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自定函数获取datagrid,datalist,rpeater控件中header,footer栏中控件

發(fā)布時(shí)間：2023/12/1 编程问答 30 豆豆

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在論壇上看到很多關(guān)于datagrid,gridview,datalist,rpeater提取header,footer中控件的問題,整理了一下.供大家分享
下面我以DataGrid為便進(jìn)行說明.
footer欄又稱頁腳欄,在很多時(shí)候我們可以在該欄放頁碼及相當(dāng)?shù)墓δ苕I.但是最后在獲得這些控件引用的時(shí)候就會(huì)有點(diǎn)麻煩,由于footer(頁腳),header(頁眉)都不在DataGrid.Items屬性中,該屬性返回的集合只包含數(shù)據(jù)綁定生成的item,所以必須用其他方法來做.下面是我從csdn和其他地方總結(jié)而來的幾種方法：
1.在ItemCreated或者ItemDataBound中對其控件進(jìn)行查找;
if?(e.Item.ItemType?==?ListItemType.Footer)
{
?
} 2.遍歷DataGrid中的所有Item.DataGrid.Controls[0]一般來說為生成的Table.
foreach?(DataGridItem?item?in?myGrid.Controls[0].Controls)
?????????{
?????????????if(item.ItemType==ListItemType.Footer)
??????????{
????????????????????????? //用Item.FindControl查找相應(yīng)的控件
??????????????????????????????}
?????????}

前面兩種方法大家都經(jīng)常用，這里再列出以前在csdn上看到的思?xì)w大哥提出的另外兩種方法。
3.Table t=(Table)DataGrid.Controls[0];
//如果你有Pager的話，那么你需要這樣編碼T.Rows[T.Rows.Count-2]去獲得Pager
DataGridItem item=(DataGridItem)t.Rows[t.Rows.Count-1];
//該item就是Footer,此時(shí)你就可以用FindControl查找了。
下面為一個(gè)完整的demo

前臺(tái)頁;

<%@?Page?Language="C#"?AutoEventWireup="true"?CodeFile="SearchHeaderAndFooterControl.aspx.cs"
????Inherits="SearchHeaderAndFooterControl"?%>

<!DOCTYPE?html?PUBLIC?"-//W3C//DTD?XHTML?1.0?Transitional//EN"?"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html?xmlns="http://www.w3.org/1999/xhtml">
<head?runat="server">
????<title>F</title>
</head>
<body>
????<form?id="form1"?runat="server">
????<div>
????????<asp:DataGrid?runat="server"?ID="gvUserView"?DataSourceID="ldsUserData"?ShowFooter="True"
????????????AllowCustomPaging="True"?AllowPaging="True"?
????????????onitemdatabound="gvUserView_ItemDataBound">
????????????<Columns>
????????????????<asp:TemplateColumn>
????????????????????<HeaderTemplate>
????????????????????????<asp:TextBox?runat="server"?ID="txtHeaderInfo"?Text="this?is?header?textbox?value!"></asp:TextBox>
????????????????????</HeaderTemplate>
????????????????</asp:TemplateColumn>
????????????????<asp:TemplateColumn>
????????????????????<FooterTemplate>
????????????????????????<asp:TextBox?runat="server"?ID="txtFooterInfo"?Text="this?is?footer?textbox?value!"></asp:TextBox>
????????????????????</FooterTemplate>
????????????????</asp:TemplateColumn>
????????????</Columns>
????????</asp:DataGrid>
????????<asp:LinqDataSource?ID="ldsUserData"?runat="server"?ContextTypeName="DataClassesDataContext"
????????????TableName="Customers">
????????</asp:LinqDataSource>
????????<br?/>
????????<asp:Button?ID="btnGetFooterControlValue"?runat="server"?Text="獲取footer控件"?OnClick="btnGetFooterControlValue_Click"?/>
????????<asp:Button?ID="btnGetHeaderControlValue"?runat="server"
????????????Text="獲取header控件"?onclick="btnGetHeaderControlValue_Click"?/>
????</div>
????</form>
</body>
</html>

