非静态字段，方法或属性需要对象引用

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();
        }
    }
}

Answer 1

You need to change it to:

public static void LaunchMinecraft()

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

Answer 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();

Answer 3

     static void Main(string[] args)
            {
                Program pg = new Program();
                pg.LaunchMinecraft();

            }

Try this.

Answer 4

You are trying to call an instance method (ie. a method that needs a specific object to operate on) from a static method (a method that works without a specific object). Make the LaunchMinecraft method static as well.

Answer 5

我对C＃了解不多，但Main()方法是静态的，而LaunchMinecraft()则不是，这就是导致此错误的原因。