在C#中，要管理RSTP（Rapid Spanning Tree Protocol）的MAC地址表，你需要使用一個數據結構來存儲和操作這些信息。以下是一個簡單的示例，展示了如何使用C#創建一個RSTP的MAC地址表并進行基本操作：

1. 首先，創建一個表示MAC地址的類：

public class MacAddress
{
    public string Address { get; set; }
}

2. 然后，創建一個表示RSTP的MAC地址表的類：

using System.Collections.Generic;

public class RstpMacAddressTable
{
    private Dictionary<string, MacAddress> _macAddresses;

    public RstpMacAddressTable()
    {
        _macAddresses = new Dictionary<string, MacAddress>();
    }

    public void AddMacAddress(string port, MacAddress macAddress)
    {
        if (!_macAddresses.ContainsKey(port))
        {
            _macAddresses.Add(port, macAddress);
        }
    }

    public void RemoveMacAddress(string port)
    {
        if (_macAddresses.ContainsKey(port))
        {
            _macAddresses.Remove(port);
        }
    }

    public MacAddress GetMacAddress(string port)
    {
        if (_macAddresses.ContainsKey(port))
        {
            return _macAddresses[port];
        }
        return null;
    }

    public ICollection<MacAddress> GetAllMacAddresses()
    {
        return _macAddresses.Values;
    }
}

3. 最后，你可以在你的應用程序中使用這個RSTP的MAC地址表：

public class Program
{
    public static void Main(string[] args)
    {
        var rstpMacAddressTable = new RstpMacAddressTable();

        // 添加MAC地址
        rstpMacAddressTable.AddMacAddress("Port1", new MacAddress { Address = "00:01:02:03:04:05" });
        rstpMacAddressTable.AddMacAddress("Port2", new MacAddress { Address = "00:01:02:03:04:06" });

        // 獲取MAC地址
        var macAddress = rstpMacAddressTable.GetMacAddress("Port1");
        Console.WriteLine($"MAC address for Port1: {macAddress.Address}");

        // 刪除MAC地址
        rstpMacAddressTable.RemoveMacAddress("Port1");

        // 獲取所有MAC地址
        var allMacAddresses = rstpMacAddressTable.GetAllMacAddresses();
        foreach (var address in allMacAddresses)
        {
            Console.WriteLine($"MAC address: {address.Address}");
        }
    }
}

這個示例展示了如何創建一個簡單的RSTP的MAC地址表，以及如何添加、刪除和查詢MAC地址。你可以根據你的需求對這個示例進行擴展和修改。