静态/通用/非通用定义错误

Question

Techies-- I think I'm defining this static extension correctly for Split, I obviously am not because the message: Extension method must be defined in a non-generic static class.

This is a simple c# console program to test something. Here's what I have:

class Program
{ 
  static int Main(string[] args)
  {
    int[] numbers = new int[10000]; 
           for (int i = 0; i < numbers.Length; ++i) 
               numbers[i] = i; 

  int[][] sectionedNumbers = numbers.Split(1000); 
   .
   . //blah blah blah .. rest of code

 return 0;
 }

 public static T[][] Split<T>(this T[] arrayIn, int length)
 {
  bool even = arrayIn.Length % length == 0;
    .
    .
    . // blah blah .. more code

   return newArray;
   }

What is it that I'm doing incorrectly?

Answer 1

Your class Program is not static as requested by the error message.

• Add the static directive to the class declaration:

    static class Program { // ... 

• or move Split into another static class altogether.

Then your code should compile again.

Answer 2

Hello your container class must be static

Set you method in static class

public static class Extension
{
 public static T[][] Split<T>(this T[] arrayIn, int length)
 {
  bool even = arrayIn.Length % length == 0;
    .
    .
    . // blah blah .. more code

   return newArray;
   }

}

Answer 3

You need to define your extension method in a class, like this:

public static class ArrayExtensions
{
 public static T[][] Split<T>(this T[] arrayIn, int length) 
 { 
  bool even = arrayIn.Length % length == 0; 
    . 
    . 
    . // blah blah .. more code 

   return newArray; 
   } 
}