網頁超連結路徑置換

包仔最近正好在玩網頁串流，其中有一個步驟剛好要判別站台內之超連結，而這些超連結有不同的寫法，有些是絕對路徑有些則是相對路徑，然而如何置換這些路徑且看包仔之分解。

protected void Button1_Click(object sender, EventArgs e)
{
if (this.TextBox1.Text.Trim() != "")
{
string baseURL = "http://www.test.com.tw";
//string FullPath = "http://www.test.com.tw/ch/tset.aspx";
Response.Write(TransLink(baseURL,this.TextBox1.Text.Trim(),this.TextBox2.Text.Trim()));
}
}
private string TransLink(string baseURL, string LinkPath, string FullPath)
{
string AfterTransPath = "";
if (FullPath != "")
{
int PathIndex = FullPath.LastIndexOf("/");
string LastPath = FullPath.Substring(PathIndex + 1);
string RootPath = FullPath.Replace(LastPath, "");
AfterTransPath = RootPath + LinkPath;
}
else
{
if (LinkPath.Substring(0, 1) == "/")//判斷為內部網頁則加入完整網址
{
LinkPath = baseURL + LinkPath;
}
else if (LinkPath.StartsWith("../"))//判斷為內部網頁則加入完整網址
{
//LinkPath = Regex.Match(LinkPath, "(?i)(?/.+)").Groups["tag"].ToString();
LinkPath = Regex.Split(LinkPath, "(?i)(?(^[\\.\\/]+\\/))").GetValue(3).ToString();
LinkPath = baseURL + "/" + LinkPath;
}
else if (LinkPath.IndexOf(":") < linkpath =" Regex.Match(LinkPath,">http://.+/)").Length.ToString();
}
AfterTransPath = LinkPath;
}
return AfterTransPath;
}
}