Option Strict On - Complain About Casting Image To Bitmap?
May 18, 2010
Why does "OPTION STRICT ON" complain about casting an Image to Bitmap. When CTYPE is not used but not the other way around?
Dim img As Image = Image.FromFile(My.Computer.FileSystem.SpecialDirectories.MyPictures & "ExampleFile.jpg")
'This is okay with OPTION STRICT ON.>>
Dim bmp As Bitmap = CType(img, Bitmap)
'OPTION STRICT ON allows this but why? >>
PictureBox1.BackgroundImage = bmp
'Why not? >>
PictureBox1.BackgroundImage = CType(bmp, Image)
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Oct 17, 2009
How can I get round this error: Option Strict On disallows implicit conversions from
[Code]...
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Mar 28, 2010
I have to take over a project written in vb.net, which contains more than 400k lines of code written in option strict off mode. I want to build it under option strict on first before I do anything else -- which maybe converting it into C#. I found there's thousands of lines of code raises compilation error, mostly are about implicit type casts. Is there any tool would help to make it compile under option strict on mode if I don't want to correct every single line manually? Because it's really painful to add CStr/CInt invocation into every line of Code myself.
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Sep 7, 2010
I turned Option Strict On and i get an error on all the ".Cells" lines saying option strict on disallows late binding.
a = 1
b = 3
c = 2
d = 1
With oSheet
[CODE]..................
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Jun 30, 2011
[Code]...
I really prefer to keep Option Strict On. the proper way to do this?
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Apr 13, 2011
I have inherited a VB.NET application that I need to compile so I can run dorkumentation on it. I first received "Option Strict On disallows implicit conversion from x to y" errors, so I turned off the Option Strict option in the Project file.
So why do I still fail with the same error message?
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Feb 22, 2011
I really like the coding speed that vb.net provides, but I don't like the possibility to forget to declare variable types, return types of functions, etc. and that is why in each class I use[code]..
Is there a way to define those two options on the project/solution level?
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Feb 24, 2010
what does these two code means in vb.net: Option Explicit on Option strict on i think option explicit means the compiler is not going to do any kind of conversion and i need to do all of them by the code;also it becomes case sensitive i.e;
[Code]...
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Feb 22, 2011
1. I have read that keeping Option strict on and Option infer off is good practice and will insure your code is tight and properly written. I would like input regarding this, pro's and con's from those who are in the know.
2. Having said that, I have set Option strict on and Option infer off in an existing program I wrote (that was working perfectly mind you) with them off and on respectively. I went through and cleaned up all the errors on the 'need AS' and casting of variables, but one is leaving me a bit put out.[code]
I have also read where using My.Computer.System.Directory.GetFiles() instead of System.IO.Directory.GetFiles() is probably not a good thing, but when I change to this I get no error, but also no dataI am thinking I should stay with the strict on and infer off but am really slogging through getting this code correct.Running Win7 on Dual Quad Core XEON Intel Extreme with 8Gb RAM.
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Nov 25, 2010
Dim frm As mshtml.HTMLFormElement
Dim sel As mshtml.HTMLSelectElement
Dim hi As mshtml.IHTMLElementCollection
Dim inp As mshtml.HTMLInputElement
[code].....
Looks to me that childnodes object has a more specific type. But what? Not ihtmlcollection. The type support some item interface.
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Dec 7, 2009
Title says it all really, should I have it off unless I'm having an error, or simply have it on all the time?
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Jun 28, 2010
what do you thinkg about comment below? original article url is also suggested to read.I didnt get why my code will be faster if i use it on. anyone has good knowledge about it?
Although Visual Basic .NET allows you to perform implicit type conversions and late binding, you should avoid these practices. Implicit type conversions and late binding may lead to severe performance problems, runtime errors, code that is difficult to read and maintain,and sub-standard programming practices.Many VB.NET professional programmers believe that leaving OPTION STRICT OFF by default was perhaps Microsoft's worst decision in the VB.NET implementation. Use OPTION STRICT ON.
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Jan 25, 2012
I have an old programme that was written with 'option strict off' I have been steadily working through it mainly sorting out casting issues but have come up against some that I dont understand.for instance I have a checkbox called tickbox
dim Tickbox as new checkbox
later in the code
dim blah as boolean = Me.Tickbox.CheckState
but option strict insists i cast it as a boolean
dim blah as boolean = CBool(Me.Tickbox.CheckState)
surely the checkbox.checkstate is Booleean?
