#region 截取字符串
/// <summary>
/// 截取字符串
/// </summary>
/// <param name="len">截取长度</param>
/// <param name="symbol">需截取字符串</param>
/// <returns></returns>
public static String GetLimitLengthString(int length, String str)
{
str = NoHTML(str);
string temp = str;
int j = 0;
int k = 0;
for (int i = 0; i < temp.Length; i++)
{
if (Regex.IsMatch(temp.Substring(i, 1), @"[\u4e00-\u9fa5]+"))
{
j += 2;
}
else
{
j += 1;
}
if (j <= length)
{
k += 1;
}
if (j >= length)
{
return temp.Substring(0, k) + "...";
}
}
return temp;
}
#endregion

#region 过滤掉HTML标签
/// <summary>
/// 过滤掉HTML标签
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static string NoHTML(string str)
{
str = Regex.Replace(str, @"(\<.[^\<]*\>)", " ", RegexOptions.IgnorePatternWhitespace | RegexOptions.IgnoreCase);
str = Regex.Replace(str, @"(\<\/[^\<]*\>)", " ", RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);
str = Regex.Replace(str, " ", "");
return str;
}
#endregion