获取Windows网络连接状况

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基本思路是封装对于Windows API InternetGetConnectedState 的调用，然后显示在UI上。

UI的基本布局如下：

具体封装实现代码如下：

public partialclass ConnectQualityView

{

#region "Declarations"

string ConnectionQualityString ="Off";

[DllImport("wininet.dll", ExactSpelling=true, CharSet=CharSet.Ansi, SetLastError=true)]

privatestaticexternbool InternetGetConnectedState(refint lpSFlags, int dwReserved);

publicenumInetConnState

{

modem = 0x1,

lan = 0x2,

proxy = 0x4,

ras = 0x10,

offline = 0x20,

configured = 0x40

}

#endregion

#region "Control Methods"

privatevoid ConnectQualityView_Load(object sender, System.EventArgs e)

{

Timer1.Enabled = true;

this.DoubleBuffered =true;

}

privatevoid Timer1_Tick(System.Object sender, System.EventArgs e)

{

lblConnectStatus.Refresh();

bool blnState;

blnState = CheckInetConnection();

}

publicbool CheckInetConnection()

{

long lngFlags;

int temp_int = (int) lngFlags;

if (InternetGetConnectedState(ref temp_int, 0))

{

// True

if (System.Convert.ToBoolean(lngFlags) && System.Convert.ToBoolean(InetConnState.lan))

{

switch (ConnectionQualityString)

{

case"Good":

lblConnectStatus.ForeColor =Color.Green;

lblConnectStatus.Text ="Connection Quality: Good";

ConnectionQualityString ="Good";

break;

case"Intermittent":

lblConnectStatus.ForeColor =Color.Green;

lblConnectStatus.Text ="Connection Quality: Good";

ConnectionQualityString ="Good";

break;

case"Off":

lblConnectStatus.ForeColor =Color.DarkOrange;

lblConnectStatus.Text ="Connection Quality: Intermittent";

ConnectionQualityString ="Intermittent";

break;

}

this.Refresh();

}

elseif (System.Convert.ToInt64(System.Convert.ToBoolean(lngFlags )) & (long)

InetConnState.modem)

{

switch (ConnectionQualityString)

{

case"Good":

lblConnectStatus.ForeColor =Color.Green;

lblConnectStatus.Text ="Connection Quality: Good";

ConnectionQualityString ="Good";

break;

case"Intermittent":

lblConnectStatus.ForeColor =Color.Green;

lblConnectStatus.Text ="Connection Quality: Good";

ConnectionQualityString ="Good";

break;

case"Off":

lblConnectStatus.ForeColor =Color.DarkOrange;

lblConnectStatus.Text ="Connection Quality: Intermittent";

ConnectionQualityString ="Intermittent";

break;

}

elseif (System.Convert.ToInt64(System.Convert.ToBoolean(lngFlags )) & (long)

InetConnState.configured)

{

switch (ConnectionQualityString)

{

case"Good":

lblConnectStatus.ForeColor =Color.Green;

lblConnectStatus.Text ="Connection Quality: Good";

ConnectionQualityString ="Good";

break;

case"Intermittent":

lblConnectStatus.ForeColor =Color.Green;

lblConnectStatus.Text ="Connection Quality: Good";

ConnectionQualityString ="Good";

break;

case"Off":

lblConnectStatus.ForeColor =Color.DarkOrange;

lblConnectStatus.Text ="Connection Quality: Intermittent";

ConnectionQualityString ="Intermittent";

break;

}

elseif (System.Convert.ToInt64(System.Convert.ToBoolean(lngFlags )) & (long) InetConnState.proxy)

{

switch (ConnectionQualityString)

{

case"Good":

lblConnectStatus.ForeColor =Color.Green;

lblConnectStatus.Text ="Connection Quality: Good";

ConnectionQualityString ="Good";

break;

case"Intermittent":

lblConnectStatus.ForeColor =Color.Green;

lblConnectStatus.Text ="Connection Quality: Good";

ConnectionQualityString ="Good";

break;

case"Off":

lblConnectStatus.ForeColor =Color.DarkOrange;

lblConnectStatus.Text ="Connection Quality: Intermittent";

ConnectionQualityString ="Intermittent";

break;

}

elseif (System.Convert.ToInt64(System.Convert.ToBoolean(lngFlags)) & (long) InetConnState.ras)

{

switch (ConnectionQualityString)

{

case"Good":

lblConnectStatus.ForeColor =Color.Green;

lblConnectStatus.Text ="Connection Quality: Good";

ConnectionQualityString ="Good";

break;

case"Intermittent":

lblConnectStatus.ForeColor =Color.Green;

lblConnectStatus.Text ="Connection Quality: Good";

ConnectionQualityString ="Good";

break;

case"Off":

lblConnectStatus.ForeColor =Color.DarkOrange;

lblConnectStatus.Text ="Connection Quality: Intermittent";

ConnectionQualityString ="Intermittent";

break;

}

elseif (System.Convert.ToInt64(System.Convert.ToBoolean(lngFlags )) & (long) InetConnState.offline)

{

switch (ConnectionQualityString)

{

case"Good":

lblConnectStatus.ForeColor =Color.Green;

lblConnectStatus.Text ="Connection Quality: Good";

ConnectionQualityString ="Good";

break;

case"Intermittent":

lblConnectStatus.ForeColor =Color.Green;

lblConnectStatus.Text ="Connection Quality: Good";

ConnectionQualityString ="Good";

break;

case"Off":

lblConnectStatus.ForeColor =Color.DarkOrange;

lblConnectStatus.Text ="Connection Quality: Intermittent";

ConnectionQualityString ="Intermittent";

break;

}

else

{

// False

switch (ConnectionQualityString)

{

case"Good":

lblConnectStatus.ForeColor =Color.DarkOrange;

lblConnectStatus.Text ="Connection Quality: Intermittent";

ConnectionQualityString ="Intermittent";

break;

case"Intermittent":

lblConnectStatus.ForeColor =Color.Red;

lblConnectStatus.Text ="Connection Quality: Off";

ConnectionQualityString ="Off";

break;

case"Off":

lblConnectStatus.ForeColor =Color.Red;

lblConnectStatus.Text ="Connection Quality: Off";

ConnectionQualityString ="Off";

break;

}

#endregion

}