循环中继器项目

我有一个转发器，其构建如下：

  
 
 
 
 
 
 
 
 
 
  
 How Many?
  
  
 
 
 
 
 
   

它受到约束：

  ListProducts = db.GetDataTable("select * from Products where Id in (" + selectedValues + ")"); rptItems.DataSource = ListProducts; rptItems.DataBind(); 

然后额外的东西完成：

 protected void rptItems_ItemDataBound(object sender, System.Web.UI.WebControls.RepeaterItemEventArgs e) { DataRowView nRow = null; switch (e.Item.ItemType) { case ListItemType.Item: case ListItemType.AlternatingItem: nRow = (DataRowView)e.Item.DataItem; ((Literal)e.Item.FindControl("ltrDescription")).Text = "" + nRow["Description"]; ((Literal)e.Item.FindControl("ltrName")).Text = "" + nRow["Name"]; if ("" + nRow["HasAmount"] == "False") { ((Panel)e.Item.FindControl("pnlAmount")).Visible = false; } break; } } 

但是，现在在页面的onclick事件中，我正在尝试保存存储的信息 – 这是我到目前为止所做的，但它总是似乎都是null，我不能添加.text等到(TextBox)item.FindControl("tbSelected");

inheritance我的循环我正在尝试点击：

 protected void doStageThree(object sender, EventArgs e) { foreach (RepeaterItem item in rptItems.Items) { if (item.ItemType == ListItemType.Item || item.ItemType == ListItemType.AlternatingItem) { var tbSelected = (TextBox)item.FindControl("tbSelected"); var lblDescription = (Literal)item.FindControl("ltrDescription"); var lblName = (Literal)item.FindControl("ltrName"); } } } 

Answer 1

它始终为null，因为没有具有id tbSelected TextBox

将其更改为：

 var tbSelected = (TextBox)item.FindControl("tbox"); 

要保护您的代码不使用null，请使用关键字：

 var tbSelected = item.FindControl("tbox") as TextBox; if (tbSelected != null) { //textbox with id tbox exists tbSelected.Text = "your text"; } 

Answer 2

尝试更换

  foreach (RepeaterItem item in rptItems.Items) 

同

  foreach (Control c in rptItems.Items) { if(c.FindControl("tbSelected") != null) { var selectedText = ((TextBox)c.FindControl("tbSelected")).Text; } }