XML文件：
<providers>
<provider>
<name>Gmail</name>
<domain>gmail.com</domain>
<smtp>smtp.gmail.com</smtp>
<ssl>true</ssl>
<smtpport></smtpport>
<sslport>587</sslport>
</provider>
<provider>
<name>Outlook</name>
<domain>live.com</domain>
<smtp>smtp.live.com</smtp>
<ssl>true</ssl>
<sslport>587</sslport>
<smtpport></smtpport>
</provider>
</providers>
C＃来源
// ------------------------------------------------------------------------------
// <auto-generated>
// Generated by Xsd2Code. Version 3.4.0.38967
// <NameSpace>Test</NameSpace><Collection>IList</Collection><codeType>CSharp</codeType><EnableDataBinding>False</EnableDataBinding><EnableLazyLoading>False</EnableLazyLoading><TrackingChangesEnable>False</TrackingChangesEnable><GenTrackingClasses>False</GenTrackingClasses><HidePrivateFieldInIDE>False</HidePrivateFieldInIDE><EnableSummaryComment>False</EnableSummaryComment><VirtualProp>False</VirtualProp><IncludeSerializeMethod>True</IncludeSerializeMethod><UseBaseClass>False</UseBaseClass><GenBaseClass>False</GenBaseClass><GenerateCloneMethod>False</GenerateCloneMethod><GenerateDataContracts>False</GenerateDataContracts><CodeBaseTag>Net35</CodeBaseTag><SerializeMethodName>Serialize</SerializeMethodName><DeserializeMethodName>Deserialize</DeserializeMethodName><SaveToFileMethodName>SaveToFile</SaveToFileMethodName><LoadFromFileMethodName>LoadFromFile</LoadFromFileMethodName><GenerateXMLAttributes>True</GenerateXMLAttributes><EnableEncoding>True</EnableEncoding><AutomaticProperties>False</AutomaticProperties><GenerateShouldSerialize>False</GenerateShouldSerialize><DisableDebug>False</DisableDebug><PropNameSpecified>Default</PropNameSpecified><Encoder>UTF8</Encoder><CustomUsings></CustomUsings><ExcludeIncludedTypes>False</ExcludeIncludedTypes><EnableInitializeFields>True</EnableInitializeFields>
// </auto-generated>
// ------------------------------------------------------------------------------
namespace Test
{
using System;
using System.Diagnostics;
using System.Xml.Serialization;
using System.Collections;
using System.Xml.Schema;
using System.ComponentModel;
using System.IO;
using System.Text;
using System.Xml;
using System.Collections.Generic;
[System.CodeDom.Compiler.GeneratedCodeAttribute("System.Xml", "4.0.30319.233")]
[System.SerializableAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
[System.Xml.Serialization.XmlRootAttribute(Namespace = "", IsNullable = false)]
public partial class Providers
{
private IList<ProvidersProvider> providerField;
private static System.Xml.Serialization.XmlSerializer serializer;
public Providers()
{
this.providerField = new List<ProvidersProvider>();
}
[System.Xml.Serialization.XmlElementAttribute("Provider", Order = 0)]
public IList<ProvidersProvider> Provider
{
get
{
return this.providerField;
}
set
{
this.providerField = value;
}
}
private static System.Xml.Serialization.XmlSerializer Serializer
{
get
{
if ((serializer == null))
{
serializer = new System.Xml.Serialization.XmlSerializer(typeof(Providers));
}
return serializer;
}
}
#region Serialize/Deserialize
/// <summary>
/// Serializes current Providers object into an XML document
/// </summary>
/// <returns>string XML value</returns>
public virtual string Serialize(System.Text.Encoding encoding)
{
System.IO.StreamReader streamReader = null;
System.IO.MemoryStream memoryStream = null;
try
{
memoryStream = new System.IO.MemoryStream();
System.Xml.XmlWriterSettings xmlWriterSettings = new System.Xml.XmlWriterSettings();
xmlWriterSettings.Encoding = encoding;
System.Xml.XmlWriter xmlWriter = XmlWriter.Create(memoryStream, xmlWriterSettings);
Serializer.Serialize(xmlWriter, this);
memoryStream.Seek(0, System.IO.SeekOrigin.Begin);
streamReader = new System.IO.StreamReader(memoryStream);
