How to remove an item from list without using index?

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Hii ,

I have list items which are coming from database. I want to remove particular item from list item from list before binding that list object to datagrid control. If i go fore removeat (index) option in future i might have problem , because if some databse changes occurs and order changes it will afttect to gridview . So can i remove an item using its name present in list ?

Posted 16-Sep-13 20:31pm

Torakami

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Harshil_Raval 17-Sep-13 2:39am

Yes, just go loop through your list, and find list item and delete it..

V.Lorz 17-Sep-13 3:13am

What type of list are you using for holding the values? What kind of problem you say you'll have in the future?

Torakami 17-Sep-13 3:28am

I am using object list type , its coming to class objects from sp and function is returning this class objecti and i am storing it to list object.

problem is that i want to permantly skip perticular item from list .. but in case if i use index an in future if order of that row changes in databse table .. my index value will be different and it will skip some other item

V.Lorz 17-Sep-13 3:40am

Ok, if you're working with databases most surely you've added each table one column with autogenerated unique indexes. This is normally done for you by most database table editors. The value for this column is automatically generated by the database engine on each new row insertion.

That solves your problem. When you recover your data you somehow keep that index too so you can use it for uniquely identifying your rows (referenced by your objects in your list) in your row updates/deletes/etc.

Torakami 17-Sep-13 3:46am

what are you saying >??? i am not at all using any index from database column ... i am using index in list item

Torakami 17-Sep-13 3:47am

dont give me any compication tricks ... here some is used lamda expressons thats preetty cool .. suggest me on that y its not taking complete string fo r comaparing

V.Lorz 17-Sep-13 3:55am

Yes, your list index will change, but your row id will not and you can combine all together. Perhaps you should consider filtering directly in your database query, not iterating through your list?

Faisalabadians 19-Sep-13 4:20am

are you kidding? how is it possible that you remove an item from list and all remaining items do not change their index in list? oh come on, say you have a list of integers which have item count of five

index: value
0 : 1
1 : 2
2 : 3
3 : 4
4 : 5

if you remove item 3 which have index 2 will result in

index: value
0 : 1
1 : 2
2 : 4
3 : 5

could you clear this? are you trying to track out changes of gridview?

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gajendra_kshatriya · Answer 1 · 2013-09-16T20:44:00

Solution 1

You can use this lamda expression

yourlist.RemoveAll(p=>p.propertyname == "valuetocheck");

Posted 16-Sep-13 20:44pm

gajendra_kshatriya

Comments

Torakami 17-Sep-13 2:58am

i tried this but if i use somthing of this

lstMenu.removeall(p=>p.menuname.tolower()=="company objectives");

its throwing me an error saying company is not present .. as it taking only part company not complete company objectives . i got this when i added a watch on this

gajendra_kshatriya 18-Sep-13 1:15am

Can you paste your some code snippet so i can suggest better?

Faisalabadians 19-Sep-13 4:32am

removing an item from a list in C# will not change all remaining items index?