C# 使用 ClientWebSocket 实现 WebSocket 客户端
C# Net Core 使用 ClientWebSocket 实现 WebSocket 客户端
Net Core 使用 ClientWebSocket 实现 WebSocket 客户端
我们模仿HTML5的实现方式来重写一个C#类
https://www.runoob.com/html/html5-websocket.html
WebSocket 属性
HTML5 | 描述 | NET Core | 描述 |
readyState | 只读属性 readyState 表示连接状态,可以是以下值: 0 - 表示连接尚未建立。 1 - 表示连接已建立,可以进行通信。 2 - 表示连接正在进行关闭。 3 - 表示连接已经关闭或者连接不能打开。 |
State | WebSocket状态(点击看官方文档) |
bufferedAmount | 只读属性 bufferedAmount 已被 send() 放入正在队列中等待传输,但是还没有发出的 UTF-8 文本字节数。 | ------ | 无此属性 |
WebSocket 事件
HTML5 | 描述 | NET Core | 描述 |
onopen | 连接建立时触发 | OnOpen | 连接建立时触发 |
onmessage | 客户端接收服务端数据时触发 | OnMessage | 客户端接收服务端数据时触发(暂时只支持文本消息) |
onerror | 通信发生错误时触发 | OnError | 通信发生错误时触发 (如果处理消息中有错误事件没有处理,这里也会抛出并断开链接) |
onclose | 连接关闭时触发 | OnClose | 连接关闭时触发 |
WebSocket 方法
HTML5 | 描述 | NET Core | 描述 |
send() | 使用连接发送数据 | bool Send(string mess) bool Send(byte[] bytes) |
使用连接发送文本消息 返回:是否尝试了发送 |
close() | 关闭连接 | void Close() void Close(WebSocketCloseStatus closeStatus, string statusDescription) |
关闭连接(关闭原因为用户手动关闭) 关闭连接(自定义关闭原因) |
代码如下:
创建文件WSocketClientHelp.cs:
复制如下代码进去
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using
System;
using
System.Collections.Generic;
using
System.Linq;
using
System.Net.WebSockets;
using
System.Text;
using
System.Threading;
using
System.Threading.Tasks;
namespace
YingCaiEdu.Common.HttpHelp
{
public
class
WSocketClientHelp
{
ClientWebSocket ws =
null
;
Uri uri =
null
;
bool
isUserClose =
false
;
//是否最后由用户手动关闭
/// <summary>
/// WebSocket状态
/// </summary>
public
WebSocketState? State {
get
=> ws?.State; }
/// <summary>
/// 包含一个数据的事件
/// </summary>
public
delegate
void
MessageEventHandler(
object
sender,
string
data);
public
delegate
void
ErrorEventHandler(
object
sender, Exception ex);
/// <summary>
/// 连接建立时触发
/// </summary>
public
event
EventHandler OnOpen;
/// <summary>
/// 客户端接收服务端数据时触发
/// </summary>
public
event
MessageEventHandler OnMessage;
/// <summary>
/// 通信发生错误时触发
/// </summary>
public
event
ErrorEventHandler OnError;
/// <summary>
/// 连接关闭时触发
/// </summary>
public
event
EventHandler OnClose;
public
WSocketClientHelp(
string
wsUrl)
{
uri =
new
Uri(wsUrl);
ws =
new
ClientWebSocket();
}
/// <summary>
/// 打开链接
/// </summary>
public
void
Open()
{
Task.Run(async () =>
{
if
(ws.State == WebSocketState.Connecting || ws.State == WebSocketState.Open)
return
;
string
netErr =
string
.Empty;
try
{
//初始化链接
isUserClose =
false
;
ws =
new
ClientWebSocket();
await ws.ConnectAsync(uri, CancellationToken.None);
if
(OnOpen !=
null
)
OnOpen(ws,
new
EventArgs());
Send(
"放映"
);
//全部消息容器
List<
byte
> bs =
new
List<
byte
>();
//缓冲区
var
buffer =
new
byte
[1024 * 4];
//监听Socket信息
WebSocketReceiveResult result = await ws.ReceiveAsync(
new
ArraySegment<
byte
>(buffer), CancellationToken.None);
//是否关闭
while
(!result.CloseStatus.HasValue)
{
//文本消息
if
(result.MessageType == WebSocketMessageType.Text)
{
bs.AddRange(buffer.Take(result.Count));
//消息是否已接收完全
if
(result.EndOfMessage)
{
//发送过来的消息
string
userMsg = Encoding.UTF8.GetString(bs.ToArray(), 0, bs.Count);
if
(OnMessage !=
null
)
OnMessage(ws, userMsg);
//清空消息容器
bs =
new
List<
byte
>();
}
}
//继续监听Socket信息
result = await ws.ReceiveAsync(
new
ArraySegment<
byte
>(buffer), CancellationToken.None);
}