return streamReader.ReadToEnd();
}
catch (Exception ex) {
System.Windows.Forms.MessageBox.Show(ex.StackTrace );
return "";
}
finally
{
if ((streamReader != null))
{
streamReader.Dispose();
}
if ((memoryStream != null))
{
memoryStream.Dispose();
}
}
}
public virtual string Serialize()
{
return Serialize(Encoding.UTF8);
}
/// <summary>
/// Deserializes workflow markup into an Providers object
/// </summary>
/// <param name="xml">string workflow markup to deserialize</param>
/// <param name="obj">Output Providers object</param>
/// <param name="exception">output Exception value if deserialize failed</param>
/// <returns>true if this XmlSerializer can deserialize the object; otherwise, false</returns>
public static bool Deserialize(string xml, out Providers obj, out System.Exception exception)
{
exception = null;
obj = default(Providers);
try
{
obj = Deserialize(xml);
return true;
}
catch (System.Exception ex)
{
exception = ex;
System.Windows.Forms.MessageBox.Show(ex.StackTrace );
return false;
}
}
public static bool Deserialize(string xml, out Providers obj)
{
System.Exception exception = null;
return Deserialize(xml, out obj, out exception);
}
public static Providers Deserialize(string xml)
{
System.IO.StringReader stringReader = null;
try
{
System.Windows.Forms.MessageBox.Show(xml);
stringReader = new System.IO.StringReader(xml);
return ((Providers)(Serializer.Deserialize(System.Xml.XmlReader.Create(stringReader))));
}
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.StackTrace);
return null;
}
finally
{
if ((stringReader != null))
{
stringReader.Dispose();
}
}
}
/// <summary>
/// Serializes current Providers object into file
/// </summary>
/// <param name="fileName">full path of outupt xml file</param>
/// <param name="exception">output Exception value if failed</param>
/// <returns>true if can serialize and save into file; otherwise, false</returns>
public virtual bool SaveToFile(string fileName, System.Text.Encoding encoding, out System.Exception exception)
{
exception = null;
try
{
SaveToFile(fileName, encoding);
return true;
}
catch (System.Exception e)
{
exception = e;
System.Windows.Forms.MessageBox.Show(e.StackTrace );
return false;
}
}
public virtual bool SaveToFile(string fileName, out System.Exception exception)
{
return SaveToFile(fileName, Encoding.UTF8, out exception);
}
public virtual void SaveToFile(string fileName)
{
SaveToFile(fileName, Encoding.UTF8);
}
public virtual void SaveToFile(string fileName, System.Text.Encoding encoding)
{
System.IO.StreamWriter streamWriter = null;
try
{
string xmlString = Serialize(encoding);
streamWriter = new System.IO.StreamWriter(fileName, false, Encoding.UTF8);
streamWriter.WriteLine(xmlString);
streamWriter.Close();
}
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.StackTrace);
return ;
}
finally
{
if ((streamWriter != null))
{
streamWriter.Dispose();
}
}
}
/// <summary>
/// Deserializes xml markup from file into an Providers object
/// </summary>
/// <param name="fileName">string xml file to load and deserialize</param>
/// <param name="obj">Output Providers object</param>
/// <param name="exception">output Exception value if deserialize failed</param>
/// <returns>true if this XmlSerializer can deserialize the object; otherwise, false</returns>
public static bool LoadFromFile(string fileName, System.Text.Encoding encoding, out Providers obj, out System.Exception exception)
{
exception = null;
obj = default(Providers);
try
{
obj = LoadFromFile(fileName, encoding);
return true;
}
catch (System.Exception ex)
{
exception = ex;
System.Windows.Forms.MessageBox.Show(ex.StackTrace );
return false;
}
}
public static bool LoadFromFile(string fileName, out Providers obj, out System.Exception exception)
