/*----------------------------------------------------- 分割线 ----------------------------------------------------------------*/
#region 画板的回调函数实现
/// <summary>
/// 画板：将InkCanvas的墨迹转换为String
/// </summary>
private void ink_MouseUp(object sender, MouseButtonEventArgs e)
{
StrokeCollection sc = inkcanvas.Strokes;
string inkData = (new StrokeCollectionConverter()).ConvertToString(sc);
client.SendInk(roomId, inkData);
}