如何从托管DLL获取可执行文件路径

using System.Runtime.InteropServices;

// 导入C++ DLL库
[DllImport("mydll.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Auto, SetLastError = true)]
public static extern IntPtr GetExecutablePath(bool mustExist, out StringBuilder sb);

// 可选参数，如果不需要绝对路径，可以设置为false
public static bool MustExist { get { return true; } }

public static string GetExecptionFilePath()
{
    // 创建StringBuilder对象，并设置大小
    StringBuilder sb = new StringBuilder(260);

    // 调用函数，返回指向C++中可执行文件指针的句柄
    IntPtr pointer = GetExecutablePath(MustExist, out sb);

    // 确保句柄有效，避免潜在的错误
    if (IntPtr.Zero == pointer)
    {
        var errorInfo = Marshal.GetLastWin32Error();
        throw new Exception($"获取可执行文件路径时出错: {errorInfo}");
    }

    // 取回指针指向的缓冲区内容
    return sb.ToString();
}