Error1Option Strict On does not allow narrowing in implicit type conversions between method 'Private Sub searchResult_SearchFileMatches(sender As Object, e As Jam.Shell.FileMatchEventArgs)' and delegate 'Delegate Sub EventHandler(sender As Object, e As System.EventArgs)'. on RED Text
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VB.Net just showing its true colors again? When I turn Option Strict On, I am still able to do implicit narrowing conversions in a for each loop.For example, this code actually compiles;
Private Sub foobar()
Dim foo() As foo = {New foo}
For Each bar As bar In foo[code].....
From my understanding of Option Strict, this should not work.See here "Restricts implicit data type conversions to only widening conversions".My code above is a narrowing conversion, and so should be illegal.It will fail at runtime with an InvalidCastException.
C# does the same thing. Below is another implicit narrowing conversion.
private void foobar()
{
foo[] foo={new foo()};[code]......
How can I get round this error: Option Strict On disallows implicit conversions from
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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) {}
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Dim I As Integer
Dim iCount As Integer
Dim clrHashForeColor As Object
Dim clrHashBackColor As Object
cbotifcompression.Items.Add("LZW")
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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.
I have an error in my VB.net program - I have tried various casts etc but it just will not resolve the issue - so reluctantly I post it here to see if anyone else has a similar problem.
Error 1 Option Strict On disallows implicit conversions from 'Object' to 'String'.
Private DS As New DataSet ' Languages
Function TransTxt(ByVal Frm As String, ByVal Item As String) As String
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I get "Option Strict On disallows implicit conversions from 'Object' to 'ExpTreeLib.CShItem'.", which is a listview that I have on my form, which references expTreeLib.dll
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i have this error what i have to change in the code?
TextBox65.Text = Math.Abs(CInt(Val(oddTextBox54.Text))) / Math.Abs(CInt(Val(TextBox56.Text))).ToString()
Error11Option Strict On disallows implicit conversions from 'String' to 'Double'.
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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How do I convert this proper? (Option Strict On)
When I have Option Strict ON in my project, the IDE tells me that "Option Strict On disallows implicit conversions from 'System.Data.ParameterDirection' to 'String'." How can this be, since I'm using their built-in enumeration for the SqlParameter direction.
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I am rather new to OOP and I have, what may be, a simple question. I am developing an architecture for a project that includes some object inheritence trees. I have been running into a bunch of narrowing conversion issues (the old 'Unable to cast object of type x to x' error). I understand the limitations of narrowing conversions and why this error exists, but I'm not quite sure how to get around it architecturally. Here is an analogous problem to mine...
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On one side, in Vb.Net when you add an event handler to an object the created method is named: <NameOfTheObject>_<NameOfTheMethod>.As I like to have consistent syntax I always follow this rule when creating event handlers by hand.On the other side when I create private variables I prefix them with m_ as this is a common thing used by the community, in C# people use to put _ at the beginning of a variable but this is no CLS compliant.
View 1 Repliesi 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
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When you click on a button control on a web form visual studio automatically put in this code for you in the code behind.
Protected Sub btnSave_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnFlightInfo.Click
end Sub
Say for example, I wanted to call this method from another method. How would I do that? I know that the sender is the actual button object, but what is e? Here is what I have so far inside another sub. Just trying to get a better understanding of how this method works.
btnSave_Click(btnSave, ??what would you put there??)
With reference to my previous thread on Paint event handler.. [URL] I went to read up more on Paint Event Handler.. I have a button which draw out a path based on the user selection.. Below contains the drawing of the path portion of the button click event code
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However It did not activate the paint event when I clicked on the button.. Instead, the paint event still activate even before I click on the button? So can anyone teach me on how to activate the paint event when I click on a button?
Dim
Dr As
DataRow
Dr = DataSet11.Jobdata.NewRow
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With Option Strict On, I am getting an error with the above code, which is part of a procedure to add a new record in an 2003 access database table named "Jobdata". The items in Combobox3 is populated by another table in the same database, which has a Status field and a Key field. What I'm trying to do is to insert in the Status field in Jobdata table the correspoding integer value in Key to which ever
status is selected from the combobox.
