CLR debugger and 'var'

Posted by Ken on Stack Overflow See other posts from Stack Overflow or by Ken
Published on 2010-04-30T21:18:06Z Indexed on 2010/04/30 21:27 UTC
Read the original article Hit count: 436

Filed under:

c#

|

debugger

|

.NET

I'm using the CLR debugger (version 8, from "Visual Studio 2005") to debug some C# code. I can step through my code, but for many variables, the debugger won't show me its value. That is, if I type it in the "Immediate" frame or add it to the "Watch" frame, it says "Unable to evaluate the expression.".

It seems to do this a lot for var variables, but I'm also seeing it for parameters and properties, too. I have not been able to figure out what the pattern is.

Is there a rule for when it can display the value of a variable? Is there something I need to do to my code, or in my build script, to make the debugger able to view variables? Or is there a hidden debugger setting?

© Stack Overflow or respective owner

Related posts about c#

.NET WebRequest.PreAuthenticate not quite what it sounds like

as seen on West-Wind - Search for 'West-Wind'
I’ve run into the problem a few times now: How to pre-authenticate .NET WebRequest calls doing an HTTP call to the server – essentially send authentication credentials on the very first request instead of waiting for a server challenge first? At first glance this sound like it should be easy:… >>> More
HttpWebRequest and Ignoring SSL Certificate Errors

as seen on West-Wind - Search for 'West-Wind'
Man I can't believe this. I'm still mucking around with OFX servers and it drives me absolutely crazy how some these servers are just so unbelievably misconfigured. I've recently hit three different 3 major brokerages which fail HTTP validation with bad or corrupt certificates at least according to… >>> More
The dynamic Type in C# Simplifies COM Member Access from Visual FoxPro

as seen on West-Wind - Search for 'West-Wind'
I’ve written quite a bit about Visual FoxPro interoperating with .NET in the past both for ASP.NET interacting with Visual FoxPro COM objects as well as Visual FoxPro calling into .NET code via COM Interop. COM Interop with Visual FoxPro has a number of problems but one of them at least got a lot… >>> More
Dynamic Type to do away with Reflection

as seen on West-Wind - Search for 'West-Wind'
The dynamic type in C# 4.0 is a welcome addition to the language. One thing I’ve been doing a lot with it is to remove explicit Reflection code that’s often necessary when you ‘dynamically’ need to walk and object hierarchy. In the past I’ve had a number of ReflectionUtils that used string based expressions… >>> More
Finding a Relative Path in .NET

as seen on West-Wind - Search for 'West-Wind'
Here’s a nice and simple path utility that I’ve needed in a number of applications: I need to find a relative path based on a base path. So if I’m working in a folder called c:\temp\templates\ and I want to find a relative path for c:\temp\templates\subdir\test.txt I want to receive back subdir\test… >>> More

Related posts about debugger

QtCreator: QML Debugger, connection refused - switch of QML debugger

as seen on Stack Overflow - Search for 'Stack Overflow'
In QtCreator (2.5.2, Win7) I get a permanent / repeating output in the Debugger window. Debugging etc. all fine. Since I do not need QML debugging, how can I switch off the QML debugger? Or fix the issue in order to get rid of the repeating message. QML Debugger: Error: (0) Connection refused QML… >>> More
Debugging stored procedures, without using SSMS 2008 Debugger, or the Visual Studio debugger (output

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a SQL Server 2005 database with some Stored Procedures (SP) that I would like to debug...essentially I would just like to check variable values at certain points throughout the SP execution. I have SSMS 2008, but when I try to use the debugger, I get an error that it can't debug SQL Server… >>> More
Zend Studio Debugger returns Application Error

as seen on Stack Overflow - Search for 'Stack Overflow'
When I run debug for my public/index.php I got an application error as output. I've seen that it occurs at this line: foreach($feed->findFeedEntries($entriesLimit) as $entry) If I put a breakpoint before this, all works as expected, I mean, the error is after the line above. If I remove findFeedEntries()… >>> More
How to pass request variables like controller and action to Zend Studio debugger (zend-debugger)?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, it's the first time I use Zend Studio to debug an application and I'm a little bit lost on how to specify request parameters when debugging as a php script. >>> More
Debug More Effectively with the ADF Debugger

as seen on Oracle Technology Network - Search for 'Oracle Technology Network'
A new article from the Oracle magazine >>> More