[inline] -- Brent Rector, .NET Wise Owl Demeanor for .NET - an obfuscation utility http://www.wiseowl.com/Products/Products.aspx
-----Original Message----- From: Jim Arnold [mailto:[EMAIL PROTECTED]] Sent: Friday, May 24, 2002 10:00 AM To: [EMAIL PROTECTED] Subject: [DOTNET] Accessing struct properties 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"; [Brent] This changes the Bar property in the Foo valuetype, as expected. and this: Foo[] foos = new Foo[1]; foos[0] = new Foo(); for(int i=0;i<foos.Length;i++) { foos[i].Bar = "bar"; } [Brent] This changes the Bar property in the Foo valuetype in the array element, as expected. but *not* this: Foo[] foos = new Foo[1]; foos[0] = new Foo(); foreach(Foo foo in foos) { foo.Bar = "bar"; } [Brent] Variable 'foo' contains a *copy* of the array element. Foo is a valuetype. You would be changing the Bar property in the copy and never affecting the element in the array. 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 You can read messages from the DOTNET archive, unsubscribe from DOTNET, or subscribe to other DevelopMentor lists at http://discuss.develop.com. You can read messages from the DOTNET archive, unsubscribe from DOTNET, or subscribe to other DevelopMentor lists at http://discuss.develop.com.
