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DataBinder.Eval (Container.Data Item, "date") when date might be missing

bg
Hi!

How do I check if "date" exists before using that code?

I've built a RSSreader and sometimes there's a date in it and sometimes not.
How can I check if it exists to avoid crash (DataBinder.Eva l:
'System.Data.Da taRowView' does not contain a property with the name date)

<asp:DataGrid
id="RssNewsGrid "
AutoGenerateCol umns="False"
runat="server"
AlternatingItem Style-BackColor="#fff fff"
HeaderStyle-BackColor="#fff fff"
OnPageIndexChan ged="ChangePagi ng"
AllowPaging="Tr ue"
Width="100%"
Cellpadding="4"
BorderWidth="0" >
<PagerStyle Mode="NumericPa ges" Visible="False" HorizontalAlign ="Right" />
<Columns>
<asp:TemplateCo lumn>
<HeaderTemplate >
</HeaderTemplate>
<ItemTemplate >
<h2 class="<%=Heade rClass2%>"><%# DataBinder.Eval (Container.Data Item,
"title") %></h2>
<em><%# DataBinder.Eval (Container.Data Item, "date") %>
</ItemTemplate>
</asp:TemplateCol umn>
</Columns>
</asp:DataGrid>
Thank you
/Stefan

Nov 18 '05 #1
6 6472
One solution is to call a method in your page object intead of
DataBinder.Eval , i.e.:

<%# GetDate(Contain er.DataItem %>

Them implement GetDate to look for the optional field and return
String.Empty if not present.

--
Scott
http://www.OdeToCode.com
On Wed, 14 Apr 2004 18:19:20 +0200, "bg"
<st************ **@hotmail.com> wrote:
Hi!

How do I check if "date" exists before using that code?

I've built a RSSreader and sometimes there's a date in it and sometimes not.
How can I check if it exists to avoid crash (DataBinder.Eva l:
'System.Data.D ataRowView' does not contain a property with the name date)

<asp:DataGri d
id="RssNewsGrid "
AutoGenerateCol umns="False"
runat="server"
AlternatingItem Style-BackColor="#fff fff"
HeaderStyle-BackColor="#fff fff"
OnPageIndexChan ged="ChangePagi ng"
AllowPaging="Tr ue"
Width="100%"
Cellpadding="4"
BorderWidth="0" >
<PagerStyle Mode="NumericPa ges" Visible="False" HorizontalAlign ="Right" />
<Columns>
<asp:TemplateCo lumn>
<HeaderTemplate >
</HeaderTemplate>
<ItemTemplate >
<h2 class="<%=Heade rClass2%>"><%# DataBinder.Eval (Container.Data Item,
"title") %></h2>
<em><%# DataBinder.Eval (Container.Data Item, "date") %>
</ItemTemplate>
</asp:TemplateCol umn>
</Columns>
</asp:DataGrid>
Thank you
/Stefan


Nov 18 '05 #2
bg
Hi Scott and thanks for the tip.

I tried that yesterday but don't know what type to declare. DataItem seems
not to exists... String wont work of couse.
public string GetDate2(string sIn)
{

Thanks
/Stefan
"Scott Allen" <bitmask@[nospam].fred.net> wrote in message
news:ss******** *************** *********@4ax.c om...
One solution is to call a method in your page object intead of
DataBinder.Eval , i.e.:

<%# GetDate(Contain er.DataItem %>

Them implement GetDate to look for the optional field and return
String.Empty if not present.

--
Scott
http://www.OdeToCode.com
On Wed, 14 Apr 2004 18:19:20 +0200, "bg"
<st************ **@hotmail.com> wrote:
Hi!

How do I check if "date" exists before using that code?

I've built a RSSreader and sometimes there's a date in it and sometimes not.How can I check if it exists to avoid crash (DataBinder.Eva l:
'System.Data.D ataRowView' does not contain a property with the name date)

<asp:DataGri d
id="RssNewsGrid "
AutoGenerateCol umns="False"
runat="server"
AlternatingItem Style-BackColor="#fff fff"
HeaderStyle-BackColor="#fff fff"
OnPageIndexChan ged="ChangePagi ng"
AllowPaging="Tr ue"
Width="100%"
Cellpadding="4"
BorderWidth="0" >
<PagerStyle Mode="NumericPa ges" Visible="False" HorizontalAlign ="Right" /> <Columns>
<asp:TemplateCo lumn>
<HeaderTemplate >
</HeaderTemplate>
<ItemTemplate >
<h2 class="<%=Heade rClass2%>"><%# DataBinder.Eval (Container.Data Item,
"title") %></h2>
<em><%# DataBinder.Eval (Container.Data Item, "date") %>
</ItemTemplate>
</asp:TemplateCol umn>
</Columns>
</asp:DataGrid>
Thank you
/Stefan

Nov 18 '05 #3
bg
Hi Scott and thanks for the tip.

