Get The Green Squiqly Line Warning At The End Of The Function?
May 1, 2012
In the following function I get the green squiqly line warning at the end of the function that when you hover the mouse over it, it reads: "Function 'AllQuotesDal' doesn't return a value on all code paths. A null reference exception could occur at run time when the result is used.". I've tried and tried to make it correct and safe but it won't compile the way I've tried playing around with the variable 'reader'. It seems to need to be the way I have it but I want that warning to go away.
Code:
Public Function AllQuotesDal() As OleDb.OleDbDataReader
Try
Dim connection As OleDb.OleDbConnection = NewConnection()
Well I've finally decided to upgrade some of my vb6 applications. Anyway I have two forms that are very similar one is customers one is vehicles. One of them is working on form load and one of them isn't. The one that isn't working I've traced the point it stops down to where there is a green line left of the code on the left bar of the development environment. This green line doesn't exist on the form that works. What the green line in this photo means? [URL].
Bigger Picture [URL]. I found a page that says the green simply means the code was saved but it's only on the form that stops working right after the execution of the sql statement. For some reason while stepping through the code it returns to the show command that was called to originally open the form right before the form opens but it skips everything with the green line next to it. I went and disabled tracking and it went away.
warnings got me thinking about old issues that always goofed me up when I was writing more VB.NET code.One of them was the fact that the compiler didn't warn if you declared a Function but never did an explicit Return statement or assign to the Function name. Running Visual Studio 2008, I just made a small experimental project, and it seems as though the behavior has never been fixed.I created a Visual Basic Console application, with the following code:
Module MainModule Sub Main() Dim test As Boolean = TestWarning()[code].....
I also went into the Project Settings and turned On Option Strict and Option Explicit.I also set the Warning Configurations so that "Function/Operator with no return value" was set to Error.I compiled the project and got no warning, and no error on the TestWarning() Function. This seems like a great place to put a warning, because it will default to False, and you may have simply forgotten to do a return. C# will error without a return statement. I thought that VB.NET did the same thing with the "Function/Operator with no return value" configuration. Is this a bug, or is there something I'm missing?
Edit: Further Experimentation
Function TestWarning() As Boolean If DateTime.Now.DayOfWeek = DayOfWeek.Monday Then Return False[code].....
If, and nothing in the Else, there is also no Warning/Error. It will simply take the default, even though you likely intended (via programming style) to have an explicit return. In this case, I explicitly returned False (which is the default for Boolean), so it's likely a hidden bug that I should have returned True in the Else.
> Function LoginPass() As Boolean > Dim LogPass As New waxClass > Dim Ldt As DataTable = LogPass.LoginPass(LCase(UserName_TextBox.Text), > LCase(UserPass_TextBox.Text))
[Code]...
When I try to use the above function it gives a Warning saying:
Function 'LoginPass' doesn't return a value on all code paths. Are you missing a 'Return' statement?
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Warning 2 Variable 'Buf' is used before it has been assigned a value. A null reference exception could result at runtime. I:Users oahDesktopI am CrypterI am CrypterForm1.vb 203 19 I am Crypter
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Public Overridable Function Show(ByVal APrompt As String) As MsgBoxResult mLoad(APrompt, MsgBoxStyle.OkOnly, "") Me.ShowDialog()
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