在 C# 中以编程方式设置 dllimport [英] Setting dllimport programmatically in C#

问题描述

我在我的解决方案中使用了 DllImport.
我的问题是我有同一个 DLL 的两个版本，一个是为 32 位构建的，另一个是为 64 位构建的.

I am using DllImport in my solution.
My problem is that I have two versions of the same DLL one built for 32 bit and another for 64 bit.

它们都公开具有相同名称和相同签名的相同函数.我的问题是我必须使用两种静态方法来公开这些方法，然后在运行时使用 IntPtr 大小来确定要调用的正确方法.

They both expose the same functions with identical names and identical signatures. My problem is that I have to use two static methods which expose these and then at run time use IntPtr size to determine the correct one to invoke.

private static class Ccf_32
{
    [DllImport(myDllName32)]
    public static extern int func1();
}

private static class Ccf_64
{
    [DllImport(myDllName64)]
    public static extern int func1();
}

我必须这样做，因为 myDllName32 和 myDllName64 必须是常量，而且我还没有找到在运行时设置它的方法.

I have to do this because myDllName32 and myDllName64 must be constant and I have not found a way to set it at run time.

有没有人有一个优雅的解决方案，这样我就可以摆脱代码重复和常量 IntPtr 大小检查.

Does anyone have an elegant solution for this so I could get rid of the code duplication and the constant IntPtr size checking.

如果我可以设置文件名，我只需要检查一次，我就可以摆脱大量重复的代码.

If I could set the file name, I would only have to check once and I could get rid of a ton of repeated code.

推荐答案

您或许可以使用 #if 关键字来实现这一点.如果你定义了一个名为 win32 的条件编译器符号，下面的代码将使用 win32 块，如果你删除它，它将使用另一个块:

You can probably achieve this with the #if keyword. If you define a conditional compiler symbol called win32, the following code will use the win32-block, if you remove it it will use the other block:

#if win32
    private static class ccf_32
    {
        [DllImport(myDllName32)]
        public static extern int func1();
    }
#else    
    private static class ccf_64
    {
        [DllImport(myDllName64)]
        public static extern int func1();
    }
#endif

这可能意味着您可以删除您现在拥有的类包装:

This probably means that you can remove the class wrapping that you have now:

    private static class ccf
    {
#if win32
        [DllImport(myDllName32)]
        public static extern int func1();
#else    
        [DllImport(myDllName64)]
        public static extern int func1();
#endif
    }

为了方便起见，我想您可以创建构建配置来控制编译符号.

For convenience, I guess you could create build configurations for controlling the compilation symbol.

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