[C#自学第二天]XML 与DataSet互转数据

1. DataSet To XML:

如何把数据导出来变成XML? 这种问题经常遇到，vs提供了dataset做为数据库里面数据的容器，并且为这个容器添加了一系列游泳的属性: WriteXml就是这个功能的主要方法:

protected void Button6_Click(object sender, EventArgs e)
{
System.Data.DataTable excelTable = new System.Data.DataTable();

SqlConnection sqlconn = new SqlConnection("Data Source=efacsdb;Initial Catalog=whatifdb;User ID=sa; Password=L-BBgD7q");
sqlconn.Open();
SqlDataAdapter sda = new SqlDataAdapter("select top 10 * from temp_upload_mapping", sqlconn);
DataSet ds = new DataSet();
sda.Fill(ds, "table1");
excelTable = ds.Tables["table1"];

//使用WriteXml很容易就产生了一个xml:
ds.WriteXml(@"c:\temp\buyer_group.xml");
sqlconn.Close();

}

出来的结果如下: (table1即为dataset的datatable, Newdataset即为dataset的名字;)

<?xml version="1.0" standalone="yes"?>
<NewDataSet>
<table1>
<rowid>4</rowid>
<colname>suppliername</colname>
<tablename>t_tt_sourcing_generate_sup_basic</tablename>
<itemname>Company Name</itemname>
</table1>
<table1>
<rowid>6</rowid>
<colname>mgr_contactor</colname>
<tablename>t_tt_sourcing_contact_detail</tablename>
<itemname>Contact Person</itemname>
</table1>
</NewDataSet>

2. XML to DATASET:

得到的XML文件以后，只要文件满足一定的格式要求，就可以通过ReadXml直接独到Dataset里面 ；

protected void Button7_Click(object sender, EventArgs e)
{
string fromPath = @"c:\temp\buyer_group.xml";
FileInfo xmlFile = new FileInfo(fromPath);
DataSet dsXML = null;

if (xmlFile.Exists)
{
FileStream fsReadxml = new FileStream(fromPath,FileMode.Open);
XmlTextReader myXmlReader = new XmlTextReader(fsReadxml);
dsXML = new DataSet();

dsXML.ReadXml(myXmlReader);

DataView dv = new DataView(dsXML.Tables[0]);
dv.RowFilter = " tablename='t_tt_sourcing_contact_detail'";
gvXML.DataSource = dv;
gvXML.DataBind();

myXmlReader.Close();
}
}

测试过程table ddl:

drop table temp_upload_mapping
create table temp_upload_mapping (rowid int,colname varchar(60),tablename varchar(60),itemname varchar(100))
insert into temp_upload_mapping values (

insert into temp_upload_mapping (itemname,rowid,colname,tablename) values ('Company Name',4,'suppliername','t_tt_sourcing_generate_sup_basic')
insert into temp_upload_mapping (itemname,rowid,colname,tablename) values ('Contact Person',6,'mgr_contactor','t_tt_sourcing_contact_detail')
insert into temp_upload_mapping (itemname,rowid,colname,tablename) values ('Contact Person Title',7,'mgr_title','t_tt_sourcing_contact_detail')
insert into temp_upload_mapping (itemname,rowid,colname,tablename) values ('email',8,'mgr_email','t_tt_sourcing_contact_detail')
insert into temp_upload_mapping (itemname,rowid,colname,tablename) values ('Tel',9,'mgr_telephone','t_tt_sourcing_contact_detail')
insert into temp_upload_mapping (itemname,rowid,colname,tablename) values ('Fax',10,'mgr_fax','t_tt_sourcing_contact_detail')
insert into temp_upload_mapping (itemname,rowid,colname,tablename) values ('Address',11,'mgr_address','t_tt_sourcing_contact_detail'insert into temp_upload_mapping (itemname,rowid,colname,tablename) values ('Province/State',12,'mgr_province','t_tt_sourcing_contact_detail')