File:ForEach method and foreach iteration of array.svg
From Wikimedia Commons, the free media repository
Jump to navigation
Jump to search
Size of this PNG preview of this SVG file: 500 × 369 pixels. Other resolutions: 320 × 236 pixels | 640 × 472 pixels | 1,024 × 756 pixels | 1,280 × 945 pixels | 2,560 × 1,889 pixels.
Original file (SVG file, nominally 500 × 369 pixels, file size: 113 KB)
File information
Structured data
Captions
Summary
[edit]DescriptionForEach method and foreach iteration of array.svg |
English: Processing time of ForEach method (and CopyTo method) and foreach iteration of array Class in C#, by DELL Vostro 200.
This shows that Foreach takes longer than foreach.
日本語:C#の配列で、ForEachメソッド(とCopyToメソッド)を使った場合と、foreachで繰り返しを行なった場合の処理時間(DELL Vostro 200を使用)。
Foreachのほうがforeachより時間がかかっていることがわかる。 |
Date | |
Source | Own work |
Author | aokomoriuta(青子守歌) |
Other versions |
Licensing
[edit]I, the copyright holder of this work, hereby publish it under the following licenses:
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported, 2.5 Generic, 2.0 Generic and 1.0 Generic license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
This file is licensed under the Creative Commons Attribution-Noncommercial 3.0 Unported license. | |
|
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
You may select the license of your choice.
C# source code
[edit]using System.Collections.Generic;
using System;
namespace LWisteria.Foreach
{
/// <summary>
/// Foreachの性能比較クラス
/// </summary>
static class Foreach
{
/// <summary>
/// エントリポイント
/// </summary>
/// <returns>終了コード</returns>
static int Main()
{
// ストップウォッチ
System.Diagnostics.Stopwatch stopwatch = new System.Diagnostics.Stopwatch();
// データ数
const int N = 10000000;
// 繰り返す回数
const int M = 100;
// 2倍ずつ計算
for(int n = 1; n < N; n *= 2)
{
// 計算するデータの生成
Sample[] samples = new Sample[n];
for(int i = 0; i < n; i++)
{
// 0, 1, 2...に10.5, 11.5, 12.5 ...を格納
samples[i] = new Sample() { Value = n + i };
}
// foreach
double sum1 = 0;
stopwatch.Reset();
stopwatch.Start();
foreach(Sample sample in samples)
{
for(int i = 0; i < M; i++)
{
sum1 += System.Math.Sqrt(sample.Value);
}
}
long time1 = stopwatch.ElapsedTicks;
// Array.Foreachメソッド
double sum2 = 0;
stopwatch.Reset();
stopwatch.Start();
Array.ForEach<Sample>(samples, (sample) =>
{
for(int i = 0; i < M; i++)
{
sum2 += System.Math.Sqrt(sample.Value);
}
});
long time2 = stopwatch.ElapsedTicks;
// 結果の表示
Console.WriteLine("{0}, {1}, {2}", n, time1, time2);
}
// 終了コードを返す
return Environment.ExitCode;
}
/// <summary>
/// サンプルクラス(参照型)
/// </summary>
sealed class Sample
{
/// <summary>
/// 値
/// </summary>
public double Value { set; get; }
}
}
}
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 02:45, 7 April 2010 | 500 × 369 (113 KB) | 青子守歌 (talk | contribs) | {{User:青子守歌/own work| |en = Processing time of ForEach method (and CopyTo method) and foreach iteration of array Class in C#, by [http://supportapj.dell.com/support/topics/topic.aspx/jp/shared/support/jp/product_support_ce |
You cannot overwrite this file.
File usage on Commons
The following page uses this file: