C# 拼接字符串，自实现翻页功能

主要为实现类例这样的功能

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/// <summary>
/// 返回生成后的页面部分
/// </summary>
/// <param name="pagenum">当前页号</param>
/// <param name="Invitataion">当前贴子号</param>
public static StringBuilder pagePart(int PageNum,string Invitataion,int PageSize,string platename)
{
    IForum_Answer access = new IForum_Answer();
    StringBuilder pp = new StringBuilder();
    pp.Append("<table><tr>");
//回复总个数
    int cc = access.GetAnswerCount(Invitataion);
    double count = access.GetAnswerCount(Invitataion)+0.1;
    int PageNumCount;

// if (Convert.ToInt32(count / PageSize) == 1) 
// {
// PageNumCount = 2;
// }
////得到总回复页数
// else
    PageNumCount = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(count / PageSize)));
    if (PageNum < 5)
    {
//1到7或到末// 
        int end=(PageNumCount < 7) ? PageNumCount : 7;
        for (int i = 1; i <= end; i++)
        {

            string td = "<td><a href=\"" + Invitataion + "-" + i + ".html\" name=\"locaid\">" + i + "</a></td>";

//string td = "<td><a href=\"http://www.cnblogs.com/StaticPage/ThreePage/"+platename+"/" + Invitataion + "-" + i + ".html\" name=\"locaid\">" + i + "</a></td>";
            pp.Append(td);
        }
//从1到END
//当总页号大于7时,页后加...
        if (PageNumCount > 7)
        {
// pp.Append("<td>...</td><td><a href=\"http://www.cnblogs.com/StaticPage/ThreePage/"+platename+"/" + Invitataion + "-" + PageNumCount + ".html\" name=\"locaid\">" + PageNumCount + "</a></td>"); 
            pp.Append("<td>...</td><td><a href=\"" + Invitataion + "-" + PageNumCount + ".html\" name=\"locaid\">" + PageNumCount + "</a></td>");

        }
        pp.Append("</tr></table>");
        return pp;
    }
    else if (PageNum > (PageNumCount - 5 + 1))
    {
        int begin = (PageNumCount > 7) ? (PageNumCount - 7 + 1) : 2;
//当页前加1...
//pp.Append("<td><a href=\"http://www.cnblogs.com/StaticPage/ThreePage/" + platename + "/" + Invitataion + "-1.html\" name=\"locaid\">1</a></td><td>...</td>");
        pp.Append("<td><a href=\""+ Invitataion + "-1.html\" name=\"locaid\">1</a></td><td>...</td>");

//for (int i = (PageNumCount - 7 + 1); i <= PageNumCount;i++ )
        for (int i = begin; i <= PageNumCount; i++)
//for (int i = (PageNumCount - 4 + 1); i <= PageNumCount;i++ )

        {
//string td = "<td><a href=\"http://www.cnblogs.com/StaticPage/ThreePage/" + platename + "/" + Invitataion + "-" + i + ".html\" name=\"locaid\">" + i + "</a></td>";
            string td = "<td><a href=\"" + Invitataion + "-" + i + ".html\" name=\"locaid\">" + i + "</a></td>";

            pp.Append(td);
        }
//从倒数7到末
//int begin=((PageNumCount-7+1)<)
//PageNumCount-7+1到PageNumCount
        pp.Append("</tr></table>");
        return pp;
    }
//在开头和尾之间
    else {
//pp.Append("<td><a href=\"http://www.cnblogs.com/StaticPage/ThreePage/" + platename + "/" + Invitataion + "-1.html\" name=\"locaid\">1</a></td><td>...</td>");
        pp.Append("<td><a href=\"" + Invitataion + "-1.html\" name=\"locaid\">1</a></td><td>...</td>");

        for (int i = PageNum - 3; i <= PageNum + 3; i++)
        {
//string td = "<td><a href=\"http://www.cnblogs.com/StaticPage/ThreePage/" + platename + "/" + Invitataion + "-" + i + ".html\" name=\"locaid\">" + i + "</a></td>";
            string td = "<td><a href=\"" + Invitataion + "-" + i + ".html\" name=\"locaid\">" + i + "</a></td>";

            pp.Append(td);
        }
//从PageNum-3到PageNum+3
//pp.Append("<td>...</td><td><a href=\"http://www.cnblogs.com/StaticPage/ThreePage/" + platename + "/" + Invitataion + "-" + PageNumCount + ".html\" name=\"locaid\">" + PageNumCount + "</a></td></tr></table>");
        pp.Append("<td>...</td><td><a href=\"" + Invitataion + "-" + PageNumCount + ".html\" name=\"locaid\">" + PageNumCount + "</a></td></tr></table>");
        return pp;
    }
}