2
I need to remove all null fields, which comes from a list of Phones, I tried to do it this way, but unfortunately it didn’t work:
model.Phones = model.Phones.Where(x => x.Phone != null && x.Phone != "")
.Distinct()
.ToList();
received the following error:
Nullreferenceexception: Object Reference not set to an instance of an Object.
Example:
1
I managed to solve,
If anyone needs an answer I did it this way:
model.Phones = model.Phones.Where(x => x != null && x.Phone != null).Distinct().ToList();
0
Try as follows, make sure your lista headphones have some value, and then run logic.
if(model.Phones.Count > 0)
//coloque aqui sua logica
You can check if your phones are filled in too, before adding them in your list, follow example:
if(!string.IsNullOrEmpty(telefone))
//adiciona telefone a lista
In fact, my problem is that as the fields that the user sends are dynamic inputs, example it can have only 1 phone input or 30, it depends on user and it can create the input and send it empty, this generates my problem.
0
Try something like this
model.Phones.RemoveAll(item => item == null);
Exchange the item as your need...
I put in the fiddle: https://dotnetfiddle.net/CVn50U
-1
If you received the Exception NullReferenceException, try the code below, sometimes the field Phones may be null.
if(model?.Phones?.Count > 0)
{
model.Phones = model.Phones.Where(x => !string.IsNullOrEmpty(x.Phone)).Distinct().ToList();
}
I just tried this, but kept getting the error mexmo
Try again, I changed the IF config
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It may seem like a stupid question, but the Nullreference error occurred using this image data?
– Ronaldo Araújo Alves
Not exactly, this image I made with an example, but also generate the error. Where it generated the error instead of being
{Konbase.Areas.Admin....}wasnull– Matheus
In case that phone list is in memory or you bring it straight from the database?
– Guilherme Caixeta
Actually she comes from a
form, i dynamically Gero fields ofTelefoneswithBeginCollection, so the user can type as many phone fields as he wants, thus leaving inputsnullif he doesn’t fill in all.– Matheus
The command is correct. The error probably occurs by a
modelor themodel.Phonesnull. Try to validate ifnullbefore using the command.– Ronaldo Araújo Alves
Your problem then is in sending the form, it should send "only" the phones that have values. But you can delete to be able to remove the values, something like this: "model.Phones.Remove(x => string.Isnullorempty(x.Phone)". With that should solve the problem.
– Guilherme Caixeta