BR> /* STRONG>時間很久遠了,有碼友要,我抄了下來,記得使用的時候還是有部分例外情況要處理,大部分是ok的。/STRONG>
* 函數(shù):
* 說明:無損返回HTML代碼
*
* 作者:卡斯Kas(QQ:10590916)
* 修改:2010-12-13、
*/
public static string LeftH(string str, int l)
{
//為了防止錯誤
string odstr = str;
bool isHtml = false;//判斷截取開頭是否是字符串
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;//截取字段大于字符長度
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 == "" end2str != "/")
{
isHtml = true;
b = i;//記錄一個位置
//5 解決非成對標(biāo)簽
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 == "" end2str == "/")
{
c2 = str.Substring(i - 1, str.Substring(i - 1).IndexOf(">") + 1);
AllLabel = AllLabel.Substring(c2.Length);
}
//2end
Start = Start + c;//記錄當(dāng)前字符及其前面字符
if (!isHtml)
{
//6 較為準(zhǔn)確的計數(shù)
try
{
if (str.Substring(i, 2).ToLower() == "br")
{
}
else if (str.Substring(i, 2).ToLower() == "hr")
{
}
else
{
n++;
}
}
catch
{
//如果出錯,則返回純文本(@"[^>]+>|/[^>]+>");
//odstr = Regex.Replace(odstr, @"[^>]+>|/[^>]+>", "", RegexOptions.IgnoreCase);
odstr = odstr.Replace("", "").Replace(">", ">");
if (l > odstr.Length) l = odstr.Length;
return odstr.Substring(0, l);
}
//6end
}
else
{
if (c == ">")//如果循環(huán)到>時,要處理的成對標(biāo)簽中間部分
{
if (isHtml)
{
EndLabel = str.Substring(b, i - b);//獲取到>之間的代碼
e = EndLabel.IndexOf(" ");//標(biāo)簽屬性都有空格,以空格為分割,獲取標(biāo)簽名
if (e > 0)
{
EndLabel = "/" + EndLabel.Substring(0, e) + ">";
}
else
{
EndLabel = "/" + EndLabel;
}
AllLabel = EndLabel + AllLabel;//記錄當(dāng)前結(jié)束標(biāo)簽,及所有有關(guān)結(jié)束標(biāo)簽
}
isHtml = false;//重置屬性,從新開始
}
}
//4 當(dāng)結(jié)束時,發(fā)現(xiàn)有未閉合的標(biāo)簽,則重新來一次
if (n + 1 >= l)
{
if (InStrN(Start, "") != InStrN(Start, ">"))
{
n--;
}
}
//4end
}//end while
}
catch
{
isErr = true;
}
string newReString = Start + AllLabel + "...";
//最后再次驗證
Regex Rg = new Regex(".[^>/]+>", RegexOptions.Compiled);
Regex Rg2 = new Regex(@"\s*/[a-z]\s*>", RegexOptions.Compiled);
if (inStrLen(newReString, "") != 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("\"", """).Replace("'", "'");
if (l > odstr.Length)
{ newReString = odstr; }
else
{
try
{
newReString = odstr.Substring(0, l) + "...";
}
catch
{
newReString = odstr;
}
}
}
return newReString;//返回
}