{
return LoadFromFile(fileName, Encoding.UTF8, out obj, out exception);
}
public static bool LoadFromFile(string fileName, out Providers obj)
{
System.Exception exception = null;
return LoadFromFile(fileName, out obj, out exception);
}
public static Providers LoadFromFile(string fileName)
{
return LoadFromFile(fileName, Encoding.UTF8);
}
public static Providers LoadFromFile(string fileName, System.Text.Encoding encoding)
{
System.IO.FileStream file = null;
System.IO.StreamReader sr = null;
try
{
file = new System.IO.FileStream(fileName, FileMode.Open, FileAccess.Read);
sr = new System.IO.StreamReader(file, encoding);
string xmlString = sr.ReadToEnd();
sr.Close();
file.Close();
return Deserialize(xmlString);
}
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.StackTrace);
return null;
}
finally
{
if ((file != null))
{
file.Dispose();
}
if ((sr != null))
{
sr.Dispose();
}
}
}
#endregion
}
[System.CodeDom.Compiler.GeneratedCodeAttribute("System.Xml", "4.0.30319.233")]
[System.SerializableAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
public partial class ProvidersProvider
{
private IList<string> itemsField;
private IList<ItemsChoiceType> itemsElementNameField;
private static System.Xml.Serialization.XmlSerializer serializer;
public ProvidersProvider()
{
this.itemsElementNameField = new List<ItemsChoiceType>();
this.itemsField = new List<string>();
}
[System.Xml.Serialization.XmlElementAttribute("domain", typeof(string), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("name", typeof(string), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("smtp", typeof(string), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("smtpport", typeof(string), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("ssl", typeof(string), Order = 0)]
[System.Xml.Serialization.XmlElementAttribute("sslport", typeof(string), Order = 0)]
[System.Xml.Serialization.XmlChoiceIdentifierAttribute("ItemsElementName")]
public IList<string> Items
{
get
{
return this.itemsField;
}
set
{
this.itemsField = value;
}
}
[System.Xml.Serialization.XmlElementAttribute("ItemsElementName", Order = 1)]
[System.Xml.Serialization.XmlIgnoreAttribute()]
public IList<ItemsChoiceType> ItemsElementName
{
get
{
return this.itemsElementNameField;
}
set
{
this.itemsElementNameField = value;
}
}
private static System.Xml.Serialization.XmlSerializer Serializer
{
get
{
if ((serializer == null))
{
serializer = new System.Xml.Serialization.XmlSerializer(typeof(ProvidersProvider));
}
return serializer;
}
}
#region Serialize/Deserialize
/// <summary>
/// Serializes current ProvidersProvider object into an XML document
/// </summary>
/// <returns>string XML value</returns>
public virtual string Serialize(System.Text.Encoding encoding)
{
System.IO.StreamReader streamReader = null;
System.IO.MemoryStream memoryStream = null;
try
{
memoryStream = new System.IO.MemoryStream();
System.Xml.XmlWriterSettings xmlWriterSettings = new System.Xml.XmlWriterSettings();
xmlWriterSettings.Encoding = encoding;
System.Xml.XmlWriter xmlWriter = XmlWriter.Create(memoryStream, xmlWriterSettings);
Serializer.Serialize(xmlWriter, this);
memoryStream.Seek(0, System.IO.SeekOrigin.Begin);
streamReader = new System.IO.StreamReader(memoryStream);
return streamReader.ReadToEnd();
}
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.StackTrace);
return "";
}
finally
{
if ((streamReader != null))
{
streamReader.Dispose();
}
if ((memoryStream != null))
{
memoryStream.Dispose();
}
}
}
public virtual string Serialize()
{
return Serialize(Encoding.UTF8);
}
/// <summary>
/// Deserializes workflow markup into an ProvidersProvider object
/// </summary>
