C#页码导航显示及算法实现代码_实用技巧

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页码导航,先看显示效果:

算法要求
1、页数小于等于1时不显示;
2、页数大于10时,自动缩短。
具体代码如下:

/// <summary>
/// 获取分页导航
/// </summary>
/// <param name="intPageIndex">页码</param>
/// <param name="intPageCount">页数</param>
/// <param name="strUrl">链接</param>
/// <returns>HTML代码</returns>
private string GePageNavgation(int intPageIndex, int intPageCount, string strUrl)
{
StringBuilder sb = new StringBuilder("<div class=\"div_pagenavgation\">");
if (intPageCount > 1)
{
//页码显示
if (intPageIndex == 1)
{
sb.Append("<span class=\"disabled\"> < 上一页</span>");
}
else if (intPageIndex > 1)
{
sb.Append("<a href=\"" + strUrl + (intPageIndex - 1).ToString() + "\">< 上一页</a>");
}
bool Dot1 = false, Dot2 = false;
for (int i = 1; i <= intPageCount; i++)
{
if (i == intPageIndex)
{
sb.Append("<span class=\"current\">" + intPageIndex.ToString() + "</span>");
continue;
}
if (i <= 3)
{
sb.Append("<a href=\"" + strUrl + i.ToString() + "\">" + i.ToString() + "</a>");
continue;
}
if (intPageIndex > 7)
{
if (!Dot1)
{
sb.Append("<span class=\"dotted\">...</span>");
Dot1 = true;
}
}
if (i == intPageIndex - 3)
{
sb.Append("<a href=\"" + strUrl + i.ToString() + "\">" + i.ToString() + "</a>");
continue;
}
if (i == intPageIndex - 2)
{
sb.Append("<a href=\"" + strUrl + i.ToString() + "\">" + i.ToString() + "</a>");
continue;
}
if (i == intPageIndex - 1)
{
sb.Append("<a href=\"" + strUrl + i.ToString() + "\">" + i.ToString() + "</a>");
continue;
}
if (i == intPageIndex + 1)
{
sb.Append("<a href=\"" + strUrl + i.ToString() + "\">" + i.ToString() + "</a>");
continue;
}
if (i == intPageIndex + 2)
{
sb.Append("<a href=\"" + strUrl + i.ToString() + "\">" + i.ToString() + "</a>");
continue;
}
if (i == intPageIndex + 3)
{
sb.Append("<a href=\"" + strUrl + i.ToString() + "\">" + i.ToString() + "</a>");
continue;
}
if ((intPageCount - intPageIndex) > 6 && i > intPageIndex + 3)
{
if (!Dot2)
{
sb.Append("<span class=\"dotted\">...</span>");
Dot2 = true;
}
}
if (i > intPageCount - 3)
{
sb.Append("<a href=\"" + strUrl + i.ToString() + "\">" + i.ToString() + "</a>");
continue;
}
}
if (intPageIndex == intPageCount)
{
sb.Append("<span class=\"disabled\">下一页 ></span>");
}
else if (intPageIndex + 1 <= intPageCount)
{
sb.Append("<a href=\"" + strUrl + (intPageIndex + 1).ToString() + "\">下一页 ></a>");
}
}
sb.Append("</div>");
return sb.ToString();
}

CSS样式:

.div_pagenavgation{
margin-top:5px;
line-height:20px;
float:right;
}
.div_pagenavgation a{
float:left;
text-decoration:none;
color:#06F;
margin-left:5px;
padding-left:5px;
padding-right:5px;
height:20px;
text-align:center;
display:block;
border:1px #CCC solid;
}
.div_pagenavgation .dotted{
float:left;
}
.div_pagenavgation .current{
float:left;
margin-left:5px;
padding-left:5px;
padding-right:5px;
height:20px;
text-align:center;
display:block;
border:1px #CCC solid ;
background-color:#0080C0;
color:#FFF;
}
.div_pagenavgation .disabled{
float:left;
margin-left:5px;
padding-left:5px;
padding-right:5px;
height:20px;
text-align:center;
display:block;
border:1px #CCC solid;
color:#CCC;
}

产生的HTML如下:

<div class="div_pagenavgation">
<a href="?m=log&page=11">< 上一页</a>
<a href="?m=log&page=1">1</a>
<a href="?m=log&page=2">2</a>
<a href="?m=log&page=3">3</a>
<span class="dotted">...</span>
<a href="?m=log&page=9">9</a>
<a href="?m=log&page=10">10</a>
<a href="?m=log&page=11">11</a>
<span class="current">12</span>
<a href="?m=log&page=13">13</a>
<a href="?m=log&page=14">14</a>
<a href="?m=log&page=15">15</a>
<span class="dotted">...</span>
<a href="?m=log&page=27">27</a>
<a href="?m=log&page=28">28</a>
<a href="?m=log&page=29">29</a>
<a href="?m=log&page=13">下一页 ></a>
</div>

说明:很久前赶工完成,基本能够实现要求,没有经过仔细优化,谁优化了再回复看看!
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