[DOTNET] Accessing struct properties

[Jim Arnold]

Can someone help me get my tiny brain around this?  Given this struct:

struct Foo {

    string _bar;

    public string Bar {
        get{return _bar;}
        set{_bar = value;}
    }
}

Why can I do this:

Foo foo = new Foo();
foo.Bar = "bar";

and this:

Foo[] foos = new Foo[1];
foos[0] = new Foo();

for(int i=0;i<foos.Length;i++) {
    foos[i].Bar = "bar";
}

but *not* this:

Foo[] foos = new Foo[1];
foos[0] = new Foo();

foreach(Foo foo in foos) {
    foo.Bar = "bar";
}


The compiler error is distinctly unhelpful: "The left-hand side of an
assignment must be a variable, property or indexer" - which it plainly is.
I understand why I can't modify the value of an intermediate expression
(CS1612), but what's the deal here?  Am I getting my pass-by-value and
pass-by-ref's muddled?

cheers,

Jim

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