I tried that yesterday but don't know what type to declare. DataItem seems
not to exists... String wont work of couse.
public string GetDate2(string sIn)
{

Thanks
/Stefan
"Scott Allen" <bitmask@[nospam].fred.net> wrote in message
news:ss******** *************** *********@4ax.c om...
One solution is to call a method in your page object intead of
DataBinder.Eval , i.e.:

<%# GetDate(Contain er.DataItem %>

Them implement GetDate to look for the optional field and return
String.Empty if not present.

--
Scott
http://www.OdeToCode.com
On Wed, 14 Apr 2004 18:19:20 +0200, "bg"
<st************ **@hotmail.com> wrote:
Hi!

How do I check if "date" exists before using that code?

I've built a RSSreader and sometimes there's a date in it and sometimes not.How can I check if it exists to avoid crash (DataBinder.Eva l:
'System.Data.D ataRowView' does not contain a property with the name date)

<asp:DataGri d
id="RssNewsGrid "
AutoGenerateCol umns="False"
runat="server"
AlternatingItem Style-BackColor="#fff fff"
HeaderStyle-BackColor="#fff fff"
OnPageIndexChan ged="ChangePagi ng"
AllowPaging="Tr ue"
Width="100%"
Cellpadding="4"
BorderWidth="0" >
<PagerStyle Mode="NumericPa ges" Visible="False" HorizontalAlign ="Right" /> <Columns>
<asp:TemplateCo lumn>
<HeaderTemplate >
</HeaderTemplate>
<ItemTemplate >
<h2 class="<%=Heade rClass2%>"><%# DataBinder.Eval (Container.Data Item,
"title") %></h2>
<em><%# DataBinder.Eval (Container.Data Item, "date") %>
</ItemTemplate>
</asp:TemplateCol umn>
</Columns>
</asp:DataGrid>
Thank you
/Stefan

Nov 18 '05 #4
Well, it depends on what the DataSource is (an XmlDocument, an
ArrayList, a DataSet, etc).

Something you could try is:

public string GetDate(object o)
{
return String.Empty;
}

and set a breakpoint on the method. Then when you run with the
debugger you can inspect o in a quick watch window and see what type
the data binding is passing. Then go back and declare the method with
the correct type and work from there. A bit of a hack, but like I say,
depending on your DataSource you'll get different types of object
references here.

HTH,
--
Scott
http://www.OdeToCode.com

On Thu, 15 Apr 2004 10:36:43 +0200, "bg"
<st************ **@hotmail.com> wrote:
Hi Scott and thanks for the tip.

I tried that yesterday but don't know what type to declare. DataItem seems
not to exists... String wont work of couse.
public string GetDate2(string sIn)
{

Thanks
/Stefan
"Scott Allen" <bitmask@[nospam].fred.net> wrote in message
news:ss******* *************** **********@4ax. com...
One solution is to call a method in your page object intead of
DataBinder.Eval , i.e.:

<%# GetDate(Contain er.DataItem %>

Them implement GetDate to look for the optional field and return
String.Empty if not present.

--
Scott
http://www.OdeToCode.com
On Wed, 14 Apr 2004 18:19:20 +0200, "bg"
<st************ **@hotmail.com> wrote:
>Hi!
>
>How do I check if "date" exists before using that code?
>
>I've built a RSSreader and sometimes there's a date in it and sometimesnot. >How can I check if it exists to avoid crash (DataBinder.Eva l:
>'System.Data.D ataRowView' does not contain a property with the name date)
>
><asp:DataGri d
> id="RssNewsGrid "
> AutoGenerateCol umns="False"
> runat="server"
> AlternatingItem Style-BackColor="#fff fff"
> HeaderStyle-BackColor="#fff fff"
> OnPageIndexChan ged="ChangePagi ng"
> AllowPaging="Tr ue"
> Width="100%"
> Cellpadding="4"
> BorderWidth="0" >
> <PagerStyle Mode="NumericPa ges" Visible="False" HorizontalAlign ="Right"/> > <Columns>
> <asp:TemplateCo lumn>
> <HeaderTemplate >
> </HeaderTemplate>
> <ItemTemplate >
> <h2 class="<%=Heade rClass2%>"><%# DataBinder.Eval (Container.Data Item,
>"title") %></h2>
> <em><%# DataBinder.Eval (Container.Data Item, "date") %>
> </ItemTemplate>
> </asp:TemplateCol umn>
> </Columns>
></asp:DataGrid>
>
>
>Thank you
>/Stefan
>
>


Nov 18 '05 #5
bg
Hi Scott!

