Avoid unnessary PlatformNotSupportedException when call EnableFastpath on win7

[yyjdelete]

No description provided.

[yyjdelete]

Test failed

looks like another issue and not related to #41
net_core_tests_mac_1015> DotNetty.Handlers.Tests.TlsHandlerTest.TlsWrite(frameLengths: [14465, 9801, 16911, -1, 7057, ...], isClient: False, serverProtocol: Tls11, clientProtocol: Tls11)

System.AggregateException : One or more errors occurred. ( The WriteAsync method cannot be called when another write operation is pending.)
---- System.NotSupportedException :  The WriteAsync method cannot be called when another write operation is pending.


Stack trace
   at DotNetty.Transport.Channels.Embedded.EmbeddedChannel.CheckException(IPromise promise) in /Users/runner/work/1/s/src/DotNetty.Transport/Channels/Embedded/EmbeddedChannel.cs:line 631
   at DotNetty.Transport.Channels.Embedded.EmbeddedChannel.CheckException() in /Users/runner/work/1/s/src/DotNetty.Transport/Channels/Embedded/EmbeddedChannel.cs:line 638
   at DotNetty.Transport.Channels.Embedded.EmbeddedChannel.WriteOutbound(Object[] msgs) in /Users/runner/work/1/s/src/DotNetty.Transport/Channels/Embedded/EmbeddedChannel.cs:line 448
   at DotNetty.Handlers.Tests.TlsHandlerTest.TlsWrite(Int32[] frameLengths, Boolean isClient, SslProtocols serverProtocol, SslProtocols clientProtocol) in /Users/runner/work/1/s/test/DotNetty.Handlers.Tests/TlsHandlerTest.cs:line 203
   at DotNetty.Handlers.Tests.TlsHandlerTest.TlsWrite(Int32[] frameLengths, Boolean isClient, SslProtocols serverProtocol, SslProtocols clientProtocol) in /Users/runner/work/1/s/test/DotNetty.Handlers.Tests/TlsHandlerTest.cs:line 232
--- End of stack trace from previous location ---
----- Inner Stack Trace -----
   at System.Net.Security.SslStream.WriteAsyncInternal[TIOAdapter](TIOAdapter writeAdapter, ReadOnlyMemory`1 buffer)
   at System.Net.Security.SslStream.Write(Byte[] buffer, Int32 offset, Int32 count)
   at System.IO.Stream.Write(ReadOnlySpan`1 buffer)
   at DotNetty.Buffers.UnpooledHeapByteBuffer.GetBytes(Int32 index, Stream destination, Int32 length) in /Users/runner/work/1/s/src/DotNetty.Buffers/UnpooledHeapByteBuffer.cs:line 173
   at DotNetty.Buffers.AbstractByteBuffer.ReadBytes(Stream destination, Int32 length) in /Users/runner/work/1/s/src/DotNetty.Buffers/AbstractByteBuffer.cs:line 940
   at DotNetty.Handlers.Tls.TlsHandler.Wrap(IChannelHandlerContext context) in /Users/runner/work/1/s/src/DotNetty.Handlers/Tls/TlsHandler.Writer.cs:line 148
   at DotNetty.Handlers.Tls.TlsHandler.WrapAndFlush(IChannelHandlerContext context) in /Users/runner/work/1/s/src/DotNetty.Handlers/Tls/TlsHandler.Writer.cs:line 108
   at DotNetty.Handlers.Tls.TlsHandler.Flush(IChannelHandlerContext context) in /Users/runner/work/1/s/src/DotNetty.Handlers/Tls/TlsHandler.Writer.cs:line 66
--- End of stack trace from previous location ---
   at DotNetty.Handlers.Tls.TlsHandler.Flush(IChannelHandlerContext context) in /Users/runner/work/1/s/src/DotNetty.Handlers/Tls/TlsHandler.Writer.cs:line 72
   at DotNetty.Transport.Channels.AbstractChannelHandlerContext.InvokeFlush0() in /Users/runner/work/1/s/src/DotNetty.Transport/Channels/AbstractChannelHandlerContext.cs:line 871

[cuteant]

我还真就一直没在win7上做过本地测试:smile:，Try catch都不起作用吗:smiley:

[yyjdelete]

try-catch有效, 只是一直抛异常影响调试和部分用FirstChanceException做日志的人