////关闭WebSocket(服务端发起)
//await ws.CloseAsync(result.CloseStatus.Value, result.CloseStatusDescription, CancellationToken.None);
}
catch
(Exception ex)
{
netErr =
" .Net发生错误"
+ ex.Message;
if
(OnError !=
null
)
OnError(ws, ex);
//if (ws != null && ws.State == WebSocketState.Open)
// //关闭WebSocket(客户端发起)
// await ws.CloseAsync(WebSocketCloseStatus.Empty, ex.Message, CancellationToken.None);
}
finally
{
if
(!isUserClose)
Close(ws.CloseStatus.Value, ws.CloseStatusDescription + netErr);
}
});
}
/// <summary>
/// 使用连接发送文本消息
/// </summary>
/// <param name="ws"></param>
/// <param name="mess"></param>
/// <returns>是否尝试了发送</returns>
public
bool
Send(
string
mess)
{
if
(ws.State != WebSocketState.Open)
return
false
;
Task.Run(async () =>
{
var
replyMess = Encoding.UTF8.GetBytes(mess);
//发送消息
await ws.SendAsync(
new
ArraySegment<
byte
>(replyMess), WebSocketMessageType.Text,
true
, CancellationToken.None);
});
return
true
;
}
/// <summary>
/// 使用连接发送字节消息
/// </summary>
/// <param name="ws"></param>
/// <param name="mess"></param>
/// <returns>是否尝试了发送</returns>
public
bool
Send(
byte
[] bytes)
{
if
(ws.State != WebSocketState.Open)
return
false
;
Task.Run(async () =>
{
//发送消息
await ws.SendAsync(
new
ArraySegment<
byte
>(bytes), WebSocketMessageType.Binary,
true
, CancellationToken.None);
});
return
true
;
}
/// <summary>
/// 关闭连接
/// </summary>
public
void
Close()
{
isUserClose =
true
;
Close(WebSocketCloseStatus.NormalClosure,
"用户手动关闭"
);
}
public
void
Close(WebSocketCloseStatus closeStatus,
string
statusDescription)
{
Task.Run(async () =>
{
try
{
//关闭WebSocket(客户端发起)
await ws.CloseAsync(closeStatus, statusDescription, CancellationToken.None);
}
catch
(Exception ex)
{
}
ws.Abort();
ws.Dispose();
if
(OnClose !=
null
)
OnClose(ws,
new
EventArgs());
});
}
}
}
|
使用方法:
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using
System;
using
System.Collections.Generic;
using
System.Linq;
using
System.Net.WebSockets;
using
System.Text;
using
System.Threading;
using
System.Threading.Tasks;
using
YingCaiEdu.Common.HttpHelp;
namespace
YingCaiEdu.PPT.VstoPpt
{
public
class
PptSocket
{
private
static
PptSocket _this;
public
static
PptSocket This
{
get
{
if
(_this ==
null
)
{
_this =
new
PptSocket();
}
return
_this;
}
}
public
WSocketClientHelp wSocketClient =
new
WSocketClientHelp(
"wss://baidu.com?user=ppt"
);
public
void
Go()
{
wSocketClient.OnOpen -= WSocketClient_OnOpen;
wSocketClient.OnMessage -= WSocketClient_OnMessage;
wSocketClient.OnClose -= WSocketClient_OnClose;
wSocketClient.OnError -= WSocketClient_OnError;
wSocketClient.OnOpen += WSocketClient_OnOpen;
wSocketClient.OnMessage += WSocketClient_OnMessage;
wSocketClient.OnClose += WSocketClient_OnClose;
wSocketClient.OnError += WSocketClient_OnError;
wSocketClient.Open();
}
private
void
WSocketClient_OnError(
object
sender, Exception ex)
{
}
private
void
WSocketClient_OnClose(
object
sender, EventArgs e)
{
}
private
void
WSocketClient_OnMessage(
object
sender,
string
data)
{
//处理的消息错误将会忽略
try
{
if
(data.Contains(
"放映"
))
{
PptVstoApp.GetPptApp.SlideShowFromCurrent();
}
}
catch
(Exception ex)
{
}
}
private
void
WSocketClient_OnOpen(
object
sender, EventArgs e)
{
}
}
}
|
完成
转自:https://www.cnblogs.com/ping9719/p/14821508.html