控件中国网提示：本文介绍使用C#(datagrid控件)编辑xml文件的方法。
对xml文件的记录进行删除，修改，或增加新记录。
利用了datagrid控件的sortcommand事件对xml里的记录进行排序。
email:ouyang76.263.net
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<%@page language="c#" Trace="true"%>
<%@import namespace="System.Data"%>
<%@import namespace="System.IO"%>
<script language="c#" runat="server">
string xmlfile="books2.xml",xpath;
void page_load(Object obj,EventArgs e)
{
xpath=Server.MapPath(xmlfile);
if(!Page.IsPostBack)
{
Dataload("isbn");
}
}
void Dataload(string psort)
{
DataSet ds=new DataSet();
FileStream fs=new FileStream(xpath,FileMode.Open);
ds.ReadXml(fs);
if(ds.Tables.Count==0)
{
Response.Write("xml文件内无记录!!!!");
fs.Close();
Response.End();
}
Trace.Warn("表记录数",Convert.ToString(ds.Tables[0].Rows.Count));
DataRow dr=ds.Tables[0].NewRow();//新建一行
dr["ISBN"] = " Add ISBN";
ds.Tables[0].Rows.InsertAt(dr,0);//插入到第0行位置
Trace.Warn("表数目",Convert.ToString(ds.Tables.Count));//以红字显示调试信息
//grid1.DataSource=ds.Tables[0].DefaultView;
//grid1.DataBind();
DataView dv=new DataView(ds.Tables[0]);
Trace.Warn("字串长度:"+psort,Convert.ToString(psort.Length));//排序字符串的长度
if(psort.Length>0)
dv.Sort=psort;
grid1.DataSource=dv;
grid1.DataBind();
fs.Close();
}
void grid_sort(Object obj,DataGridSortCommandEventArgs e)
{
if(grid1.EditItemIndex==-1)
Dataload(e.SortExpression);
else
Response.Write("正在编辑暂不能排序!!");
}
void grid_edit(Object obj,DataGridCommandEventArgs e)
{
grid1.EditItemIndex=(int)e.Item.ItemIndex;
show_del("hide");
Dataload("");
}
void grid_cancel(Object obj,DataGridCommandEventArgs e)
{
grid1.EditItemIndex=-1;
show_del("show");
Dataload("");
}
void grid_update(Object obj,DataGridCommandEventArgs e)
{
int numcell=e.Item.Cells.Count;//单元格数目(e.Item是当前发生事件的表格行)
int currentrow=e.Item.DataSetIndex;
//int curr2=e.Item.ItemIndex;//与上句等价,可以不带(int)
Trace.Warn("当前更新行号 = ",Convert.ToString(currentrow));
//Trace.Warn("2当前更新行号 = ",Convert.ToString(curr2));
DataSet ds=new DataSet();
ds.ReadXml(xpath);//将xml模式和数据读取到dataSet;
DataRow dr;//表示DataTable中的一行信息.
if(currentrow==0)
dr=ds.Tables[0].NewRow();
else
dr=ds.Tables[0].Rows[e.Item.DataSetIndex - 1];
string[] str={"isbn", "author", "title", "category", "comments"};
int j=-1;
for(int i=2;i<numcell;i++)//跳过1和2column
{
j=j+1;
string ctext;
ctext=((TextBox)e.Item.Cells[i].Controls[0]).Text;
dr[str[j]] = ctext;
Trace.Warn(Convert.ToString(i)+str[j]+":每一行的文本",ctext);
}
if(currentrow==0)
{
Response.Write("加入新记录!!");
ds.Tables[0].Rows.InsertAt(dr,0);
}
ds.WriteXml(xpath);//将表示dataset的xml写入到xml文件中,包括数据和模式.
