Question

我是WPF的新手并且有点迷失。

我想在标签中显示Text，将其绑定到以下类：

class Status
{
  public string Message;
  public bool Success;
}

我希望标签在成功时以绿色显示“消息”，如果不成功则以红色显示。我不知道如何开始。

Answer 1

首先，您需要绑定到属性，而不是成员。您还应养成在您的课程中实施INotifyPropertyChanged的习惯。

public class Status : INotifyPropertyChanged
{
    private string message;
    public string Message
    {
        get { return this.message; }
        set
        {
            if (this.message == value)
                return;

            this.message = value;
            this.OnPropertyChanged("Message");
        }
    }

    private bool success;
    public bool Success
    {
        get { return this.success; }
        set
        {
            if (this.success == value)
                return;

            this.success = value;
            this.OnPropertyChanged("Success");
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected void OnPropertyChanged(string propertyName)
    {
        if (this.PropertyChanged != null)
            this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}

在绑定方面，您必须使用自定义IValueConverter

public class RGColorConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value == null)
            return null;

        bool success = (bool) value;
        return success ? Brushes.Green : Brushes.Red;
    }

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

使用文本和前景颜色绑定标签

1 个答案: