运行效果

Win10风格
XP风格

输入用户名和密码点击确定后获取到的信息：
打印信息

用到的运行库

NuGet搜索安装即可

Kang.ExtendMethod
Kang.ExtendMethod.Log

https://gitee.com/haozekang/kang

Vanara.PInvoke

https://github.com/dahall/Vanara/

代码实现

使用日志

readonly Logger logger = LogManager.GetCurrentClassLogger();

Win10 Flat风格

CredUI.CREDUI_INFO info = new CredUI.CREDUI_INFO();
info.pszCaptionText = "登录大伽";
info.pszMessageText = "欢迎使用大伽智能病理系统";
info.cbSize = Marshal.SizeOf(info);
uint pulAuthPackage = 0, ulInAuthBufferSize = 0, pulOutAuthBufferSize;
IntPtr pvInAuthBuffer = IntPtr.Zero, ppvOutAuthBuffer = IntPtr.Zero, pAuthBuffer = IntPtr.Zero;
bool isSave = false;
int maxUnSize = 50, maxPwSize = 50, maxDomSize = 50;
StringBuilder un = new StringBuilder(maxUnSize), pw = new StringBuilder(maxPwSize), dom = new StringBuilder(maxDomSize);

var error = CredUI.CredUIPromptForWindowsCredentials(info, Win32Error.NO_ERROR, ref pulAuthPackage, pvInAuthBuffer, ulInAuthBufferSize, out ppvOutAuthBuffer, out pulOutAuthBufferSize, ref isSave, CredUI.WindowsCredentialsDialogOptions.CREDUIWIN_GENERIC);
if (error == Win32Error.ERROR_CANCELLED)
{
    logger.Debug($"{error}");
    return;
}
if (error != Win32Error.ERROR_SUCCESS)
{
    logger.Debug($"{error}");
    return;
}
var flag = CredUI.CredUnPackAuthenticationBuffer(CredUI.CredPackFlags.CRED_PACK_GENERIC_CREDENTIALS, ppvOutAuthBuffer, (int)pulOutAuthBufferSize, un, ref maxUnSize, dom, ref maxDomSize, pw, ref maxPwSize);
if (un.ToString().IsBlank())
{
    logger.Debug($"用户名不能为空！");
    return;
}
if (pw.ToString().IsBlank())
{
    logger.Debug($"密码不能为空！");
    return;
}
if (!flag)
{
    logger.Debug($"获取用户名及密码信息失败！");
    return;
}
logger.Debug($"用户名：{un}    密码：{pw}");

XP风格

CredUI.CREDUI_INFO info = new CredUI.CREDUI_INFO();
info.pszCaptionText = "登录大伽";
info.pszMessageText = "欢迎使用大伽智能病理系统";
info.cbSize = Marshal.SizeOf(info);
IntPtr Reserved = IntPtr.Zero;
bool isSave = false;
int maxUnSize = 50, maxPwSize = 50;
StringBuilder un = new StringBuilder(maxUnSize), pw = new StringBuilder(maxPwSize);

var error = CredUI.CredUIPromptForCredentials(info, "www.dakapath.com/dakapath", Reserved, Win32Error.NO_ERROR, un, 10, pw, 10, ref isSave, CredUI.CredentialsDialogOptions.CREDUI_FLAGS_DEFAULT);