我需要制作一个XML文件 - 而且合作伙伴对标题很贴切。显然,标题必须是这样的:
<?xml version="1.0"?>
但每当我创建一个XML文件时,我都会得到类似这样的无关属性:
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
我的黑客想要停止使用XMLWriter来制作文件,以便我可以更好地控制标题; “没问题,我只是编写一个循环,将自己的XML标记作为StreamWriter或其他东西,忘记这个XMLWriter对象......”但我必须承认,到目前为止,XMLWriter的使用相当优雅;肯定有一些东西,我可以改变XMLWriterSettings对象,说“请停止将自定义属性放入XML标题”,对吗?
这是相关的VB代码:
Dim settings As New XmlWriterSettings()
settings.Indent = True
settings.IndentChars = " "
settings.NewLineChars = "\n"
Using writer As XmlWriter = XmlWriter.Create(strFileName, settings)
writer.WriteStartDocument(True)
For Each kvp As KeyValuePair(Of String, String) In dictArguments
Dim key As String = kvp.Key
Dim value As String = kvp.Value
writer.WriteStartElement(key)
writer.WriteString(value)
writer.WriteEndElement()
Next
End Using
完美地运作;但我找不到控制标题的方法。我当然可以找到一种完全删除它的方法,但这不是我们想要做的。
编辑:感谢您的帮助;到目前为止,一旦我们删除了WriteStartDocument,它现在不再显示standalone = yes。但我不能让它停止添加编码。有什么想法吗?
答案 0 :(得分:10)
这样做的一种方法是使用WriteProcessingInstruction方法自己控制初始处理指令:
Dim settings As New XmlWriterSettings()
settings.Indent = True
settings.IndentChars = " "
Using writer As XmlWriter = XmlWriter.Create(strFileName, settings)
writer.WriteProcessingInstruction("xml", "version='1.0'")
writer.WriteStartElement("root")
For Each kvp As KeyValuePair(Of String, String) In dictArguments
Dim key As String = kvp.Key
Dim value As String = kvp.Value
writer.WriteStartElement(key)
writer.WriteString(value)
writer.WriteEndElement()
Next
writer.WriteEndElement()
End Using
请注意,我还添加了一个“root”元素,以防你的字典包含多个元素(我猜测没有字典键值是“root”):)
答案 1 :(得分:2)
我知道问题问题已经过了几个月,但是我觉得有必要提一下(长期存在的)解决方案,我偶然发现了这个问题。它确实消除了整个xmldeclaration,你需要做的就是通过写一个proccesing指令重新编写你需要的声明。
XmlFragmentWriter - Omiting the Xml Declaration and the XSD and XSI namespaces
这是VB中的类
Imports System.Xml
Imports System.IO
Imports System.Text
Class XmlFragmentWriter
Inherits XmlTextWriter
Public Sub New(ByVal w As TextWriter)
MyBase.New(w)
End Sub
Public Sub New(ByVal w As Stream, ByVal encoding As Encoding)
MyBase.New(w, encoding)
End Sub
Public Sub New(ByVal filename As String, ByVal encoding As Encoding)
MyBase.New(New FileStream(filename, FileMode.Create, FileAccess.Write, FileShare.None), encoding)
End Sub
Private _skip As Boolean = False
Public Overrides Sub WriteStartAttribute(ByVal prefix As String, ByVal localName As String, ByVal ns As String)
' STEP 1 - Omits XSD and XSI declarations.
' From Kzu - http://weblogs.asp.net/cazzu/archive/2004/01/23/62141.aspx
If prefix = "xmlns" AndAlso (localName = "xsd" OrElse localName = "xsi") Then
_skip = True
Return
End If
MyBase.WriteStartAttribute(prefix, localName, ns)
End Sub
Public Overrides Sub WriteString(ByVal text As String)
If _skip Then
Return
End If
MyBase.WriteString(text)
End Sub
Public Overrides Sub WriteEndAttribute()
If _skip Then
' Reset the flag, so we keep writing.
_skip = False
Return
End If
MyBase.WriteEndAttribute()
End Sub
Public Overrides Sub WriteStartDocument()
' STEP 2: Do nothing so we omit the xml declaration.
End Sub
End Class
以及此处的用法:
Dim f As New XmlSerializer(GetType(OFXg)) Dim w As New XmlFragmentWriter("c:\books1.xml", Nothing) w.Formatting = Formatting.Indented w.WriteProcessingInstruction("xml", "version=""1.0""") f.Serialize(w, RTofx) w.Close()
当然,OFXg类是XMLSerializable
答案 2 :(得分:1)
为什么你认为标题中有自定义属性?
