如何订购清单结果 <IDictionary> 对象使用Linq？

Question

Hi and thanks for looking!

Background

I have a workflow that constructs a set of dictionaries, each with identical KEYS, but (of course) various VALUES. After these dictionaries are constructed, they are added to a common list. I need to order that list based on a particular KEY in each dictionary.

I am using C#, .NET 4, LINQ, Lambdas, etc.

Question

How do I order a list of dictionaries based on a common key property in each dictionary? For example if I have the code below, how do I order based on the "Color" key?

IDictionary<String, object> item1 = new Dictionary<String, object>{"Color","Red"};
IDictionary<String, object> item2 = new Dictionary<String, object>{"Color","Blue"};
IDictionary<String, object> item3 = new Dictionary<String, object>{"Color","Green"};

var dictionaryList = new List<IDictionary<String, object>>();

dictionaryList.add(item1);
dictionaryList.add(item2);
dictionaryList.add(item3);

var orderedList = dictionaryList.OrderBy[??????];

Thanks!

Answer 1

除非我想念什么？

var orderedList = dictionaryList.OrderBy(d => d["Color"]);

Answer 2

You need to pass the OrderBy method a function that given a Dictionary<String, object> returns the item you wish to order by, so:

var orderedList = dictionaryList.OrderBy(d => d["Color"]);

Will suffice.

As an aside, you can clean up the initialisation a little bit like so:

var orderedList = new[] { item1, item2, item3 }.OrderBy(d => d["Color"]);

Answer 3

您正在寻找d => d["Color"] 。