我已经编写了以下代码来查找丢失的序列,但我收到了错误,正如我所提到的,这是我的代码
public partial class Missing : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
List<int> daysOfMonth =
new List<int>() { 6, 2, 4, 1, 9, 7, 3, 10, 15, 19, 11, 18, 13, 22, 24, 20, 27, 31, 25, 28 };
Response.Write("List of days:");
foreach (var num in daysOfMonth)
{
Response.Write(num);
}
Response.Write("nnMissing days are: ");
// Calling the Extension Method in the List of type int
foreach (var number in daysOfMonth.FindMissing()){Response.Write(number);}
}
public static IEnumerable<int> FindMissing(this List<int> list)
{
// Sorting the list
list.Sort();
// First number of the list
var firstNumber = list.First();
// Last number of the list
var lastNumber = list.Last();
// Range that contains all numbers in the interval
// [ firstNumber, lastNumber ]
var range = Enumerable.Range(firstNumber, lastNumber - firstNumber);
// Getting the set difference
var missingNumbers = range.Except(list);
return missingNumbers;
}
}
我得到的错误如下Extension method must be defined in a non-generic static class
任何人都能帮助我
由于错误状态,扩展方法只能在非泛型静态类上声明。您正试图在Missing
类中声明FindMissing
方法,该类不是非泛型静态类。
你有两个选择:
- 使该方法成为普通方法,在这种情况下,它可以保留在
Missing
类中 - 声明另一个类,可能是
MissingExtensions
,以包含该方法
这就是第二种选择:
public static class MissingExtensions
{
public static IEnumerable<int> FindMissing(this List<int> list)
{
// ...
}
}
这是您必须根据Bryan watts
答案编写的内容
public partial class Missing : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
// Your code
}
}
public static class MissingExtensions
{
public static IEnumerable<int> FindMissing(this List<int> list)
{
// ...
}
}