ASP.NET （C#）动态添加控键

来源：互联网发布：淘宝茶叶店铺前十编辑：程序博客网时间：2024/06/01 07:38

参考
private void Page_Load(object sender, System.EventArgs e)
{
if(Page.IsPostBack)
{
if(ViewState["IsLoadTextBox"]!=null)
{
Add();
}
}
}

private void Button1_Click(object sender, System.EventArgs e)
{
if(ViewState["IsLoadTextBox"]==null)
{
Add();
ViewState["IsLoadTextBox"]=1;

}
}

private void Add()
{
TableRow r = new TableRow();
TableCell c=new TableCell();
HtmlInputFile t=new HtmlInputFile();
t.ID="tbfile";
c.Controls.Add(t);
r.Cells.Add(c);
this.Table1.Rows.Add(r);
}
}

//====================================
//动态创建控件的最佳时机OnInit
//====================================

用例子说明怎样动态创建控件.

没有多写注释,有问题的请问.

希望对你

开发比较动态的控件有帮助.

<%@ Page Language=C# %>
<SCRIPT runat="server">

public class MyControl : Control , INamingContainer
{
Button btn1;
HyperLink link1;

LinkButton btn2;
HyperLink link2;

override protected void CreateChildControls()
{
CreateControlsByType();
}

protected void CreateControlsByType()
{
object o=ViewState["type"];
int t=o==null?1:(int)o;//默认是方案1

if(t==1)
{
btn1=new Button();
btn1.Text="切换到方案2";
btn1.Click+=new EventHandler(btn1_Click);
link1=new HyperLink();
link1.NavigateUrl="http://www.asp.net";
link1.Text="Link1";

Controls.Add(new LiteralControl("<table border=1><tr><td>"));
Controls.Add(btn1);
Controls.Add(new LiteralControl("</td><td>"));
Controls.Add(link1);
Controls.Add(new LiteralControl("</td></tr></table>"));
}
else//方案2
{
btn2=new LinkButton();
btn2.Text="切换到方案1";
btn2.Click+=new EventHandler(btn2_Click);

link2=new HyperLink();
link2=new HyperLink();
link2.NavigateUrl="http://www.microsoft.com";
link2.Text="Link2";

Controls.Add(new LiteralControl("<table border=1><tr><td>"));
Controls.Add(btn2);
Controls.Add(new LiteralControl("</td><td>"));
Controls.Add(link2);
Controls.Add(new LiteralControl("</td></tr></table>"));
}
}
void EnsureRecreateControls()
{
if(ChildControlsCreated)
{
Controls.Clear();
CreateControlsByType();
}
else
{
EnsureChildControls();
}
}

void btn1_Click(object sender,EventArgs args)
{
ViewState["type"]=2;

EnsureRecreateControls();

link2.Text="已经切换为2方案了";
}
void btn2_Click(object sender,EventArgs args)
{
ViewState["type"]=1;

EnsureRecreateControls();

link1.Text="已经切换为1方案了";
}
}

override protected void OnInit(EventArgs args)
{
holder1.Controls.Add(new MyControl());
base.OnInit(args);
}
</SCRIPT>
<html>
<head>
<title>Sample By Lostinet</title>
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</head>
<body>
<form id="SampleForm" method="post" runat="server">
<asp:PlaceHolder Runat=server ID=holder1>
</asp:PlaceHolder>
<br/>
<asp:Button Runat=server Text="在控件之外进行回发"></asp:Button>
</form>
</body>
</html>