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SV: RE: CType
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This message was discovered on ASPFriends.com 'aspngvb' list.


=?iso-8859-1?Q?Andr=E9_Colbi=F6rnsen?=
Your button can not refer to 'DataGridEventArgs':

Public Sub sub_Buy(sender As Object, e As
System.Web.UI.WebControls.DataGridItemEventArgs) <-- Problem here

Should be 'EventArgs':

Public Sub sub_Buy(sender As Object, e As
System.Web.UI.WebControls.EventArgs)

Hth

Regards/Halsningar

Andre Colbiornsen
--------------------------------------
Sonnenburg Communications
Bergsgatan 3,
SE-211 54 Malm=F6
Sweden
Tel.: +46-(0)40-97 78 80
Fax.: +46-(0)40-97 78 80
Mob.: +46-(0)708-97 78 79
Mail: Click here to reveal e-mail address
Web.: www.sonnenburg.se
----------------------------------------
B2B Web Solutions - Specializing in .Net
----------------------------------------

-----Ursprungligt meddelande-----
Fr=E5n: Administrator [mailto:Click here to reveal e-mail address]=20
Skickat: den 26 juli 2002 15:48
Till: aspngvb
=C4mne: [aspngvb] RE: CType

Hello Darren,

I try what you have below but I get the following error:

Compiler Error Message: BC30408: Method 'Public Sub sub_Buy(sender As
Object, e As System.Web.UI.WebControls.DataGridItemEventArgs)' does not
have the same signature as delegate 'Delegate Sub EventHandler(sender As
Object, e As System.EventArgs)'.

Line 45:                     </table>
Line 46:                      </ItemTemplate>
Line 47:
<FooterTemplate><Asp:Button ID=3D"btnPurchase" Text=3D"Purchase =
Addesses"
OnClick=3D"sub_Buy" Runat=3D"server" />
Line 48:                     </FooterTemplate>
Line 49:                  </ASP:TemplateColumn>

Here is the exact datagrid:

    <form id=3D"Form1" method=3D"post" runat=3D"server">
        <asp:DataGrid ShowFooter=3D"True" CellPadding=3D"2"
CellSpacing=3D"2" ID=3D"dgCart" DataKeyField=3D"ShoppingCartID"
ShowHeader=3D"True" AlternatingItemStyle-BackColor=3D"LemonChiffon"
AutoGenerateColumns=3D"False" Runat=3D"server"
HeaderStyle-BackColor=3D"LemonChiffon">
                <Columns>
                <Asp:TemplateColumn
HeaderStyle-BorderWidth=3D"0" ItemStyle-BorderWidth=3D"0"
FooterStyle-BorderWidth=3D"0">
                    <ItemTemplate>
                        <Asp:CheckBox
ID=3D"chkTest" Checked=3D"True" Runat=3D"server" />
                        <input type=3D"hidden"
id=3D"WID" value=3D"<%# Container.DataItem("WomanID")%>">
                    </ItemTemplate>
                    <FooterTemplate><asp:Button
ID=3D"btnDelete" Text=3D"Remove" Runat=3D"server" =
onclick=3D"sub_DeleteCartItem"
/>
                    </FooterTemplate>
                </Asp:TemplateColumn>
                <Asp:TemplateColumn
HeaderStyle-BorderWidth=3D"0" ItemStyle-BorderWidth=3D"0"
FooterStyle-BorderWidth=3D"0">
                    <HeaderTemplate>
                        Picture
                    </HeaderTemplate>
                    <ItemTemplate>
                        <a
href=3D"profile.aspx?UID=3D<%# Container.DataItem("WomanID")%>"
target=3D"main"><img src=3D"thumb.aspx?id=3D<%#
Container.DataItem("MainImage")%>" Height=3D"50" border=3D"0"></a>
                    </ItemTemplate>
                </ASP:TemplateColumn>
                <Asp:TemplateColumn
HeaderStyle-BorderWidth=3D"0" ItemStyle-BorderWidth=3D"0"
FooterStyle-BorderWidth=3D"0">
                    <HeaderTemplate>
                        Contact
                    </HeaderTemplate>
                    <ItemTemplate>
                    <table align=3Dleft
class=3Dnoborder>
                        <tr>
                            <td><%#
Container.DataItem("CustomerFirstName")%></td><td><%#
Container.DataItem("City")%>, <%# Container.DataItem("Country")%></td>
                        </tr>
                    </table>
                     </ItemTemplate>
                     <FooterTemplate><Asp:Button
ID=3D"btnPurchase" Text=3D"Purchase Addesses" OnClick=3D"sub_Buy"
Runat=3D"server" />
                    </FooterTemplate>
                 </ASP:TemplateColumn>
             </Columns>
         </Asp:DataGrid>
     </form>

