asp.Net(記事の切り取りの前の行をリストの要約として)はHTMLコードを無損に返します
7085 ワード
/* , , , , ok 。
* :
* : HTML
*
* : Kas(QQ:10590916)
* :2010-12-13、
*/
public static string LeftH(string str, int l)
{
//
string odstr = str;
bool isHtml = false;//
int maxLen = str.Length;
int n = 0, i = 0, b = 0, e = 0;
string c, c2 = "", Start = "", EndLabel = "", AllLabel = "";
if (l >= str.Length) return str;//
bool isErr = false;
try
{
while (n < l && i < maxLen)
{
//1
i++;
c = str.Substring(i - 1, 1);
string end2str = "";
try
{
end2str = str.Substring(i - 1, 2);
}
catch
{
end2str = "";
}
if (c == " {
isHtml = true;
b = i;//
//5
string end2tag = "";
try
{
end2tag = str.Substring(i, 2);
}
catch
{
end2tag = "";
}
if (end2tag == "br")
{
isHtml = false;
}
if (str.Substring(i, 1).ToLower() == "%")
{
isHtml = false;
}
if (str.Substring(i, 1).ToLower() == "?")
{
isHtml = false;
}
else if (end2tag == "hr")
{
isHtml = false;
}
//5end
}
//1end
//2
if (c == " {
c2 = str.Substring(i - 1, str.Substring(i - 1).IndexOf(">") + 1);
AllLabel = AllLabel.Substring(c2.Length);
}
//2end
Start = Start + c;//
if (!isHtml)
{
//6
try
{
if (str.Substring(i, 2).ToLower() == "br")
{
}
else if (str.Substring(i, 2).ToLower() == "hr")
{
}
else
{
n++;
}
}
catch
{
// , (@"]+>|[^>]+>");
//odstr = Regex.Replace(odstr, @"]+>|[^>]+>", "", RegexOptions.IgnoreCase);
odstr = odstr.Replace("", ">");
if (l > odstr.Length) l = odstr.Length;
return odstr.Substring(0, l);
}
//6end
}
else
{
if (c == ">")// > ,
{
if (isHtml)
{
EndLabel = str.Substring(b, i - b);//
e = EndLabel.IndexOf(" ");// , ,
if (e > 0)
{
EndLabel = "" + EndLabel.Substring(0, e) + ">";
}
else
{
EndLabel = "" + EndLabel;
}
AllLabel = EndLabel + AllLabel;// ,
}
isHtml = false;// ,
}
}
//4 , ,
if (n + 1 >= l)
{
if (InStrN(Start, ""))
{
n--;
}
}
//4end
}//end while
}
catch
{
isErr = true;
}
string newReString = Start + AllLabel + "...";
//
Regex Rg = new Regex("<.>/]+>", RegexOptions.Compiled);
Regex Rg2 = new Regex(@"", RegexOptions.Compiled);
if (inStrLen(newReString, ""))
{
isErr = true;
}
else if (inStrLen(newReString.Replace(""", "\""), "\"") % 2 == 1)
{
isErr = true;
}
else if (Rg.Matches(newReString).Count != Rg2.Matches(newReString).Count)
{
isErr = true;
}
if (isErr)
{
odstr = odstr.Replace("", ">").Replace("\"", """).Replace("'", "'");
if (l > odstr.Length)
{ newReString = odstr; }
else
{
try
{
newReString = odstr.Substring(0, l) + "...";
}
catch
{
newReString = odstr;
}
}
}
return newReString;//
}