| 标题 | C#提高xml读写速度方法 |
| 内容 | dim domxmldocument as system.xml.xmldocument dim tmppath as string = apptempfilepath dim xmlfile as string = tmppath + "＼testxml.xml" ’窗体加载事件 private sub testxml_load(byval sender as system.object, byval e as system.eventargs) handles mybase.load ’读xml过程测试通过 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 ’载入xml事件 private sub btnxmlload_click(byval sender as system.object, byval e as system.eventargs) handles btnxmlload.click ’me.lboxxml.items.clear() ’’读xml过程测试通过 ’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则不会展开datagrid，用dv则能直接显示正确。 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内容事件 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 文件很大的情况下，可以考虑手动实现数据更新适配器，比如手动实现一个xml节点搜索/更新，这样就不用重写整个xml。 如果程序的i/o不是主要问题，还是用实体类整个的写入更新吧，毕竟数据的完整性是第一位的。 如是文章类的，对该目录建一个xml索引文件来存放文章的编号，url等，用xml的attribute作为标记不同字段，内容页面可以用另外的html或xml页面存放，用linq to xml操作数据，效率不是很差，个人观点。当搜索时候只要查询指定文件名xml或文件类型就可以了。 |
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