C# Linq for xml解析返回空元素
我的xml文件如下所示:C# Linq for xml解析返回空元素,c#,xml,linq,c#-4.0,C#,Xml,Linq,C# 4.0,我的xml文件如下所示: <?xml version="1.0" encoding="utf-8"?> <roulette xmlns="Mechanical" name="Ruleta"> <params name="Mechanical Counters"> <param name="C01"> <comm>30313</comm> <command>INA</com
<?xml version="1.0" encoding="utf-8"?>
<roulette xmlns="Mechanical" name="Ruleta">
<params name="Mechanical Counters">
<param name="C01">
<comm>30313</comm>
<command>INA</command>
<factor>5</factor>
<index>2</index>
<meter>0</meter>
<player>1023</player>
<meterstring>ml_BET</meterstring>
</param>
<param name="C02">
<comm>30313</comm>
<command>INC</command>
<factor>5</factor>
<index>3</index>
<meter>0</meter>
<player>1023</player>
<meterstring>ml_WIN_PAYTABLE</meterstring>
</param>
<param name="C03">
<comm>30313</comm>
<command>INE</command>
<factor>5</factor>
<index>0</index>
<meter>0</meter>
<player>1023</player>
<meterstring>ml_CRE_IN_BA + ml_CRE_IN_REM + ml_CRE_IN_KEY + ml_CRE_IN_TICKET</meterstring>
</param>
<param name="C04">
<comm>30313</comm>
<command>ING</command>
<factor>5</factor>
<index>1</index>
<meter>0</meter>
<player>1023</player>
<meterstring>ml_CRE_OUT_KEY + ml_CRE_OUT_HANDPAY + ml_CRE_OUT_HANDPAYJP + ml_CRE_OUT_REM + ml_CRE_OUT_TICKET</meterstring>
</param>
<param name="Percentage">
<factor>10</factor>
</param>
<param name="WaitAnswer">
<miliseconds>2500</miliseconds>
</param>
</params>
</roulette>
private void radioButton1_Click(object sender, EventArgs e)
{
//loadamo xml dokument
var doc = XDocument.Load("mechanical.xml");
//preberemo prvi element števca C01 comm
var prvi = doc.Descendants("param")
.Where(x => (string)x.Attribute("name") == "C01")
.Elements("comm")
.FirstOrDefault();
if (prvi != null) { textBox1.Text = "Je element"; } else { textBox1.Text = "ni elementa"; }
}
问题是它没有解析出任何内容(var
prvi
为空),但它不应该解析代码。有什么问题 您的xml有一个默认名称空间xmlns=“Mechanical”
。要访问元素,必须指定名称空间
XNamespace ns = "Mechanical";
var prvi = doc.Descendants(ns + "param")
.Where(x => (string)x.Attribute("name") == "C01")
.Elements(ns + "comm")
.FirstOrDefault();
请注意,默认名称空间不会直接应用于属性
有关更多信息,请参阅。Tnx,现在工作正常!当我查看一个xml文件时,我在哪里可以看到它有一个名称空间?谢谢你的回答和帮助,真的帮了我大忙!