asp.net-mvc 遍历集合并在 Razor 中打印索引和项目
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Iterate through collection and print Index and Item in Razor
提问by Rene
I'm having problems with my razor view. I have the following:
我的剃刀视图有问题。我有以下几点：
public ICollection<Topic> Topics
public class Topic
{
public string Description { get; set; }
}
I want to iterate through the collection and print out the results like this:
我想遍历集合并打印出这样的结果：
@foreach (int index in Enumerable.Range(0, Model.Topics.Count())){
<div>@(index). Model.Topics[@(index)].Description"</div>
}
The problem is that all I get is:
问题是我得到的只是：
0. Model.Topics[0].Description"
1. Model.Topics[1].Description"
I tried all kinds of things but still can't get the description out.
我尝试了各种方法，但仍然无法获得描述。
What am I doing wrong :-(
我究竟做错了什么 ：-（
回答by Darin Dimitrov
Try like this:
像这样尝试：
@foreach (var item in Model.Topics)
{
<div>@Model.Topics.IndexOf(item). @item.Description</div>
}
回答by gideon
This should work:
这应该有效：
@{int i = 0;}
@foreach (Topic tp in Model.Topics){
<div>@(i++).ToString() @tp.Description</div>
}
What your doing is trying to use the foreachlike a for loop. (Possibly like a C++ iterator?) The foreach is however syntactic sugar that does all that work for you.
您所做的是尝试使用foreachfor 循环之类的方法。（可能像 C++ 迭代器？）然而，foreach 是一种语法糖，可以为您完成所有工作。
In C# foreach loops over typed collections. So if you have :
在 C# 中 foreach 循环遍历类型化集合。所以如果你有：
int[] numbers = new int[] {1,2,3,4};
Person[] persons = //collection of persons
The loops would be:
循环将是：
foreach(int n in numbers) { /*n would be each of the numbers*/ }
foreach(Person p in persons)
{/* p here would refer to each person per iteration*/ }
Works for anything IEnumerable (which is IList, Arrays, Collections etc)
适用于任何 IEnumerable（即 IList、数组、集合等）
回答by Mikael Eliasson
Try:
尝试：
@foreach (int index in Enumerable.Range(0, Model.Topics.Count())){
<div>@(index). @Model.Topics[index].Description</div>
}
Or even better:
或者甚至更好：
@{ int i = 1; }
@foreach (var topic in Model.Topics){
<div>@(i++). @topic.Description</div>
}
