xml數據

<Books>
<Books>
<BookId>102</BookId>
<BookName>C++</BookName>
<BookPrice>39</BookPrice>
<Supplier>Phei</Supplier>
</Books>
<Books>
<BookId>103</BookId>
<BookName>VB</BookName>
<BookPrice>52.2</BookPrice>
<Supplier>Pe</Supplier>
</Books>
<Books>
<BookId>105</BookId>
<BookName>Build C++</BookName>
<BookPrice>123</BookPrice>
<Supplier>ww</Supplier>
</Books>
</Books>
1﹑在C#中引用System.IO,在類中定義倆個Static DataSet ds﹐Static DataView dv。然后寫一個顯示XML数据的函数:
private void DG_Bind()
{
FileStream fs=new FileStream(Server.MapPath(".\\")+"xml\\books.xml",FileMode.Open,FileAccess.Read);
StreamReader reader=new StreamReader(fs);
ds=new DataSet();
ds.ReadXml(reader);
fs.Close();
dv=new DataView();
dv=ds.Tables[0].DefaultView;
DG.DataSource=dv;
DG.DataBind();
}
在Page_Load中引用函数:
if(!IsPostBack)
{
DG_Bind();
}

2﹑向XML中添加数据﹕
private void Add_Click(object sender, System.EventArgs e)
{
FileStream fs=new FileStream(Server.MapPath(".\\")+"xml\\books.xml",FileMode.Open,FileAccess.Read);
StreamReader reader=new StreamReader(fs);
ds=new DataSet();
ds.ReadXml(reader);
fs.Close();
DataRow dr=ds.Tables[0].NewRow();
dr["BookName"]=Book.Text.Trim();
dr["BookId"]=Bid.Text.Trim();
dr["BookPrice"]=Price.Text.Trim();
dr["Supplier"]=Supp.Text.Trim();
ds.Tables[0].Rows.Add(dr);
ds.AcceptChanges();

fs=new FileStream(Server.MapPath(".\\"）+"xml\\books.xml",FileMode.Create,FileAccess.Write|FileAccess.Read);
StreamWriter writer=new StreamWriter(fs);
ds.WriteXml(writer);
writer.Close();
fs.Close();
DG_Bind();
}

3﹑查詢數據﹐查詢數據很簡單﹐就向DV查詢就OK了﹐主要是利用DV的RowFilter方法。代碼經如下:
private void Search(object sender, System.EventArgs e)
{
dv.Sort="BookName";
dv.RowFilter="BookName like '％"+BookName.Text.Trim()+"％'";
DG1.DataSource=dv;
DG1.DataBind();
}

4﹑數據的刪除并寫入XML文件中,在這里﹐我們就要用到DG中添加的CheckBox控件的TemplateColumn作用了﹐首先利用一個循環來判斷CheckBox是否被選種﹐然后刪除選中的列﹐并寫入XML文件中。具體 的代碼如下﹕
private void Del_Click(object sender, System.EventArgs e)
{
for(int i=0;i<this.DG.Items.Count;i++)
{
CheckBox CK=(CheckBox)this.DG.Items[i].FindControl("ck");
if(CK.Checked)
{
ds.Tables[0].DefaultView.Sort="BookId";
int j=ds.Tables[0].DefaultView.Find(this.DG.Items[i].Cells[1].Text);
ds.Tables[0].DefaultView.Delete(j);
DG.DataSource=ds.Tables[0].DefaultView;
ds.AcceptChanges();
FileStream fs=new FileStream(Server.MapPath(".\\")+"xml\\books.xml",FileMode.Create,FileAccess.Write|FileAccess.Read);
StreamWriter writer=new StreamWriter(fs);
ds.WriteXml(writer);
writer.Close();
fs.Close();
}
}
DG_Bind();
}