C# 通过HttpWebRequest 创建连接获取文件大小 判断Http类型的文件是否存在

public void DisposeReportData(SynFileInfo item)
{
MReport report = new MReport();
report.文件名 = item.DocName;
report.URL = item.DownPath;
HttpWebRequest request = null;
HttpWebResponse response = null;
try
{
request = WebRequest.Create(item.DownPath) as HttpWebRequest;
request.Proxy = null;//不使用代理 .NET4.0中的默认代理是开启的
request.KeepAlive = false;//不建立持久性连接
request.Timeout = 5000;//连接网址的超时时间
request.ReadWriteTimeout = 5000;//读取网址内容的超时时间
response = request.GetResponse() as HttpWebResponse;
long length = response.ContentLength;
string size = FileOperate.GetAutoSizeString(length, 2);
report.大小 = size;
report.连接状态 = "有 效";
}
catch (WebException webEx)
{
report.大小 = "0 MB";
report.连接状态 = "无 效";
Console.WriteLine("请求的文件不存在!" + webEx.Message);
}
finally
{
lock (ConfigReader.ReportData)
{
ConfigReader.ReportData.Add(report);
}
if (response != null)
{
response.Close();//关闭连接
}
if (request != null)
{
request.Abort();//中止请求
}
request = null;
response = null;
System.GC.Collect();//强制垃圾回收,并释放资源

}
}