ShrlAlgoToolkit/ShrlAlgo.Toolkit.Mvvm/Converters/ComparisonConverter.cs

using System.Globalization;
using System.Windows.Data;

namespace ShrlAlgo.Toolkit.Mvvm.Converters;

public class ComparisonConverter : IValueConverter
{
	/// <summary>
	/// 模型属性到控件属性
	/// </summary>
	/// <param name="value"></param>
	/// <param name="targetType"></param>
	/// <param name="parameter"></param>
	/// <param name="culture"></param>
	/// <returns></returns>
	public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
	{
		//value:ViewModel属性，枚举/数字/字符串
		//parameter：ConverterParameter，枚举/数字/字符串
		//return (string)parameter == (string)value;
		//绑定的枚举属性与控件转换参数一致则选中
		return value.Equals(parameter);
		//return (string)parameter == (string)value;
	}

	/// <summary>
	/// 控件选中，将Converter参数传给模型属性
	/// </summary>
	/// <param name="value"></param>
	/// <param name="targetType"></param>
	/// <param name="parameter"></param>
	/// <param name="culture"></param>
	/// <returns></returns>
	public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
	{
		//value:bool 比如RadioButton的check属性
		//parameter:ConverterParameter枚举
		//一样才传递给ViewModel
		//选中则返回枚举类
		return value is true ? parameter : Binding.DoNothing;
		//return (bool)value ? parameter : Binding.DoNothing;
	}
}