An object reference is required for the non-static field, method, or property

Question

I wrote a very small function to start a Java application in C# NET, but I am getting the error "An object reference is required for the non-static field, method, or property 'MinecraftDaemon.Program.LaunchMinecraft()' C:\Users\Mike\Desktop\Minecraft\MinecraftDaemon\Program.cs". I have searched other threads that suffer from the same issue but I don't understand what it means or why I am getting it.

namespace MinecraftDaemon
{
    class Program
    {
        public void LaunchMinecraft()
        {
            ProcessStartInfo processInfo = new ProcessStartInfo("java.exe", "-Xmx1024M -Xms1024M -jar minecraft_server.jar nogui");
            processInfo.CreateNoWindow = true;
            processInfo.UseShellExecute = false;

            try
            {
                using (Process minecraftProcess = Process.Start(processInfo))
                {
                    minecraftProcess.WaitForExit();
                }
            }
            catch
            {
                // Log Error
            }
        }

        static void Main(string[] args)
        {
            LaunchMinecraft();
        }
    }
}

Solution 1

You need to change it to:

public static void LaunchMinecraft()

That way, the static Main method can access the static LaunchMinecraft method.

Solution 2

LaunchMinecraft is not a static method so you cannot access it in the static method Main without calling it from the Program object.

Two options
1. Make LaunchMinecraft static

public void LaunchMinecraft() 
{ ... }  

2. Create a new Program object in Main and call it that way.

var program = new Program();
program.LaunchMinecraft();

Comments

[VoodooChild]

I think it is because LaunchMineCraft method needs an instance. Or that method should be Static.

[VoodooChild]

I wonder if a Compiler warning is given for this case? anyone?

[Edi]

Another option, of course, is to change Main() to new Program().LaunchMinecraft();