And the exact function:

Sub sub_Buy(ByVal sender As Object, ByVal e As
DataGridItemEventArgs)
Dim i As Integer =3D 0
Dim cb As CheckBox
Dim dgi As DataGridItem
Dim chk As String
Dim chkString As String
Dim htmlInput As HtmlInputHidden
Dim str As String
For Each dgi In dgCart.Items
chkTest =3D e.Item.Cells(0).Controls(0)
If chkTest.Checked Then
htmlInput =3D e.Item.Cells(0).Controls(1)
str =3D htmlInput.Value
chk +=3D (i + 1) & "=3D" & str & "&"
End If
i +=3D 1
Next
chkString =3D "?num=3D" & i & "&" & chk
Server.Transfer("buy.aspx" & chkString)
End Sub

I have tried all of the other methods suggested, and I can't figure out
the problem. =20

Thanks,

John

-----Original Message-----
From: Darren Neimke [mailto:Click here to reveal e-mail address]
Sent: Thursday, July 25, 2002 9:35 PM
To: aspngvb
Subject: [aspngvb] RE: CType

Actually, let me explain further (because my example is still wrong!!)

You had:

    Dim dgi As DataGridItem
    CType(dgi.Cells(0).Controls(2), HTMLInputHidden).ToString

So you are grabbing the Control at Controls(2) - of dgi (is dgi an
*instance* of a DataGrid at this point in time?) - , Casting it to
HTMLInputHidden, then calling ToString() against that *object*.

Basically, you want to use the Cast to grab an *instance* of the actual
HTMLInputHidden object, then use it's properties in the usual manner.

Let's presume that we are attempting to access that control from within
the OnItem event handler of a DataGrid...

    Protected Sub ItemCommand(ByVal sender As Object, ByVal e As
DataGridItemEventArgs)

End Sub

>From within that handler, you can use *casting* to access a specific
DataGridItem...

=09
    Dim dgi As DataGridItem
    dgi =3D CType(e.Item, DataGridItem)

Then you can access the members of that DataGridItem by making calls
against your instance:

    Dim ctl As Control

    For Each ctl In dgi.Cells(0).Controls
        ...
    Next

Of course, in your case, if you know exactly where to look you can go
directly to it using the appropriate Cast:

    Dim htmlInput As HtmlInputHidden
    htmlInput =3D CType(e.Item.Cells(0).Controls(2), HtmlInputHidden)

Then, rather than calling ToString() against the *object*, you call it
against the *property* that you are accessing:

Dim str As String =3D htmlInput.Value

| [aspngvb] member Click here to reveal e-mail address =3D YOUR ID=20
| http://www.asplists.com/asplists/aspngvb.asp =3D JOIN/QUIT

| [aspngvb] member Click here to reveal e-mail address =3D YOUR ID=20
| http://www.asplists.com/asplists/aspngvb.asp =3D JOIN/QUIT
Reply to this message...
 
    
Administrator
Andre,

Unfortunately when I use the "e as System.EventArgs" the 'e.items' is =
not a member of system.eventargs. And I need the 'e.items' to find the =
value of the HTMLInputHidden in the datagrid.

Thanks for the though though.

