C# Compiler Error
CS0202 – foreach requires that the return type ‘type’ of ‘type.GetEnumerator()’ must have a suitable public MoveNext method and public Current property
Reason for the Error
You will receive this error when you return either a pointer or an array from a GetEnumerator function in your C# code.
For example, try to compile the below code snippet.
using System;
using System.Collections;
namespace DeveloperPubNamespace
{
public class Days
{
string[] tage = { "mon", "tue", "wed", "thu", "fri" };
public IEnumerator[] GetEnumerator()
{
for (int i = 0; i < tage.Length; i++)
yield return tage[i];
}
}
class Program
{
static void Main(string[] args)
{
Days daylist = new Days();
foreach (string s in daylist)
{
Console.WriteLine(s);
}
}
}
}This program will result with the error code CS0202 because the GetEnumerator returns IEnumerator[] which is an array.
Error CS0202 foreach requires that the return type ‘IEnumerator[]’ of ‘Days.GetEnumerator()’ must have a suitable public ‘MoveNext’ method and public ‘Current’ property ConsoleApp3 C:\Users\SenthilBalu\source\repos\ConsoleApp3\ConsoleApp3\Program.cs 20 Active
Solution
To fix the error code CS0202, you will need to ensure that the function GetEnumerator always returns an instanxe of a class of type Enumerator. The above code can fixed by renaming the return type to IEnumerator from IEnumerator[].
using System;
using System.Collections;
namespace DeveloperPubNamespace
{
public class Days
{
string[] tage = { "mon", "tue", "wed", "thu", "fri" };
public IEnumerator GetEnumerator()
{
for (int i = 0; i < tage.Length; i++)
yield return tage[i];
}
}
class Program
{
static void Main(string[] args)
{
Days daylist = new Days();
foreach (string s in daylist)
{
Console.WriteLine(s);
}
}
}
}
