Enumerable.Repeat<TResult>(TResult, Int32) 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
產生包含一個重複值的序列。
public:
generic <typename TResult>
static System::Collections::Generic::IEnumerable<TResult> ^ Repeat(TResult element, int count);public static System.Collections.Generic.IEnumerable<TResult> Repeat<TResult>(TResult element, int count);static member Repeat : 'Result * int -> seq<'Result>Public Function Repeat(Of TResult) (element As TResult, count As Integer) As IEnumerable(Of TResult)類型參數
- TResult
結果序列中要重複的值類型。
參數
- element
- TResult
價值要重複。
- count
- Int32
在產生的序列中重複該數值的次數。
傳回
IEnumerable<TResult>
一個 IEnumerable<T> 包含重複值的 。
例外狀況
count 小於0。
範例
以下程式碼範例示範如何用 Repeat 來產生重複值的序列。
IEnumerable<string> strings =
Enumerable.Repeat("I like programming.", 15);
foreach (String str in strings)
{
Console.WriteLine(str);
}
/*
This code produces the following output:
I like programming.
I like programming.
I like programming.
I like programming.
I like programming.
I like programming.
I like programming.
I like programming.
I like programming.
I like programming.
I like programming.
I like programming.
I like programming.
I like programming.
I like programming.
*/
' Repeat the same string to create a sequence.
Dim sentences As IEnumerable(Of String) =
Enumerable.Repeat("I like programming.", 15)
Dim output As New System.Text.StringBuilder
For Each sentence As String In sentences
output.AppendLine(sentence)
Next
' Display the output.
Console.WriteLine(output.ToString())
' This code produces the following output:
'
' I like programming.
' I like programming.
' I like programming.
' I like programming.
' I like programming.
' I like programming.
' I like programming.
' I like programming.
' I like programming.
' I like programming.
' I like programming.
' I like programming.
' I like programming.
' I like programming.
' I like programming.
備註
此方法透過延遲執行實現。 立即回傳值是一個物件，儲存執行動作所需的所有資訊。 此方法所代表的查詢，直到物件被枚舉，無論是直接呼叫其 GetEnumerator 方法，或是使用 C# 中的 foreach，或在 Visual Basic 中使用 For Each，才會執行。
