无法访问静态 Class 函数？

Question

这是我的代码

static class NativeMethods
{

    [DllImport("kernel32.dll")]
    public static extern IntPtr LoadLibrary(string dllToLoad);    
    [DllImport("kernel32.dll")]
    public static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);
    [DllImport("kernel32.dll")]
    public static extern bool FreeLibrary(IntPtr hModule);
}
class manageCAN
{
    // Getting the String for .dll Address
    string dllfile = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location) + @"\VTC1010_CAN_Bus.dll";
    // Loading dll using Native Methods
    IntPtr pDll = NativeMethods.LoadLibrary(dllfile);
}

我收到一个错误：错误 1 字段初始值设定项无法引用非静态字段、方法或属性 'manageDLL.manageCAN.dllfile'

请提出解决方案。为什么我不能初始化我的变量 "pDll"？

Answer 1

Why can't I initialize my variable "pDll"?

编译器会告诉您确切原因 - 您无法访问实例字段初始值设定项中的实例字段。看起来这些应该是静态的：

static readonly string dllfile = ...;
static readonly IntPtr pDll = NativeMethods.LoadLibrary(dllfile);

但是如果你真的希望它们成为实例字段，你需要在构造函数中初始化pDll：

class manageCAN
{
    // Getting the String for .dll Address
    string dllfile = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location) + @"\VTC1010_CAN_Bus.dll";
    // Loading dll using Native Methods
    IntPtr pDll;

    public manageCAN()
    {
        pDll = NativeMethods.LoadLibrary(dllfile);
    }
}

无法访问静态 Class 函数？

Can Not Access Static Class Function?

c#

dll

unmanaged