如何循环遍历列表<T>并抓住每件物品？

Question

How can I loop through a List and grab each item?

I want the output to look like this:

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

Here is my code:

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

Alternatively, because it is a List<T> .. which implements an indexer method [] , you can use a normal for loop as well.. although its less readble (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

Just like any other collection. With the addition of the List<T>.ForEach method.

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

This is how I would write using more functional way . Here is the code:

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

The low level iterator manipulate code:

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);
    }
}

Answer 6

Try this

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

// We can loop over list items with foreach.

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

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

// This will cause an enter code here exception.

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

Answer 7

You can also do it using the while loop

   int ctr = 0;
   while (ctr <= myMoney.Count - 1)
   {
       var data = myMoney[ctr];
       Console.WriteLine($"{data.amount} - {data.type}");
       ctr++;
   }