How to retrieve an element with specific attribute using LINQ to XML with multiple elements with same name?

Question

If I was retrieving a single element, I can use to pull an element named Name.

<li><span>System Name:</span>@(Model.Configuration.Root.Element("Name").Value)</li>

But, when I have multiple elements with the same name, it tells me Sequence contains no elements even though if I do it from code-behind, it gives me elements.

XML file:

<root>
    <Port Num="1">
        <Device>
            <Firmware>1.0</Firmware> 
        </Device>
    </Port>
    <Port Num="2">
        <Device>
            <Firmware>1.0</Firmware> 
        </Device>
    </Port>
</root>

CSHTML file:

<li><span>Port: 1</span>Firmware: @(
Model.Configuration.Root.Elements("Port")
.Where(a=>a.Attribute("Num").Equals("1")).First()
.Element("Device").Element("Firmware").Value)</li>

I want to retrieve the Firmware number (1.0) from Port #1.

Your question has nothing to do with Razor.

SLaks
– SLaks

2013-05-29 15:21:32 +00:00
Commented May 29, 2013 at 15:21 — SLaks
– SLaks, Commented May 29, 2013 at 15:21
@Serge: That's not what he's comparing.

SLaks
– SLaks

2013-05-29 15:23:27 +00:00
Commented May 29, 2013 at 15:23 — SLaks
– SLaks, Commented May 29, 2013 at 15:23
My bad, misread it ^^

Serge
– Serge

2013-05-29 15:24:36 +00:00
Commented May 29, 2013 at 15:24 — Serge
– Serge, Commented May 29, 2013 at 15:24

SLaks · Accepted Answer · 2013-05-29 15:22:19Z

3

.Attribute() return an XAttribute object, which can never be equal to a string.

You want to compare the attribute's value:

Model.Configuration.Root.Elements("Port")
    .First(e => e.Attribute("Num").Value == "1")
    .Element("Device").Element("Firmware").Value

answered May 29, 2013 at 15:22

SLaks

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