备份一个个人用的WPF万能转换器

    public class CommonCoverter : IValueConverter
    {
        /// 转换器参数语法: key1,value1 key2,value2 ...   [other,defultValue] [object>bool]
        ///               -----------1----------------   -------2----------- ------3------
        /// 1:必填,为键值对,用空格分隔,不限键值对个数
        /// 2:选填,如果你想要1转成true,其他转成false: 1,true other,false ;也可以1和2转成true,其他转成flase: 1,true 2,true other,false
        /// 3:选填,像DataTrigger的value是object类型的,  如果用了此转换器需要手动指定转换类型. 例如  object>visibility 1,visible 2,hidden
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            #region 参数转dictionary
            string ObjectType = null;
            Dictionary<string, string> PStrDic = new Dictionary<string, string>();
            object result = null;
            var PStr = parameter as string ?? "";
            if (!((value is DateTime) && targetType == typeof(string)))
            {
                if (targetType == typeof(object) && Regex.IsMatch(PStr, @"object\>(\w+)"))
                    ObjectType = Regex.Match(PStr, @"object\>(\w+)").Groups[].Value;
                foreach (Match m in Regex.Matches(PStr, @"\w+\,[^\s]+"))
                {
                    var p_key = Regex.Match(m.Value, @"^\w+").Value;
                    var p_value = Regex.Match(m.Value, @"(?<=\,)[^\s]+$").Value;
                    PStrDic.Add(p_key, p_value);
                }
            }
            #endregion

            // to visibility
            if (targetType == typeof(Visibility) || targetType == typeof(Visibility?) || ObjectType == "visibility")
            {
                if (PStrDic.ContainsKey(value.ToString().ToLower()))
                {
                    var temp = PStrDic[value.ToString().ToLower()].ToLower();
                    Visibility visibilityResult = Visibility.Collapsed;
                    switch (temp)
                    {
                        case "visible":
                            visibilityResult = Visibility.Visible; break;
                        case "hidden":
                            visibilityResult = Visibility.Hidden; break;
                        case "collapsed":
                            visibilityResult = Visibility.Collapsed; break;
                        default:
                            break;
                    }

                    return visibilityResult;
                }
                else
                {
                    result = PStrDic.Any(t => t.Key.ToLower() == "other") ? PStrDic.Single(t => t.Key.ToLower() == "other").Value : (object)Visibility.Collapsed;

                }
            }
            // to int
            if (targetType == typeof(int) || targetType == typeof(int?) || ObjectType == "int")
            {
                if (PStrDic.ContainsKey(value.ToString().ToLower()))
                {
                    var temp = PStrDic[value.ToString().ToLower()].ToLower();
                    result = int.Parse(temp);
                }
                else
                {
                    result = PStrDic.Any(t => t.Key.ToLower() == "other") ? PStrDic.Single(t => t.Key.ToLower() == "other").Value : (object);
                }
            }
            // to bool
            if (targetType == typeof(bool?) || targetType == typeof(bool) || ObjectType == "bool")
            {
                if (PStrDic.ContainsKey(value.ToString().ToLower()))
                {
                    var temp = PStrDic[value.ToString().ToLower()].ToLower();
                    result = bool.Parse(temp);
                }
                else
                {
                    result = PStrDic.Any(t => t.Key.ToLower() == "other") ? PStrDic.Single(t => t.Key.ToLower() == "other").Value : (object)false;
                }
            }
            // to string
            if (targetType == typeof(string) || ObjectType == "string" || value?.GetType()?.IsEnum == true)
            {
                if (PStrDic.ContainsKey(value.ToString()) )
                {
                    var temp = PStrDic[value.ToString()];
                    result = temp;
                }
                else
                {
                    result = PStrDic.Any(t => t.Key.ToLower() == "other") ? PStrDic.Single(t => t.Key.ToLower() == "other").Value : (object)"";
                }
            }
            //datetime
            if (targetType == typeof(string) && (value is DateTime))
            {
                var dt = (DateTime)value;
                if (dt == DateTime.MinValue)
                {
                    result = "";
                }
                else
                {
                    result = PStrDic.Any(t => t.Key.ToLower() == "other") ? PStrDic.Single(t => t.Key.ToLower() == "other").Value : (object)dt;
                }
            }

            return result ?? Binding.DoNothing;

        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return Binding.DoNothing;
        }
    }

使用示例1

<DataTrigger Binding="{Binding MainIndex,ConverterParameter='object>bool 2,true other,false',Converter={StaticResource comct}}" Value="true">
    <Setter Property="Background" Value="#33FFA500"/>
    <Setter Property="CornerRadius" Value="3"/>
</DataTrigger>

使用示例2

<a Visibility="{Binding  MainIndex, ConverterParameter='1,visible',Converter={StaticResource comct}}"/>
<a Visibility="{Binding  MainIndex, ConverterParameter='2,visible',Converter={StaticResource comct}}"/>
<a Visibility="{Binding  MainIndex, ConverterParameter='3,visible',Converter={StaticResource comct}}"/>
<a Visibility="{Binding  MainIndex, ConverterParameter='4,visible',Converter={StaticResource comct}}"/>