/// <param name="xml">string workflow markup to deserialize</param>
/// <param name="obj">Output ProvidersProvider object</param>
/// <param name="exception">output Exception value if deserialize failed</param>
/// <returns>true if this XmlSerializer can deserialize the object; otherwise, false</returns>
public static bool Deserialize(string xml, out ProvidersProvider obj, out System.Exception exception)
{
exception = null;
obj = default(ProvidersProvider);
try
{
obj = Deserialize(xml);
return true;
}
catch (System.Exception ex)
{
exception = ex;
System.Windows.Forms.MessageBox.Show(ex.StackTrace );
return false;
}
}
public static bool Deserialize(string xml, out ProvidersProvider obj)
{
System.Exception exception = null;
return Deserialize(xml, out obj, out exception);
}
public static ProvidersProvider Deserialize(string xml)
{
System.IO.StringReader stringReader = null;
try
{
stringReader = new System.IO.StringReader(xml);
return ((ProvidersProvider)(Serializer.Deserialize(System.Xml.XmlReader.Create(stringReader))));
}
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.StackTrace);
return null;
}
finally
{
if ((stringReader != null))
{
stringReader.Dispose();
}
}
}
/// <summary>
/// Serializes current ProvidersProvider object into file
/// </summary>
/// <param name="fileName">full path of outupt xml file</param>
/// <param name="exception">output Exception value if failed</param>
/// <returns>true if can serialize and save into file; otherwise, false</returns>
public virtual bool SaveToFile(string fileName, System.Text.Encoding encoding, out System.Exception exception)
{
exception = null;
try
{
SaveToFile(fileName, encoding);
return true;
}
catch (System.Exception e){
System.Windows.Forms.MessageBox.Show(e.StackTrace );
exception = e;
return false;
}
}
public virtual bool SaveToFile(string fileName, out System.Exception exception)
{
return SaveToFile(fileName, Encoding.UTF8, out exception);
}
public virtual void SaveToFile(string fileName)
{
SaveToFile(fileName, Encoding.UTF8);
}
public virtual void SaveToFile(string fileName, System.Text.Encoding encoding)
{
System.IO.StreamWriter streamWriter = null;
try
{
string xmlString = Serialize(encoding);
streamWriter = new System.IO.StreamWriter(fileName, false, Encoding.UTF8);
streamWriter.WriteLine(xmlString);
streamWriter.Close();
}
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.StackTrace);
return;
}
finally
{
if ((streamWriter != null))
{
streamWriter.Dispose();
}
}
}
/// <summary>
/// Deserializes xml markup from file into an ProvidersProvider object
/// </summary>
/// <param name="fileName">string xml file to load and deserialize</param>
/// <param name="obj">Output ProvidersProvider object</param>
/// <param name="exception">output Exception value if deserialize failed</param>
/// <returns>true if this XmlSerializer can deserialize the object; otherwise, false</returns>
public static bool LoadFromFile(string fileName, System.Text.Encoding encoding, out ProvidersProvider obj, out System.Exception exception)
{
exception = null;
obj = default(ProvidersProvider);
try
{
obj = LoadFromFile(fileName, encoding);
return true;
}
catch (System.Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.StackTrace );
exception = ex;
return false;
}
}
public static bool LoadFromFile(string fileName, out ProvidersProvider obj, out System.Exception exception)
{
return LoadFromFile(fileName, Encoding.UTF8, out obj, out exception);
}
public static bool LoadFromFile(string fileName, out ProvidersProvider obj)
{
System.Exception exception = null;
return LoadFromFile(fileName, out obj, out exception);
}
public static ProvidersProvider LoadFromFile(string fileName)
{
return LoadFromFile(fileName, Encoding.UTF8);
}
