当前上下文中不存在名称“LinkButton4”？？

[mjtfzh]

错误提示：
当前上下文中不存在名称“LinkButton4”

行 17: protected void Page_Load(object sender, EventArgs e)
行 18: {
行 19: LinkButton4.Click += new EventHandler(DataList1_ItemCommand);//这一行是红色的
行 20: LinkButton5.Click += new EventHandler(DataList1_ItemCommand);}

.aspx部分代码

<asp:DataList ID="DataList1" runat="server" Width="275px" OnSelectedIndexChanged="DataList1_SelectedIndexChanged" DataKeyField="pro_id">
<ItemTemplate>


<table style="width: 174px">
<tr>
<td style="width: 70px"><asp:Image ID="Image3" runat="server" Width="100px" Height="100px" ImageUrl='<%# Eval("photo","pic_{0}.bmp") %>'></asp:Image>

</td>
<td style="width: 1987px">产品：<br>
单价：<br>
单位：<br>
<asp:LinkButton ID="LinkButton4" CommandName="category" runat="server" text="类别信息" /><br>
<asp:LinkButton ID="LinkButton5" CommandName="supplier" runat="server" text="供应商" />

</td>
<td><asp:LinkButton ID="LinkButton6" CommandName="select" runat="server" text='<%# Eval("pro_name") %>'/><br>
<%# Eval("price") %><br>
<%# Eval("unit") %>
</td>
</tr>





</table>

</ItemTemplate>
</asp:DataList>

.cs部分代码
protected void Page_Load(object sender, EventArgs e)
{
LinkButton4.Click += new EventHandler(DataList1_ItemCommand);
LinkButton5.Click += new EventHandler(DataList1_ItemCommand);
}

[cpp2017]

LinkButton4是DataList下的一个子控件 并不是这个类的一个控件。所以不能这样访问他。

[mjtfzh]

已解决，加分

[mjtfzh]

怎么访问LinkButton4控件啊？

将LinkButton4.Click += new EventHandler(DataList1_ItemCommand);
改成
DataList1.项模板.ItemTemplate.LinkButton4.Click += new EventHandler(DataList1_ItemCommand);

错误提示：“System.Web.UI.WebControls.DataList”并不包含“项模板”的定义

[yangyupeng521]

你需要在你的DataList的OnItemDataBound事件中，找到你的
{
LinkButton l4=(LinkButton)e.Item.FindControl("LinkButton4");
l4.Click += new EventHandler(DataList1_ItemCommand);
}

[mjtfzh]

明白，我试一下

[diablo1003]

学习

[aaajedll]

1楼和3楼的正解，随便巩固知识！

[bendan999999999]

可以设置linkButton4的CommandName，然后在ItemCommand，根据e.CommandName判断是不是linkButton4的CommandName，如果是就进行相应的操作

[mjtfzh]

单击LinkButton4和LinkButton5怎么不执行DataList1_ItemCommand和DataList1_OnItemDataBound呢？只执行page_load.

我想单击LinkButton4和LinkButton5都执行DataList1_ItemCommand
是什么样的设计思路呢？

.aspx部分代码
<asp:DataList ID="DataList1" runat="server" Width="275px" OnSelectedIndexChanged="DataList1_SelectedIndexChanged" DataKeyField="pro_id">
<ItemTemplate>


<table style="width: 174px">
<tr>
<td style="width: 70px"><asp:Image ID="Image3" runat="server" Width="100px" Height="100px" ImageUrl='<%# Eval("photo","pic_{0}.bmp") %>'></asp:Image>

</td>
<td style="width: 1987px">产品：<br>
单价：<br>
单位：<br>
<asp:LinkButton ID="LinkButton4" CommandName="category" runat="server" text="类别信息" /><br>
<asp:LinkButton ID="LinkButton5" CommandName="supplier" runat="server" text="供应商" />

</td>
<td><asp:LinkButton ID="LinkButton6" CommandName="select" runat="server" text='<%# Eval("pro_name") %>'/><br>
<%# Eval("price") %><br>
<%# Eval("unit") %>
</td>
</tr>

</table>

</ItemTemplate>
</asp:DataList>

.cs部分代码
protected void Page_Load(object sender, EventArgs e)
{

string commstr = "select pro_id,pro_name,price,unit,number,photo from 产品表";
SqlConnection conn = new SqlConnection(connstr);
SqlCommand comm = new SqlCommand(commstr, conn);
conn.Open();
SqlDataReader dr1 = comm.ExecuteReader();
DataList1.DataSource = dr1;
DataList1.DataBind();
dr1.Close();
conn.Close();


}
protected void DataList1_ItemCommand(object sender, DataListCommandEventArgs e)
{
string commstr1 = "select a.pro_id,b.provider_string,c.class_string from 产品表 as a,供应资料 as b,产品类别 as c where pro_id='" + DataList1.DataKeys[e.Item.ItemIndex];
//DataList1.DataKeys[e.Item.ItemIndex] + "' and b.provider=a.provider and a.pro_class=c.class_string";
SqlConnection conn1 = new SqlConnection(connstr);
SqlCommand comm1 = new SqlCommand(commstr1, conn1);
conn1.Open();
SqlDataReader dr2 = comm1.ExecuteReader();
if (dr2.Read() == true)
{

switch (e.CommandName)
{

case "catagory": Label6.Text = dr2["class_string"].ToString(); break;
case "supplier": Label7.Text = dr2["provider_string"].ToString(); break;
}
}
}

protected void DataList1_OnItemDataBound(object sender,DataListItemEventArgs e)
{
LinkButton LinkButton4 = (LinkButton)e.Item.FindControl("LinkButton4");
LinkButton LinkButton5 = (LinkButton)e.Item.FindControl("LinkButton5");
LinkButton4.Click += new EventHandler(DataList1_ItemCommand);
LinkButton5.Click += new EventHandler(DataList1_ItemCommand);
}