John=20

-----Original Message-----
From: Andr=E9 Colbi=F6rnsen [mailto:Click here to reveal e-mail address]
Sent: Friday, July 26, 2002 10:17 AM
To: aspngvb
Subject: [aspngvb] SV: RE: CType

Your button can not refer to 'DataGridEventArgs':

Public Sub sub_Buy(sender As Object, e As
System.Web.UI.WebControls.DataGridItemEventArgs) <-- Problem here

Should be 'EventArgs':

Public Sub sub_Buy(sender As Object, e As
System.Web.UI.WebControls.EventArgs)

Hth

Regards/Halsningar

Andre Colbiornsen
--------------------------------------
Sonnenburg Communications
Bergsgatan 3,
SE-211 54 Malm=F6
Sweden
Tel.: +46-(0)40-97 78 80
Fax.: +46-(0)40-97 78 80
Mob.: +46-(0)708-97 78 79
Mail: Click here to reveal e-mail address
Web.: www.sonnenburg.se
----------------------------------------
B2B Web Solutions - Specializing in .Net
----------------------------------------

-----Ursprungligt meddelande-----
Fr=E5n: Administrator [mailto:Click here to reveal e-mail address]=20
Skickat: den 26 juli 2002 15:48
Till: aspngvb
=C4mne: [aspngvb] RE: CType

Hello Darren,

I try what you have below but I get the following error:

Compiler Error Message: BC30408: Method 'Public Sub sub_Buy(sender As
Object, e As System.Web.UI.WebControls.DataGridItemEventArgs)' does not
have the same signature as delegate 'Delegate Sub EventHandler(sender As
Object, e As System.EventArgs)'.

Line 45:                     </table>
Line 46:                      </ItemTemplate>
Line 47:
<FooterTemplate><Asp:Button ID=3D"btnPurchase" Text=3D"Purchase =
Addesses"
OnClick=3D"sub_Buy" Runat=3D"server" />
Line 48:                     </FooterTemplate>
Line 49:                  </ASP:TemplateColumn>

Here is the exact datagrid:

    <form id=3D"Form1" method=3D"post" runat=3D"server">
        <asp:DataGrid ShowFooter=3D"True" CellPadding=3D"2"
CellSpacing=3D"2" ID=3D"dgCart" DataKeyField=3D"ShoppingCartID"
ShowHeader=3D"True" AlternatingItemStyle-BackColor=3D"LemonChiffon"
AutoGenerateColumns=3D"False" Runat=3D"server"
HeaderStyle-BackColor=3D"LemonChiffon">
                <Columns>
                <Asp:TemplateColumn
HeaderStyle-BorderWidth=3D"0" ItemStyle-BorderWidth=3D"0"
FooterStyle-BorderWidth=3D"0">
                    <ItemTemplate>
                        <Asp:CheckBox
ID=3D"chkTest" Checked=3D"True" Runat=3D"server" />
                        <input type=3D"hidden"
id=3D"WID" value=3D"<%# Container.DataItem("WomanID")%>">
                    </ItemTemplate>
                    <FooterTemplate><asp:Button
ID=3D"btnDelete" Text=3D"Remove" Runat=3D"server" =
onclick=3D"sub_DeleteCartItem"
/>
                    </FooterTemplate>
                </Asp:TemplateColumn>
                <Asp:TemplateColumn
HeaderStyle-BorderWidth=3D"0" ItemStyle-BorderWidth=3D"0"
FooterStyle-BorderWidth=3D"0">
                    <HeaderTemplate>
                        Picture
                    </HeaderTemplate>
                    <ItemTemplate>
                        <a
href=3D"profile.aspx?UID=3D<%# Container.DataItem("WomanID")%>"
target=3D"main"><img src=3D"thumb.aspx?id=3D<%#
Container.DataItem("MainImage")%>" Height=3D"50" border=3D"0"></a>
                    </ItemTemplate>
                </ASP:TemplateColumn>
                <Asp:TemplateColumn
HeaderStyle-BorderWidth=3D"0" ItemStyle-BorderWidth=3D"0"
FooterStyle-BorderWidth=3D"0">
                    <HeaderTemplate>
                        Contact
                    </HeaderTemplate>
                    <ItemTemplate>
                    <table align=3Dleft
class=3Dnoborder>
                        <tr>
                            <td><%#
Container.DataItem("CustomerFirstName")%></td><td><%#
Container.DataItem("City")%>, <%# Container.DataItem("Country")%></td>
                        </tr>
                    </table>
                     </ItemTemplate>
                     <FooterTemplate><Asp:Button
ID=3D"btnPurchase" Text=3D"Purchase Addesses" OnClick=3D"sub_Buy"
Runat=3D"server" />
                    </FooterTemplate>
                 </ASP:TemplateColumn>
             </Columns>
         </Asp:DataGrid>
     </form>

