Find an XElement with a certain attribute name and value with LINQ

Question

``` XDocument xDocument = XDocument.Load("..."); IEnumerable elements = xDocument .Element("lfm") .Element("events") .Elements("event"); try { foreach (XElement elm in elements) { comm.Parameters.AddWithValue("extID", elm.Element("id").Value ?? ""); comm.Parameters.AddWithValue("Title", elm.Element("title").Value ?? ""); comm.Parameters.AddWithValue("HeadlineArtist", elm.Element("artists").Element("headliner").Value ?? ""); ``` but I want the value of the element "image" with the attribute "size=large", I have been looking all night, and this is the closest I have come: ``` comm.Parameters.AddWithValue("LargeImage", elm.Descendants("image") .FirstOrDefault(i => (string)i.Attribute("size") == "large").Value); ``` Sample of the part of XML response: ```

Accepted Answer

Try

```
XElement result = elm.Descendants("image")
   .FirstOrDefault(el => el.Attribute("size") != null &&
                         el.Attribute("size").Value == "large");
if (result != null) {
    process result.Value ...
}
```

Starting with C#6.0 (VS 2015), you can write:

```
XElement result = elm.Descendants("image")
   .FirstOrDefault(el => el.Attribute("size")?.Value == "large");
if (result != null) {
    process result.Value ...
}
```

A non-obvious alternative (as @RandRandom pointed out) is to cast the Attribute to `string`:

```
XElement result = elm.Descendants("image")
   .FirstOrDefault(el => (string)el.Attribute("size") == "large");
if (result != null) {
    process result.Value ...
}
```

This works, because because of XAttribute Explicit Conversion (XAttribute to String).

Find an XElement with a certain attribute name and value with LINQ

Solution

Problem