我有一个基于下拉列表框的值动态创建的GridView。我使用ITemplate接口来生成字段：
public class CreateItemTemplateOrder : ITemplate
{
ImageButton imgbtn_up;
ImageButton imgbtn_down;
string s_imgbtn_up_name;
string s_imgbtn_up_ImageUrl;
string s_imgbtn_up_CommandName;
string s_imgbtn_up_CommandArgument;
public CreateItemTemplateOrder(string imgbtn_up_name, string imgbtn_up_ImageUrl, string imgbtn_up_CommandName, string imgbtn_up_CommandArgument)
{
this.s_imgbtn_up_name = imgbtn_up_name;
this.s_imgbtn_up_ImageUrl = imgbtn_up_ImageUrl;
this.s_imgbtn_up_CommandName = imgbtn_up_CommandName;
this.s_imgbtn_up_CommandArgument = imgbtn_up_CommandArgument;
}
public void InstantiateIn(Control objContainer)
{
imgbtn_up = new ImageButton();
imgbtn_up.DataBinding += new EventHandler(imgbtn_up_DataBinding);
objContainer.Controls.Add(imgbtn_up);
}
private void imgbtn_up_DataBinding(object sender, EventArgs e)
{
ImageButton imgbtn_up = (ImageButton)sender;
imgbtn_up.ID = s_imgbtn_up_name;
imgbtn_up.ImageUrl = s_imgbtn_up_ImageUrl;
imgbtn_up.CommandName = s_imgbtn_up_CommandName;
imgbtn_up.CommandArgument = s_imgbtn_up_CommandArgument;
imgbtn_up.CausesValidation = false;
}
}
现在我想从这个动态生成的列中用命令参数和命令名称触发RowCommand事件。要使其工作的代码如下：
Protected void inizializza_gw_tipi(){
TemplateField order_col = new TemplateField;
order_col.ItemTemplate = new CreateItemTemplateOrdine("imgbtn_up", "~/imgs/Up.gif", "minus", "order");
order_col.HeaderText = "order";
order_col.SortExpression = "order";
gw_tipi.Columns.Add(order_col);
}
这段代码完全正常，但当单击ImageButton时无法触发GridView的RowCommand事件。
编辑： 我在DropDownList的SelectedIndexChanged事件中调用该过程： ddl_tipi_SelectedIndexChanged(Object sender , System.EventArgs e) { inizializza_gw_tipi(); gw_tipi.DataBind(); }
Protected Sub inizializza_gw_tipi()
Using cn As New SqlConnection(shared_foos.connectionString)
Using cmd As New SqlCommand("SELECT nome_tabella, nome_campo_id, nome_campo_nome, nome_campo_descrizione, has_order FROM maschere_tipi WHERE id = @id", cn)
cmd.Parameters.AddWithValue("id", IIf(Session("sel_val") Is Nothing, "", Session("sel_val")))
cn.Open()
Dim rdr As SqlDataReader = cmd.ExecuteReader
rdr.Read()
If rdr.HasRows Then
Dim b_crea_controllo As Boolean = True
'controllo se mettere o no la colonna ordine
If rdr("has_order") = True Then
'controllo che la colonna non sia già stata inserita,
'se è già stata inserita la rimuovo e la ricreo
For i As Integer = 0 To gw_tipi.Columns.Count - 1
If gw_tipi.Columns(i).HeaderText = "ordine" Then
'gw_tipi.Columns.Remove(gw_tipi.Columns(i))
b_crea_controllo = False
End If
Next
If b_crea_controllo = True Then
Dim ordine_col As New TemplateField()
ordine_col.ItemTemplate = New CreateItemTemplateOrdine("lbl_ordine", "ordine", "imgbtn_up", "~/imgs/Up.gif", "meno", "ordine", "imgbtn_down", "~/imgs/Down.gif", "piu", "ordine", AddressOf ImageCommand)
ordine_col.HeaderText = "ordine"
ordine_col.SortExpression = rdr("nome_campo_nome")
gw_tipi.Columns.Add(ordine_col)
End If
End If
b_crea_controllo = True
For i As Integer = 0 To gw_tipi.Columns.Count - 1
If gw_tipi.Columns(i).HeaderText = rdr("nome_campo_nome") Then
b_crea_controllo = False
End If
Next
If b_crea_controllo = True Then
Dim nome_col As New TemplateField()
nome_col.ItemTemplate = New CreateItemTemplateLabel("lbl_nome", rdr("nome_campo_nome"))
nome_col.HeaderText = rdr("nome_campo_nome")
nome_col.SortExpression = rdr("nome_campo_nome")
gw_tipi.Columns.Add(nome_col)
End If
b_crea_controllo = True
For i As Integer = 0 To gw_tipi.Columns.Count - 1
If gw_tipi.Columns(i).HeaderText = rdr("nome_campo_descrizione") Then
b_crea_controllo = False
End If
Next
If b_crea_controllo = True Then
Dim descrizione_col As New TemplateField()
descrizione_col.ItemTemplate = New CreateItemTemplateLabel("lbl_descrizione", rdr("nome_campo_descrizione"))
descrizione_col.HeaderText = rdr("nome_campo_descrizione")
descrizione_col.SortExpression = rdr("nome_campo_descrizione")
gw_tipi.Columns.Add(descrizione_col)
End If
Dim str_order_by As String = " ORDER BY "
Dim str_ordine As String = ""
If rdr("has_order") = True Then
str_ordine = ", ordine "
str_order_by &= "ordine"
Else
str_order_by &= rdr("nome_campo_nome")
End If
Dim sqlds_tipi As New SqlDataSource(shared_foos.connectionString, "SELECT " & rdr("nome_campo_id") & ", " & rdr("nome_campo_nome") & ", " & rdr("nome_campo_descrizione") & str_ordine & " FROM " & rdr("nome_tabella") & str_order_by)
gw_tipi.DataSource = sqlds_tipi
End If
End Using
End Using
End Sub