CODEWITHSUNDEEP
asp.net-mvcasp.net-mvc-4lambda
user1282609
user1282609

Reputation: 575

FirstOrDefault on List not working

I have a list like 

var listDataDemo = model.Jobs.ToList();

The listDataDemo has data like following

Count = 13
[0]: {PaymentItemModel}

when i type in Immediate Window like 

listData.FirstOrDefault()

it gives result

Amount: 0
Date: {1/01/0001 12:00:00 AM}
Method: "PayPal"
PayerName: null
PayerNumber: null
PaymentDetailType: Payment
TransactionId: null

But when i write(code in my class)

var demoVal = listData.FirstOrDefault(p=>p.Method=="PayPal")

The name 'demoVal' does not exist in the current context(no value)

How to get a value from LIST.

Please help me.

Upvotes: 0

Views: 3353

Answers (3)

Sebastian Nemeth
Sebastian Nemeth

Reputation: 6175

Off the cuff, the predicate you're providing to FirstOrDefault to filter results looks like it has a syntax error: (p=>p.Method="PayPal") should be (p=>p.Method=="PayPal").

Granted this was probably a typo, for completeness:

'=' is an assignment operator, for when you want to assign a value to a variable.

'==' is an equality comparison operator, for when you want to test equality between values and get 'true' or 'false'.

Edited to answer beyond the typo...

Are you using Entity Framework? EF has extension methods for FirstOrDefault also, except the filter parameter is an SQL query. If you're using EF, then you could be missing the following:

using System.Collections.Generic;
using System.Linq;

Upvotes: 1

Hitesh
Hitesh

Reputation: 3860

The below code is working fine for me. Just have a look:

        List<test> testList = new List<test>();

        testDB testObj = new testDB();
        testList = testObj.fn_getAll();
        var abc = testList.FirstOrDefault(a => a.Id == 3);

And you just try to change the name of the variable, this might be causing the issue.

I hope it will help you.. :)

Upvotes: 1

Timothy Shields
Timothy Shields

Reputation: 79441

It looks like the predicate in your call to FirstOrDefault has a typo. You want == for comparison, not = for assignment.

Upvotes: 0

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