Question

我正在寻求结合两个具有相似代码但变量类型不同的函数。我想在IEnumerable中使用T类型，但它似乎不起作用。

方法1：

public static IList<ListItem> AppendTopMakesToList(this IEnumerable<ListItem> options,bool appendSeparatorRow = true)
        {
            if (options == null || string.IsNullOrEmpty(Sitecore.Configuration.Settings.GetSetting("RACQ.JoinMembership.Top10CarMakes"))) return options.ToList();
            var topmakes = Sitecore.Configuration.Settings.GetSetting("RACQ.JoinMembership.Top10CarMakes").Split('|').ToList().ConvertAll(d => d.ToLower());
            var filteredMakes = options.Where(x => topmakes.Any(y => y.Contains(x.Text.ToLower()))).ToList();//getting all the makes from the listItems
            if (appendSeparatorRow)
            {
                var separatorListItem = new ListItem("------------------", "------------------", false);
                separatorListItem.Attributes.Add("disabled", "true"); //disabling the separator item so that it can't be selected
                filteredMakes.Add(separatorListItem);
            }
            var items = options.ToList();
            items.InsertRange(0, filteredMakes);
            return items;
        }

方法2：

public static IList<Make> AppendTopMakesToList(this IEnumerable<Make> options, bool appendSeparatorRow = true)
        {
            if (options == null || string.IsNullOrEmpty(Sitecore.Configuration.Settings.GetSetting("RACQ.JoinMembership.Top10CarMakes"))) return options.ToList();
            var topmakes = Sitecore.Configuration.Settings.GetSetting("RACQ.JoinMembership.Top10CarMakes").Split('|').ToList().ConvertAll(d => d.ToLower());
            var filteredMakes = options.Where(x => topmakes.Any(y => y.Contains(x.Code.ToLower()))).ToList();//getting all the makes from the listItems
            if (appendSeparatorRow)
            {
                var separatorListItem = new Make()
                {
                    Code = "------------------",
                    Description = "------------------"

                };
                filteredMakes.Add(separatorListItem);
            }
            var items = options.ToList();
            items.InsertRange(0, filteredMakes);
            return items;
        }

这些函数的作用与返回类型IList和IList完全相同，后者是通过IEnumberable和IEnumberable的参数类型传递的。

Answer 1

我会做类似的事情：

public static IList<T> AppendItems<T>(this IEnumerable<T> options, Action<T> blankFactory, bool appendSeparatorRow = true)
        {
            if (options == null || string.IsNullOrEmpty(Sitecore.Configuration.Settings.GetSetting("RACQ.JoinMembership.Top10CarMakes"))) return options.ToList();
            var topmakes = Sitecore.Configuration.Settings.GetSetting("RACQ.JoinMembership.Top10CarMakes").Split('|').ToList().ConvertAll(d => d.ToLower());
            var filteredMakes = options.Where(x => topmakes.Any(y => y.Contains(x.Code.ToLower()))).ToList();//getting all the makes from the listItems
            if (appendSeparatorRow)
            {
                var separatorListItem = blankFactory();
                filteredMakes.Add(separatorListItem);
            }
            var items = options.ToList();
            items.InsertRange(0, filteredMakes);
            return items;
        }

然后您可以像这样使用它：

var whatever = new List<ListItem>():


AppendItems(whatever, () => {
                var separatorListItem = new ListItem("------------------", "------------------", false);
                separatorListItem.Attributes.Add("disabled", "true");
    return separatorListItem;

}, true);

使用IEnumberable <T>的模板制作通用方法

1 个答案: