語言

Enumerable.ToList<TSource>(IEnumerable<TSource>) 方法

定義

從 List<T>建立 IEnumerable<T>。

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static System::Collections::Generic::List<TSource> ^ ToList(System::Collections::Generic::IEnumerable<TSource> ^ source);
public static System.Collections.Generic.List<TSource> ToList<TSource>(this System.Collections.Generic.IEnumerable<TSource> source);
static member ToList : seq<'Source> -> System.Collections.Generic.List<'Source>
<Extension()>
Public Function ToList(Of TSource) (source As IEnumerable(Of TSource)) As List(Of TSource)

類型參數

TSource

元素 source的類型。

參數

source
IEnumerable<TSource>

要 IEnumerable<T> 創造一個 List<T> 來源。

傳回

List<TSource>

包含輸入序列元素的 A List<T> 。

例外狀況

source 是 null。

範例

以下程式碼範例示範如何強制 ToList 立即查詢評估並回傳包含查詢結果的 a List<T> 。

string[] fruits = { "apple", "passionfruit", "banana", "mango",
                      "orange", "blueberry", "grape", "strawberry" };

List<int> lengths = fruits.Select(fruit => fruit.Length).ToList();

foreach (int length in lengths)
{
    Console.WriteLine(length);
}

/*
 This code produces the following output:

 5
 12
 6
 5
 6
 9
 5
 10
*/
' Create an array of strings.
Dim fruits() As String =
{"apple", "passionfruit", "banana", "mango",
 "orange", "blueberry", "grape", "strawberry"}

' Project the length of each string and
' put the length values into a List object.
Dim lengths As List(Of Integer) =
fruits _
.Select(Function(fruit) fruit.Length) _
.ToList()

' Display the results.
Dim output As New System.Text.StringBuilder
For Each length As Integer In lengths
    output.AppendLine(length)
Next
Console.WriteLine(output.ToString())

' This code produces the following output:
'
' 5
' 12
' 6
' 5
' 6
' 9
' 5
' 10

備註

此 ToList<TSource>(IEnumerable<TSource>) 方法強制立即查詢評估,並回傳包含查詢結果的 a List<T> 。 你可以將此方法附加到查詢中,以取得查詢結果的快取副本。

ToArray 有類似行為,但回傳的是陣列而非 List<T>。

適用於