public static IAsyncResult BeginJoin(AvailableNetworkSession availableSession, AsyncCallback callback, Object asyncState)
{
if (Session != null || AsyncCreateCaller != null || AsyncFindCaller != null || AsyncJoinCaller != null)
{
throw new InvalidOperationException("Only one NetworkSession allowed");
}
if (availableSession == null)
{
throw new ArgumentNullException("availableSession");
}
AsyncJoinCaller = new AsyncJoin(InternalJoin);
IAsyncResult result = null;
try
{
result = AsyncJoinCaller.BeginInvoke(availableSession, callback, asyncState);
}
catch
{
AsyncJoinCaller = null;
throw;
}
return(result);
}
private async void BtnLogin_Click(object sender, EventArgs e)
{
string userName = this.txtUserName.Text.Trim();
if (string.IsNullOrWhiteSpace(userName))
{
MessageBox.Show("请输入用户名！", "提示", MessageBoxButtons.OK);
return;
}
AsyncJoin asyncJoin = new AsyncJoin(this.CeChatRoomService.Join);
await Task.Factory.FromAsync(asyncJoin.BeginInvoke(userName, null, null), asyncJoin.EndInvoke);
// 远程服务User对象赋值
User user = service.GetService <User>();
user.UserName = userName;
this.Visible = false;
// 展示新窗口
service.GetRequiredService <FrmChatting>().Show();
}