grid1.EditItemIndex = -1;//无此句仍在编辑界面
show_del("show");
Dataload("");
}
void show_del(string state)
{
string tmp=state;
switch(tmp)
{
case "show":
grid1.Columns[0].Visible = true;
break;
case "hide":
grid1.Columns[0].Visible = false;
break;
default:
grid1.Columns[0].Visible = true;
break;//也要带break
}
}
void initialize(Object obj,DataGridItemEventArgs e)//注意参数与其它函数不同
{
//e.Item.Cells[0].Text="aaaaa";//
if(e.Item.ItemIndex==0)//如果是第一行
{
LinkButton a0=new LinkButton();
a0=(LinkButton)e.Item.Cells[0].Controls[0];
LinkButton a1=new LinkButton();
a1=(LinkButton)e.Item.Cells[1].Controls[0];//在grid内建一个linkbutton控件
if(a0.Text=="删 除")
a0.Text="";
if(a1.Text=="编 辑")
a1.Text="[AddNew]";
}
}
void grid_del(Object obj,DataGridCommandEventArgs e)
{
Response.Write("XX");
Trace.Warn("正要删除",Convert.ToString(e.Item.ItemIndex));//控件中的行数
int curr=e.Item.ItemIndex;
DataSet ds=new DataSet();
ds.ReadXml(xpath);
DataRow dr=ds.Tables[0].Rows[curr-1];//有一行是新加的。
dr.Delete();//找到相应的数据行，将其删除
ds.WriteXml(xpath);
grid1.EditItemIndex = -1;
Dataload("");
}
</script>
<form runat="server">
<asp:datagrid id="grid1" runat="server"
alternatingitemstyle-backcolor="#eeeeee"
headerstyle-backcolor="lightyellow"
font-size="10pt"
allowsorting="true"
onsortcommand="grid_sort"
oneditcommand="grid_edit"
oncancelcommand="grid_cancel"
onupdatecommand="grid_update"
onitemcreated="initialize"
ondeletecommand="grid_del"
bordercolor="#999999"
>
<columns>
<asp:buttoncolumn text="删 除" commandname="delete"/>
<asp:editcommandcolumn buttontype="linkbutton" updatetext="更 新" canceltext="取 消" edittext="编 辑" headertext=""/>
</columns>
</asp:datagrid>
</form>
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xml文件(文件名:books2.xml)
<?xml version="1.0" standalone="yes"?>
<books>
<book>
<isbn>2e2e2we2we2</isbn>
<author>fefdw</author>
<title>2e2eef</title>
<category>324tg</category>
<comments>r3rrgeqw21</comments>
</book>
<book>
<isbn>1234345</isbn>
<author>ssdfdfe</author>
<title>fgregre</title>
<category>r4er43trt</category>
<comments>r3r3redqeq</comments>
</book>
<book>
<isbn>1234345</isbn>
<author>ssdfdfe</author>
<title>fgregre</title>
<category>r4er43trt</category>
<comments>r3r3redqeq</comments>
</book>
<book>
<isbn>0679757651</isbn>
<author>Tom Peters</author>
<title>Circle of Innovation</title>
<category>marketing</category>
<comments>His most recent book is his best by far!</comments>
</book>
<book>
<isbn>0884270610</isbn>
<author>Eli Goldthrait</author>
<title>The Goal</title>
<category>management</category>
<comments>Advocate of Theory of Constraints as applied to managment and optimization.</comments>
</book>
<book>
<isbn>068485600X</isbn>
<author>Jeff Cox, Howard Stevens</author>
<title>Selling the Wheel</title>
<category>management</category>
<comments>Excellent Treatise/Novel on the entire Sales Cycle</comments>
</book>
<book>
<isbn>0672316498</isbn>
<author>Alan Cooper</author>
<title>The Inmates Are Running The Asylum</title>
<category>management</category>
<comments>The father of Visual Basic and creator of the new art of Interaction Design - very valuable in designing websites. Basically the worlds most cutting edge thinker in User Interface design aimed at simplifying software use.</comments>
</book>
</books>
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