最新下载
热门教程
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
用c#判断远程文件是否存在
时间:2010-04-25 编辑:简简单单 来源:一聚教程网
public static bool IsExist(string uri)
{
HttpWebRequest req = null;
HttpWebResponse res = null;
try
{
req = (HttpWebRequest)WebRequest.Create(uri);
req.Method = "HEAD";
req.Timeout = 100;
res = (HttpWebResponse)req.GetResponse();
return (res.StatusCode == HttpStatusCode.OK);
}
catch
{
return false;
}
finally
{
if (res != null)
{
res.Close();
res = null;
}
if (req != null)
{
; req.Abort();
req = null;
}
}
}
//2:
private bool UrlExistsUsingXmlHttp(string url)
{
//注意:此方法需要引用Msxml2.dll
MSXML2.XMLHTTP _xmlhttp = new MSXML2.XMLHTTPClass();
_xmlhttp.open("HEAD", url, false, null, null);
_xmlhttp.send("");
return (_xmlhttp.status == 200);
}
//3:
private bool UrlExistsUsingSockets(string url)
{
if (url.StartsWith("http://")) url = url.Remove(0, "http://".Length);
try
{
System.Net.IPHostEntry ipHost =System.Net.Dns.GetHostEntry(url);// System.Net.Dns.Resolve(url);
return true;
}
catch (System.Net.Sockets.SocketException se)
{
System.Diagnostics.Trace.Write(se.Message);
return false;
}
}
相关文章
- C#复制数组的两种方式及效率比较解读 10-24
- ASP.NET Identity用法解析 10-24
- ASP.NET MVC使用Identity增删改查用户介绍 10-24
- C语言中atoi函数模拟实现介绍 10-18
- .Net反向代理组件Yarp用法介绍 10-10
- .NET使用YARP通过编码方式配置域名转发实现反向代理教程 10-10