后臺(tái)頁;

using?System;
using?System.Collections;
using?System.Configuration;
using?System.Data;
using?System.Linq;
using?System.Web;
using?System.Web.Security;
using?System.Web.UI;
using?System.Web.UI.HtmlControls;
using?System.Web.UI.WebControls;
using?System.Web.UI.WebControls.WebParts;
using?System.Xml.Linq;

public?partial?class?SearchHeaderAndFooterControl?:?System.Web.UI.Page
{
????protected?void?Page_Load(object?sender,?EventArgs?e)
????{

????}

????protected?void?btnGetFooterControlValue_Click(object?sender,?EventArgs?e)
????{
????????#region?方法1
????????//foreach?(DataGridItem?item?in?gvUserView.Controls[0].Controls)
????????//{

????????//????if?(item.ItemType?==?ListItemType.Footer)
????????//????{
????????//????????TextBox?txtFooter?=?item.FindControl("txtFooterInfo")?as?TextBox;
????????//????????ShowMessage(txtFooter.Text);
????????//????????break;

????????//????}
????????//}
????????#endregion

????????#region?方法2
????????//Table?clientTable?=?gvUserView.Controls[0]?as?Table;
????????//DataGridItem?item?=?(DataGridItem)clientTable.Rows[clientTable.Rows.Count?-?2];

????????//TextBox?txtFooter?=?item.FindControl("txtFooterInfo")?as?TextBox;
????????//ShowMessage(txtFooter.Text);
????????#endregion

????????

????}

????private?void?ShowMessage(string?str)
????{
????????string?notifyInfo?=?string.Format("alert('{0}');",?str);
????????Page.ClientScript.RegisterClientScriptBlock(GetType(),?"",?notifyInfo,?true);
????}

????protected?void?btnGetHeaderControlValue_Click(object?sender,?EventArgs?e)
????{
????????foreach?(DataGridItem?item?in?gvUserView.Controls[0].Controls)
????????{

????????????if?(item.ItemType?==?ListItemType.Header)
????????????{
????????????????TextBox?txtHeader?=?item.FindControl("txtHeaderInfo")?as?TextBox;
????????????????ShowMessage(txtHeader.Text);
????????????????break;
????????????}
????????}

????}

????protected?void?gvUserView_ItemDataBound(object?sender,?DataGridItemEventArgs?e)
????{
????????if?(e.Item.ItemType?==?ListItemType.Header)
????????{
????????????TextBox?txtHeader?=?e.Item.FindControl("txtHeaderInfo")?as?TextBox;
????????????ShowMessage(txtHeader.Text);

????????}
????????//if?(e.Item.ItemType?==?ListItemType.Footer)
????????//{
????????//????TextBox?txtFooter?=?e.Item.FindControl("txtFooterInfo")?as?TextBox;
????????//????ShowMessage(txtFooter.Text);

????????//}
????}
}

如果控件為GridView，則進(jìn)行簡單變換即可使用

if?(e.Row.RowType?==?DataControlRowType.Header)
????????{
????????????TextBox?txtHeader?=?e.Row.FindControl("txtHeaderInfo")?as?TextBox;
????????????ShowMessage(txtHeader.Text);

????????}
????????//if?(e.Row.RowType?==?DataControlRowType.Footer)
????????//{
????????//????TextBox?txtFooter?=?e.Item.FindControl("txtFooterInfo")?as?TextBox;
????????//????ShowMessage(txtFooter.Text);

????????//}

DataList,Repeater也是同理

?//if?(e.Item.ItemType?==?ListItemType.Header)
????????//{

????????//}
????????if?(e.Item.ItemType?==?ListItemType.Footer)
????????{
????????????TextBox?txtFooter?=?e.Item.FindControl("txtFooterInfo")?as?TextBox;
????????????//TextBox?txtFooter?=?e.Item.Controls[1]?as?TextBox;
????????????ShowMessage(txtFooter.Text);
????????}

轉(zhuǎn)載于:https://www.cnblogs.com/symbol441/archive/2007/12/04/981962.html

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