I finally made it after a lot of try and error. Thanks for all the help. I
had problems understanding the object model any ideas where I can learn more
so I get this (including my own code :-> )?
/Stefan

The result:
public string GetDate(Object o)
{
string ret = "";

DataRowView drv = (DataRowView) o;

if (drv.Row.Table. Columns.Contain s("date"))
{
int index = drv.Row.Table.C olumns.IndexOf( "date");
ret = drv.Row.ItemArr ay.GetValue(ind ex).ToString(). Substring(0, 10);
}

return ret;
}
<asp:DataGrid
id="RssNewsGrid "
AutoGenerateCol umns="False"
runat="server"
AlternatingItem Style-BackColor="#fff fff"
HeaderStyle-BackColor="#fff fff"
OnPageIndexChan ged="ChangePagi ng"
AllowPaging="Tr ue"
Width="100%"
Cellpadding="4"
BorderWidth="0" >
<PagerStyle Mode="NumericPa ges" Visible="False" HorizontalAlign ="Right" />
<Columns>
<asp:TemplateCo lumn>
<HeaderTemplate >
</HeaderTemplate>
<ItemTemplate >
<h2 class="<%=Heade rClass2%>"><%# DataBinder.Eval (Container.Data Item,
"title") %></h2>
<em><asp:Labe l CssClass="txtNo rmal" runat="server" Text='<%#
GetDate(Contain er.DataItem) %>' ' ID="Label2" NAME="Label2"/></em>
<asp:Label CssClass="txtNo rmal" runat="server"
Text='<%#DataBi nder.Eval(Conta iner.DataItem, "descriptio n") %>' ID="Label1"
NAME="Label1"/>
</ItemTemplate>
</asp:TemplateCol umn>
</Columns>
</asp:DataGrid>
Thanks again


"Scott Allen" <bitmask@[nospam].fred.net> wrote in message
news:3l******** *************** *********@4ax.c om...
Well, it depends on what the DataSource is (an XmlDocument, an
ArrayList, a DataSet, etc).

Something you could try is:

public string GetDate(object o)
{
return String.Empty;
}

and set a breakpoint on the method. Then when you run with the
debugger you can inspect o in a quick watch window and see what type
the data binding is passing. Then go back and declare the method with
the correct type and work from there. A bit of a hack, but like I say,
depending on your DataSource you'll get different types of object
references here.

HTH,
--
Scott
http://www.OdeToCode.com

On Thu, 15 Apr 2004 10:36:43 +0200, "bg"
<st************ **@hotmail.com> wrote:
Hi Scott and thanks for the tip.

I tried that yesterday but don't know what type to declare. DataItem seemsnot to exists... String wont work of couse.
public string GetDate2(string sIn)
{

Thanks
/Stefan
"Scott Allen" <bitmask@[nospam].fred.net> wrote in message
news:ss******* *************** **********@4ax. com...
One solution is to call a method in your page object intead of
DataBinder.Eval , i.e.:

<%# GetDate(Contain er.DataItem %>

Them implement GetDate to look for the optional field and return
String.Empty if not present.

--
Scott
http://www.OdeToCode.com
On Wed, 14 Apr 2004 18:19:20 +0200, "bg"
<st************ **@hotmail.com> wrote:

>Hi!
>
>How do I check if "date" exists before using that code?
>
>I've built a RSSreader and sometimes there's a date in it and sometimes
not.
>How can I check if it exists to avoid crash (DataBinder.Eva l:
>'System.Data.D ataRowView' does not contain a property with the name
date) >
><asp:DataGri d
> id="RssNewsGrid "
> AutoGenerateCol umns="False"
> runat="server"
> AlternatingItem Style-BackColor="#fff fff"
> HeaderStyle-BackColor="#fff fff"
> OnPageIndexChan ged="ChangePagi ng"
> AllowPaging="Tr ue"
> Width="100%"
> Cellpadding="4"
> BorderWidth="0" >
> <PagerStyle Mode="NumericPa ges" Visible="False" HorizontalAlign ="Right"/>
> <Columns>
> <asp:TemplateCo lumn>
> <HeaderTemplate >
> </HeaderTemplate>
> <ItemTemplate >
> <h2 class="<%=Heade rClass2%>"><%#

DataBinder.Eval (Container.Data Item, >"title") %></h2>
> <em><%# DataBinder.Eval (Container.Data Item, "date") %>
> </ItemTemplate>
> </asp:TemplateCol umn>
> </Columns>
></asp:DataGrid>
>
>
>Thank you
>/Stefan
>
>

Nov 18 '05 #6
I'm glad you have everything working.

Try search for:
dino esposito data binding

Dino has written a number of good articles on various places around
the web.

--
Scott
http://www.OdeToCode.com

On Fri, 16 Apr 2004 13:43:27 +0200, "bg"
<st************ **@hotmail.com> wrote:
Hi Scott!