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
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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
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[code] I get the error message of "Option Strict disallows implicit conversion from Long to UInteger." [code] I dimensioned each variable as a UInteger and not a Long, the values for both X & Y are well below the maximum values of a UInteger as far as I can tell (Data Types Summary). [code]
View 5 RepliesI have a DataGridView that is bound to a list of objects called "BaseChange". The BaseChange objects are made up of 4 properties...
ChangeType
ChangeStatus
ChangeDescription
LastChangeDate
The datagridview has columns for all 4 values as well as a 5th (a checkbox column called "colIsSelected"). There is no problem binding the list to the grid and displaying the items. The problem is that the query that gets the selected items in the grid is giving me an implicit cast error when option strict is enabled.
This is the query...
Dim _changes As List(Of BaseChange)
_changes = (From _row As DataGridViewRow In dgvChanges.Rows() _
Where Convert.ToBoolean(_row.Cells(NAME_COLUMN_IS_SELECTED).Value) = True _
Select DirectCast(_row.DataBoundItem, BaseChange)).ToList()
...and it produces the correct results with option strict off. The implicit cast squiggle is on the "row As DataGridViewRow" code, and the full message is "Implicit conversion from 'Object' to 'System.Windows.Forms.DataGridViewRow'*".
If I exclude the "As DataGridViewRow" from the query, I get a late binding error on the _row.Cells and _row.DataBoundItem and this also fails option strict.I need this to work with Option Strict enabled, and in VB.
The event handlers in my parent class are never called though the events are raised in the child class.
The Code:
Public Class childForm
Public Event checkboxchangedEvent(ByVal checkbox1 As Boolean, ByVal checkbox2 As Boolean)
Private Sub checkboxchanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox1.CheckedChanged, CheckBox2.CheckedChanged
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I am trying to calculate the number of years for my calculate age event handler, however i am apparently missing a method or whatnot because im trying to calculate the age , can anyone suggest help on this. I need to subtract years to get my age but when i try the birthdate.Subtract (currentDate) method i get an error about not able to convert from LONG?
So below is what I have.
Private Sub btnCalculateAge_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculateAge.Click
Dim currentDate As Date
Dim BirthDate As Date
Dim Age As Long
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When I try to read the file, I am getting an error = "Option strict on disallows implicit conversion from string to Char"
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How do I get a Event Handler to fire from within a nother Event Handler?
View 6 RepliesIs there a way to define an implicit conversion operator in VB.NET?
I can't remember ever seeing or hearing of anyone do this; but now I'm in a situation where I think it would be incredibly useful to define my own custom 'type conversion' for my class.
As an example - let's say I have my own class, 'AwesomeDataManager'. It does not inherit from DataTable, but it holds data in a similar fashion to a DataTable. I would to be able to say, 'myDataTable = CType(MyAwesomeDataManager, DataTable)' and have it execute some code inside my class that would return a populated DataTable.
Granted, I could do something like 'MyAwesomeDataManager.GetDataTable' but for the sake of integrating with an existing code base, I'd like to avoid it.
I have the code which checks if there is a selected tab
Private Function GetBrowser() As WebBrowser
If TabControl1.SelectedTab IsNot Nothing Then
For Each c As Control In TabControl1.SelectedTab.Controls
If TypeOf (c) Is WebBrowser Then
Return c
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remove an event handler from within the event handler?
I have a class that gets data from a hand scanner. When the scan is complete and the data is validated, the class fires a custom "ScanComplete" event and returns the data in a custom EventArgs.
In the calling program, I'm creating an instance of the scanning class and adding a handler for the "ScanComplete" event. In the event handler I get the data that was scanned and then remove the handler.
It seems to be working but it feels wrong to remove the handler while I'm running inside the handler. Will this cause a problem?
I'm trying to complete this airline reservation application, but having a problem in this part of the question:Creat an event handler for the FlightBindingSource's PositionChanged event: select FlightBindingSource in the class Name combobox then select position changed in method name combobox to creat the FlightBindingSource's PositionChanged event handler. Write a code to access the currently displayed flight object and pass its flightNumber to method DisplayPassengers as a decimal.This Is my code so far:
HTML
Public Class AirlineReservationForm
Private database As New ReservationsDataClassesDataContext()
Private Sub FillAll()[code].....
Below I create an array of labels. I would like to add an click event to my labels. Can someone point me in a direction?
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