From 4cc4837fbe2e557747da6e6f2d2a4a8b90e99c6e Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Tue, 22 Nov 2016 17:04:22 +0900
Subject: [PATCH] [Modify] Throw exceptions

---
 websocket-sharp/WebSocket.cs | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/websocket-sharp/WebSocket.cs b/websocket-sharp/WebSocket.cs
index fbb4cec6..defdb859 100644
--- a/websocket-sharp/WebSocket.cs
+++ b/websocket-sharp/WebSocket.cs
@@ -2848,17 +2848,19 @@ namespace WebSocketSharp
     /// </param>
     public void SendAsync (string data, Action<bool> completed)
     {
-      var msg = _readyState.CheckIfAvailable (false, true, false, false) ??
-                CheckSendParameter (data);
+      if (_readyState != WebSocketState.Open) {
+        var msg = "The current state of the connection is not Open.";
+        throw new InvalidOperationException (msg);
+      }
 
-      if (msg != null) {
-        _logger.Error (msg);
-        error ("An error has occurred in sending data.", null);
+      if (data == null)
+        throw new ArgumentNullException ("data");
 
-        return;
-      }
+      byte[] bytes;
+      if (!data.TryGetUTF8EncodedBytes (out bytes))
+        throw new ArgumentException ("Cannot be UTF8 encoded.", "data");
 
-      sendAsync (Opcode.Text, new MemoryStream (data.UTF8Encode ()), completed);
+      sendAsync (Opcode.Text, new MemoryStream (bytes), completed);
     }
 
     /// <summary>