Question

如何循环使用Object类型的List？

List<object> countries = new List<object>();
countries.Add(new { Name = "United States", Abbr = "US" , Currency = "$"});
countries.Add(new { Name = "Canada", Abbr = "CA", Currency = "$" });
...more

我想在我的视图中使用（使用属性名称）

@model ViewModel
@foreach(object country in Model.Countries)
{
    Name = country.Name
    Code = country.Abbr
    Currency = country.Currency
}

更新：忘了提到我正在使用MVC，我想在View中循环数据。 States对象是ViewModel要查看的强类型属性之一。

更新：按要求更新以显示如何从控制器调用View -

[HttpPost]
public ActionResult Index(FormCollection form)
{
..some validations and some logic
ViewModel myViewModel = new ViewModel();
myViewModel.Countries = GetCountries(); -- this is where data get initialized
myViewModel.Data = db.GetData();
return PartialView("_myPartial", myViewModel);
}

Answer 1

var countries = new []{
        new { Name = "United States", Abbr = "US", Currency = "$" },
        new { Name = "Canada", Abbr = "CA", Currency = "$" }
    };

foreach(var country in countries)
{
      var Name = country.Name;
      .....
}

Answer 2

你也需要让国家匿名。

举个例子，像

var countries = (new[] {
    new { Name = "United States", Abbr = "US", Currency = "$" },
    new { Name = "Canada", Abbr = "CA", Currency = "$" },
 });
 List<string> names = new List<string>();
 countries.ToList().ForEach(x => { names.Add(x.Name); });

Answer 3

如果我理解得很好，您正在尝试将视图模型从控制器发送到视图。因此，如果您使用剃刀，您的代码应该是这样的

@model ViewModel
@foreach(object country in Model.countries)
{
  var Name = country.Name
  var Code = country.Abbr
  var Currency = country.Currency
}

注意关键字Model。

编辑

// Code inside your controller should be like this
ViewModel myModel = new ViewModel();
List<object> countries = new List<object>();
countries.Add(new { Name = "United States", Abbr = "US" , Currency = "$"});
countries.Add(new { Name = "Canada", Abbr = "CA", Currency = "$" });

myModel.countries = countries;

return View("yourView", myModel); // you can write just return View(myModel); if your view's name is the same as your action

希望它对你有所帮助。

Answer 4

我只想创建一个新类，并使用它而不是通用对象。是否有理由需要使用基础对象？如果需要更多抽象，您可以使用带有Where子句的匿名类型或使用抽象类。

Answer 5

您定义对象的方式将dynamic作为唯一选项：两个匿名类的类型不同。你应该写

foreach (dynamic country in countries) {
    ...
}

或使用命名类的实例初始化您的列表（这是首选，因为在您的情况下dynamic可能过重）。

Answer 6

如果你想以某种方式处理多态项（而不是匿名类型），请看一下Cast＆lt; ...＆gt; .ToList（）或OfType＆lt; ...＆gt; .ToList（）

迭代List <object> </object>

6 个答案: