filter a list inside a class in .net

I have this class models :

public record AllTransactionsResponse
    {
        public List<TransactionItem> Item { get; init; }
    }
    public record TransactionItem
    {
        public string FundCode { get; init; }
        public FundTransactionResponse IssuanceItem { get; init; }
        public FundRedemptionTransactionResponse RedemptionItem { get; init; }
    }

I want to filter some records with FundCode :

        var allTransactions = new AllTransactionsResponse();

        allTransactions = allTransactions.Item.Where(i => i.FundCode!="11277").ToList();

But I get convert error ,I know what is the problem and I should convert the value to target model,But I need the fastest way to do this :

Cannot implicitly convert type 'System.Collections.Generic.List<easy.fund.api.Application.Queries.TransactionItem>' to 'easy.fund.api.Application.Queries.AllTransactionsResponse

There are a couple of issues here.

If you look at this code

allTransactions.Item.Where(i => i.FundCode != "11277").ToList();

you will see that it returns an IEnumerable<TransactionItem> which you then convert into a List<>

But you expect a type of AllTransactionsResponse. So you need to assign it to your Item property within this class

allTransactions.Item = allTransactions.Item.Where(i => i.FundCode != "11277").ToList();

But then you will have another problem. You have declared this property as

public List<TransactionItem> Item { get; init; }

So you can't assign it later.

So then you need to either change this to be of type { get; set; } or use some other method to do this.

As you are assigning the result back to the original item, then you could simply remove then using RemoveAll

int numberRemoved = allTransactions.Item.RemoveAll(delegate (TransactionItem item) { return item.FundCode.Equals("11277"); });

This way you don't need to change your property declaration and it is clearer what you are actually trying to achieve.

I would use RemoveAll method to get the items other then not having FundCode as 11277. like thisallTransactions.Item.RemoveAll(i => i.FundCode == "11277");