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dim domxmldocument as system.xml.xmldocument

dim tmppath as string = apptempfilepath

dim xmlfile as string = tmppath + "＼testxml.xml"

’窗體加載事件

private sub testxml_load(byval sender as system.object, byval e as system.eventargs) handles mybase.load

’讀xml過程測(cè)試通過

dim domxmldocument as system.xml.xmldocument

dim tmppath as string = apptempfilepath

dim xmlfile as string = tmppath + "＼testxml.xml"

dim reader as system.xml.xmlreader = nothing

try

reader = new xml.xmltextreader(xmlfile)

’reader.

while reader.read

me.lboxxml.items.add(reader.name + reader.value)

end while

catch ex as exception

msgbox(ex.message)

finally

if not (reader is nothing) then

reader.close()

end if

end try

end sub

’載入xml事件

private sub btnxmlload_click(byval sender as system.object, byval e as system.eventargs) handles btnxmlload.click

’me.lboxxml.items.clear()

’’讀xml過程測(cè)試通過

’dim reader as system.xml.xmlreader = nothing

’try

’ reader = new xml.xmltextreader(xmlfile)

’ while reader.read

’ me.lboxxml.items.add(reader.name + ":" + reader.value)

’ end while

’catch ex as exception

’ msgbox(ex.message)

’finally

’ if not (reader is nothing) then

’ reader.close()

’ end if

’end try

dim ds as new dataset

try

’如果直接使用ds做datasource則不會(huì)展開datagrid，用dv則能直接顯示正確。

ds.readxml(xmlfile)

dim tb as datatable

dim dv as dataview

tb = ds.tables(0)

dv = new dataview(tb)

datagrid1.datasource = dv

’datagrid1.datamember = "testxmlmember"

’datagrid1.datamember = "employeefname"

’dim dxd as new xmldatadocument

catch ex as exception

msgbox(ex.message.tostring)

end try

end sub

’保存新建xml內(nèi)容事件

private sub btnsavenew_click(byval sender as system.object, byval e as system.eventargs) handles btnsavenew.click

dim mytw as new xmltextwriter(tmppath + "＼testxmlwrite.xml", nothing)

mytw.writestartdocument()

mytw.formatting = formatting.indented

mytw.writestartelement("team")

mytw.writestartelement("player")

mytw.writeattributestring("name", "george zip")

mytw.writeattributestring("position", "qb")

mytw.writeelementstring("nickname", "zippy")

mytw.writeelementstring("jerseynumber", xmlconvert.tostring(7))

mytw.writeendelement()

mytw.writeendelement()

mytw.writeenddocument()

mytw.close()

end sub

文件很大的情況下，可以考慮手動(dòng)實(shí)現(xiàn)數(shù)據(jù)更新適配器，比如手動(dòng)實(shí)現(xiàn)一個(gè)xml節(jié)點(diǎn)搜索/更新，這樣就不用重寫整個(gè)xml。

如果程序的i/o不是主要問題，還是用實(shí)體類整個(gè)的寫入更新吧，畢竟數(shù)據(jù)的完整性是第一位的。

如是文章類的，對(duì)該目錄建一個(gè)xml索引文件來存放文章的編號(hào)，url等，用xml的attribute作為標(biāo)記不同字段，內(nèi)容頁面可以用另外的html或xml頁面存放，用linq to xml操作數(shù)據(jù)，效率不是很差，個(gè)人觀點(diǎn)。當(dāng)搜索時(shí)候只要查詢指定文件名xml或文件類型就可以了。

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