gently caress them posted:

Starting to not feel the linq right now.

I kept getting "don't do this For Each because the list doesn't have any elements."

Ok! I'll throw in a drat if statement to make sure the list has a count greater than zero.

So on the line where I go "If (items.Count > 0) Then"

"ArgumentException not handled by user code
Count must have a non-negative value."

I have no clue what is going on. I'm going to just wrap it in a try catch, but honestly, what the hell is going on?

Mr. Crow posted:

This is sage advice and generally the right thing to do when youre frustrated with a problem, you're gonna go far!

Drastic Actions posted:

You can use "items.Any()", which returns a bool if it contains any elements.
But it seems weird that it would throw an error on an empty foreach. Unless it was null, I would think that if it was empty it would just pass over it.

gently caress them posted:

At home for lunch, so paraphrasing.

dim return = LinqToEntities (Or LinqToSql? It's old)

if (return.Count < 0) then
return no results found
else
return the actual data
end if

at "if (return.Count < 0)" it says count must be non negative. When I look at the actual "return" it says the count is 2.

When I get back to work I'll post the whole code.

FrantzX posted:

if return.Count is zero, then the if statement becomes 0 < 0, which is false. You want (return.Count == 0).

FrantzX posted:

if return.Count is zero, then the if statement becomes 0 < 0, which is false. You want (return.Count == 0).

Bognar posted:

Can you post some code?

Are you explicitly catching SocketException, or catching any Exception? If you're just catching a SocketException and the TcpListener is on an async call, it's possible that an AggregateException is being thrown instead.

EDIT: On second thought, this is probably unlikely. Back to line 1 - got any code?

Ithaqua posted:

Just use Any().

gently caress them posted:

Newf posted:

Wait - do solved cases count as negative?

gently caress them posted:

Edit: Naturally if I just put my "make an empty string having object and return that thang" logic into the catch block of a try catch It Just Works!

GrumpyDoctor posted:

I was able to fix it by changing the offending line to

code:

let! client = socket.AcceptTcpClientAsync() |> Async.AwaitTask

so that no exception is thrown when the task is cancelled, but I still don't understand why I wasn't able to catch the original exception. (As an Exception, not any subtype.)

gently caress them posted:

gariig posted:

What?

gariig posted:

What is the value of the parameters passed in? I'm guessing you are getting a negative number for Take/Skip. Also, have you tried doing a ToList() on the query to force the query to be executed earlier?

gently caress them posted:

That if else statement? I made it a Try/Catch And Now It Just Works™.


THAT makes sense.

gariig posted:

Is the Try/Catch working because you are catching the Exception and returning a good value or the Exception doesn't occur because of the try/catch? What part of it "And Now It Just Works™"?

Well what are the values? Although that makes sense is that the root cause?

Bognar posted:

I'm very inexperienced with F#, but my read of that code is that you are calling Async.Start which is starting the server method on the threadpool. If you're not handling exceptions within that method, the exception can not be caught because it's running on a different thread as the first method in its call stack (and therefore not wrapped in a try/catch at any level).

gently caress them posted:

It Just Worked because it ate the exception and instead of crashing just did what I wanted, return json of a blank record.

Just now I added some logic to check if startRow is less than one, and if so, make it 0, so .Skip(startRow) cannot have a negative value. Go figure the old if statement works again. Why the hell would .Skip() failing (or being given a negative value - and why is that allowed?) give me such a crappy exception? "I skipped negative rows so the count is negative." doesn't make any drat sense.

gently caress them posted:

At home for lunch, so paraphrasing.

dim return = LinqToEntities (Or LinqToSql? It's old)

Uziel posted:

OK I have a monolithic Webforms application that uses EXT.Net for the front end. I am looking to convert it to MVC but need a replacement for EXT.Net for as much as possible.

I may need to keep certain parts of it as we use the Ext Calendar for a scheduling system (I'll cross that bridge when I come to it), but for the configuration stuff I want to leverage MVC models/routers/controllers but also avoid the pitfalls of having spaghetti jquery everywhere. Is there a recommended javascript framework or library that I should use? I'm probably just going to default to using Bootstrap for the design.

chmods please posted:

Right now I'm in the middle of upgrading an application which uses Ext.Net 1.5 and I would advise biting the bullet and migrating to straight up Ext. ExtJS 5 has lots of fun new MVVM features which make development a lot easier and a lot of pieces and pages have been a 1 to 1 translation from markup to components, even with jumping ahead two major versions of Ext. My application was all MVC from the start though, so getting in the mindset of having a separate front end was easier. You don't need to use Sencha Cmd, it's pretty easy to structure something in MVC which works with the loader. You can PM me if you have specific questions.

