Thank you Chris. I think the sum total sizes of the "references" for all the objects in the struct and the additional parameters on the method was greater than 256 bytes. I got word back from MS on this issue:
"...generally speaking, when the total size of the arguments passed to a callee function is larger than 256 bytes, JIT will make the caller function partially interruptible. In a partially interruptible code, not every location in the code is a GC safe point. Therefore, it might be unsafe to evaluate expression at certain locations. When this happens you get [the error message]." So it seems that even since the fields were references, the sum of all them exceeded the 256 byte *limit* for the debugger. On 6/21/07, Chris Anderson <[EMAIL PROTECTED]> wrote:
I've been trying to look for a cite, but can only tell you that I was told by a instructor (albeit a SQL Server 2005 one) anything bigger than about 150 bytes was too big (remembering that a reference to a DataTable, etc was only the size of the *reference* and not the size of the data table contents, etc), but really it depends on usage IMO. One cite I *can* find is that "Unless you need reference type semantics, a class that is smaller than 16 bytes may be more efficiently handled by the system as a struct" http://msdn2.microsoft.com/en-us/library/ah19swz4(vs.71).aspx Not that that helps of course :-) > -----Original Message----- > From: Discussion of advanced .NET topics. [mailto:ADVANCED- > [EMAIL PROTECTED] On Behalf Of Mike Andrews > Sent: 22 June 2007 00:01 > To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM > Subject: Re: [ADVANCED-DOTNET] PRB: Cannot evaluate expression because > a thread is stopped at a point where garbage collection is > impossible... > > Very true. > I was just curious. > I'm generally more sparing on my use of structs. > > Nevertheless, I still want to know the maximum size of a struct or if > there > is no size limit, the optimal size of a struct. > > > On 6/21/07, Chris Anderson <[EMAIL PROTECTED]> wrote: > > > > > Does anyone know the maximum size of a struct that can be used in > the > > > Framework without having these issues? > > > > The general rule of thumb is : If you're worrying about the maximum > size > > of a struct, it's already too big! > > > > Structs were designed to be used for small lightweight data types > (like > > Point, Rectangle, etc) > > > > =================================== > > This list is hosted by DevelopMentor(r) http://www.develop.com > > > > View archives and manage your subscription(s) at > > http://discuss.develop.com > > > > =================================== > This list is hosted by DevelopMentor(r) http://www.develop.com > > View archives and manage your subscription(s) at > http://discuss.develop.com > =================================== This list is hosted by DevelopMentor(r) http://www.develop.com View archives and manage your subscription(s) at http://discuss.develop.com
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