要获取C#中的显卡信息，你可以使用管理对象提供的WMI（Windows Management Instrumentation）类。

下面是实现代码示例:

using System.Management;

public static void GetGraphicsCardInformation()
{
    ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_VideoController");
    foreach (ManagementObject obj in searcher.Get())
    {
        Console.WriteLine("Name  -  " + obj["Name"].ToString());
        Console.WriteLine("Adapter Compatibility  -  " + obj["AdapterCompatibility"].ToString());
        Console.WriteLine("Adapter RAM  -  " + obj["AdapterRAM"].ToString());
        Console.WriteLine("Driver Version  -  " + obj["DriverVersion"].ToString());
        Console.WriteLine("Video Processor  -  " + obj["VideoProcessor"].ToString());
    }
}

此代码使用WMI查询了所有Win32_VideoController对象，通过迭代遍历每个对象并打印显卡的名称，适配器兼容性，适配器RAM，驱动程序版本和视频处理器信息。