.NET 7.0(C#)获取Windows域用户姓名遇异常求替代方案

方法1：调用Windows原生API（最稳定） #

直接通过P/Invoke调用系统API，无需额外NuGet包，兼容性拉满：

using System;
using System.Runtime.InteropServices;
using System.Text;

public static class UserDisplayNameHelper
{
    private enum ExtendedNameFormat
    {
        NameDisplay = 3
    }

    [DllImport("secur32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
    private static extern bool GetUserNameEx(ExtendedNameFormat format, StringBuilder buffer, ref uint bufferSize);

    public static string GetCurrentUserDisplayName()
    {
        uint bufferSize = 0;
        // 先获取所需缓冲区大小
        GetUserNameEx(ExtendedNameFormat.NameDisplay, null, ref bufferSize);
        if (bufferSize == 0)
            throw new System.ComponentModel.Win32Exception();

        var nameBuffer = new StringBuilder((int)bufferSize);
        if (!GetUserNameEx(ExtendedNameFormat.NameDisplay, nameBuffer, ref bufferSize))
            throw new System.ComponentModel.Win32Exception();

        return nameBuffer.ToString();
    }
}

调用方式：var displayName = UserDisplayNameHelper.GetCurrentUserDisplayName();

方法2：直接查询Active Directory #

如果需要查询特定用户（而非当前登录用户），先安装NuGet包System.DirectoryServices，再用以下代码：

using System.DirectoryServices;

public static string GetUserDisplayNameFromAD(string domainUser)
{
    var domainAndUser = domainUser.Split('\\');
    var domain = domainAndUser[0];
    var userName = domainAndUser[1];

    using var adEntry = new DirectoryEntry($"LDAP://{domain}");
    using var searcher = new DirectorySearcher(adEntry)
    {
        Filter = $"(&(objectClass=user)(sAMAccountName={userName}))",
        PropertiesToLoad = { "displayName" }
    };

    var result = searcher.FindOne();
    return result?.Properties["displayName"]?[0]?.ToString();
}

调用示例：var displayName = GetUserDisplayNameFromAD("DomainXX\\U12312");

方法3：兼容AccountManagement的 fallback方案 #

如果想保留原思路，可加异常捕获，失败时自动切换到原生API：

using System.DirectoryServices.AccountManagement;

public static string GetUserDisplayName()
{
    try
    {
        using var context = new PrincipalContext(ContextType.Domain);
        using var user = UserPrincipal.Current;
        return user.DisplayName;
    }
    catch (PlatformNotSupportedException)
    {
        // 失败时切换到原生API
        return UserDisplayNameHelper.GetCurrentUserDisplayName();
    }
}

内容的提问来源于stack exchange，提问作者Sonderwoods