I am curious to know if there is a way to edit code in C# VS 2008 right when it has hit a breakpoint and I am walking thru the code... can I modify the code (such as the value in a variable or if my stepthrough line is about to hit an if statement ... can I modify the if statement....etc)? So far, I have to stop running VS, modify the code, then hit F5 and wait till the breakpoint is hit again.
When the breakpoint hits, and I am walking thru the code, and I attempt to edit the code, I get a message "Changes are not allowed when the debugger has been attached to an already running pro开发者_运维百科cess of the code being debugged was optimized at build or run time."
There are only a few reasons I know of why Edit+Continue would be disabled in the Debug build. First and foremost is a 64-bit operating system, E+C only works for 32-bit code. Fix that with Project + Properties, Build tab, Platform Target = x86.
It is also an option that might have been turned off. Tools + Options, Debugging, Edit and Continue, Enable checkbox.
If this doesn't help, tell us a bit more about the kind of code you're debugging, the project template you selected when you started the project, how you got the debugger to break and a stack trace copied from the Call Stack window.
Yes, you can.
This is called Edit and Continue.
Note that it has some limitations.
EDIT: You need to switch to a debug build.
To modify the value of a variable or set a property while in break mode go to the Immediate window, set the new value, and hit return e.g.
strValue = "newValue"
Calendar1.Enabled = true
To retrieve a value you can just print it to the window e.e.
?strValue
?Calendar1.Enabled
- Stop running your app.
- Go to Tools > Options > Debugging > Edit and Continue
- Disable “Enable Edit and Continue”.
In response to this question:
can I modify the code (such as the value in a variable or if my stepthrough line is about to hit an if statement ... can I modify the if statement....etc)?
You cannot pop a new value into a variable directly, but what you can do is this:
- Set a breakpoint
- When that breakpoint is hit, click on the arrow in the left margin and drag it up to a previous line
- Now you can add code to change the circumstances (for example, you can set a variable to a new value, add/remove items from a collection, etc.)
See the other answers about enabling Edit & Continue -- in particular, make sure you're in Debug mode.
To solve this problem I did the following...
BUILD > CONFIGURATION MANAGER
Active solution configuration: DEBUG project context configuration: DEBUG
then TOOLS > OPTIONS > DEBUGGING > EDIT & CONTINUE make sure edit & continue is selected
then BUILD > CLEAN SOLUTION then BUILD > REBUILD SOLUTION
Then start debug, then pause, then your code should be editable
Below answer worked for me :
http://whyiamright.wordpress.com/2007/12/20/aspnet-edit-and-continue-in-visual-studio-2005/
The second point says - project-properties-web-> enable edit and continue.
thats it.
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