C＃如何将字典列表放入数组

Question

I have a method which accept params of Dictionary

static IDictionary<double, double> Merge(params Dictionary<double, double>[] dicts)
{
    return dicts.SelectMany(p => p).ToLookup(p => p.Key, p => p.Value)
                                   .ToDictionary(p => p.Key, p => p.Max());
}

I can use var r = Merge(r1,r2,r3); and it will work fine. r1,r2,r3 are dictionaries. The problem is I don't know the number of Dictionaries I have, it fluctuates , sometimes 3, sometimes 30, or 300. I have the dictionaries in a list. Actualy I have a list of a class. so somehow I have to make it work in a foreach loop?

List<Class1> c = new List<Class1>();

class Class1
    {
        public Dictionary<Double, Double> r1 = new Dictionary<Double, Double>();
    }

Answer 1

您有一个接受字典数组的方法，因此只需要将列表变成数组即可。

var result = Merge(listOfDictionaries.ToArray());

Answer 2

after the original question was edited, now a update that should fix your problem. The new function merge takes an IEnumerable of Class1 and merges it to a Dictionary . It uses the Merge(IEnumerable<Dictionary<double, double>> dicts) the is defined below:

 static Dictionary<Double, Double> Merge(IEnumerable<Class1> classes)
 {
     return Merge(classes.Select(c => c.r1));
 }

Original Answer :

a small change in your parameter type definition should do it

static IDictionary<double, double> Merge(IEnumerable<Dictionary<double, double>> dicts)
{
    return dicts.SelectMany(p => p)
        .ToLookup(p => p.Key, p => p.Value)
        .ToDictionary(p => p.Key, p => p.Max());
}

now you can just pass a list of dictionaries

EDIT If you want to use both variations, you can do this like this

static IDictionary<double, double> Merge(params Dictionary<double, double>[] dicts)
{
    return Merge((IEnumerable<Dictionary<double, double>>)dicts);
}