C# Error CS0525 – Interfaces cannot contain fields

C# Compiler Error

CS0525 – Interfaces cannot contain fields

Reason for the Error

You’ll get this error in your C# code when you try to define a field inside interface.

For example, let’s try to compile the below C# code snippet.

using System;
namespace DeveloperPublishNamespace
{
    public interface IDeveloperPublish
    {
        public int field1; 
    }

    class Program
    {
      
        static void Main(string[] args)
        {
            Console.WriteLine("No Error");
        }
    }
}

You’ll receive the error code CS0525 you have defined the field field1 in the interface IDeveloperPublish which is currently not supported in C#.

Error CS0525 Interfaces cannot contain instance fields DeveloperPublish C:\Users\SenthilBalu\source\repos\ConsoleApp4\ConsoleApp4\Program.cs 6 Active

Solution

In C#, the interface cannot contain fields. It can contain only methods and properties.

To fix this error in your C# code, you will need to remove the field definition inside interface.