How to resolve fieldinfo error if condition?

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Hello,

I have write this code but its getting error:-

acceptedCommandsFieldInfo is a field but is used like a type

Pleas help me how to resolve this error.

Thanks in Advance.

Ankit Agarwal
Software Engineer

What I have tried:

class MyService
    {
        const int SERVICE_ACCEPT_PRESHUTDOWN = 0x100;
        const int SERVICE_CONTROL_PRESHUTDOWN = 0xf;
        FieldInfo acceptedCommandsFieldInfo =
        typeof(ServiceBase).GetField("acceptedCommands", BindingFlags.Instance | BindingFlags.NonPublic);
        if (acceptedCommandsFieldInfo == null)// Error in this line
            throw ApplicationException("acceptedCommands field not found");// Error in this line
    
            int value = (int)acceptedCommandsFieldInfo.GetValue(this);// Error in this line
            acceptedCommandsFieldInfo.SetValue(this, value SERVICE_ACCEPT_PRESHUTDOWN);// Error in this line
    }

Posted 1-Jan-17 20:32pm

Agarwal1984

Updated 1-Jan-17 20:41pm

v2

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Thomas Daniels · Answer 1 · 2017-01-01T20:41:00

The problem is that you are running this code right in the class. You cannot do this, you have to run the code in a method in your class.

It looks like you want to create a service? Then put it in an OnStart function (but then your class has to derive from ServiceBase, too). Also in your last line, you pass "value SERVICE_ACCEPT_PRESHUTDOWN" which look like two variables. You can only pass one. I don't know exactly what you try to do, so you have to know yourself which one to pass there (but I guess it will be SERVICE_ACCEPT_PRESHUTDOWN). Also, you have to use throw new ApplicationException instead of throw ApplicationException.

C#

class MyService : ServiceBase
{
    protected override void OnStart(string[] args)
    {
            FieldInfo acceptedCommandsFieldInfo = typeof(ServiceBase).GetField("acceptedCommands", BindingFlags.Instance | BindingFlags.NonPublic);
            if (acceptedCommandsFieldInfo == null)
                throw new ApplicationException("acceptedCommands field not found");
    
            int value = (int)acceptedCommandsFieldInfo.GetValue(this);
            acceptedCommandsFieldInfo.SetValue(this, SERVICE_ACCEPT_PRESHUTDOWN);
    }
}