C# repeater：从数据库检索列标题

客户：

我使用中继器从数据库中检索数据

我的问题是：如何从数据库中检索列标题，而不仅仅是数据本身？

---

标题不是作为中继器的项进行数据绑定的（有关详细信息，请参阅此项及其答案）。但是您可以在中继器的itemscreated事件中调整标题。首先，您需要在标题中放置一些文本控件，并为ItemCreated事件添加一个处理程序：

   try
   {
       using (var conn = new SqlConnection(_connectionString))
       {
           using (var cmd = new SqlCommand("spFilterByContinent", conn))
           {
               using (var adapter = new SqlDataAdapter(cmd))
               {
                   cmd.CommandType = CommandType.StoredProcedure;
                   adapter.Fill(table);
               }
           }
       }
       Repeater1.DataSource = table;
       Repeater1.DataBind();
   }
   catch (Exception exception)
   {
       //TODO: write excepetion 
   }
}

public void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Header)
    {
        string header1 = string.Empty;
        string header2 = string.Empty;
        string header3 = string.Empty;
        string header4 = string.Empty;
        // Retrieve headers from database and assign to variables
        SetHeaderValue(e.Item, "litHeader1", header1);
        SetHeaderValue(e.Item, "litHeader2", header2);
        SetHeaderValue(e.Item, "litHeader3", header3);
        SetHeaderValue(e.Item, "litHeader4", header4);
    }
}

private void SetHeaderValue(RepeaterItem item, string litId, string headerText)
{
    var lit = item.FindControl(litId) as Literal;
    if (lit != null)
        lit.Text = headerText;
}
}

---

你使用VB.NET还是C？没关系，C#@user2487126-没关系。不起作用，可能是因为中继器还没有数据源？我将在您添加的问题中添加服务器代码。@user2487126:是的，当中继器绑定到数据时，会引发ItemDataBound。因此，您需要设置中继器的

数据源

并调用

DataBind（）

。谢谢，您能告诉我将这些数据源和绑定命令放在哪里吗？@user2487126:在您的代码示例中，您已经设置了

数据源

并调用

DataBind（）

。但是在标记中，缺少

ItemDataBound

事件的注册（

OnItemDataBound=“Repeater1\u ItemDataBound”

）。请验证这一点，并在调试器中检查是否调用了事件处理程序。@user2487126:您不必这样做。为避免误解：首先加载表，分配

DataSource

并调用

DataBind（）

。您的服务器代码看起来正确，但缺少aspx中事件处理程序的注册：

   try
   {
       using (var conn = new SqlConnection(_connectionString))
       {
           using (var cmd = new SqlCommand("spFilterByContinent", conn))
           {
               using (var adapter = new SqlDataAdapter(cmd))
               {
                   cmd.CommandType = CommandType.StoredProcedure;
                   adapter.Fill(table);
               }
           }
       }
       Repeater1.DataSource = table;
       Repeater1.DataBind();
   }
   catch (Exception exception)
   {
       //TODO: write excepetion 
   }
}

public void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Header)
    {
        string header1 = string.Empty;
        string header2 = string.Empty;
        string header3 = string.Empty;
        string header4 = string.Empty;
        // Retrieve headers from database and assign to variables
        SetHeaderValue(e.Item, "litHeader1", header1);
        SetHeaderValue(e.Item, "litHeader2", header2);
        SetHeaderValue(e.Item, "litHeader3", header3);
        SetHeaderValue(e.Item, "litHeader4", header4);
    }
}

private void SetHeaderValue(RepeaterItem item, string litId, string headerText)
{
    var lit = item.FindControl(litId) as Literal;
    if (lit != null)
        lit.Text = headerText;
}
}

<asp:Repeater ID="Repeater1" runat="server" OnItemCreated="Repeater1_ItemCreated">
    <HeaderTemplate>
        <table id="Table_car">
            <tr>
                <th><asp:Literal ID="litHeader1" runat="server" /></th>
                <th><asp:Literal ID="litHeader2" runat="server" /></th>
                <th><asp:Literal ID="litHeader3" runat="server" /></th>
                <th><asp:Literal ID="litHeader4" runat="server" /></th>
            </tr>
        </HeaderTemplate>
    </HeaderTemplate>
    <!-- ... -->
</asp:Repeater>

protected void Repeater1_ItemCreated(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Header)
    {
         var tbl = (DataTable)((Repeater)sender).DataSource;
         SetHeaderValue(e.Item, "litHeader1", tbl, 0);
         SetHeaderValue(e.Item, "litHeader2", tbl, 1);
         SetHeaderValue(e.Item, "litHeader3", tbl, 2);
         SetHeaderValue(e.Item, "litHeader4", tbl, 3);
    }
}

private void SetHeaderValue(RepeaterItem item, string litId, DataTable tbl, int colIndex)
{
    var lit = item.FindControl(litId) as Literal;
    if (lit != null)
    {
        string headerText = 
            tbl.Columns.Count > colIndex ? tbl.Columns[colIndex].ColumnName : "Not set";
        lit.Text = headerText;
    }
}