我需要使用asp.net/
C#渲染一个无序列表,其中包含从数据库获得的数据.我的数据看起来像这样.
id Name Depth 1 ELECTRONICS 0 2 TELEVISIONS 1 3 Tube 2 4 LCD 2 5 Plasma 2 6 Portable electronics 1 7 MP3 Player 2 8 Flash 3 9 CD Players 2 10 2 Way Radio 2
使用上面的示例数据,我需要根据深度呈现无序列表,格式如下
<ul>
<li>ELECTRONICS
<ul>
<li>TELEVISIONS
<ul>
<li>TUBE</li>
<li>LCD</li>
<li>PLASMA</li>
</ul>
</li>
<li>PORTABLE ELECTRONICS
<ul>
<li>MP3 PLAYERS
<ul>
<li>FLASH</li>
</ul>
</li>
<li>CD PLAYERS</li>
<li>2 WAY RAdioS</li>
</ul>
</li>
</ul>
</li>
</ul>
上面的数据只是一个示例,我有一个巨大的记录集,必须转换为无序列表.有人可以给我一个如何实现这一点的想法吗？
int lastDepth = -1;
int numUL = 0;
StringBuilder output = new StringBuilder();
foreach (DataRow row in ds.Tables[0].Rows)
{
int currentDepth = Convert.ToInt32(row["Depth"]);
if (lastDepth < currentDepth)
{
if (currentDepth == 0)
{
output.Append("<ul class=\"simpleTree\">");
output.AppendFormat("<li class=\"root\"><span><a href=\"#\" title=\"root\">root</a></span><ul><li class=\"open\" ><span><a href=\"#\" title={1}>{0}</a></span>",row["name"],row["id"]);
}
else
{
output.Append("<ul>");
if(currentDepth==1)
output.AppendFormat("<li><span>{0}</span>",row["name"]);
else
output.AppendFormat("<li><span class=\"text\"><a href=\"#\" title={1}>{0}</a></span>",row["id"]);
}
numUL++;
}
else if (lastDepth > currentDepth)
{
output.Append("</li></ul></li>");
if(currentDepth==1)
output.AppendFormat("<li><span>{0}</span>",row["name"]);
else
output.AppendFormat("<li><span class=\"text\"><a href=\"#\" title={1}>{0}</a></span>",row["id"]);
numUL--;
}
else if (lastDepth > -1)
{
output.Append("</li>");
output.AppendFormat("<li><span class=\"text\"><a href=\"#\" title={1}>{0}</a></span>",row["id"]);
}
lastDepth = currentDepth;
}
for (int i = 1; i <= numUL+1; i++)
{
output.Append("</li></ul>");
}
使用上面的代码,我的无序列表看起来像这样.
<ul class="simpleTree"> <li class="root"> <span><a href="#" title="root">root</a></span> <ul> <li class="open" > <span><a href="#" title=1>ELECTRONICS</a></span> <ul> <li> <span>TELEVISIONS</span> <ul> <li> <span class="text"><a href="#" title=3>TUBE</a></span> </li> <li> <span class="text"><a href="#" title=4>LCD</a></span> </li> <li><span class="text"><a href="#" title=5>PLASMA</a></span> </li> </ul> </li> <li> <span>PORTABLE ELECTRONICS</span> <ul> <li> <span class="text"><a href="#" title=7>MP3 PLAYERS</a></span> <ul> <li> <span class="text"><a href="#" title=8>FLASH</a></span> </li> </ul> </li> <li> <span class="text"><a href="#" title=9>CD PLAYERS</a></span> </li> <li> <span class="text"><a href="#" title=10>2 WAY RAdioS</a></span> </li> </ul> </li></ul> </li></ul> </li></ul>
谢谢.
解决方法
您可以在代码中执行类似的操作,然后将结果输出到页面上的Literal控件：
int lastDepth = -1;
int numUL = 0;
StringBuilder output = new StringBuilder();
foreach (DataRow row in yourDataTable.Rows) {
int currentDepth = row["Depth"];
if (lastDepth < currentDepth) {
output.append("<ul>");
numUL++
}
else if (lastDepth > currentDepth) {
output.append("</li></ul></li>");
numUL--
}
else if (lastDepth > -1) {
output.append("</li>");
}
output.appendformat("<li class=\"depth-{1}\">{0}",currentDepth);
lastDepth = currentDepth;
}
for (int i = 1;i <= numUL;i++)
{
output.append("</li></ul>");
}
yourLiteralControl.Text = output.toString();
更新：我这样做是为了在注释中请求的深度相关的列表项中放入一个css类.
