namespace WebTest
{
public partial class Test : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string content = "<a target=\"_blank\" href=\"Product.aspx?classId=123\"><a target=\"_blank\" href=\"Product-view.aspx\"><a target=\"_blank\" href=\"Product-view.aspx?id=59\"><a target=\"_blank\" href=\"Product-view.aspx?id=11159\">";
string newContent = content;
Regex rg = new Regex("href="); //正则定位到链接
int len = 5; //正则字符长度
MatchCollection mc = rg.Matches(content);
foreach (Match m in mc)
{
int startIndex = m.Index + len + 1; //定位到的URL的起始位置
int endIndex = content.IndexOf("\"", m.Index + len + 1); //定位到的URL的结束位置
string originalURL = content.Substring(startIndex, endIndex - startIndex); //获取到URL的全地址
string newURL = "";
newURL = originalURL.Replace(".aspx?classId=", "-class-"); //产品类型的替换
newURL = newURL.Replace(".aspx?id=", "-"); //产品的替换
newURL = newURL.Replace(".aspx", "");
newURL += ".html";

newContent = newContent.Replace(originalURL +"\"", newURL +"\""); //替换掉原URL地址为静态地址
}

Response.Write(string.Format("原内容：{0}<br/>新内容：{1}", content.Replace("<", "&lt;").Replace(">", "&gt;"), newContent.Replace("<", "&lt;").Replace(">", "&gt;")));
}
}
}