WriteStartDocument使用或不使用独立属性写入标头。您的代码会添加您所说的合作伙伴不接受的属性。
您没有显示用于生成“utf-16”的代码,但我怀疑它写入了StringWriter。 .NET中的字符串总是UNICODE,当你写一个字符串时,你总是得到utf-16。如果您写入流,则可以控制编码。
答案 3 :(得分:0)
Necromancing。
您可以创建自己的XmlTextWriter并覆盖WriteStartDocument。
示例:
public class XmlTextWriterIndentedStandaloneNo : System.Xml.XmlTextWriter
{
public bool bStandAlone = false;
public bool bWriteStartDocument = true;
public bool bOmitEncodingAndStandAlone = true;
public XmlTextWriterIndentedStandaloneNo(System.IO.TextWriter w)
: base(w)
{
Formatting = System.Xml.Formatting.Indented;
} // End Constructor
public XmlTextWriterIndentedStandaloneNo(string strFileName, System.Text.Encoding teEncoding)
: base(strFileName, teEncoding)
{
Formatting = System.Xml.Formatting.Indented;
} // End Constructor
public XmlTextWriterIndentedStandaloneNo(System.IO.Stream w, System.Text.Encoding teEncoding)
: base(w, teEncoding)
{
Formatting = System.Xml.Formatting.Indented;
} // End Constructor
public override void WriteStartDocument(bool standalone)
{
if (bWriteStartDocument)
{
if (bOmitEncodingAndStandAlone)
{
this.WriteProcessingInstruction("xml", "version='1.0'");
return;
} // End if (bOmitEncodingAndStandAlone)
base.WriteStartDocument(bStandAlone);
}
} // End Sub WriteStartDocument
public override void WriteStartDocument()
{
// Suppress by ommitting WriteStartDocument
if (bWriteStartDocument)
{
if (bOmitEncodingAndStandAlone)
{
this.WriteProcessingInstruction("xml", "version='1.0'");
return;
} // End if (bOmitEncodingAndStandAlone)
base.WriteStartDocument(bStandAlone);
// False: Standalone="no"
} // End if (bWriteStartDocument)
} // End Sub WriteStartDocument
} // End Class XmlTextWriterIndentedStandaloneNo
VB.NET
Public Class XmlTextWriterIndentedStandaloneNo
Inherits System.Xml.XmlTextWriter
Public bStandAlone As Boolean = False
Public bWriteStartDocument As Boolean = True
Public bOmitEncodingAndStandAlone As Boolean = True
Public Sub New(w As System.IO.TextWriter)
MyBase.New(w)
Formatting = System.Xml.Formatting.Indented
End Sub
' End Constructor
Public Sub New(strFileName As String, teEncoding As System.Text.Encoding)
MyBase.New(strFileName, teEncoding)
Formatting = System.Xml.Formatting.Indented
End Sub
' End Constructor
Public Sub New(w As System.IO.Stream, teEncoding As System.Text.Encoding)
MyBase.New(w, teEncoding)
Formatting = System.Xml.Formatting.Indented
End Sub
' End Constructor
Public Overrides Sub WriteStartDocument(standalone As Boolean)
If bOmitEncodingAndStandAlone Then
Me.WriteProcessingInstruction("xml", "version='1.0'")
Return
End If
' End if (bOmitEncodingAndStandAlone)
If bWriteStartDocument Then
MyBase.WriteStartDocument(bStandAlone)
End If
End Sub
' End Sub WriteStartDocument
Public Overrides Sub WriteStartDocument()
If bOmitEncodingAndStandAlone Then
Me.WriteProcessingInstruction("xml", "version='1.0'")
Return
End If
' End if (bOmitEncodingAndStandAlone)
' Suppress by ommitting WriteStartDocument
If bWriteStartDocument Then
' False: Standalone="no"
MyBase.WriteStartDocument(bStandAlone)
End If
' End if (bWriteStartDocument)
End Sub
' End Sub WriteStartDocument
End Class
' End Class XmlTextWriterIndentedStandaloneNo
用法示例:
//using (System.Xml.XmlTextWriter wr = new System.Xml.XmlTextWriter(System.IO.Path.Combine(strBasePath, "TestFile.xml"), System.Text.Encoding.UTF8))
//using (System.Xml.XmlWriter wr = System.Xml.XmlWriter.Create(System.IO.Path.Combine(strBasePath, "TestFile.xml"), xwsSettings))
using (System.Xml.XmlWriter wr = new XmlTextWriterIndentedStandaloneNo(System.IO.Path.Combine(strBasePath, "TestFile.xml"), System.Text.Encoding.UTF8))
{
//wr.Formatting = System.Xml.Formatting.None; // here's the trick !
xdoc.Save(wr);
wr.Flush();
wr.Close();
} // End Using wr
答案 4 :(得分:-1)
此:
XmlWriterSettings xmlWriterSettings
= new XmlWriterSettings { OmitXmlDeclaration = true, };
会给你这个:
<?xml version="1.0"?>