Question

我需要在我的项目中实现一个特定的排序机制。

上下文：最终用户希望在可用时首先看到一些项目。

private List<string> SpecialSort(string[] all, string[] pref)
{
    //I want to return my total collection: sorted like specified in my prefered order.
    return all.ToList(); // But now in the correct order!
}

[TestMethod]
public void TestSpecialSort()
{
    //Arrange
    var myTotalColllection = new[] { "foo", "bar", "baz", "qux", "corge", "waldo", "thud" };
    var myPreferedOrder = new[] { "waldo", "absint", "foo", "baz" };

    //Act
    var result = SpecialSort(myTotalColllection, myPreferedOrder);

    //Assert
    var expectedResult = (new[] { "waldo", "foo", "baz", "bar", "qux", "corge", "thud" }).ToList();
    Assert.IsTrue(result.SequenceEqual(expectedResult));
}

我不知道.NET框架中存在这种排序功能，如果确实存在请赐教。

Answer 1

向后迭代myPreferedOrder，将all中找到的每一个移到第一位。

private List<string> SpecialSort(string[] all, string[] pref)
{
    List<string> listed = all.ToList();
    foreach (string s in pref.Reverse())
        if (listed.Contains(s))
        {
            listed.Remove(s);
            listed.Insert(0, s);
        }
    return listed;
}

Answer 2

你可以试试这个

var result = myTotalColllection
    .OrderBy(x => Array.IndexOf(myPreferedOrder, x)<0?int.MaxValue: Array.IndexOf(myPreferedOrder, x))
    .ToArray();

如何实现特定的排序？

2 个答案: