Option Infer - Detect Whether The Integer Should Be Int64 Or Int32?
Feb 3, 2011
Will that detect whether the integer should be int64 or int32? What about if we run the program twice. Once we use small numbers and latter we'll use big numbers?
Let's look at this for example: vb.net Dim vector1 As List(Of Int64)Dim vector2 As List(Of Int64) vector1.Sort()vector2.Sort(Function(x As Int64, y As Int64) As Int64Return y - x
What about if I do: vb.net vector1.Sort()vector2.Sort(Function(x As Int64, y As Int64) As Int64Return y - x
[URL]
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May 13, 2009
what does the convert command do in vb.net? and could you tell me what difference is between int32 and int64?
for example
dim h as integer
h=convert.toint32(textbox1.text)
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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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Dec 19, 2011
Possible Duplicate: Best Practices: Option Infer What is the best way to mix VB.NET's Option Strict and the new Option Infer directives? I am developing a old solution, that was translated from VB6 to the VB.NET.Actually, the default options in files are
Option Strict On
Option Explicit On
I want to use LINQ, and found that is easier to use also the Option Infer On. Less to write, less (so, easier) to read.However, a (conservative, from my point of view) part of the team keeps the Option Infer Off and insist do not use it at all, without explicitly explain the causes.In your opinion, what are the "dangers" of using Option Infer On, along with other two options (Strict and Explicit, both On)?
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Mar 4, 2009
Using VS2008, targetting framework 3.5, trying to update some VB4 code. Yes, VB4.I have a bunch of legacy code I'm trying to update, and I had the idea of trying to work through it by executing the old code, working out what was causing each error as I came to it, solving the problem, and then moving on.In order to do this, I have sinned and set Option Strict Off, Option Explicit Off and Option Infer On.Yes, I'm going to hell for this.Problem is, I'm still getthing errors that various things haven't been declared.All of these the items showing errors are in the form: itemName(obj)Is my problem that the compiler thinks that these are method calls for methods which haven't been declared?PS: For anyone wanting to tell me not to use these settings, I already know
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Mar 20, 2009
What do you feel are best practices for the use of Option Infer in your projects? In Visual Studio 2008, Option Infer is a directive that allows the compiler to infer the datatype of a declared variable by looking at what is assigned to it. This is a key feature in VS2008 and is used extensively with LINQ statements and queries. However, turning on Option Infer may create pitfalls for future maintenance programmers.
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Jul 22, 2010
When creating a T4 template in VB.NET, how do you specify Option Explicit, Option Strict,and Option Infer settings? There's some sort of <#@ #> tag for doing this, but I can't find it.
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Jan 29, 2010
I'm passing a type name and some parameters from C# code into a navigation framework written in VB. The navigation framework looks for a constructor on the type that matches the parameters passed in using Type.GetConstructor(Types()). The constructor that I'm looking for expects an array of integers Integer() in vb. But it gets an array of System.Int32. I've gone so far as to try this:
[Code]...
And the VB code still sees System.Int32 on the other end, which means that it doesn't find the constructor.
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Nov 30, 2009
This kind of goes along with my Shut Down & Restart thread from a few weeks ago, but one of the things I'm wondering is if it's possible to detect if the system has Hibernation enabled, or in the case of Win2k if hibernation is even possible.I already know how to hibernate the computer via the Framework:Application.SetSuspendState(PowerState.Hibernate, True, True)but in my program I would like to provide the hibernate option only if the OS A) is new enough to be able to and B) has it enabled in the user's Power Options in the control panel. I can't seem to find anything via Google and MSDN that leads me in the right direction.
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Nov 30, 2009
detect if the system has Hibernation enabled, or in the case of Win2k if hibernation is even possible. I already know how to hibernate the computer via the Framework:
Application.SetSuspendState(PowerState.Hibernate, True, True)
but in my program I would like to provide the hibernate option only if the OS A) is new enough to be able to and B) has it enabled in the user's Power Options in the control panel.
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Nov 2, 2010
To be able to sort a dictionary by value I'm using this code:
Dim idCurrentJobs As IDictionary(Of String, Int32) = New Dictionary(Of String, Int32)
'The string in the dictionary represents a jobname and the integer is a counter for how many jobs im currently are running in the application'
idCurrentJobs.Add("JobName1", 2)
[code]....
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Mar 20, 2011
I am a novice programmer to VB 2008 and I am trying to develop the following code for a game. When I build the following code, an error message appears:
Option Strict On disallows implicit conversion from integer to string.
Another error message
appears: Name FuchsiaTurnScoreLabel is not declared.
Option
Strict
On
Public
Class PlayForm
'Declare integer and decimal variables for calculations
[Code] .....
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May 7, 2011
i am using integer for days and miles, and the calculation is for money so i am using decimal in one function i am allowed to CDec the days for the calculation and the next function it gives me an error.
I dont see where what i am doing is any different than the other.
Function CalcLodging(ByVal intDays As Integer, ByVal decRoom As Decimal) As Decimal
Return (CDec(intDays)) * decRoom ' This function allows the conversion from integer
End Function
[Code].....
