6 replies to this topic

[Jesper]

Hi
This is my first post so hope i'm doing it right .

My experiences with Netduino and C#, is only basic knowledge.

My problem is that i can't get my Method to compile with the Micro Framework,
the problem is that i can't use "this byte". Is there a workaround for this solution.

public static class Class1
    {
        public static bool GetBit(this byte b, int bitNumber)
        {
            return (b & (1 << bitNumber)) != 0;
        }
    }

I use the code like this

if (signExp.GetBit(7)) sign = 1;

[Stefan]

Hi Jesper and welcome to the forums! this byte, what are you trying to do? The keyword 'this' doesn't belong there. Doesn't it work without?

[Magpie]

Hi Jesper

Your code is trying to use what are called extension methods.

You can read about them here.
extension methods

you can probably just drop the 'this' and change your call.

[Geancarlo]

You can try this out http://mikedodaro.ne...icro-framework/

[CW2]

My problem is that i can't get my Method to compile with the Micro Framework,

If you compile your application for .NET Micro Framework version 4.1, you'd need to add ExtensionAttribute as suggested by Geancarlo, in .NET MF version 4.2 the attribute is already included in core libraries and no changes are necessary.

[Jesper]

Hi Jesper and welcome to the forums!

this byte, what are you trying to do? The keyword 'this' doesn't belong there. Doesn't it work without?

Thanks Stefan..

I'm trying to reuse some code i have written in a PC application, and now the its the Netduino's time to do job.

I won't to make my call like this

if (testData.GetBitV1(0)) Console.WriteLine("BitV1: 0 is true");

With one parameter and not tow.

But with the Netduino program it seams that i can't write my extension method like this. To get it working i need tow parameter the source and the input value.


Console application to test.

using System;
using Win32TestFunc.Win32TestFunc;

namespace Win32TestFunc
{
    class Program
    { 
        static void Main()
        {
            const byte testData = 1;

            if (testData.GetBitV1(0)) Console.WriteLine("BitV1: 0 is true");                      // This solution i "need" but dose not work in the Micro framework
            if (BitHelper.GetBitV2(testData, 0)) Console.WriteLine("BitV2: 0 is true");   // This solution is working in the Micro framework
            Console.ReadLine();
        }
    }
}

The class

namespace Win32TestFunc
{
    namespace Win32TestFunc
    {
        public static class BitHelper
        {
            public static bool GetBitV1(this byte b, int bitNumber)
            {
                return (b & (1 << bitNumber)) != 0;
            }

            public static bool GetBitV2(byte b, int bitNumber)
            {
                return (b & (1 << bitNumber)) != 0;
            }
        }

    }

}

[Jesper]

You can try this out http://mikedodaro.ne...icro-framework/

Thanks i will take a look )
Jesper