Some help understanding “yield”

Question

In my everlasting quest to suck less I\'m trying to understand the \"yield\" statement, but I keep encountering the same error.

The body of [someMetho

Answer 1

"yield" creates an iterator block - a compiler generated class that can implement either IEnumerable[] or IEnumerator[]. Jon Skeet has a very good (and free) discussion of this in chapter 6 of C# in Depth.

But basically - to use "yield" your method must return an IEnumerable[] or IEnumerator[]. In this case:

public IEnumerable SomeMethod() {
    // ...
    foreach (XElement header in headersXml.Root.Elements()){
        yield return (ParseHeader(header));                
    }
}