在GridView中使用FindControl
最近项目中用到FindControl和GridView，整理了一下几种使用方法，留作资料。
1、在选择（SelectedIndexChanged）事件中使用
//获得被选择行的TextBox1
protected void gv1_SelectedIndexChanged(object sender, EventArgs e)
{
//Control c = this.gv1.Rows[this.gv1.SelectedIndex].FindControl("TextBox1");
//TextBox tb = (TextBox)c;
//tb.Text = "TextBox";
TextBox tb = (TextBox)this.gv1.Rows[this.gv1.SelectedIndex].FindControl("TextBox1");
tb.Text = "hello";
}
2、在编辑行（RowEditing）事件中使用
//编辑行时，找到TextBox1
protected void gv1_RowEditing(object sender, GridViewEditEventArgs e)
{
//设置要编辑行的索引
gv1.EditIndex = e.NewEditIndex;
GridViewBind();
TextBox tb = (TextBox)this.gv1.Rows[e.NewEditIndex].FindControl("TextBox1");
Response.Write(tb.Text);
}
3、在取消编辑行（RowCancelingEdit）事件中使用
//取消编辑时，找到TextBox1
protected void gv1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
TextBox tb = (TextBox)this.gv1.Rows[e.RowIndex].FindControl("TextBox1");
Response.Write(tb.Text);
gv1.EditIndex = -1;
GridViewBind();
}
4、在行绑定（RowDataBound）事件中使用
//获得行数据绑定中的TextBox1
protected void gv1_RowDataBound(object sender, GridViewRowEventArgs e)
{
// 对于在RowDataBound中Find,可以用if (e.Row.RowType == DataControlRowType.DataRow)来限制Find的范围,因为Find默认是在HeaderTemplate中找,如果不限定范围,在HeaderTemplate中找不到,自然就返回null,然后就出错了,DataControlRowType枚举中的DataRow确定是数据行.
//if (e.Row.RowType == DataControlRowType.DataRow)
//{
// TextBox tb = (TextBox)e.Row.FindControl("TextBox1");
// tb.Text = "databind";
//}
//如果在DataGrid的页眉和页脚：
//if (e.Row.RowType == DataControlRowType.Header)
//{
// TextBox tbheader = (TextBox)e.Row.FindControl("txtHeader");
// tbheader.Text = "Head";
//}
((TextBox)this.gv1.Controls[0].Controls[0].FindControl("txtHeader")).Text = "Head";
if (e.Row.RowType == DataControlRowType.Footer)
{
TextBox tbfooter = (TextBox)e.Row.FindControl("txtFooter");
tbfooter.Text = "Footer";
}
}
5、在行命令（RowCommand）事件中使用
//行命令时间中找到TextBox1
//如果使用GridView默认的模式,e.CommandArgument自动棒定为该行的Index,这时候只要指定gridview1.Rows[Convert.ToInt32(e.CommandArgument)].FindControl("xxx")就可以了,但是如果转化为Template,e.CommandArgument并不会自动绑定任何值,需要手动绑定,可以在<ItemTemplate></ItemTemplate>手动写CommandArgument="<%# ((GridViewRow) Container).RowIndex %>",把这个行的 Index绑定绑定到该e.CommandArgument就可以了.
protected void gv1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName.ToLower() == "change")
{
TextBox tb = (TextBox)this.gv1.Rows[Convert.ToInt32(e.CommandArgument)].FindControl("TextBox1");
Response.Write(tb.Text);
}
}
其他事件中的使用，和上面列举的类似
附上，前台代码:UseTest3.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="UseTest3.aspx.cs" Inherits="UseTest3" %>
<!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>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="gv1" runat="server" AutoGenerateColumns="False" OnSelectedIndexChanged="gv1_SelectedIndexChanged" OnRowEditing="gv1_RowEditing" OnRowDataBound="gv1_RowDataBound" ShowFooter="True" OnRowCommand="gv1_RowCommand" DataKeyNames="employeeid" OnRowCancelingEdit="gv1_RowCancelingEdit">
<Columns>
<asp:TemplateField>
<HeaderTemplate>
<asp:TextBox ID="txtHeader" runat="Server"></asp:TextBox>
</HeaderTemplate>
<ItemTemplate>
<asp:TextBox ID="TextBox1" Text='<%# Bind("employeeid")%>' runat="server"></asp:TextBox>
</ItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtFooter" runat="server"></asp:TextBox>
</FooterTemplate>
</asp:TemplateField>
<asp:BoundField DataField="lastname" HeaderText="LastName" />
<asp:BoundField DataField="firstname" HeaderText="FirstName" />
<asp:ButtonField CommandName="select" Text="选择" />
<asp:ButtonField CommandName="change" Text="change" />
<asp:CommandField ShowEditButton="True" />
</Columns>
</asp:GridView>
</div>
</form>
</body>
</html>