C＃如何编写可用作GetAverageAge（students，s => s.age）的函数体
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说我有几个不同类的ObservableCollections：
public class Employee
{
public int age { get; set; }
}
public class Student
{
public int age { get; set; }
}
ObservableCollection<Employee> employees = ...;
ObservableCollection<Student> students = ...;
int employeeAveAge = GetAverageAge(employees, e => e.age);
int studentAveAge = GetAverageAge(students, s => s.age);
没有找到相关结果
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5 个回复
程琶
public int GetAverageAge<T>(IEnumerable<T> list, Func<T,int> ageFunc) { int accum = 0; int counter = 0; foreach(T item in list) { accum += ageFunc(item); counter++; } return accum/counter; }方法：public int GetAverageAge<T>(IEnumerable<T> list, Func<T,int> ageFunc) { return (int)list.Average(ageFunc); }捅瓶啡
编辑： 将返回值和强制类型转换添加到int（平均返回双精度）。辰炔诚薯
double GetAverageAge<T>(IEnumerable<T> persons, Func<T, int> propertyAccessor) { double acc = 0.0; int count = 0; foreach (var person in persons) { acc += propertyAccessor(person); ++count; } return acc / count; }掀辟髓观粟
渴翅吮斡撤
I Would do it this way for a normal list not sure about observable collection : List<Employee> employees = new List<Employee> { new Employee{age = 12}, new Employee{age = 14}}; Func<List<Employee>, int> func2 = (b) => GetAverageAge(b); private static int GetAverageAge(List<Employee> employees) { return employees.Select(employee => employee.age).Average; //Thats quicker i guess :) }