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以前在asp很难实现代码重用,asp.net很好的解决了这个问题,以下是我写的datagrid,继承datagrid,加进了升降序/全并单元格/自动求和功能,原理很简单,但很好的实现的代码重用.
using system;
using system.web.ui;
using system.web.ui.webcontrols;
using system.componentmodel;
using system.data;
using system.data.sqlclient;
namespace sunservice
{
///
/// summary description for datagrid.
///
[defaultproperty(“text”),
toolboxdata(“<{0}:datagrid runat=”server”>”)]
public class datagrid : system.web.ui.webcontrols.datagrid
{
private string text;
private sqldataadapter adp;
private dataset ds;
private dataview view;
private string[] arritem;
[bindable(true),
category(“appearance”),
defaultvalue(“”)]
public string text
{
get
{
return text;
}
set
{
text = value;
}
}
///
/// protect sortdirection 排序方向
///
public string sortdirection
{
get
{
if(viewstate[“sortdirection”]==null)
{
return null;
}
else
{
if(viewstate[“sortdirection”].tostring()==””)
{
return null;
}
else
{
return viewstate[“sortdirection”].tostring();
}
}
}
set
{
viewstate[“sortdirection”]=value;
}
}
///
/// protect sortfield 排序字段
///
public string sortfield
{
get
{
if(viewstate[“sortfield”]==null)
{
return null;
}
else
{
if(viewstate[“sortfield”].tostring()==””)
{
return null;
}
else
{
return viewstate[“sortfield”].tostring();
}
}
}
set
{
viewstate[“sortfield”]=value;
}
}
///
/// sql 查询字串
///
public string selectcommandtext
{
get
{
if(viewstate[“selectcommandtext”]==null)
{
return null;
}
else
{
if(viewstate[“selectcommandtext”].tostring()==””)
{
return null;
}
else
{
return viewstate[“selectcommandtext”].tostring();
}
}
}
set
{
viewstate[“selectcommandtext”]=value;
}
}
///
/// 连接字串
///
public string selectconnectionstring
{
get
{
if(viewstate[“selectconnectionstring”]==null)
{
return null;
}
else
{
return viewstate[“selectconnectionstring”].tostring();
}
}
set
{
viewstate[“selectconnectionstring”]=value;
}
}
public datatable bindtable;
public datagrid()
{
this.init+=new system.eventhandler(this.datagrid_init);
}
private void datagrid_init(object sender,eventargs e)
{
this.load+= new system.eventhandler(this.datagrid_load);
this.sortcommand+=new system.web.ui.webcontrols.datagridsortcommandeventhandler(this.datagrid_sortcommand);
this.itemdatabound += new system.web.ui.webcontrols.datagriditemeventhandler(this.datagrid_itemdatabound);
}
private void datagrid_load(object sender,eventargs e)
{
this.horizontalalign=horizontalalign.center;
this.allowsorting=true;
arritem=new string[256];
ds=new dataset();
}
///
/// grid绑定
///
/// 查询字串
/// 连接字串
public void bindgrid(string selectcommandtext,string selectconnectionstring)
{
this.selectcommandtext=selectcommandtext;
this.selectconnectionstring=selectconnectionstring;
bindgrid();
}
///
/// grid绑定
///
/// 查询字串
/// 连接对象
public void bindgrid(string selectcommandtext,sqlconnection cn)
{
this.selectcommandtext=selectcommandtext;
this.selectconnectionstring=cn.connectionstring;
bindgrid();
}
///
/// grid绑定,必须先设置 selectcommmandtext 及selectconnectionstring 属性
///
public void bindgrid()
{
if(this.selectcommandtext!=null&&this.selectconnectionstring!=null)
{
adp=new sqldataadapter(this.selectcommandtext,this.selectconnectionstring);
adp.fill(ds,”temp”);
view=ds.tables[“temp”].defaultview;
if(this.sortfield!=null)
{
view.sort=this.sortfield+” “+this.sortdirection;
int sortfieldindex=0;
for( int i=0;i {
if(ds.tables[“temp”].columns[i].columnname==this.sortfield)
{
sortfieldindex=i;
break;
}
}
string sortdirectionimg=”▲”;
if(this.sortdirection==” desc”)
{
sortdirectionimg=”▼”;
}
if(this.sortfield!=this.datakeyfield)
{
ds.tables[“temp”].columns[sortfieldindex].columnname+=sortdirectionimg;
}
}
bindtable=ds.tables[“temp”];
datarow row=bindtable.newrow();
row[0]=”总计:”;
for(int i=1;i {
type t=bindtable.columns[i].datatype;
if(t==typeof(decimal)||t==typeof(double)||t==typeof(int16)||t==typeof(int32)||t==typeof(int64)||t==typeof(uint16)||t==typeof(uint32)||t==typeof(int64))
{
row[i]=0;
foreach( datarow r in bindtable.rows)
{
try
{
row[i]=double.parse(row[i].tostring())+double.parse(r[i].tostring());
}
catch(exception et)
{
}
}
}
}
bindtable.rows.add(row);
this.datasource=view;
this.databind();
}
else
{
}
}
private void datagrid_sortcommand(object source, system.web.ui.webcontrols.datagridsortcommandeventargs e)
{
if( this.sortdirection==” desc”)
{
this.sortdirection=” asc”;
}
else
{
this.sortdirection=” desc”;
}
this.sortfield=e.sortexpression;
this.sortfield=this.sortfield.replace(“▲”,””);
this.sortfield=this.sortfield.replace(“▼”,””);
bindgrid();
}
private void datagrid_itemdatabound(object sender, system.web.ui.webcontrols.datagriditemeventargs e)
{
try
{
string txt=””;
for(int i=0;i {
// e.item.cells[i].wrap=false;
txt=e.item.cells[i].text.trim();
if(myclass.isdouble(txt))
{
e.item.cells[i].horizontalalign=horizontalalign.right;
}
else
{
if(txt==arritem[i]&&txt!=””&&txt!=null)
{
e.item.cells[i].text=””;
}
else
{
arritem[i]=txt;
}
}
}
}
catch(exception et)
{
}
}
}
}
调用简单:
把组件拖到页面中 ,假设id为 datagrid1:
调用:datagrid1.bindgrid(string selectcommandtext,string selectconnectionstring)
这样省了建 conntion dataadapter dataset再绑定的时间.
大家还可把显示时间显示格式/数字显示格式等加进itemdatabound事件中,还有自定义分页功能等.
