DllImport,如何检查DLL是否已加载？

using System.Diagnostics;
using System.Linq;

bool IsDllLoaded(string dllName)
{
    return Process.GetCurrentProcess()
                 .Modules
                 .Cast<ProcessModule>()
                 .Any(m => m.ModuleName.Equals(dllName, StringComparison.OrdinalIgnoreCase));
}

// 示例：检查"user32.dll"
bool isLoaded = IsDllLoaded("user32.dll");

using System;
using System.Runtime.InteropServices;

class DllChecker
{
    [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
    private static extern IntPtr GetModuleHandle(string lpModuleName);

    public static bool IsDllLoaded(string dllName)
    {
        return GetModuleHandle(dllName) != IntPtr.Zero;
    }
}

// 使用示例
bool isLoaded = DllChecker.IsDllLoaded("kernel32.dll");

[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
private static extern IntPtr LoadLibrary(string lpFileName);

// 强制加载示例
IntPtr handle = LoadLibrary("MyLib.dll");
if (handle == IntPtr.Zero)
{
    int errorCode = Marshal.GetLastWin32Error();
    Console.WriteLine($"加载失败，错误代码: {errorCode}");
}