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C#: foreach
迭代序列元素; wait foreach 讀取非同步序列。
簡單範例 (Example.cs)
請將此範例另存為 Example.cs,並與本頁其他範例分開執行。
Example.cs:
// PROJECT-EXAMPLE
string[] names = ["ore", "wood"];
foreach (string name in names) System.Console.WriteLine(name);
結果:
ore
wood
句法
foreach (var item in items) { ... }
例1:基本形式
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
public static class Program
{
public static async Task Main(string[] args)
{
string[] names = ["ore", "wood"];
foreach (string name in names) Console.WriteLine(name);
}
}
例2:另一種實用形式
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
public static class Program
{
public static async Task Main(string[] args)
{
Dictionary<string, int> counts = new() { ["ore"] = 5, ["wood"] = 3 };
foreach (var (name, count) in counts) Console.WriteLine($"{name}={count}");
}
}
官方來源:Microsoft學習。