ae60"; //carrot orange
                    phá vỡ;
                case Severity.DEBUG:
                    bgColor = "3498db"; //peter river blue
                    phá vỡ;
                case Severity.ERROR:
                    bgColor = "e74c3c"; //alizarin red
                    phá vỡ;
                case Severity.MESSAGE:
                    bgColor = "95a5a6"; //concrete grey
                    phá vỡ;
                case Severity.WARNING:
                    bgColor = "9b59b6"; //amethyst purple
                    phá vỡ;
            }

            return bgColor;
        }

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

如果有人能帮助我，那就太好了。我真的不知道如何解决这个问题，而且我对 WPF 还很陌生。

网络版本:4.5.1

编辑1枚举仅用于内部日志记录，如下所示:

enum Severity{CRITIC, WARNING, DEBUG, MESSAGE, ERROR};

1 Câu trả lời

我认为这应该对你有用，但如果你有任何问题，请告诉我。

忘记重写 WriteLine 函数。只需将它封装在您自己的可以处理枚举参数的函数中，然后像以前一样调用基本功能。

每次添加新项目时，我添加的部分都会更改 ListView 中最后一项的背景颜色。

Mới WriteLineWithEnum 函数:

public void WriteLineWithEnum(string value, Severity severity)
{
    ListViewItem item = new ListViewItem();
        item.Content = value.ToString();
        SolidColorBrush bgColorBrush = OutputBackgroundConverter.Convert(severity);
        item.Background = bgColorBrush;
        myListView.Items.Add(item);
}

然后增强您的 Convert 函数，返回一个 SolidColorBrush 对象，该对象在上面用于更改 ListViewItem 的背景颜色。请注意，我将其设为静态并取消了“IValueConverter”继承。如果需要/您可以将它们添加回去。

Mới转换函数:

class OutputBackgroundConverter
{
    public static SolidColorBrush Convert(Severity severity)
    {
        string bgColor = "d3d3d3"; //Gray;

        switch (severity)
        {
            case Severity.CRITIC:
                bgColor = "27ae60"; //carrot orange
                phá vỡ;
            case Severity.DEBUG:
                bgColor = "3498db"; //peter river blue
                phá vỡ;
            case Severity.ERROR:
                bgColor = "e74c3c"; //alizarin red
                phá vỡ;
            case Severity.MESSAGE:
                bgColor = "95a5a6"; //concrete grey
                phá vỡ;
            case Severity.WARNING:
                bgColor = "9b59b6"; //amethyst purple
                phá vỡ;
        }

        SolidColorBrush brush = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#" + bgColor));

        return brush;
    }

}

我制作了一个快速演示应用程序来概括这个想法。代码和结果如下。

主窗口.xaml:

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    
        
        
    

主窗口.xaml.cs:

using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;

namespace WpfApplication2
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            System.Random rand = new System.Random();

            for (int i = 0; i < 10; i++)
            {
                int randInt = rand.Next(100, 1000);
                string randStr = randInt.ToString();
                this.AddListViewItem(randStr, (Severity)(i % 5)); //5 is number of Severities
            }
        }

        public void AddListViewItem(string value, Severity severity)
        {
            ListViewItem item = new ListViewItem();
            item.Content = value.ToString();
            SolidColorBrush bgColorBrush = OutputBackgroundConverter.Convert(severity);
            item.Background = bgColorBrush;
            myListView.Items.Add(item);
        }
    }

    public enum Severity
    {
        CRITIC = 0,
        DEBUG = 1,
        ERROR = 2,
        MESSAGE = 3,
        WARNING = 4,
    }

    class OutputBackgroundConverter
    {
        public static SolidColorBrush Convert(Severity severity)
        {
            string bgColor = "d3d3d3"; //Gray;

            switch (severity)
            {
                case Severity.CRITIC:
                    bgColor = "27ae60"; //carrot orange
                    phá vỡ;
                case Severity.DEBUG:
                    bgColor = "3498db"; //peter river blue
                    phá vỡ;
                case Severity.ERROR:
                    bgColor = "e74c3c"; //alizarin red
                    phá vỡ;
                case Severity.MESSAGE:
                    bgColor = "95a5a6"; //concrete grey
                    phá vỡ;
                case Severity.WARNING:
                    bgColor = "9b59b6"; //amethyst purple
                    phá vỡ;
            }

            SolidColorBrush brush = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#" + bgColor));

            return brush;
        }

    }
}

kết quả:

再一次，如果这不能解决问题，请告诉我，我会尝试修复它。谢谢!

关于c# - 根据 TextWriter 输入 wpf 为 ListView 分配背景颜色，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39167284/