[英]How to dynamically populate a RadioButtonList from the database within a Repeater control
這是我第一次嘗試從Repeater控件中動態填充RadioButtonList。 到目前為止進展不順利。
我正在嘗試我在這里找到的這段代碼,該代碼應該對編寫該代碼的人有用:
protected void fillRepeater_onitembound(object sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
sql = "select PurchaseTypeID,PurchaseType from PurchaseType";
object obj = null;
ds = obj.openDataset(sql);
ListItem li;
RadioButtonList rbtl = (RadioButtonList)e.Item.FindControl("radioatt");
if (rbtl != null)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
li = new ListItem();
li.Text = dt.Rows[i]["PurchaseType"].ToString();
li.Value = dt.Rows[i]["PurchaseTypeID"].ToString();
rbtl.Items.Add(li);
}
}
}
}
<asp:Repeater ID="Repeater2" runat="server" OnItemDataBound="fillRepeater_onitembound">
<ItemTemplate>
<table style="width:100%;border: 1px solid black;">
<tr>
<td style="width:50%;border-collapse: collapse;border: 1px solid black;">
Purchased:<asp:radiobuttonlist ID="rblPurchaseType" runat="server" RepeatDirection="Horizontal" TextAlign="Right" style="display:inline;"></asp:radiobuttonlist></td>
<td style="text-align:center;border: 1px solid black;">
</td>
</tr>
<tr>
</table>
...
...
...
</asp:Repeater>
但是,我遇到了錯誤:
'object'不包含'openDataset'的定義,找不到可以接受'object'類型的第一個參數的擴展方法'openDataset'(您是否缺少using指令或程序集引用?
任何想法有什么問題嗎?
更新:
public DataTable LoadDataFromDatabase(string query)
{
DataTable dt = new DataTable();
using (SqlConnection connection = new SqlConnection(connStr))
using (SqlDataAdapter adapter = new SqlDataAdapter(query, connection))
{
try
{
adapter.Fill(dt);
}
catch (Exception ex)
{
//handle error if needed
}
}
return dt;
}
string myQuery = "SELECT PurchaseTypeID, PurchaseType FROM PurchaseType ORDER BY PurchaseType";
string rbtl = Repeater2.FindControl("rblPurchaseType");
rbtl.DataSource = LoadDataFromDatabase(myQuery);
rbtl.DataTextField = "PurchaseType";
rbtl.DataValueField = "PurchaseTypeID";
rbtl.DataBind();
obj
到底是什么? 除非將其openDataset
回具有openDataset
屬性的對象,否則它將永遠無法工作。
我使用的是一種簡單的方法,該方法從查詢返回DataTable
並將其綁定到RadioButtonList
public DataTable LoadDataFromDatabase(string query)
{
DataTable dt = new DataTable();
using (SqlConnection connection = new SqlConnection(YourConnectionString))
using (SqlDataAdapter adapter = new SqlDataAdapter(query, connection))
{
try
{
adapter.Fill(dt);
}
catch (Exception ex)
{
//handle error if needed
}
}
return dt;
}
現在,您可以使用此方法快速簡單地從數據庫中獲取所需的內容,並將其綁定到所需的任何Control。
string myQuery = "SELECT PurchaseTypeID, PurchaseType FROM PurchaseType ORDER BY PurchaseType";
rbtl.DataSource = LoadDataFromDatabase(myQuery);
rbtl.DataTextField = "PurchaseType";
rbtl.DataValueField = "PurchaseTypeID";
rbtl.DataBind();
PS rbtl
在您的情況下始終為null
,因為aspx中RadioButton的ID為rblPurchaseType
並且您在radioatt
上使用FindControl,請確保它們相同。
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