将中位数方法添加到列表 [英] Add a Median Method to a List
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问题描述
我想在C#中重写List对象,以便添加诸如Sum或Average的Median方法.我已经找到了这个功能:
I would like to override the List object in C# in order to add a Median method like Sum or Average. I already found this function:
public static decimal GetMedian(int[] array)
{
int[] tempArray = array;
int count = tempArray.Length;
Array.Sort(tempArray);
decimal medianValue = 0;
if (count % 2 == 0)
{
// count is even, need to get the middle two elements, add them together, then divide by 2
int middleElement1 = tempArray[(count / 2) - 1];
int middleElement2 = tempArray[(count / 2)];
medianValue = (middleElement1 + middleElement2) / 2;
}
else
{
// count is odd, simply get the middle element.
medianValue = tempArray[(count / 2)];
}
return medianValue;
}
你能告诉我怎么做吗?
推荐答案
使用扩展方法,并复制输入的数组/列表.
Use an extension method, and make a copy of the inputted array/list.
public static decimal GetMedian(this IEnumerable<int> source)
{
// Create a copy of the input, and sort the copy
int[] temp = source.ToArray();
Array.Sort(temp);
int count = temp.Length;
if (count == 0)
{
throw new InvalidOperationException("Empty collection");
}
else if (count % 2 == 0)
{
// count is even, average two middle elements
int a = temp[count / 2 - 1];
int b = temp[count / 2];
return (a + b) / 2m;
}
else
{
// count is odd, return the middle element
return temp[count / 2];
}
}
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