如何使用XMLReader來解析XML文檔？

Question

這裏是我的XML：

http://simon.ist.rit.edu:8080/Services/resources/ESD/OrgTypes/

我希望能夠抓住這些鍵盤的「類型」下，而忽略的數字。

如醫生，救護車等

<data> 
<row> 
<typeId>0</typeId> 
<type>Physician</type> 
</row> 
<row> 
<typeId>1</typeId> 
<type>Ambulance</type> 
</row> 
<row> 
<typeId>2</typeId> 
<type>Fire Department</type> 
</row> 
<row> 
<typeId>3</typeId> 
<type>Helicopter/Air Transport</type> 
</row> 
</data> 

我怎麼會做，在C＃？

Answer 1

var types = XDocument.Load("http://simon.ist.rit.edu:8080/Services/resources/ESD/OrgTypes/") 
       .Descendants("type") 
       .Select(t => (string)t) 
       .ToList(); 

Answer 2

這種方法實在是不完整的，不愧爲C＃和一些解釋初學者LINQ到XML：

var types = XDocument.Load("http://simon.ist.rit.edu:8080/Services/resources/ESD/OrgTypes/") 
       .Descendants("type") 
       .Select(t => (string)t) // under the hood magic 
       .ToList(); 

採用(string)投是有點神奇而沒有得到如果使用ToString()，則結果相同。我將解釋......我修改了XML只是一個小：該(string)投上t作用於發動機罩下的t.Value

<type attrib="bar" attrib2="boo" >Resource 
    <foo a="1" a.2="A"/> 
</type> 
// note, I also removed the value of type immediately following Resource node 

。如果不投，結果是：

<type>Physician</type> 
<type>Ambulance</type> 
<type>Fire Department</type> 
<type>Helicopter/Air Transport</type> 
<type>Home Care Agency</type> 
<type>Hospital</type> 
<type>Law Enforcement Agency</type> 
<type>Nursing Home</type> 
<type attrib="bar" attrib2="boo">Resource 
       <foo a="1" a.2="A" /></type> 
<type></type> 
<type>Other</type> 
<type>Hospice</type> 
<type>School</type> 
<type>Emergency Shelter</type> 

使用(string)t：

Physician 
Ambulance 
Fire Department 
Helicopter/Air Transport 
Home Care Agency 
Hospital 
Law Enforcement Agency 
Nursing Home 
Resource 


Other 
Hospice 
School 
Emergency Shelter 

而且t.Value：

Physician 
Ambulance 
Fire Department 
Helicopter/Air Transport 
Home Care Agency 
Hospital 
Law Enforcement Agency 
Nursing Home 
Resource 


Other 
Hospice 
School 
Emergency Shelter 

最後，表明t.ToString()不同於(string)t：

<type>Physician</type> 
<type>Ambulance</type> 
<type>Fire Department</type> 
<type>Helicopter/Air Transport</type> 
<type>Home Care Agency</type> 
<type>Hospital</type> 
<type>Law Enforcement Agency</type> 
<type>Nursing Home</type> 
<type attrib="bar" attrib2="boo">Resource 
       <foo a="1" a.2="A" /></type> 
<type></type> 
<type>Other</type> 
<type>Hospice</type> 
<type>School</type> 
<type>Emergency Shelter</type> 

所有這些都重申了一些鮮爲人知的問題與LINQ-to-XML。

我維護的清晰和易於建議是如下：

var types = XDocument.Load("http://simon.ist.rit.edu:8080/Services/resources/ESD/OrgTypes/") 
       .Descendants("type") 
       .Select(t => t.Value) // be explicit about what you want 
       .ToList(); 

您可以搜索任何element或的IEnumerable味道descendant。