Question

如何循环浏览列表并抓取每个项目？

我希望输出看起来像这样：

Console.WriteLine("amount is {0}, and type is {1}", myMoney.amount, myMoney.type);

这是我的代码：

static void Main(string[] args)
{
    List<Money> myMoney = new List<Money> 
    {
        new Money{amount = 10, type = "US"},
        new Money{amount = 20, type = "US"}
    };
}

class Money
{
    public int amount { get; set; }
    public string type { get; set; }
}

Answer 1

foreach：

foreach (var money in myMoney) {
    Console.WriteLine("Amount is {0} and type is {1}", money.amount, money.type);
}

MSDN Link

或者，因为它是List<T> ..它实现了索引器方法[]，所以你也可以使用普通的for循环......虽然它的可读性较低（IMO）：

for (var i = 0; i < myMoney.Count; i++) {
    Console.WriteLine("Amount is {0} and type is {1}", myMoney[i].amount, myMoney[i].type);
}

Answer 2

为了完整起见，还有LINQ / Lambda方式：

myMoney.ForEach((theMoney) => Console.WriteLine("amount is {0}, and type is {1}", theMoney.amount, theMoney.type));

Answer 3

就像其他任何系列一样。添加List<T>.ForEach方法。

foreach (var item in myMoney)
    Console.WriteLine("amount is {0}, and type is {1}", item.amount, item.type);

for (int i = 0; i < myMoney.Count; i++)
    Console.WriteLine("amount is {0}, and type is {1}", myMoney[i].amount, myMoney[i].type);

myMoney.ForEach(item => Console.WriteLine("amount is {0}, and type is {1}", item.amount, item.type));

Answer 4

这是我用更多functional way写的方式。这是代码：

new List<Money>()
{
     new Money() { Amount = 10, Type = "US"},
     new Money() { Amount = 20, Type = "US"}
}
.ForEach(money =>
{
    Console.WriteLine($"amount is {money.Amount}, and type is {money.Type}");
});

Answer 5

尝试一下

List<int> mylist = new List<int>();   
mylist.Add(10);  
mylist.Add(100);   
mylist.Add(-1);

//我们可以使用foreach遍历列表项。

foreach (int value in mylist )       
{       
 Console.WriteLine(value);       
}

Console.WriteLine("::DONE WITH PART 1::");

//这将导致enter code here异常。

foreach (int value in mylist )     
{         
 list.Add(0);      
}

Answer 6

低级 iterator 操作代码：

List<Money> myMoney = new List<Money>
{
    new Money{amount = 10, type = "US"},
    new Money{amount = 20, type = "US"}
};
using (var enumerator = myMoney.GetEnumerator())
{
    while (enumerator.MoveNext())
    {
        var element = enumerator.Current;
        Console.WriteLine(element.amount);
    }
}

如何遍历List <t>并抓取每个项目？</t>

6 个答案: