无法使用 ICollection.ToList()

Question

我想在这里打电话给 ToList():

using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;

namespace CSVStuff
{
    public static class CSVContentGenerator
    {
        public static string GetContent(IOrderedDictionary headingsPropertiesMapping)
        {
            var propertyNames = headingsPropertiesMapping.Keys.ToList(); //ICollection does not contain a definition for ToList()
            //var propertyNames = new List<object>(headingsPropertiesMapping.Keys); //Cannot convert from ICollection to int
            return "";
        }
    }
}

为什么这些不起作用？

Answer 1

试试这个：

var propertyNames = headingsPropertiesMapping.Keys.Cast<T>().ToList();

and type T 是字典键的类型。

无法使用 ICollection.ToList()

Unable to use ICollection.ToList()

c#

.net

linq

.net-4.5

icollection