使用C#和LINQ以及递归函数生成KML文件
我试图在C#中动态创建一个KML文件。我编写了一个递归函数来实现这一点。然而,输出的结果有一点问题。问题是所有位置标记的结束标记的位置。我真的很困惑。请告诉我递归函数在哪里出错 我的代码:使用C#和LINQ以及递归函数生成KML文件,c#,xml,kml,C#,Xml,Kml,我试图在C#中动态创建一个KML文件。我编写了一个递归函数来实现这一点。然而,输出的结果有一点问题。问题是所有位置标记的结束标记的位置。我真的很困惑。请告诉我递归函数在哪里出错 我的代码: private void xmlBuild() { XDocument doc = new XDocument( new XDeclaration("1.0", "utf-8", ""), new XComment("This is comment by me"),
private void xmlBuild()
{
XDocument doc = new XDocument(
new XDeclaration("1.0", "utf-8", ""),
new XComment("This is comment by me"),
new XElement(ns+"kml",
new XElement(ns+"Document", rec_build())));
doc.Save(Server.MapPath(@"~\App_Data\markers2.xml"));
}
private XElement rec_build()
{
if (iteration != 0)
{
iteration -= 1;
return final_rec = new XElement(ns + "Placemark",
new XAttribute("id", "1"),
new XElement(ns + "title", "something"),
new XElement(ns + "description", "something"),
new XElement(ns + "LookAt",
new XElement(ns + "Longitude", "49.69"),
new XElement(ns + "Latitude", "32.345")), new XElement(ns + "Point", new XElement(ns + "coordinates", "49.69,32.345,0")),rec_build());
}
else
{
return null;
}
}
这是迭代值2的输出:(请注意文件末尾的placemark id=1的结束标记。它应该在placemark id=2的开始标记之前
<?xml version="1.0" encoding="utf-8"?>
<!--This is comment by me-->
<kml xmlns="http://earth.google.com/kml/2.2">
<Document>
<Placemark id="1">
<title>something</title>
<description>something</description>
<LookAt>
<Longitude>49.69</Longitude>
<Latitude>32.345</Latitude>
</LookAt>
<Point>
<coordinates>49.69,32.345,0</coordinates>
</Point>
<Placemark id="1">
<title>something</title>
<description>something</description>
<LookAt>
<Longitude>49.69</Longitude>
<Latitude>32.345</Latitude>
</LookAt>
<Point>
<coordinates>49.69,32.345,0</coordinates>
</Point>
</Placemark>
</Placemark>
</Document>
</kml>
某物
某物
49.69
32.345
49.69,32.345,0
某物
某物
49.69
32.345
49.69,32.345,0
因此,问题是每次递归时,都会将元素添加到新创建的项中。似乎循环的效果更好
基本上,代码就是这样做的:
设置kml外体
第一次调用并将元素(元素1)添加到kml outerboy
第二次呼叫将要素(要素2)添加到要素(要素1)
第三次呼叫将元素(元素3)添加到元素(元素2)
如果您希望执行递归方法而不是循环机制,请传入对外部kml的引用
如果递归就是这样工作的,那么它就更令人困惑了
(如果我有额外的或缺少的括号、逗号或其他项,很抱歉。我没有在此上安装VS)
循环:
private void xmlBuild()
{
XElement documentElement = new XElement(ns + "Document");
for (int i = 0; i < 2; i++)
{
documentElement.Add(rec_build());
}
XDocument doc = new XDocument(
new XDeclaration("1.0", "utf-8", ""),
new XComment("This is comment by me"),
new XElement(ns + "kml", documentElement));
doc.Save(Server.MapPath(@"~\App_Data\markers2.xml"));
}
private XElement rec_build()
{
return new XElement(ns + "Placemark",
new XAttribute("id", "1"),
new XElement(ns + "title", "something"),
new XElement(ns + "description", "something"),
new XElement(ns + "LookAt",
new XElement(ns + "Longitude", "49.69"),
new XElement(ns + "Latitude", "32.345")),
new XElement(ns + "Point",
new XElement(ns + "coordinates", "49.69,32.345,0")));
}
您正在将递归生成元素添加为Placemark而不是Document的子元素。这应该可以做到:
private void xmlBuild()
{
XElement docElement = new XElement(ns + "Document");
XDocument doc = new XDocument(
new XDeclaration("1.0", "utf-8", ""),
new XComment("This is comment by me"),
new XElement(ns + "kml", docElement));
rec_build(docElement);
doc.Save(Server.MapPath(@"~\App_Data\markers2.xml"));
}
private XElement rec_build(XElement docElement)
{
if (iteration != 0)
{
iteration -= 1;
return final_rec = new XElement(ns + "Placemark",
new XAttribute("id", "1"),
new XElement(ns + "title", "something"),
new XElement(ns + "description", "something"),
new XElement(ns + "LookAt",
new XElement(ns + "Longitude", "49.69"),
new XElement(ns + "Latitude", "32.345")),
new XElement(ns + "Point", new XElement(ns + "coordinates", "49.69,32.345,0")));
docElement.Add(final_rec);
rec_build(docElement);
}
else
return null;
}
我试过你的代码,这是我作为输出得到的:我在docElement中有一个小的输入错误。Add(final_rec);call,还没有运行此代码,但在修复输入错误时应该可以工作。我第一次尝试使用FOR循环,但更困惑了,所以我想到了使用递归。你对使用循环有什么建议?我接受了你的建议(调用rec_函数outer kml),但没有得到很好的结果。你还有什么建议?@Amim更新了我的回答。应该可以。我只是在头脑中运行了它(没有ide)。循环版本有问题,但递归函数工作得很好!谢谢!这个递归函数最棒!!
private void xmlBuild()
{
XElement docElement = new XElement(ns + "Document");
XDocument doc = new XDocument(
new XDeclaration("1.0", "utf-8", ""),
new XComment("This is comment by me"),
new XElement(ns + "kml", docElement));
rec_build(docElement);
doc.Save(Server.MapPath(@"~\App_Data\markers2.xml"));
}
private XElement rec_build(XElement docElement)
{
if (iteration != 0)
{
iteration -= 1;
return final_rec = new XElement(ns + "Placemark",
new XAttribute("id", "1"),
new XElement(ns + "title", "something"),
new XElement(ns + "description", "something"),
new XElement(ns + "LookAt",
new XElement(ns + "Longitude", "49.69"),
new XElement(ns + "Latitude", "32.345")),
new XElement(ns + "Point", new XElement(ns + "coordinates", "49.69,32.345,0")));
docElement.Add(final_rec);
rec_build(docElement);
}
else
return null;
}