And the exact function:

Sub sub_Buy(ByVal sender As Object, ByVal e As
DataGridItemEventArgs)
Dim i As Integer =3D 0
Dim cb As CheckBox
Dim dgi As DataGridItem
Dim chk As String
Dim chkString As String
Dim htmlInput As HtmlInputHidden
Dim str As String
For Each dgi In dgCart.Items
chkTest =3D e.Item.Cells(0).Controls(0)
If chkTest.Checked Then
htmlInput =3D e.Item.Cells(0).Controls(1)
str =3D htmlInput.Value
chk +=3D (i + 1) & "=3D" & str & "&"
End If
i +=3D 1
Next
chkString =3D "?num=3D" & i & "&" & chk
Server.Transfer("buy.aspx" & chkString)
End Sub

I have tried all of the other methods suggested, and I can't figure out
the problem. =20

Thanks,

John

-----Original Message-----
From: Darren Neimke [mailto:Click here to reveal e-mail address]
Sent: Thursday, July 25, 2002 9:35 PM
To: aspngvb
Subject: [aspngvb] RE: CType

Actually, let me explain further (because my example is still wrong!!)

You had:

    Dim dgi As DataGridItem
    CType(dgi.Cells(0).Controls(2), HTMLInputHidden).ToString

So you are grabbing the Control at Controls(2) - of dgi (is dgi an
*instance* of a DataGrid at this point in time?) - , Casting it to
HTMLInputHidden, then calling ToString() against that *object*.

Basically, you want to use the Cast to grab an *instance* of the actual
HTMLInputHidden object, then use it's properties in the usual manner.

Let's presume that we are attempting to access that control from within
the OnItem event handler of a DataGrid...

    Protected Sub ItemCommand(ByVal sender As Object, ByVal e As
DataGridItemEventArgs)

End Sub

>From within that handler, you can use *casting* to access a specific
DataGridItem...

=09
    Dim dgi As DataGridItem
    dgi =3D CType(e.Item, DataGridItem)

Then you can access the members of that DataGridItem by making calls
against your instance:

    Dim ctl As Control

    For Each ctl In dgi.Cells(0).Controls
        ...
    Next

Of course, in your case, if you know exactly where to look you can go
directly to it using the appropriate Cast:

    Dim htmlInput As HtmlInputHidden
    htmlInput =3D CType(e.Item.Cells(0).Controls(2), HtmlInputHidden)

Then, rather than calling ToString() against the *object*, you call it
against the *property* that you are accessing:

Dim str As String =3D htmlInput.Value

| [aspngvb] member Click here to reveal e-mail address =3D YOUR ID=20
| http://www.asplists.com/asplists/aspngvb.asp =3D JOIN/QUIT

| [aspngvb] member Click here to reveal e-mail address =3D YOUR ID=20
| http://www.asplists.com/asplists/aspngvb.asp =3D JOIN/QUIT

| [aspngvb] member Click here to reveal e-mail address =3D YOUR ID
| http://www.asplists.com/asplists/aspngvb.asp =3D JOIN/QUIT
Reply to this message...
 
 
System.ComponentModel.Container
System.EventArgs
System.EventHandler
System.Web.UI.HtmlControls.HtmlInputHidden
System.Web.UI.WebControls.CheckBox
System.Web.UI.WebControls.DataGrid
System.Web.UI.WebControls.DataGridItem
System.Web.UI.WebControls.DataGridItemEventArgs
System.Web.UI.WebControls.TemplateColumn
System.Windows.Forms.CheckBox
System.Windows.Forms.DataGrid




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