vb.net操作xml数据库(急)

使用System.XML

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Imports Microsoft.VisualBasic

Imports System

Imports System.IO

Imports System.Xml

namespace HowTo.Samples.XML

public class WriteXmlFileSample

private const document as string = "newbooks.xml"

shared sub Main()

Dim myWriteXmlFileSample as WriteXmlFileSample

myWriteXmlFileSample = new WriteXmlFileSample()

myWriteXmlFileSample.Run(document)

end sub

public sub Run(args As String)

Dim myXmlTextReader as XmlTextReader = nothing

Dim myXmlTextWriter as XmlTextWriter = nothing

try

myXmlTextWriter = new XmlTextWriter (args, nothing)

myXmlTextWriter.Formatting = System.Xml.Formatting.Indented

myXmlTextWriter.WriteStartDocument(false)

myXmlTextWriter.WriteDocType("bookstore", nothing, "books.dtd", nothing)

myXmlTextWriter.WriteComment("此文件表示书店库存数据库的另一个片断")

myXmlTextWriter.WriteStartElement("bookstore")

myXmlTextWriter.WriteStartElement("book", nothing)

myXmlTextWriter.WriteAttributeString("genre","autobiography")

myXmlTextWriter.WriteAttributeString("publicationdate","1979")

myXmlTextWriter.WriteAttributeString("ISBN","0-7356-0562-9")

myXmlTextWriter.WriteElementString("title", nothing, "The Autobiography of Mark Twain")

myXmlTextWriter.WriteStartElement("Author", nothing)

myXmlTextWriter.WriteElementString("first-name", "Mark")

myXmlTextWriter.WriteElementString("last-name", "Twain")

myXmlTextWriter.WriteEndElement()

myXmlTextWriter.WriteElementString("price", "7.99")

myXmlTextWriter.WriteEndElement()

myXmlTextWriter.WriteEndElement()

'向文件写 XML 并关闭编写器

myXmlTextWriter.Flush()

myXmlTextWriter.Close()

' 读取返回的文件并进行分析以确保正确生成 XML

myXmlTextReader = new XmlTextReader (args)

FormatXml (myXmlTextReader, args)

catch e as Exception

Console.WriteLine ("异常：{0}", e.ToString())

finally

Console.WriteLine()

Console.WriteLine("对文件 {0} 的处理已完成。", args)

If Not myXmlTextReader Is Nothing

myXmlTextReader.Close()

end if

'关闭编写器

If Not myXmlTextWriter Is Nothing

myXmlTextWriter.Close()

end if

End try

End Sub

private shared Sub FormatXml (reader as XmlTextReader, filename as String)

Dim piCount, docCount, commentCount, elementCount as Integer

Dim attributeCount, textCount, whitespaceCount as Integer

While reader.Read()

Select (reader.NodeType)

case XmlNodeType.ProcessingInstruction:

Format (reader, "ProcessingInstruction")

piCount += 1

case XmlNodeType.DocumentType:

Format (reader, "DocumentType")

docCount += 1

case XmlNodeType.Comment:

Format (reader, "Comment")

commentCount += 1

case XmlNodeType.Element:

Format (reader, "Element")

elementCount += 1

While reader.MoveToNextAttribute()

Format (reader, "Attribute")

end While

if (reader.HasAttributes)

attributeCount += reader.AttributeCount

end if

case XmlNodeType.Text:

Format (reader, "Text")

textCount += 1

case XmlNodeType.Whitespace:

whitespaceCount += 1

End Select

End While

' 显示该文件的统计信息

Console.WriteLine ()

Console.WriteLine("{0} 文件的统计信息", filename)

Console.WriteLine ()

Console.WriteLine("处理指令：" piCount)

Console.WriteLine("文档类型：" docCount)

Console.WriteLine("注释：" commentCount)

Console.WriteLine("元素：" elementCount)

Console.WriteLine("属性：" attributeCount)

Console.WriteLine("文本：" textCount)

Console.WriteLine("空白：" whitespaceCount)

End Sub

private shared Sub Format(byref reader as XmlTextReader , NodeType as String)

' 格式化输出

Console.Write(reader.Depth " ")

Console.Write(reader.AttributeCount " ")

Dim i as Integer

for i = 0 to reader.Depth - 1

Console.Write(Strings.chr(9))

Next

Console.Write(reader.Prefix NodeType "" reader.Name "" reader.Value)

Console.WriteLine()

End Sub

End Class

End Namespace

参考:

VB6.0中如何往一个XML文件中写入数据， 当条件满足时我只是写入1或0

从VB吧里搜索来的。你看看

DOMDocument 类

文档对象模型(DOM)使用了一系列相应的对象描述了XML文档的等级状态，DOMDocument类是一个描绘XML文档的DOM结构的MSXML类。

DOMDocument类，Load方法载入一个xml文件，loadxml方法将字符串作为xml数据添加到对象中。例如，下面的代码就将一个小的xml文件添加到名为xml_document的文档中。

Dim xml_document As New DOMDocument

'写入数据

xml_document.loadXML _

"＜Person＞" vbCrLf _

" ＜FirstName＞Rod＜/FirstName＞" vbCrLf _

" ＜LastName＞Stephens＜/LastName＞" vbCrLf _

"＜/Person＞"

加载XML

Set xml_document = New DOMDocument

xml_document.Load m_AppPath "Values.xml"

vb.net中怎么创建xml文件并写数据

DataSet 和 DataTable都有现成的方法：WriteXml

DataTable tb = this.dataGridView1.DataSource as DataTable;

if(tb != null)

{

tb.WriteXml(@"C:\table.xml",true);

return;

}

DataView dv = this.dataGridView1.DataSource as DataView;

if(dv != null)

{

dv.Table.WriteXml(@"C:\table.xml",true);

return;

}

IList list = this.dataGridView1.DataSource as IList;

if(list != null)

{

//to do,如果是IList,就要你自己想办法导出了

//XmlDocument or XmlWriter都可以考虑

}

vb.net XML文件如何写入

Imports System.IO

Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim f As New FileInfo("d:\doc.xml")

If f.Exists = False Then

f.Create()

f.Refresh()

End If

Dim s As String = ""

Dim sw As StreamWriter = f.CreateText()

s = "?xml version=""1.0"" encoding=""GB2312""?"

sw.WriteLine(s)

sw.WriteLine("doc")

sw.WriteLine(" assembly")

sw.WriteLine("userId34/userId")

sw.WriteLine("userName张三/userName")

sw.WriteLine("qxbz1/qxbz")

sw.WriteLine(" /assembly")

sw.WriteLine("/doc")

sw.Flush()

sw.Close()

Process.Start("d:\doc.xml")

End Sub

End Class

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