I finally made it after a lot of try and error. Thanks for all the help. I
had problems understanding the object model any ideas where I can learn more
so I get this (including my own code :-> )?
/Stefan

The result:
public string GetDate(Object o)
{
string ret = "";

DataRowView drv = (DataRowView) o;

if (drv.Row.Table. Columns.Contain s("date"))
{
int index = drv.Row.Table.C olumns.IndexOf( "date");
ret = drv.Row.ItemArr ay.GetValue(ind ex).ToString(). Substring(0, 10);
}

return ret;
}
<asp:DataGri d
id="RssNewsGrid "
AutoGenerateCol umns="False"
runat="server"
AlternatingItem Style-BackColor="#fff fff"
HeaderStyle-BackColor="#fff fff"
OnPageIndexChan ged="ChangePagi ng"
AllowPaging="Tr ue"
Width="100%"
Cellpadding="4"
BorderWidth="0" >
<PagerStyle Mode="NumericPa ges" Visible="False" HorizontalAlign ="Right" />
<Columns>
<asp:TemplateCo lumn>
<HeaderTemplate >
</HeaderTemplate>
<ItemTemplate >
<h2 class="<%=Heade rClass2%>"><%# DataBinder.Eval (Container.Data Item,
"title") %></h2>
<em><asp:Labe l CssClass="txtNo rmal" runat="server" Text='<%#
GetDate(Contai ner.DataItem) %>' ' ID="Label2" NAME="Label2"/></em>
<asp:Label CssClass="txtNo rmal" runat="server"
Text='<%#DataB inder.Eval(Cont ainer.DataItem, "descriptio n") %>' ID="Label1"
NAME="Label1 "/>
</ItemTemplate>
</asp:TemplateCol umn>
</Columns>
</asp:DataGrid>
Thanks again


"Scott Allen" <bitmask@[nospam].fred.net> wrote in message
news:3l******* *************** **********@4ax. com...
Well, it depends on what the DataSource is (an XmlDocument, an
ArrayList, a DataSet, etc).

Something you could try is:

public string GetDate(object o)
{
return String.Empty;
}

and set a breakpoint on the method. Then when you run with the
debugger you can inspect o in a quick watch window and see what type
the data binding is passing. Then go back and declare the method with
the correct type and work from there. A bit of a hack, but like I say,
depending on your DataSource you'll get different types of object
references here.

HTH,
--
Scott
http://www.OdeToCode.com

On Thu, 15 Apr 2004 10:36:43 +0200, "bg"
<st************ **@hotmail.com> wrote:
>Hi Scott and thanks for the tip.
>
>I tried that yesterday but don't know what type to declare. DataItemseems >not to exists... String wont work of couse.
> public string GetDate2(string sIn)
> {
>
>Thanks
>/Stefan
>
>
>"Scott Allen" <bitmask@[nospam].fred.net> wrote in message
>news:ss******* *************** **********@4ax. com...
>> One solution is to call a method in your page object intead of
>> DataBinder.Eval , i.e.:
>>
>> <%# GetDate(Contain er.DataItem %>
>>
>> Them implement GetDate to look for the optional field and return
>> String.Empty if not present.
>>
>> --
>> Scott
>> http://www.OdeToCode.com
>>
>>
>> On Wed, 14 Apr 2004 18:19:20 +0200, "bg"
>> <st************ **@hotmail.com> wrote:
>>
>> >Hi!
>> >
>> >How do I check if "date" exists before using that code?
>> >
>> >I've built a RSSreader and sometimes there's a date in it andsometimes >not.
>> >How can I check if it exists to avoid crash (DataBinder.Eva l:
>> >'System.Data.D ataRowView' does not contain a property with the namedate) >> >
>> ><asp:DataGri d
>> > id="RssNewsGrid "
>> > AutoGenerateCol umns="False"
>> > runat="server"
>> > AlternatingItem Style-BackColor="#fff fff"
>> > HeaderStyle-BackColor="#fff fff"
>> > OnPageIndexChan ged="ChangePagi ng"
>> > AllowPaging="Tr ue"
>> > Width="100%"
>> > Cellpadding="4"
>> > BorderWidth="0" >
>> > <PagerStyle Mode="NumericPa ges" Visible="False"HorizontalAlig n="Right" >/>
>> > <Columns>
>> > <asp:TemplateCo lumn>
>> > <HeaderTemplate >
>> > </HeaderTemplate>
>> > <ItemTemplate >
>> > <h2 class="<%=Heade rClass2%>"><%#DataBinder.Eva l(Container.Dat aItem, >> >"title") %></h2>
>> > <em><%# DataBinder.Eval (Container.Data Item, "date") %>
>> > </ItemTemplate>
>> > </asp:TemplateCol umn>
>> > </Columns>
>> ></asp:DataGrid>
>> >
>> >
>> >Thank you
>> >/Stefan
>> >
>> >
>>
>


Nov 18 '05 #7

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