尝试使用 C# 中的新 IFileDialog 和 IFileOpenDialog 接口以最少的代码打开文件对话框

using System;
using System.Runtime.InteropServices;

class Program
{
    [DllImport("Comdlg32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    private static extern int CoCreateInstance(
        [MarshalAs(UnmanagedType.LPStruct)] Guid rclsid,
        IntPtr pUnkOuter,
        uint dwClsContext,
        [MarshalAs(UnmanagedType.LPStruct)] Guid riid,
        out IntPtr ppv);

    static void Main(string[] args)
    {
        // 创建IFileOpenDialog接口实例
        Guid clsid = new Guid("DC1C5A9C-E88A-4dde-A5A1-60F82A20AEF7");
        Guid riid = new Guid("42F85136-DB7E-439C-85F1-E4075D135FC8");
        IntPtr pFileOpenDialog;
        int hr = CoCreateInstance(clsid, IntPtr.Zero, 1, riid, out pFileOpenDialog);
        if (hr != 0)
        {
            Console.WriteLine("无法创建IFileOpenDialog实例");
            return;
        }

        // 显示文件对话框
        hr = pFileOpenDialog.GetType().InvokeMember("Show", System.Reflection.BindingFlags.InvokeMethod, null, pFileOpenDialog, null);
        if (hr != 0)
        {
            Console.WriteLine("无法显示文件对话框");
            return;
        }

        // 获取选择的文件路径
        Guid shellItemGuid = new Guid("43826D1E-E718-42EE-BC55-A1E261C37BFE");
        IntPtr pItem;
        hr = pFileOpenDialog.GetType().InvokeMember("GetResult", System.Reflection.BindingFlags.InvokeMethod, null, pFileOpenDialog, new object[] { pItem });
        if (hr != 0)
        {
            Console.WriteLine("无法获取选择的文件路径");
            return;
        }

        // 获取文件路径
        string filePath = GetFilePathFromShellItem(pItem);
        Console.WriteLine("选择的文件路径：" + filePath);

        // 释放资源
        Marshal.Release(pItem);
        Marshal.Release(pFileOpenDialog);
    }

    private static string GetFilePathFromShellItem(IntPtr pItem)
    {
        Guid shellItemGuid = new Guid("43826D1E-E718-42EE-BC55-A1E261C37BFE");
        IntPtr pFilePath;
        int hr = pItem.GetType().InvokeMember("GetDisplayName", System.Reflection.BindingFlags.InvokeMethod, null, pItem, new object[] { shellItemGuid, pFilePath });
        if (hr != 0)
        {
            Console.WriteLine("无法获取文件路径");
            return null;
        }

        string filePath = Marshal.PtrToStringAuto(pFilePath);
        Marshal.FreeCoTaskMem(pFilePath);
        return filePath;
    }
}