C# Edit and Continue: error 4027
Error Message
Updating a block statement around an active statement will prevent the debug session from continuing while Edit and Continue is enabled
This error occurs if:
You try to modify part of a foreach statement, a using statement, a lock statement, or a fixed statement, when the execution pointer is inside the modified block.
You try to add a catch to a try when the execution pointer is inside the modified block.
You try to change a try/catch to a try/finally when the execution pointer is inside the modified block.
For more information, see Active Statements.
Consider the following code:
class Program
{
static void Main()
{
using (System.IO.StreamReader file = System.IO.File.OpenText(@"example.txt"))
{
System.Console.WriteLine(file.ReadLine());
}
}
}
If you set a breakpoint on the WriteLine call and start debugging, then try to change the name of the text file in the using statement, this error occurs.
To correct this error
Choose Undo from the Debug menu to undo the changes. You can make the change later when the statement is no longer active.
–or–
On the Debug menu, click Stop Debugging, then make your changes and start a new debugging session.
See Also
Reference
foreach, in (C# Reference)
using (C# Reference)
try-catch (C# Reference)
try-finally (C# Reference)
lock Statement (C# Reference)
Supported Code Changes (C#)
Edit and Continue (Visual C#)