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一、窗体编辑和P图
1.插入图片
插入PictureBox控件
Image属性选择图片
SizeMode->StretchImage
2.窗体属性
ShowInTaskbar->False
TopMost->True
Cursor->SizeAll（选做）
FormBoarderStyle->None
3.添加显示流量的数字
插入Label控件
Text->”0.00B”
Font->加粗、小四
二、添加界面功能
1.鼠标拖拽
选中窗体Form1，点击属性窗口小闪电图标，找到MouseDown事件，双击
在生成的函数中，添加以下代码:

ReleaseCapture();
SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);

在private void Form1_MouseDown(object sender, MouseEventArgs e)上方，添加以下代码

[DllImport("user32.dll")]
public static extern bool ReleaseCapture();
[DllImport("user32.dll")]
public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
public const int WM_SYSCOMMAND = 0x0112;
public const int SC_MOVE = 0xF010;
public const int HTCAPTION = 0x0002;
public static float send = 0;
public static float recieve = 0;
public static float netRecv;
public static float netSend;

为了使拖拽更灵敏，可以给两张图片、0.00B字体，添加同样的MouseDown事件，并添加代码
2.窗口初始显示位置
双击窗体Form1，在生成的private void Form1_Load(object sender, EventArgs e)函数中添加

Control.CheckForIllegalCrossThreadCalls = false;
timer1.Start();
int x = System.Windows.Forms.Screen.PrimaryScreen.WorkingArea.Size.Width - 280;
int y = System.Windows.Forms.Screen.PrimaryScreen.WorkingArea.Size.Height - 125;
this.SetDesktopLocation(x, y);

3.窗体圆角
选中窗体Form1，点击属性窗口小闪电图标，找到Resize事件，双击
在生成的函数中，添加以下代码

System.Drawing.Drawing2D.GraphicsPath FormPath;
FormPath = new System.Drawing.Drawing2D.GraphicsPath();
Rectangle rect = new Rectangle(0, 0, this.Width, this.Height);
FormPath = GetRoundedRectPath(rect, 40);
this.Region = new Region(FormPath);
在private void Form1_Resize(object sender, EventArgs e)函数上方，添加如下代码
private GraphicsPath GetRoundedRectPath(Rectangle rect, int radius)
{
    int diameter = radius;
    Rectangle arcRect = new Rectangle(rect.Location, new Size(diameter, diameter));
    GraphicsPath path = new GraphicsPath(); path.AddArc(arcRect, 180, 90);//左上角                       
    arcRect.X = rect.Right - diameter;//右上角       
    path.AddArc(arcRect, 270, 90);
    arcRect.Y = rect.Bottom - diameter;// 右下角
    path.AddArc(arcRect, 0, 90);
    arcRect.X = rect.Left;// 左下角
    path.AddArc(arcRect, 90, 90);
    path.CloseFigure();
    return path;
}

三、添加流量监控功能
1.添加定时器控件
添加Timer，修改Timer的属性，达到每1S读取一次流量的效果
Interval->1000
2.添加定时时间
单击选中Timer，点击属性窗口小闪电图标，找到Tick事件，双击
在生成的函数里面，添加如下代码

netRecv = NetMonitorCore.GetNetRecv();
netSend = NetMonitorCore.GetNetSend();
send = netSend / 1024;
recieve = netRecv / 1024;
string netRecvText = "";
string netSendText = "";
if (netRecv < 1024)
{
    netRecvText = netRecv.ToString("0.00") + "B";
}
else if (netRecv >= 1024 && netRecv < 1024 * 1024)
{
    netRecvText = (netRecv / 1024).ToString("0.00") + "KB";
}
else if (netRecv >= 1024 * 1024)
{
    netRecvText = (netRecv / (1024 * 1024)).ToString("0.00") + "MB";
}
if (netSend < 1024)
{
    netSendText = netSend.ToString("0.00") + "B";
}
else if (netSend >= 1024 && netSend < 1024 * 1024)
{
    netSendText = (netSend / 1024).ToString("0.00") + "KB";
}
else if (netSend >= 1024 * 1024)
{
    netSendText = (netSend / (1024 * 1024)).ToString("0.00") + "MB";
}
label1.Text = netSendText;
label2.Text = netRecvText;

3.添加NetMonitorCore.cs文件
首先将NetMonitorCore.cs文件复制粘贴到工程目录中，接着在解决方案资源管理器项目上，右键选择添加->现有项
最后选择NetMonitorCore.cs文件完成添加

四、添加通道选择及退出功能
1.通道选择功能
（1）添加ContextMenuStrip，添加通道0-6和退出选项
（2）修改窗体Form1、两张图片、0.00B的属性，将ContextMenuStrip中选择contextMenuStrip1
（3）双击通道0，在生成的函数上方，添加如下函数代码

private void NetRestart(int num)
{
    NetMonitorCore.performanceCounterCategory = new PerformanceCounterCategory("Network Interface");
try
{
    NetMonitorCore.instance = NetMonitorCore.performanceCounterCategory.GetInstanceNames()[num];
}
catch
{
    MessageBox.Show("此通道不通哦~");
}
   NetMonitorCore.interfaceLength = NetMonitorCore.instance.Length;
   NetMonitorCore.performanceCounterRecv = new PerformanceCounter("Network Interface", "Bytes Received/sec", NetMonitorCore.instance);
   NetMonitorCore.performanceCounterSend = new PerformanceCounter("Network Interface", "Bytes Sent/sec", NetMonitorCore.instance);
}

（4）在通道0生成的函数private void 通道0ToolStripMenuItem_Click(object sender, EventArgs e)中
添加如下代码
NetRestart(0);
同样，在双击“通道1”生成的函数中，添加NetRestart(1); 依次类推
2.退出功能
双击“退出”，在生成的函数中，添加如下代码

SystemSounds.Beep.Play();
DialogResult r = MessageBox.Show("主银，辣么萌的流量悬浮窗您要狠心退出么/(ㄒoㄒ)/~~", "提示", MessageBoxButtons.OKCancel);
if (r == DialogResult.OK)
{
    Application.Exit();
}