[英]Extending A Custom Sort With A Custom Comparer
我有一個自定義排序,用於對列表進行排序,效果很好
public static void Sort<T>(ref List<T> list, string propertyName, SortDirection direction)
{
var comparer = new CustomComparer();
list = direction == SortDirection.Ascending
? list.OrderBy(x => x.GetType().GetProperty(propertyName).GetValue(x, null)).ToList()
: list.OrderByDescending(x => x.GetType().GetProperty(propertyName).GetValue(x, null)).ToList();
}
現在,我試圖將CustomComparer添加到混合中,並且在擴展方法時出現錯誤。
無法從用法中推斷方法“ IOrderedEnumerable System.Linq.Enumerable.OrderBy(此IEnumerable,Func,IComparer)”的類型參數。 嘗試顯式指定類型參數。
public static void Sort<T>(ref List<T> list, string propertyName, SortDirection direction)
{
list = direction == SortDirection.Ascending
? list.OrderBy(x => x.GetType().GetProperty(propertyName).GetValue(x, null), new CustomComparer()).ToList()
: list.OrderByDescending(x => x.GetType().GetProperty(propertyName).GetValue(x, null), new CustomComparer()).ToList();
}
我得到的OrderBy設置不正確,有人有任何建議嗎?
謝謝。
public class CustomComparer : IComparer<object>
{
public int Compare(object x, object y)
{
}
}
在OrderByDescending
方法中顯式指定類型參數<T, object>
。
public class MyComparer : IComparer<object>
{
public int Compare(object x, object y)
{
throw new NotImplementedException();
}
}
public static void Sort<T>(ref List<T> list, string propertyName)
{
list = list.OrderByDescending<T, object>(x => x.GetType().GetProperty(propertyName).GetValue(x, null), new MyComparer()).ToList();
}
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