我正在尝试使用以下代码检查与本地TCP服务器（activeMQ代理）的TCP连接：
SELECT
p.id,p.post_title,p.post_content,p.post_excerpt,t.name AS product_category,t.term_id AS product_id,tt.term_taxonomy_id AS tt_term_taxonomia,tr.term_taxonomy_id AS tr_term_taxonomia,pm1.meta_value AS price
FROM wp_posts p
LEFT JOIN wp_postmeta pm1 ON pm1.post_id = p.ID AND pm1.meta_key = '_price'
JOIN wp_term_relationships AS tr ON tr.object_id = p.ID
JOIN wp_term_taxonomy AS tt ON tt.taxonomy = 'product_cat'
AND tt.term_taxonomy_id = tr.term_taxonomy_id
JOIN wp_terms AS t ON t.term_id = tt.term_id
WHERE p.post_type in('product','product_variation') AND p.post_status = 'publish'
ORDER BY
CASE WHEN p.post_parent = 0 THEN id else post_parent END,CASE WHEN p.post_parent = 0 THEN 1 else 2 END;
我停止了本地主机服务器（activeMQ代理），并尝试运行上述代码。它抛出了string host = "localhost";
int port = 61616;
using (TcpClient tcpClient = new TcpClient())
{
try
{
Task t = Task.Run(() => {
tcpClient.Connect(host,port);
});
Console.WriteLine("Connected.");
TimeSpan ts = TimeSpan.FromMilliseconds(150);
if (!t.Wait(ts))
{
Console.WriteLine("The timeout interval elapsed.");
Console.WriteLine("Could not connect to: {0}",port);// ((IPEndPoint)tcpClient.Client.RemoteEndPoint).Port.ToString());
}
else
{
Console.WriteLine("Port {0} open.",port);
}
}
catch (UnauthorizedaccessException )
{
Console.WriteLine("Caught unauthorized access exception-await behavior");
}
catch (aggregateexception )
{
Console.WriteLine("Caught aggregate exception-Task.Wait behavior");
}
。当我启动服务器并运行代码时；它连接到服务器。
根据documentation of TcpClient.Connect，它表示将抛出以下其中一项：
-
System.aggregateexception -
ArgumentNullException -
ArgumentOutOfRangeException -
SocketException -
ObjectDisposedException -
SecurityException
为什么会抛出NotSupportedException？