[网络收集]在GridView、Datalist中使用FindControl

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>
        &nbsp;</div>
    </form>
</body>
</html>

参考资料

qdzx2008的专栏

在GridView中使用FindControl
http://blog.csdn.net/qdzx2008/archive/2009/09/16/4558388.aspx

应用范例:

aspx

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="id"
        DataSourceID="SqlDataSource1" OnRowDataBound="GridView_OnRowDataBound">
  <Columns>
    <asp:TemplateField HeaderText="标题">
      <ItemTemplate>
      <asp:HiddenField ID="HiddenField_id" runat="server" Value='<%# Eval("id") %>' />
      <asp:Repeater ID="Repeater2" runat="server" DataSourceID="SqlDataSource2">
        <ItemTemplate>
          <%# Eval("title") %>
        </ItemTemplate>
      </asp:Repeater>
      <!-- 关联对应的一条数据,数据源应放在这里 -->
      <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:database_ConnectionString %>"
                                SelectCommand="SELECT * FROM [db] WHERE ([id] = @id)">
        <SelectParameters>
          <asp:QueryStringParameter Name="id" QueryStringField="id" Type="Int32" />
        </SelectParameters>
      </asp:SqlDataSource>
    </ItemTemplate>
  </asp:TemplateField>
  </Columns>
</asp:GridView>

aspx.cs

using System;
using System.Web.UI.WebControls;

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

    protected void GridView_OnRowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            SqlDataSource SqlDataSource2= (SqlDataSource)e.Row.FindControl("SqlDataSource2");
            HiddenField HiddenField_id = (HiddenField)e.Row.FindControl("HiddenField_id");
            SqlDataSource2.SelectParameters["id"].DefaultValue = HiddenField_id.Value;
        }
    }

}

或者

protected void DataList_OnItemDataBound(object sender, DataListItemEventArgs e)
    {
        if (e.Item.ItemType == ListItemType.Item)
        {
            SqlDataSource SqlDataSource3 = (SqlDataSource)e.Item.FindControl("SqlDataSource3");
            HiddenField HiddenField3 = (HiddenField)e.Item.FindControl("HiddenField3");
            SqlDataSource3.SelectParameters["id"].DefaultValue = HiddenField3.Value;
        }
    }

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