IOrderedEnumerable<TElement>.CreateOrderedEnumerable<TKey> 方法

定义

命名空间:
System.Linq
程序集:
System.Core.dll, System.Linq.dll
程序集:
System.Core.dll
程序集:
System.Linq.dll
程序集:
netstandard.dll

根据键对元素 IOrderedEnumerable<TElement> 执行后续排序。

public:
generic <typename TKey>
 System::Linq::IOrderedEnumerable<TElement> ^ CreateOrderedEnumerable(Func<TElement, TKey> ^ keySelector, System::Collections::Generic::IComparer<TKey> ^ comparer, bool descending);
public System.Linq.IOrderedEnumerable<TElement> CreateOrderedEnumerable<TKey>(Func<TElement,TKey> keySelector, System.Collections.Generic.IComparer<TKey> comparer, bool descending);
public System.Linq.IOrderedEnumerable<out TElement> CreateOrderedEnumerable<TKey>(Func<out TElement,TKey> keySelector, System.Collections.Generic.IComparer<TKey> comparer, bool descending);
abstract member CreateOrderedEnumerable : Func<'Element, 'Key> * System.Collections.Generic.IComparer<'Key> * bool -> System.Linq.IOrderedEnumerable<'Element>
Public Function CreateOrderedEnumerable(Of TKey) (keySelector As Func(Of TElement, TKey), comparer As IComparer(Of TKey), descending As Boolean) As IOrderedEnumerable(Of TElement)
Public Function CreateOrderedEnumerable(Of TKey) (keySelector As Func(Of Out TElement, TKey), comparer As IComparer(Of TKey), descending As Boolean) As IOrderedEnumerable(Of Out TElement)

类型参数

TKey

由 keySelector. 生成的键的类型。

参数

keySelector
Func<TElement,TKey>

Func<T,TResult>用于提取每个元素的键。

comparer
IComparer<TKey>

IComparer<T>用于比较返回序列中放置的键。

descending
Boolean

true 按降序对元素进行排序; false 以升序对元素进行排序。

返回

IOrderedEnumerable<TElement>

IOrderedEnumerable<TElement>其元素根据键进行排序。

示例

下面的代码示例演示如何用于 CreateOrderedEnumerable 对某个项 IOrderedEnumerable<TElement>执行辅助排序。

// Create an array of strings to sort.
string[] fruits = { "apricot", "orange", "banana", "mango", "apple", "grape", "strawberry" };
// First sort the strings by their length.
IOrderedEnumerable<string> sortedFruits2 =
    fruits.OrderBy(fruit => fruit.Length);
// Secondarily sort the strings alphabetically, using the default comparer.
IOrderedEnumerable<string> sortedFruits3 =
    sortedFruits2.CreateOrderedEnumerable<string>(
        fruit => fruit,
        Comparer<string>.Default, false);

// Output the resulting sequence of strings.
foreach (string fruit in sortedFruits3)
    Console.WriteLine(fruit);

// This code produces the following output:
//
// apple
// grape
// mango
// banana
// orange
// apricot
// strawberry

' Create an array of strings to sort.
Dim fruits() As String = {"apricot", "orange", "banana", "mango", "apple", "grape", "strawberry"}
' First sort the strings by their length.
Dim sortedFruits2 As IOrderedEnumerable(Of String) = _
    fruits.OrderBy(Function(ByVal fruit) fruit.Length)
' Secondarily sort the strings alphabetically, using the default comparer.
Dim sortedFruits3 As IOrderedEnumerable(Of String) = _
    sortedFruits2.CreateOrderedEnumerable(Of String)( _
        Function(ByVal fruit) fruit, _
        System.Collections.Generic.Comparer(Of String).Default, _
        False)

Dim output As New System.Text.StringBuilder
' Output the resulting sequence of strings.
For Each fruit As String In sortedFruits3
    output.AppendLine(fruit)
Next

' Display the results.
MsgBox(output.ToString())

' This code produces the following output:
'
' apple
' grape
' mango
' banana
' orange
' apricot
' strawberry

注解

此方法提供ThenBy的功能与由或ThenByDescending提供的功能类似，具体取决于是descendingtrue还是false。 它们都执行已排序的类型的从属排序顺序 IOrderedEnumerable<TElement>。

适用于