Consider the requirement to always declare Option Strict On. We'll always need to declare variables with the As keyword. What would be the type of an anonymous type?Example : Dim product As ... = New With { Key .Name = "paperclips", .Price = 1.29 }
View 2 RepliesI've got the below, where I'm grouping a collection by a propery, then wanting to access the properties of my group. Problem I have is with the anonymous typing. Because of option strict I have to give an explicit type but I can't work out what the type should be. The below doesn't compile because t.HeadAccountKey isn't a value (as t has a type of object). So either I need do some casting or my linq selector is wrong,
[Code]....
How can I get round this error: Option Strict On disallows implicit conversions from
[Code]...
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.
View 3 RepliesJust wondering what the preferred/practised data type conversion technique is?
For example I recently enabled option strict, which in turn found quite a few errors in relation to data types, vb.net prompted me to use CType, which is fine.
However, I have seen other functions for data type conversion, such as .tostring, CInt , Convert, integer.parse and also Ctype.
Why would you use Ctype over the others?
I know its a pretty primitive question , but why do so many conversion methods exist?
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]..................
Given this definition of an incoming byte array I get the following error.
View 7 Replies[Code]...
I really prefer to keep Option Strict On. the proper way to do this?
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?
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?
I'm a Linq noobie, maybe someone can point me in the right direction. What's wrong here? These anonymous types seem to have the same signatures.
[Code]...
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]...
I am tightening up my coding with the Option Strict set to ON. It has now produced alot of errors. An example of this is:
If AllocatedDGV.Rows(i).Cells("RoomNumber").Value = RoomsAvailableDGV.Rows(j).Cells("RoomName").Value Then
It gives me the following error: Option Strict On disallows operands of type Object for operator '='. Use the 'Is' operator to test for object identity.
I need to write an interface to get data to/from our data files.
We have a low level class that holds field values for each record read from the files.
This just holds two values, the value read from the file (DBValue) and the updated value that may need to be written back to the file (CurrentValue).
These values may be any of the standard value types (integer, date etc) or a string.
Either value (DBValue or CurrentValue) may be null if not defined.
I have written the class to manage this data which works fine while option strict is NOT on.
But we have an office policy of having option strict on all the time.
When I put option strict on, my object value comparisons fail with the error: "Option Strict On disallows operands of type Object for operator '='. Use the 'Is' operator to test for object identity."
Question, how should I change the following code to handle option strict on ...
This is all running on Visual Studio 2010
[Code]...
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.
I am sure i am doing something terribly wrong, but i should better ask the experts.
At the third line i get the error Value of type <anonymous type> cannot be converted to <anonymous type>
Dim Query = (From c In Db.web Select New With {.AA = c.AA}).ToList
Dim v = New With {.Amount = 108}
Query.Add(v)
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.
Title says it all really, should I have it off unless I'm having an error, or simply have it on all the time?
View 10 Replieswhat 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.
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?
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'?
View 8 RepliesHow 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
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.
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 '+'.
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)?
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?
View 4 Repliesi'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]
View 2 RepliesI 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].....
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]...
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]...