some databinding techniqes neede using in listview -

[mesut]

Hi colleagues,

I hope someone have experience with these databinding techniques in
aspx... and can explain me the reason?

I've got a listview and I would like to fix these #3 problems just to
learn how to do it...

can someone help me what is wrong in my code? I won't get squeezed
line or whatever.. so the syntax looks correct.

( 1 )
this works
<td><%# ((DateTime)Eval("DeliveredDate")).ToShortDateString()%></td>

I would like to do - put date in dd-MMM-yyy
<td><%# ((DateTime)Eval("DeliveredDate")).ToShortDateString("dd-MMM-
yyyy")%></td>

result: CS1501: No overload for method 'ToShortDateString' takes '1'
arguments.
why? how can I get dd-MMM-yyy?????


( 2 )
this works
<td><%# GetCityDescription("Amsterdam")%></td>

I would like to pass in by Eval("flexible city here")
<td><%# GetCityDescription(Eval("City"))%></td>

result: GetCityDescription(string)' has some invalid arguments

NOTE: GetcityDescription is a protected function in code behind...

why can't I use Eval?????? how can I fix this?


( 3 )
this works <td><%# Eval("OrderDate").ToString()%></td>
but I would like to get in dd-MMM-yyyy
<td><%# Eval("OrderDate").ToString("dd-MMM-yyyy")%></td>

I get this error: CS1501: No overload for method 'ToString' takes '1'
arguments


Can someone explain me why I get these errors? I mean why can't I do
these? I would like to understand the reason??


the last thing maybe in the dates what happens if the fields contains
null or are blanks (no date in the table) will that dump? How can I
avoid this than too

thanks
mesut

 

[Lloyd Sheen]

Comments inline:

Hi colleagues,

I hope someone have experience with these databinding techniques in
aspx... and can explain me the reason?

I've got a listview and I would like to fix these #3 problems just to
learn how to do it...

can someone help me what is wrong in my code? I won't get squeezed
line or whatever.. so the syntax looks correct.

( 1 )
this works
<td><%# ((DateTime)Eval("DeliveredDate")).ToShortDateString()%></td>

I would like to do - put date in dd-MMM-yyy
<td><%# ((DateTime)Eval("DeliveredDate")).ToShortDateString("dd-MMM-
yyyy")%></td>

result: CS1501: No overload for method 'ToShortDateString' takes '1'
arguments.
why? how can I get dd-MMM-yyy?????

The function ToShortDateString will return a predefined formatted
string. You want to use toString(format String) to return the format
you want. The applicable format strings for date are found at

http://msdn.microsoft.com/en-us/library/az4se3k1.aspx

( 2 )
this works
<td><%# GetCityDescription("Amsterdam")%></td>

I would like to pass in by Eval("flexible city here")
<td><%# GetCityDescription(Eval("City"))%></td>

result: GetCityDescription(string)' has some invalid arguments

NOTE: GetcityDescription is a protected function in code behind...

why can't I use Eval?????? how can I fix this?

Not close to VS at present but you want to look for page methods as the
cure for this problem.

( 3 )
this works <td><%# Eval("OrderDate").ToString()%></td>
but I would like to get in dd-MMM-yyyy
<td><%# Eval("OrderDate").ToString("dd-MMM-yyyy")%></td>

I get this error: CS1501: No overload for method 'ToString' takes '1'
arguments

You need to cast "OrderDate" to a date to be able to use the format
string (see above for applicable string values"

Can someone explain me why I get these errors? I mean why can't I do
these? I would like to understand the reason??


the last thing maybe in the dates what happens if the fields contains
null or are blanks (no date in the table) will that dump? How can I
avoid this than too

thanks
mesut

LS

 

[Stan]

Hi colleagues,

I hope someone have experience with these databinding techniques in
aspx... and can explain me the reason?

I've got a listview and I would like to fix these #3 problems just to
learn how to do it...

can someone help me what is wrong in my code? I won't get squeezed
line or whatever.. so the syntax looks correct.

( 1 )
this works
 <td><%# ((DateTime)Eval("DeliveredDate")).ToShortDateString()%></td>

I would like to do  - put date in dd-MMM-yyy
 <td><%# ((DateTime)Eval("DeliveredDate")).ToShortDateString("dd-MMM-
yyyy")%></td>

result: CS1501: No overload for method 'ToShortDateString' takes '1'
arguments.
why? how can I get dd-MMM-yyy?????

( 2 )
this works
<td><%# GetCityDescription("Amsterdam")%></td>

I would like to pass in by Eval("flexible city here")
<td><%# GetCityDescription(Eval("City"))%></td>

result: GetCityDescription(string)' has some invalid arguments

NOTE: GetcityDescription is a protected function in code behind...

why can't I use Eval??????  how can I fix this?

( 3 )
this works <td><%# Eval("OrderDate").ToString()%></td>
but I would like to get in dd-MMM-yyyy
<td><%# Eval("OrderDate").ToString("dd-MMM-yyyy")%></td>

I get this error: CS1501: No overload for method 'ToString' takes '1'
arguments

Can someone explain me why I get these errors? I mean why can't I do
these? I would like to understand the reason??

the last thing maybe in the dates what happens if the fields contains
null or are blanks (no date in the table) will that dump? How can I
avoid this than too

thanks
mesut

In addition to what Lloyd has said the key point here is that the
Eval() function returns an object which has to be cast to the required
type. Normally the DataBinder does this for you but if you have more
complex expressions requiring intermediate evaluation steps then you
have to embed type casting or conversion methods in the <%# ... %>
expression.

In your case (2) your could try
GetCityDescription(Eval(<cityName>).ToString())

 

[mesut]

thank you very much LS and Stan.

thanks to the information you sent I solved the problem.

many thanks again...


mesut