转载:http://www.cnblogs.com/xienb/p/3443282.html
winform客户端经常需要调用webservice或者WCF进行数据交互,但是远程服务有可能不存在或者服务器不可用,客户端只能通过超时或者捕获到异常感知服务不可用。其实有一个COM借口可用快速的检测检测将要调用服务的状态。右键引用COM组件:Microsoft XML,v3.0,代码如下:
string url = "http://127.0.0.1/MySrv/MsgService.svc";
XMLHTTP http = new XMLHTTP();
try
{
http.open("GET", url, false, null, null);
http.send(url);
int status = http.status;
if (status == 200)
{
Console.WriteLine("成功");
}
else
{
Console.WriteLine("不可用status:"+status.ToString());
}
}
catch
{
Console.WriteLine("不可用");
}
方法二:
/// <summary>
/// 检查WebService是否可用
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
private static bool CheckActiveWebService(string url)
{
try
{
string uri = url + "?wsdl";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
request.UseDefaultCredentials = true;
request.Method = "GET";
request.Timeout = 5000;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
if (response.StatusCode == HttpStatusCode.OK && response.ContentType.Substring(0, 8) == "text/xml")
{
return true;
}
else
{
return false;
}
}
catch (WebException e)
{
System.Diagnostics.Trace.Write(e.Message);
return false;
}
}