当前日期得到本周的开始和结束日期-优快云博客

本文介绍了一个用于获取指定URL源代码的方法，并提供了一种去除HTML标签以提取纯文本内容的技术。此外，还分享了如何计算本周的时间范围。

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/// <summary>
/// 本周起止时间
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
private string weekrange(System.DateTime dt)
{
int weeknow = Convert.ToInt32(dt.DayOfWeek);
int daydiff = (-1) * weeknow;
int dayadd = 6-weeknow;
string datebegin = System.DateTime.Now.AddDays(daydiff).ToString("yyyyMMdd");
string dateend = System.DateTime.Now.AddDays(dayadd).ToString("yyyyMMdd");
return datebegin + " - " +dateend;
}

/// <summary>
/// 返回指定URL的源代码
/// </summary>
/// <param name="url"></param>
private string GetHTML( string url,string tag)
{
byte[] buf = new byte[38192];
System.Net.WebRequest request = WebRequest.Create(url);;
WebResponse response =request.GetResponse();
Stream resStream = response.GetResponseStream();
int count = resStream.Read(buf, 0, buf.Length);
string result = Encoding.Default.GetString(buf, 0, count);
resStream.Close();
Regex reg=new Regex(@"(?<"+tag+">.*?</"+tag+">)",RegexOptions.IgnoreCase);
string output=reg.Match(result).Value;
return StripHTML(output);
}
/// <summary>
/// 去除HTML标记
/// </summary>
/// <param name="strHtml">包括HTML的源码 </param>
/// <returns>已经去除后的文字</returns>
public static string StripHTML(string strHtml)
{
string [] aryReg ={
@"<script[^>]*?>.*?</script>",

@"<(\/\s*)?!?((\w+:)?\w+)(\w+(\s*=?\s*(([""'])(file://[""'tbnr]|[^/7])*?/7|/w+)|.{0})|/s)*?(///s*)?>",
@"([\r\n])[\s]+",
@"&(quot|#34);",
@"&(amp|#38);",
@"&(lt|#60);",
@"&(gt|#62);",
@"&(nbsp|#160);",
@"&(iexcl|#161);",
@"&(cent|#162);",
@"&(pound|#163);",
@"&(copy|#169);",
@"&#(\d+);",
@"-->",
@"<!--.*\n"

};

string [] aryRep = {
"",
"",
"",
"\"",
"&",
"<",
">",
" ",
"\xa1",//chr(161),
"\xa2",//chr(162),
"\xa3",//chr(163),
"\xa9",//chr(169),
"",
"\r\n",
""
};

string newReg =aryReg[0];
string strOutput=strHtml;
for(int i = 0;i<aryReg.Length;i++)
{
Regex regex = new Regex(aryReg[i],RegexOptions.IgnoreCase );
strOutput = regex.Replace(strOutput,aryRep[i]);
}

strOutput.Replace("<","");
strOutput.Replace(">","");
strOutput.Replace("\r\n","");

return strOutput;
}