public class MyDataGrid : System.Web.UI.WebControls.DataGrid
{
public override void RendControl(HtmlTextWriter writer)
{
base.RendControl(writer);
}
}
{
public override void RendControl(HtmlTextWriter writer)
{
base.RendControl(writer);
}
}
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- a.aspx.cs能访问b.aspx.cs中的相关方法吗?
{
StringBuilder ee = new StringBuilder();
StringWriter we = new StringWriter(ee);
HtmlTextWriter hw = new HtmlTextWriter(we);
control.RenderControl(hw);
return ee.ToString();
}
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.IO" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><script runat="server">
Boolean SubControlsCreated = false; private void CreateSubControls()
{
SubControlsCreated = true;
this.PlaceHolder1.Controls.Clear();
if (UCName != null)
{
Control uc = this.LoadControl(UCName);
uc.ID = "aaa";
this.PlaceHolder1.Controls.Add(uc);
}
} private string UCName
{
get
{
return (string)ViewState["uc"];
}
set
{
if (string.IsNullOrEmpty(value)) ViewState.Remove("uc"); else ViewState["uc"] = value;
SubControlsCreated = false;
}
} protected void Button1_Click(object sender, EventArgs e)
{
UCName = this.TextBox1.Text + ".ascx";
} static private string RenderAnyControl(Control control)
{
StringBuilder ee = new StringBuilder();
StringWriter we = new StringWriter(ee);
HtmlTextWriter hw = new HtmlTextWriter(we);
control.RenderControl(hw);
return ee.ToString();
} public override void VerifyRenderingInServerForm(Control control)
{
//base.VerifyRenderingInServerForm(control);
} public override void RenderControl(HtmlTextWriter writer)
{
this.Label1.Text = Server.HtmlEncode(RenderAnyControl(this.PlaceHolder1));
base.RenderControl(writer);
} protected void Page_Load(object sender, EventArgs e)
{
if (!SubControlsCreated)
CreateSubControls();
}
protected void Page_PreRender(object sender, EventArgs e)
{
if (!SubControlsCreated)
CreateSubControls();
}</script><html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页</title>
</head>
<body style="font-size: smaller">
<form id="form1" runat="server">
请输入用户控件名字(不含后缀):<asp:TextBox ID="TextBox1" runat="server" Width="240px"></asp:TextBox><br />
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
<hr />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="装入子控件" />
<br />
html:
<asp:Label ID="Label1" runat="server"></asp:Label>
<hr />
<asp:Button ID="Button2" runat="server" Text="什么也不做,只为测试动态装入的用户控件状态保持能力" />
</form>
</body>
</html>
<%@ Import Namespace="System.Data" %><script runat="server"> private DataTable ds
{
get
{
DataTable ret = new DataTable();
ret.Columns.Add("name", typeof(string));
DataRow dr;
dr = ret.NewRow(); dr[0] = "张三"; ret.Rows.Add(dr);
dr = ret.NewRow(); dr[0] = "皇帝"; ret.Rows.Add(dr);
dr = ret.NewRow(); dr[0] = "王五"; ret.Rows.Add(dr);
dr = ret.NewRow(); dr[0] = "马超"; ret.Rows.Add(dr);
dr = ret.NewRow(); dr[0] = "关羽"; ret.Rows.Add(dr);
return ret;
}
} protected override void CreateChildControls()
{
base.CreateChildControls();
if (this.DataGrid1.Items.Count == 0)
{
this.DataGrid1.DataSource = ds;
this.DataGrid1.DataBind();
}
} protected void Button1_Click(object sender, EventArgs e)
{
string s = string.Empty;
foreach (DataGridItem item in this.DataGrid1.Items)
{
if (((CheckBox)item.FindControl("CheckBox1")).Checked)
s += "[" + item.ItemIndex.ToString() + "]";
}
this.Label1.Text = s;
}</script><asp:DataGrid ID="DataGrid1" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:BoundColumn DataField="name" HeaderText="姓名" ReadOnly="True"></asp:BoundColumn>
<asp:TemplateColumn HeaderText="选择">
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" />
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>
<asp:Button ID="Button1" runat="server" Text="看看都选择了什么?" OnClick="Button1_Click" /><asp:Label
ID="Label1" runat="server"></asp:Label>
{
base.CreateChildControls();
this.DataGrid1.DataSource = ds;
this.DataGrid1.DataBind();
}只是原来多此一举判断了Items.Count==0,这一句并不必要。