C# 从ITemplate内动态创建的ImageButton触发RowCommand事件
我有一个基于DropDownList的值动态创建的GirdView。 我使用ITemplate接口生成字段:C# 从ITemplate内动态创建的ImageButton触发RowCommand事件,c#,asp.net,.net,gridview,rowcommand,C#,Asp.net,.net,Gridview,Rowcommand,我有一个基于DropDownList的值动态创建的GirdView。 我使用ITemplate接口生成字段: public class CreateItemTemplateOrder : ITemplate { ImageButton imgbtn_up; ImageButton imgbtn_down; string s_imgbtn_up_name; string s_imgbtn_up_ImageUrl; string s_imgbtn_
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激发RowCommand,命令参数和命令名绑定到此ImageButton
使其工作的代码是:
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);
}
所有这些代码都可以正常工作,但在单击ImageButton时不会从GridView激发RowCommand
编辑:
我在DropDownList的SelectedIndexChanged事件中调用该过程
ddl\u tipi\u SelectedIndexChanged(对象发送方,System.EventArgs e)
{
伊莉扎·乔·蒂皮();
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
我按原样测试了您的代码。此代码没有错误。此外,row命令也被正确触发。我认为问题在于您创建的动态gridview的eventbinding 要触发row命令,必须在每次回发时创建gridview。这件事应该受到约束 你提供的代码不是我所需要的。它没有网格视图的初始化 以下内容应该会给你一些启示
GridView GV = new GridView(); //Make sure to create the grid view on every postback and populate it. Alternatively (i dont know if its a good practice.) you can store a reference of gridview in session.
GV.RowCommand += new GridViewCommandEventHandler(GV_RowCommand); //bind the row command event. this should solve the problem.
服务器不跟踪动态创建的控件。因此,当回发发生时,gridview控件不存在。因此无法触发任何事件。我也有同样的问题-但我的问题出现在母版页中,其中EnableViewState=“false”。
在我将母版页设置为使用EnableViewState=“true”之后,onrow命令工作正常。@SimoneFoschi:gridview是动态创建的还是动态填充的?因为在所选索引更改事件中没有网格视图的初始化。在这种情况下,您唯一缺少的可能是aspx页面上的OnRowCommand=“rowcommandfunction”。解决了这个问题,我在page_load事件中添加了本地化代码,它按预期触发了rowcommand