c＃订购一个List <Dictionary<string,object> &gt;

Question

how to order a List<Dictionary<String,object>> the object contains only string

the dictionary is structured as below

[name: mario]
[surname: rossi]
[address: xxxxxx]
[age: 40]

i'd like to order the list of these dictionaries by "age" may you help me please?

i've tried with:

myList.Select(x => x.OrderBy(y=>y.Value)) 

it gives me this error: the value isn't a string(ok i aggree with him, it's an object, i've to cast in some way) but more important is that i can't tell to the "orderby" methods that it must order by age

Answer 1

You want something along the lines of

var sorted = myList.OrderBy(dict => Convert.ToInt32(dict["age"]));

I 've used Convert.ToInt32 defensively because there's a small chance you are using another data type for the age, and casting (unboxing) to the wrong type would throw an exception.

Answer 2

myList.Sort((x,y) => ((int)x["age"]).CompareTo((int)y["age"]));

or similar:

myList.Sort((x, y) => Comparer.Default.Compare(x["age"], y["age"]));

However! It would be much easier if you used a proper type instead of the dictionary; then it would just be:

myList.Sort((x,y) => x.Age.CompareTo(y.Age));