C# 中的排序列表替代方案

发布于 2024-07-25 23:32:25 字数 385 浏览 4 评论 0原文

我有许多对象，全部来自同一类（ColorNum）每个对象有 2 个成员变量（m_Color 和 m_Number）

示例：

ColorNum1(Red,25)
ColorNum2(Blue,5)
ColorNum3(Red,11)
ColorNum4(White,25)

这 4 个对象位于 ColorNumList

List<ColorNum> ColorNumList = new List<ColorNum>();

现在我想对列表进行排序，以便 mColor =“Red”的对象“位于顶部。我不关心其余对象的顺序。

我的谓词方法应该是什么样子？

原文

I have a number of objects, all from the same class(ColorNum) Each object has 2 member variabels (m_Color and m_Number)

Example:

ColorNum1(Red,25)
ColorNum2(Blue,5)
ColorNum3(Red,11)
ColorNum4(White,25)

The 4 objects are in the ColorNumList

List<ColorNum> ColorNumList = new List<ColorNum>();

Now I want to order the list so the objects with mColor = "Red" is in the top.
I dont care about the order of the remaining objects.

What should my predicate method look like?

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

云醉月微眠 2024-08-01 23:32:26

使用 linq：

var sortedRedAtTop = 
    from col in ColorNumList 
    order by col.Color == Red ? 1 : 2
    select col;

或列表的排序方法：

ColorNumList.Sort( (x,y) => 
    (x.Color == Red ? 1 : 2)-(y.Color == Red ? 1 : 2) );

Using linq:

var sortedRedAtTop = 
    from col in ColorNumList 
    order by col.Color == Red ? 1 : 2
    select col;

Or the list's sort method:

ColorNumList.Sort( (x,y) => 
    (x.Color == Red ? 1 : 2)-(y.Color == Red ? 1 : 2) );

回复收藏 0 原文

内心荒芜 2024-08-01 23:32:26

ColorNumList.Sort((x, y) => x.m_Color == Red ? 1 : (y.m_Color == Red ? -1 : 0));

ColorNumList.Sort((x, y) => x.m_Color == Red ? 1 : (y.m_Color == Red ? -1 : 0));

回复收藏 0 原文

尐偏执 2024-08-01 23:32:26

请参阅 http://msdn.microsoft。 com/en-us/library/system.array.sort(VS.71).aspx

[C#] public static void Sort(Array, Array, int, int, IComparer);

您需要实现一个函数来比较两个对象并返回一个值，该值指示一个对象是否小于、等于或大于另一个对象。

http://msdn.microsoft .com/en-us/library/system.collections.icomparer.compare(VS.71).aspx

您需要编写一个实现 IComparer 接口的类。

我没有使用过 C#，但这里是 VB 等效项：

Class ColorCompare
实现 IComparer

    Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer Implements System.Collections.IComparer.Compare
        Dim xc As ColorNum = TryCast(x, ColorNum)
        Dim yc As ColorNum = TryCast(y, ColorNum)
        If x.color = Red Then
            Return 1
        ElseIf y.color = Red Then
            Return -1
        Else
            Return 0
        End If
    End Function
End Class

See http://msdn.microsoft.com/en-us/library/system.array.sort(VS.71).aspx

[C#] public static void Sort(Array, Array, int, int, IComparer);

You need to implement a function that compares two objects and returns a value indicating whether one is less than, equal to or greater than the other.

http://msdn.microsoft.com/en-us/library/system.collections.icomparer.compare(VS.71).aspx

You need to write a class that implemenets the IComparer interface.

I haven't been using C#, but here is the VB equivalent:

Class ColorCompare
Implements IComparer

    Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer Implements System.Collections.IComparer.Compare
        Dim xc As ColorNum = TryCast(x, ColorNum)
        Dim yc As ColorNum = TryCast(y, ColorNum)
        If x.color = Red Then
            Return 1
        ElseIf y.color = Red Then
            Return -1
        Else
            Return 0
        End If
    End Function
End Class

回复收藏 0 原文

~没有更多了~