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Jun 30, 2009
Do you use 'strict off' option, 'explicit off'? Or may be 'strict custom' and some other options like 'Implicit type. Object assumed', 'Late binding', 'Implicit conversion'?
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Oct 21, 2011
How to test for DataGridViewCell.Value with Option Strict On?
If DataGridViewCell.Value = "some value" then
Gives the error:
Option Strict On disallows operands of type Object for operator '='. Use the 'Is' operator to test for object identity.
EDIT:
The Solution is:
If DataGridViewCell.Value.ToString = "some value" then
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May 26, 2012
I'm facing a trick issue with LINQ. I generate the above code:[code..]
Everything is running well if I turn off Option Explicit. When I turn it on, compiler is showing me a meessage: Expression is of type 'Object', which is not a collection type. Referencing to lResult variable.
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Jun 14, 2011
If a field called X in a datarow called R is an int32 and Y is an int32 how can I make this statement work:
r!x += y
with option strict on.
Error 8 Option Strict On prohibits operands of type Object for operator '+'.
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Nov 24, 2010
Having just spent the past several hours trying to work out why my Xml Serialization code was not working. Consider the following:
<DefaultValueAttribute(False)>
Public Property UserName() As String
Why is this allowed regardless of option strict being on (or not)?
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Mar 1, 2011
Whenever I created a new VB.NET program I must go into project's proerties and set 'option strict' on. Can I do that once so it is a default for every time I create new project?
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Dec 28, 2011
i'm encountering the following problem. I recently activated 'Option Strict On' and now I get an error in my LINQ query. From e As TEnum returns the following error: Option Strict On disallows implicit conversions from 'Object' to 'TEnum'. [code]
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May 25, 2012
I have a DataGridview in which one column is a checkbox. I use the following code to check/uncheck the box whenever the cell is clicked.
Private Sub dgUnscheduled_CellClick(sender As Object, e As System.Windows.Forms.DataGridViewCellEventArgs) Handles dgUnscheduled.CellClick
If dgUnscheduled.CurrentRow.Cells(0).Value = True Then
[code].....
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Dec 29, 2009
Option Strict Off
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim num1 As Integer = Integer.Parse(num1TextBox.Text)
[code]...
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May 20, 2011
i have a Problem with UNION for LINQ to SQL I have my LINQ query
Dim dc As New ContainerDB.DataClassesDataContext()
Dim test = (From container In dc.GetTable(Of tbl_container)() Where container.pkContainerID = iPkContainerID).Union( _
From containerHist In dc.GetTable(Of tbl_containerHIST)() Where containerHist.pkContainerID = iPkContainerID)
[Code]...
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Jan 11, 2011
I have a section that compiles basic boolean expressions at runtime, such as:CustomerBirthDate > "1/1/1940"At runtime it works perfectly. The generated code file contains "Option Explicit Off" at the top and when I call compiler services, I pass the option /optionexplicit-
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May 22, 2010
Is there an equivalent for the C# 4 'dynamic' keyword when using 'type safe VB.Net', i.e. with Option Strict On?
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May 8, 2012
I have my code working well but with OPTION STRICT OFF. I have decided to fixed all my errors in the code.However after setting the OPTION STRICT to "On", my code have lots of errors. I was able to fixed most of the errors with the except of this DIM statement where I think I have to insert CDate to (Mid$(row("TIME"), 12, 8) >= minTime) and (Mid$(row("TIME"), 12, 8) >= maxTime):
[Code]...
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Dec 11, 2009
I have strongly typed code which throws a Late binding Disallowed due to Strict On exception. Is there a way to allow late binding, without turning my stict option to off?
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Jan 22, 2010
I tried to initialize a textbox value by using the .Text property
Textbox.Text = 0
But Im getting the error Option Strict On disallows implicit conversions from 'Integer' to 'String'.
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Jun 22, 2010
I can run the code fine without the Option Strict on, but once it's turned on, I run in to a "Option Strict On Disallows Late Binding"...why!?! I can't figure out how to fix it....
'Option Strict On'
Public Class StateFinderForm
Private Sub FullStateNameRadio_CheckedChanged(ByVal sender As System.Object, ByVal e As
[code].....
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Sep 22, 2010
I just turned Option Strict On in one of my existing projects that I'm enhancing. That caused a sea of errors to showup in the project. Now I have much to fix or I can put it back to OFF. Before I started to fix all these errors I need to catch my breath. Do you guys guys work with Option Strict On?
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