使用XPath查詢XML文檔對象

Question

我目前有一個帶提交按鈕和兩個電話號碼和郵編的文本字段的webpart。當電話號碼和郵編輸入文本文件並按下提交時，我希望能夠提交查詢字符​​串和外部API，然後在XML文檔對象的表單中返回查詢結果。然後，我需要使用XPath查詢此對象以顯示結果，然後格式化或將此結果轉換爲HTML。 首先：

1. 我所創建的XML文檔對象（一類），但我也不太清楚，然後如何使用XPath檢索結果查詢此對象。

2. 我也不太清楚如何連接起來的提交按鈕執行上面提到的XMLDocument對象的查詢字符串。

下面是XmlDocument對象，將查詢外部API，並返回結果中有代碼中沒有錯誤sugesting一切都很好，到目前爲止：

using System; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Xml; // needed for the XML document object 
using System.Xml.XPath; //needed to use Xpath to query the XMLDocument object 
using System.Xml.Xsl; //needed to convert xml into HTML hopefully 


namespace ACWebPart.VisualWebPart1 
{ 
public partial class VisualWebPart1UserControl : UserControl 
{ 


private XmlDocument performXmlCheck(string user, string pass, string phone, string postcode, 
string checks, string options) 
{ 
//creating the XMLDocument object 
XmlDocument xml = new XmlDocument(); 

//creating the query to run against the server 
string url = String.Format("http://api.samknows.com/checker.do?user= {0} &pass={1} &phone={2} 
&postcode={3} &checks={4} &options={5} &output=xml", user, pass, phone, postcode, checks, 
options); 

//to catch errors a try and catch will be created 
try 
{ 
//querying the server, parse the XML and store it 
xml.Load(url); 
} 

catch 
{ 
//if an execption is encountered (Server unreachable, HTTP500, HTTP 404, etc) return null 
return null; 
} 

return xml; 

} 


protected void Page_Load(object sender, EventArgs e) 
{ 
//creating the event habdler for the submit button 
cmdSubmit.Click += new EventHandler(cmdSubmit_Click); 

//Live validation of input text boxes to ensure they are not empty and have the correct input 
format 
TextBox1.Attributes.Add("OnFocus", "if(this.value == 'Phone number') {this.value='', 
this.style.borderColor='#c4c4c4', this.style.color='#676767', this.style.fontStyle='normal'};"); 
TextBox1.Attributes.Add("OnBlur", "if(this.value == '') {this.value='Phone number', 
this.style.color='red', this.style.fontStyle='italic', this.style.borderColor='red'};"); 

TextBox2.Attributes.Add("OnFocus", "if(this.value == 'Postcode's) {this.value='', 
this.style.borderColor='#c4c4c4', this.style.color='#676767', this.style.fontStyle='normal'};"); 
TextBox2.Attributes.Add("OnBlur", "if(this.value == '') {this.value='Postcode', 
this.style.color='red', this.style.fontStyle='italic', this.style.borderColor='red'};");  

} 




void cmdSubmit_Click(object sender, EventArgs e) 
{ 







} 

} 
} 

還沒有在2010年的Sharepoint做了很多與XML所以任何幫助和協助與上述第1點和第2點將非常感謝！

在此先感謝

Answer 1

要使用XPath，你可以使用的方法SelectSingleNode和SelectNodes在XmlDocument選擇節點。