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Feb 5, 2011
Option strict on disallows implicit conversion from 'Integer?' to 'Integer', 'Integer' to 'String'
Here's my code which is just a stub. I am working off of some example code and applying it to my own project:
<System.ComponentModel.DataObjectMethodAttribute _
(System.ComponentModel.DataObjectMethodType.Select, False)> _
Public Function GetTrackActivitiesByParams(ByVal ActivityKey As Nullable(Of
[Code]....
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Feb 22, 2010
How do I correct the error Option Strict On disallows implicit conversions from 'Double' to 'Integer'. ?
The two lines below that divide by 2 are causing the error.
Private Function StringToByteArray(ByVal hex As String) As Byte()
Dim NumberChars As Int16 = CShort(hex.Length)
Dim bytes As Byte()
Dim i As Integer = 0
bytes = New Byte(NumberChars / 2) {}
[Code]...
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Sep 2, 2009
Dim I As Integer
Dim iCount As Integer
Dim clrHashForeColor As Object
Dim clrHashBackColor As Object
cbotifcompression.Items.Add("LZW")
[Code].....
I get the error for both highlighted red parts = Option Strict On disallows implicit conversions from 'Integer' to 'Short'.
Also
I get = Option Strict On disallows operands of type Object for operator '='. Use the 'Is' operator to test for object identity.
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Mar 4, 2010
how i have to write this variable not to have errors
Dim divider As Integer = (20 / 3)
Error 1 Option Strict On disallows implicit conversions from 'Double' to 'Integer'
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May 20, 2011
[Code]...
How do I convert this proper? (Option Strict On)
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May 19, 2011
In working with large prime numbers, I appear to have stumbled on a problem. Powers of 2 are showing up okay, but when I try to add or subtract from them, I get erroneous results. Below are the powers of 2, minus 1, for exponents 51 through 56. Notice that, starting with exponent 54, The resulting number is even, which is obviously incorrect. I used data types INT64 and UINT64 and got the same results for each.Here is my code and a partial list of the results:
Dim i, iTest
As UInt64
rtbIsPrime.Text = ""
[code]....
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Apr 4, 2011
Be it in 32 or 64 bit system?
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Sep 24, 2010
How can I convert IntPtr to Int64?
vb
Convert.ToInt64(GetForegroundWindow())
error :Unable to cast object of type 'System.IntPtr' to type 'System.IConvertible'.
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Dec 21, 2009
Im reading data from a VB random file.
Using dim value as int64, the output is: 4674762526611734528 Using dim value2 as date, then converting to dateticks, the value is 627740064000000000 The actual date is: 26/03/1990
Why is the int64 value not the same as the dateticks value?? How do I convert the int64 value to dateticks value?
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Apr 6, 2012
In the following code,
For Each item in MyCollection
...
Next
What does the compiler use to determine the type of item?For example let say I have this class, which is inheriting a non generic collection,
Public Class BaseDataObjectGenericCollection(Of T)
Inherits BaseDataObjectCollection
End Class
A for each loop still infers the Item type as Object. How would I have to modify the above class to make the type inference work?
Edit: Per Beatles1692's answer, Implementing IEnumerator(Of T) kinda works. The base class already has a GetEnumerator function, inherited from CollectionBase, so I my implementation looked like this,
Public Function GetEnumerator1() As System.Collections.Generic.IEnumerator(Of T) Implements System.Collections.Generic.IEnumerable(Of T).GetEnumerator
Return MyBase.Cast(Of T)().GetEnumerator
End Function
However, the for loop still infers the type as object. But, if I change the interface implementation to this,
Public Shadows Function GetEnumerator() As System.Collections.Generic.IEnumerator(Of T) Implements System.Collections.Generic.IEnumerable(Of T).GetEnumerator
Return MyBase.Cast(Of T)().GetEnumerator
End Function
That works, the for loop gets the type inference correct. So I guess the question is now, does For Each just look for a function called GetEnumerator ?
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Jan 24, 2011
(using VB 08!) In order to avoid "magic strings", I have used this handy method (not my own!) many times to get a property's name as a string:
Function GetPropertyName(Of T, R)(ByVal expression As
Linq.Expressions.Expression(Of Func(Of T, R))) As
String
[Code].....
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Feb 4, 2010
I am a beginner in VB, I do know a little code, I am not asking any one to do my work for me. I am just looking for an explantion of what I am doing wrong within my code. I am creating a program where I have to find the answer to the base and exponent. I had everything working until I put option strict on (which is required)for my assignment. My first error is "option strict on disallows implicit conversions from double to integer"and the other is "integer". The error is found in the statement Result = numOne ^ numTwo. Can someone please explain what I have done wrong. If possible in simple terms,as I am new to programming.
Public Class Form1
Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
[code].....
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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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Jan 26, 2010
the combo box style 1 has both the drop down option but also a manual entry option. I need to know how to code it so that when you manually enter data, it takes that data and places it in a text message "The shipping charges for "data" is $15" displaying in a text box. Shouldn't be hard but have developed a mind block.
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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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Oct 13, 2009
whats do Or operator in Vb do when it is applied as follows eg
Dim returnValue As UInt32
Public Const RMA_VC_RET_NULL_PTR_PARAMETER = 1
returnValue = returnValue Or RMA_VC_RET_NULL_PTR_PARAMETER
what does the 3rd statement do?
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Dec 13, 2009
I want to reflect the bit patterns in 2 x int16 (an upper and lower 16 bits) into a single int 32. how can this be done, is bit converter what I am looking for?
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