public static ProvidersProvider LoadFromFile(string fileName, System.Text.Encoding encoding)
{
System.IO.FileStream file = null;
System.IO.StreamReader sr = null;
try
{
file = new System.IO.FileStream(fileName, FileMode.Open, FileAccess.Read);
sr = new System.IO.StreamReader(file, encoding);
string xmlString = sr.ReadToEnd();
sr.Close();
file.Close();
return Deserialize(xmlString);
}
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.StackTrace);
return null;
}
finally
{
if ((file != null))
{
file.Dispose();
}
if ((sr != null))
{
sr.Dispose();
}
}
}
#endregion
}
[System.CodeDom.Compiler.GeneratedCodeAttribute("System.Xml", "4.0.30319.233")]
[System.SerializableAttribute()]
[System.Xml.Serialization.XmlTypeAttribute(IncludeInSchema = false)]
public enum ItemsChoiceType
{
/// <remarks/>
domain,
/// <remarks/>
name,
/// <remarks/>
smtp,
/// <remarks/>
smtpport,
/// <remarks/>
ssl,
/// <remarks/>
sslport,
}
}
我想通过传递参数“domain”来读取XML并获取“ssl”字段 一个方法。我尝试了下面的代码，但发生了异常。这是我第一次使用 这种从xml中获取价值的方法，有人可以给出一些如何获得它的建议吗？
Dim providers As New Providers()
Dim ex As New Exception
Dim provider As ProvidersProvider = New ProvidersProvider()
provider.ItemsElementName.Add(ItemsChoiceType.domain)
provider.Items.Add("google.com")
provider.ItemsElementName.Add(ItemsChoiceType.name)
provider.Items.Add("Google")
'provider.Items(ItemsChoiceType.domain) = "google.com"
'provider.Items(ItemsChoiceType.name) = "Google"
'provider.Items(ItemsChoiceType.ssl) = "0"
'provider.Items(ItemsChoiceType.sslport) = "467"
'provider.Items(ItemsChoiceType.smtp) = "smtp.gmail.com"
'provider.Items(ItemsChoiceType.smtpport) = "123"
providers.Provider.Add(provider)
providers.SaveToFile("C:\Test.xml")
Try
If Not providers.LoadFromFile(Path.Combine(Globle.DllFolder, "Test.xml"), providers, ex) Then
MsgBox("Test.xml error" & ex.StackTrace, MsgBoxStyle.Critical, Constant.MSGBOX_TITLE)
Exit Sub
End If
Catch exp As Exception
MsgBox(exp.StackTrace())
End Try
Dim providerList As New List(Of ProvidersProvider)
For Each p As ProvidersProvider In providerList
Dim domain As String = p.Items(ItemsChoiceType.domain)
Dim mailDomain As String = Mid(Me.TextBoxMailAddress.Text, Me.TextBoxMailAddress.Text.IndexOf("@"))
If domain.Equals(mailDomain) Then
MsgBox("p.Items(ItemsChoiceType.sslport):" + p.Items(ItemsChoiceType.sslport))
End If
Next
End If
例外：
at System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(TypeModel model, String ns, ImportContext context, String dataType, XmlAttributes a, Boolean repeats, Boolean openModel, RecursionLimiter limiter)
at System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(TypeModel model, String ns, ImportContext context, String dataType, XmlAttributes a, RecursionLimiter limiter)
at System.Xml.Serialization.XmlReflectionImporter.ImportElement(TypeModel model, XmlRootAttribute root, String defaultNamespace, RecursionLimiter limiter)
at System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(Type type, XmlRootAttribute root, String defaultNamespace)
at System.Xml.Serialization.XmlSerializer..ctor(Type type, String defaultNamespace)
at System.Xml.Serialization.XmlSerializer..ctor(Type type)
答案 0 :(得分：0)
基于域获取SSL值的方法。您将域作为参数传递
public string GetSSL(string domain)
{
var doc = XDocument.Load(@"c:\tmp\test.xml");
var result = doc.Descendants("provider")
.Where(x=>x.Element("domain").Value == domain)
.Select(x=>x.Element("ssl").Value);
return result.FirstOrDefault();
}
使用示例
Console.WriteLine(GetSSL("live.com"));
修改
我刚注意到你是一个VB人，这在VB中是一样的
public Function GetSSL(domain as string) as string
Dim doc = XDocument.Load("c:\tmp\test.xml")
Dim result = from i in doc.Descendants("provider") where i.Element("domain").Value = domain
select i.Element("ssl").Value
return result.FirstOrDefault()
End Function