PUZZLE Getting DropDownList Index of Matching Value

[Earl Teigrob]

I want to write a function where I pass in a reference to a dropdownlist and
a "match value" and have it returns the index of the dropdownlist item that
matchs (or -1 if there is no match)

private int GetMatchingIndexOfDropDown(ref DropDownList d, string
MatchValue)
{
return [MatchingIndex]
}

I thought it would be super simple but screwed up my first attempt at it.
I thought that a simple foreach with a counter would solve this and it will
under some cercomstances...but not all.

I if use
ManagerDropDown.Items.Insert(0,new ListItem("--Select--",""));

to insert a value into a DropDownList after a databind, it gets iterated to
first but its index value is the largest value. Whoops! Now my simple
interation does not work!

FOR EXAMPLE

private int GetMatchingIndexOfDropDown(ref DropDownList d, string
MatchValue)

{

int i = 0;

foreach (ListItem li in d.Items)

{

if (li.Value == MatchValue)

return i;

i++;

}

return -1;

}



DOES NOT WORK!

So How Do I Do This??? How Do I get the Index Value of the current List
Item??? Or am I on the wrong track...

Thanks

Earl

[Steve C. Orr, MCSD]

This functionality is built into the DropDownList control.

Use the myddl.Items.FindByValue(iMyID) method.
(or the FindByText method)

Here's more info:
[url]http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwebuiwebcontrolslistitemcollectionclass findbyvaluetopic.asp[/url]

[url]http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwebuiwebcontrolslistitemcollectionclass findbytexttopic.asp[/url]

--
I hope this helps,
Steve C. Orr, MCSD
[url]http://Steve.Orr.net[/url]


"Earl Teigrob" <earlt777@hotmail.com> wrote in message
news:O4YJhoFXDHA.1816@TK2MSFTNGP09.phx.gbl...

> I want to write a function where I pass in a reference to a dropdownlist

and

> a "match value" and have it returns the index of the dropdownlist item

that

> matchs (or -1 if there is no match)
>
> private int GetMatchingIndexOfDropDown(ref DropDownList d, string
> MatchValue)
> {
> return [MatchingIndex]
> }
>
> I thought it would be super simple but screwed up my first attempt at it.
> I thought that a simple foreach with a counter would solve this and it

will

> under some cercomstances...but not all.
>
> I if use
> ManagerDropDown.Items.Insert(0,new ListItem("--Select--",""));
>
> to insert a value into a DropDownList after a databind, it gets iterated

to

> first but its index value is the largest value. Whoops! Now my simple
> interation does not work!
>
> FOR EXAMPLE
>
> private int GetMatchingIndexOfDropDown(ref DropDownList d, string
> MatchValue)
>
> {
>
> int i = 0;
>
> foreach (ListItem li in d.Items)
>
> {
>
> if (li.Value == MatchValue)
>
> return i;
>
> i++;
>
> }
>
> return -1;
>
> }
>
>
>
> DOES NOT WORK!
>
> So How Do I Do This??? How Do I get the Index Value of the current List
> Item??? Or am I on the wrong track...
>
> Thanks
>
> Earl
>
>
>
>

[Earl Teigrob]

Thanks

I used this to create

private int GetMatchingIndexOfDropDown(ref DropDownList d, string
MatchValue)

{

d.Items.FindByValue(MatchValue).Selected = true;

int i = d.SelectedIndex;

return i;

}



"Steve C. Orr, MCSD" <Steve@Orr.net> wrote in message
news:%23V1kTHGXDHA.3444@tk2msftngp13.phx.gbl...

> This functionality is built into the DropDownList control.
>
> Use the myddl.Items.FindByValue(iMyID) method.
> (or the FindByText method)
>
> Here's more info:
>

[url]http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwebuiwebcontrolslistitemcollectionclass findbyvaluetopic.asp[/url]

>
>

[url]http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwebuiwebcontrolslistitemcollectionclass findbytexttopic.asp[/url]

>
> --
> I hope this helps,
> Steve C. Orr, MCSD
> [url]http://Steve.Orr.net[/url]
>
>
> "Earl Teigrob" <earlt777@hotmail.com> wrote in message
> news:O4YJhoFXDHA.1816@TK2MSFTNGP09.phx.gbl...

> > I want to write a function where I pass in a reference to a dropdownlist

> and

> > a "match value" and have it returns the index of the dropdownlist item

> that

> > matchs (or -1 if there is no match)
> >
> > private int GetMatchingIndexOfDropDown(ref DropDownList d, string
> > MatchValue)
> > {
> > return [MatchingIndex]
> > }
> >
> > I thought it would be super simple but screwed up my first attempt at

it.

> > I thought that a simple foreach with a counter would solve this and it

> will

> > under some cercomstances...but not all.
> >
> > I if use
> > ManagerDropDown.Items.Insert(0,new ListItem("--Select--",""));
> >
> > to insert a value into a DropDownList after a databind, it gets iterated

> to

> > first but its index value is the largest value. Whoops! Now my simple
> > interation does not work!
> >
> > FOR EXAMPLE
> >
> > private int GetMatchingIndexOfDropDown(ref DropDownList d, string
> > MatchValue)
> >
> > {
> >
> > int i = 0;
> >
> > foreach (ListItem li in d.Items)
> >
> > {
> >
> > if (li.Value == MatchValue)
> >
> > return i;
> >
> > i++;
> >
> > }
> >
> > return -1;
> >
> > }
> >
> >
> >
> > DOES NOT WORK!
> >
> > So How Do I Do This??? How Do I get the Index Value of the current List
> > Item??? Or am I on the wrong track...
> >
> > Thanks
> >
> > Earl
> >
> >
> >
> >

>
>

[Nedu N]

Earl,

The same case works perfectly for me..

ManagerDropDown.Items.Insert(0,new ListItem("--Select--",""));
this also will insert new item as first with with index value of 0.

Also you following fuction works for me..
private int GetMatchingIndexOfDropDown(ref DropDownList d, string
MatchValue)

{

int i = 0;


foreach (ListItem li in d.Items)

{

if (li.Value == MatchValue)

return i;

i++;

}

return -1;

}








"Earl Teigrob" <earlt777@hotmail.com> wrote in message
news:O4YJhoFXDHA.1816@TK2MSFTNGP09.phx.gbl...

> I want to write a function where I pass in a reference to a dropdownlist

and

> a "match value" and have it returns the index of the dropdownlist item

that

> matchs (or -1 if there is no match)
>
> private int GetMatchingIndexOfDropDown(ref DropDownList d, string
> MatchValue)
> {
> return [MatchingIndex]
> }
>
> I thought it would be super simple but screwed up my first attempt at it.
> I thought that a simple foreach with a counter would solve this and it

will

> under some cercomstances...but not all.
>
> I if use
> ManagerDropDown.Items.Insert(0,new ListItem("--Select--",""));
>
> to insert a value into a DropDownList after a databind, it gets iterated

to

> first but its index value is the largest value. Whoops! Now my simple
> interation does not work!
>
> FOR EXAMPLE
>
> private int GetMatchingIndexOfDropDown(ref DropDownList d, string
> MatchValue)
>
> {
>
> int i = 0;
>
> foreach (ListItem li in d.Items)
>
> {
>
> if (li.Value == MatchValue)
>
> return i;
>
> i++;
>
> }
>
> return -1;
>
> }
>
>
>
> DOES NOT WORK!
>
> So How Do I Do This??? How Do I get the Index Value of the current List
> Item??? Or am I on the wrong track...
>
> Thanks
>
> Earl
>
>
>
>