Browse questions answered by Jon Skeet

How to convert an arbitrary object to enum?

I have an object. Usually it is either long or string, so to simplify the code let's assume just that. I have to create a method that tries to convert this object to a provided...

It feels to me like you only actually want to handle three cases: Input is already the right type Strings Integers in various types I believe this will do what you want for valid input: public object ToEnum(Type enumType, object... more 1/31/2014 2:32:23 PM

Visual studio 2010: Nunit test case fails in debug mode but passes in run mode

I'm having a weird problem with Visual Studio 2010 Ultimate: One of my Nunit(2.6.2) test cases is failing in the debug mode but passing in the run mode, as if we had completely...

You may have run into a situation where you're taking the same code path, but the results are subtly different in debug vs non-debug due to optimizations. There are a couple of distinct possibilities here: Your code has a subtle bug,... more 1/31/2014 12:45:46 PM

Values of process.exitValue() in JAVA

This question is about the values of process.exitValue(). If process.exitValue()=0 its ok, if it's -1 something is wrong, but if it's something else, what does it mean? For...

That's up to the process in question. Even the "0 means success" is a convention more than anything else - although it's a very common one. In general I would assume that any non-zero value is an error of some description; look at the... more 1/31/2014 12:23:01 PM

remove specific object does not work in Java ArrayList

I have an ArrayList of object containing a reference to their parent object. I am trying to remove every objects within a specific parent (so equals to the parent object). If I...

I suspect the problem is that after you've removed element i (which moves everything after it up the list - the element at index n + 1 now has index n etc) you're then skipping the next element. So if you have two consecutive elements to... more 1/30/2014 9:33:04 PM

Output to the screen without moving to a new line

Console.WriteLine automatically move text on a new line and I have output on the console like: 1 2 3 4 5 .. But I need: 1234 5.. Code: for (int i = 0; i < 5; i++) { ...

If you don't want to write a line, don't use Console.Write*Line*. Just use Console.Write: for (int i = 0; i < 5; i++) { for (int j = 0; j < 5; j++) { Console.Write(aField[i, j]); } ... more 1/30/2014 9:28:23 PM

Wait for an Async method to finish from a separate method

Using PostSharp to wrap a WCF Service call with AOP Logging with the OnEntry and OnExit methods for OnMethodBoundaryAspect. Process: OnEntry() is called, a DateTime...

EDIT: Okay, I think I misunderstood you. Basically, you need to remember the Task that you've started, and then you can just call Wait() to wait until it's finished: class LogMethodCallAttribute : OnMethodBoundaryAspect { Task task; ... more 1/30/2014 8:51:23 PM

C# Checking if a query returns empty set not working?

I have been working on trying to check if a record exists in a database table. I have the following code and it is not working. MySqlConnection connection = new...

There are at least two issues here. Firstly, you're calling BeginExecuteNonQuery - that doesn't return an integer, it returns an IAsyncResult. I strongly suspect that you don't want to be dealing with the asynchronous API at... more 1/30/2014 6:49:15 PM

C# Does this object initiation call its constructor?

private Object object1; Does object1 call the default constructor of Object even though it haven't used = new Object(); ? If not, is object1 NULL until it is initialized with...

No, that field declaration just declares a field. It will have a default value of null. From section 5.2 of the C# 5 specification: The following categories of variables are automatically initialized to their default values: ... more 1/30/2014 5:30:08 PM

Recursively calling an async void: any guarantee on the stack limit?

Just facing this curious case, and I wonder whether this pattern will yield any guarantee on the stack usage (i.e. is reliable or not). NOTE: the counter is just an hypothetical...

No, you'll end up with a lot of continuations scheduled on a lot of tasks, rather than a deep stack... at least in the initial call. Note that this is only because you're using await Task.Delay(1000); ... which can reasonably be... more 1/30/2014 4:03:07 PM

SQL Variable current date 1 day

I have a variable that retrieves the current date. select dateformat(getdate(), 'yyyy-mm-dd hh:nn:ss.SSSSSS') What i want to do is change this so it inserts the current date...

I suspect you want DATEADD: select dateformat(dateadd(dd, -1, getdate()), 'yyyy-mm-dd hh:nn:ss.SSSSSS') more 1/30/2014 2:49:34 PM