Uziel posted:

I had thought about it but I'd never get approved for the ext js license unfortunately plus we'd still likely need to use ext.net for the calendar portion.

gently caress them posted:

It Just Worked because it ate the exception and instead of crashing just did what I wanted, return json of a blank record.

Just now I added some logic to check if startRow is less than one, and if so, make it 0, so .Skip(startRow) cannot have a negative value. Go figure the old if statement works again. Why the hell would .Skip() failing (or being given a negative value - and why is that allowed?) give me such a crappy exception? "I skipped negative rows so the count is negative." doesn't make any drat sense.

chmods please posted:

There's also a GPL license, if you dig deep enough on Sencha's site. Also, are you referring to the big Google Calendar style view? It's been a while but I seem to think that that's actually a third party product.

Uziel posted:

Oh. Does my code have to be open source in order to take advantage of it? Its for an internal tool, not software that is sold.

If you are using ext for the View, how did you get around duplicate models?

Yeah, its a Google calendar style event scheduler that is from the Ext.NET team and the primary reason we went with that over ext js:
http://examples1.ext.net/#/Calendar/Overview/Basic/

Uziel posted:

Oh. Does my code have to be open source in order to take advantage of it? Its for an internal tool, not software that is sold.

If you are using ext for the View, how did you get around duplicate models?

Yeah, its a Google calendar style event scheduler that is from the Ext.NET team and the primary reason we went with that over ext js:
http://examples1.ext.net/#/Calendar/Overview/Basic/

chmods please posted:

The GPL question depends on the type of product you're building. Internal-only tools should be clean, because it's company IP and so the only users who could request the code work there anyway, but IANAL.

Having duplicate models is unfortunately a fact of life - I have database objects, then .NET model objects which are returned and consumed by web APIs (in some situations, you might think of them like the VM part of MVVM), and then Ext representations of those models. With reflection it would be possible to generate the JS from the .NET classes and save you from maintaining two copies, I think Ext.Net does that anyway. The view models you create for Ext are specific to components though, the models are what will be sent to and received from the server.

That calendar looks like the one from http://ext.ensible.com.

Knyteguy posted:

C# code:

public virtual async Task<JsonObject> GetSettingsFromConfigFile(string configFilePath = @"../../Config/Settings.json")
{
    string content = String.Empty;

    var myStream = await ApplicationData.Current.LocalFolder.OpenStreamForReadAsync(configFilePath);
    using (StreamReader reader = new StreamReader(myStream))
    {
        content = reader.ReadToEnd();
    }

    return JsonObject.Parse(content);
}

public virtual JsonObject GetJsonValueFromServer(string outJson)
{
    Task.Factory.StartNew(async () =>
    {
        JsonObject settings;
        settings = await GetSettingsFromConfigFile();
        ServerUrl = settings["Server"].ToString();

        HttpWebRequest request =
        (HttpWebRequest)HttpWebRequest.Create(ServerUrl);

        request.BeginGetResponse(GetServerCallback, request);
    });
    return null;
}

Knyteguy posted:

So I'm on a deadline trying to learn async programming for the first time
Anyone see what I'm doing wrong here? I understand a little bit of how this works, but I'd probably go non-threaded if I could.

quote:

I can't seem to run through the debugger. It won't let me "f10" over "string content = String.Empty;" (errors happen below upon doing that) and "return JsonObject.Parse(content);" never hits its breakpoint.
Ouput windows says this:

code:

A first chance exception of type 'System.ArgumentException' occurred in mscorlib.ni.dll
A first chance exception of type 'System.ArgumentException' occurred in mscorlib.ni.dll

I assume this has to do with async ignorance.

gariig posted:

What is happening is the Task you are creating from the Task.Factory is starting to run and you are immediately returning null. You need to capture the Task<T> created from the Task.Factory and await it.

ljw1004 posted:

async stuff

Uziel posted:

Awesome thank you. I'm going through some angular tutorials and I'm going to try to evaluate which is the best fit for which parts of the application (since I already have non-MVC ext experience and MVC experience). It looks like the calendar is in extjs5 anyways!