I am getting the followin error from my code. System.InvalidCastException was unhandled Message="Unable to cast object of type 'QADBASE.DMRDataLists' to type 'QADBASE.DMRData'." Source="QADBASE" I am getting the error in the code below on the createDMRIssue
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I am getting the error in the code below ....
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim prasha As New Person("Prashanthi", "Acharya")
Dim mallika As New Person("Mallika", "Upadhya")
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[code] does anyone knows if there's a infinity function for this code above? like "Dim dd(0 to infinity) as integer
View 1 RepliesI have to use some calculations now and then and sometimes those will give me inf, and sometimes they work, this makes my app very inaccurate...Now i dont know what is causing this, im not dividing zero so far i can see..
(3 + Math.Sqrt(5)) ^ ...
It works for single numbers, But how would i retrieve the ?double? of bigger numbers without getting INF?With bigger numbers i mean really big, like 1477014138.
Im trying to make it so that a user make a selection, with that selection is a IP address (192.168.1.) and than it gets looped and pinged from 2 till 254 strip = string and gets his value out of a case select. from mainpage (so its a public string)But i get an error that it cant get converted to a string and that it should be less than infinity.look code below.. i even tryed to make a seperate integer who adds the 2 others together (strip = 192.168.1. and intcount = 1 2 3 etc, those 2 together gives a full address)i cannot convert the strip to integer cause then it complains on the mainpage about the "cannot convert, should be less than infinity".[code]
View 2 RepliesI'm reading the highest value in my textfile and adding one to the value in my textbox, the problem is once the integer hits 100000 the program will crash, is it possible to make it infinity?[code]...
View 3 RepliesI am using vb express edition 2008. I need to check if an infinity (or NaN) number does exists but I don't know what my mistake is.
Dim Slop1 As Double
Slop1 = (20 - 10) / 0
If Double.IsNaN(Slop1) Then
MsgBox("Check the Coordinates")
End If
whats the diference between the 'IsNaN' and 'IsInfinity' is?
I have 16 buttons assigned a number on the form, the buttons should go from "" to "4" and back to "" again as clicked. If a button in a row, column, or region is the same it should evaluate as a bad move and provide the user with a message box indicating so. I have this working in a different program but I am now attempting to write efficient code. I must have left something out; I get an error when I click on any button stating my value must be less than infinity in my first for next loop. [Code]
View 4 RepliesCertain operations in .Net can give a double variable the values "NAN" or "1.#INF". That's great flexibility but I would rather an exception be thrown any time a double is given one of these values. In my program these values should not exist, and when it does it inevitably leads to an error down the road. I keep trying to put in checks using double.IsNAN or double.IsInfinity but certain things keep slipping by. So there is any setting in .Net to just make it always invalid for a double to be set to these values?
(Edit: also annoying that I think you have to use two checks: IsNaN and IsInfinity to catch these two possibilities. If anyone knows of one check that catches any double that is not a real numeric value it.
Is it possible to assign a pixel value of a binary file to infinity? Lets say that my binary file is composed of 4 pixels only and the values are (1, 4, 8, &)... Would it be possible to assign the fourth pixel to infinity?
View 7 RepliesI have 2 textboxs on Form5.TextBox1 as showing a result and Textbox2 for Input the some value.When user input a value (only two decimal place) then textbox1 showing the result by calculation on form2(DataGridview) and Form4(TextBox)
1.)I try this code but the Textbox1 on Form5 show "Infinity"..Why?
2.)It possible if mouse click on DGV Row(Form2) then automatic calculation depend value what rows
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I have the following problem with MEF: Interface definition to be used by host:
Public Interface IExecuteDoSomething
Inherits IAddinSettings
Event DataReceived As EventHandler(Of DataReceivedEventArgs)
Function DoSomething() As Boolean
End Interface
[Code]...
Everything seems to work fine until the Button2_Click routine is executed, then an InvalidCastException is thrown with the info:Unable to cast object of type 'System.Collections.Generic.List1[SharedLibrary.IExecuteDoSomething]' to type 'System.Collections.Generic.List1[SharedLibrary.IAddinSettings]'.
How can i solve this problem, because the imported object implements both of the interfaces?
The next code works fine in C#:
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But this code crash with a OverflowException in VB.Net.
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Both codes seems the same to me. What is the difference and how can I get the C# code converted to VB.Net?
I have a object type variable (control .Tag) that I need to cast to a structured type, and change a member in. This is a contrived but representative example
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get around this. I have a data base field that is a decimal data type and I want to display it in a text box with the following txtWeekdayRate = CType(RoomsDataRow!WeekdayRate, TextBox)I get the following error when I run my program.Unable to cast object of type 'System.Decimal' to type 'System.Windows.Forms.TextBox'.
View 20 RepliesPublic Function CastToT(Of T)(ByVal GenericType(Of Object) data) As GenericType(Of T)Return DirectCast(data, GenericType(Of T))End Function
The above clearly does not work. Is there any way to perform this cast if I know that all objects inside data are in fact of Type T?
I have an Entity class which Implements IWeightable:
Public Interface IWeightable
Property WeightState As WeightState
End Interface
I have a WeightCalculator class:
Public Class WeightsCalculator
Public Sub New(...)
..
End Sub
Why can I not do wc.Calculate(entities)? I receive:
Unable to cast object of type
'System.Collections.Generic.List1[mynameSpace.Entity]'
to type
'System.Collections.Generic.IList1[myNamespace.IWeightable]'.
If Entity implements IWeightable why is this not possible?
I am passing Date Field to SQL Database. Field is declared as String in the VB.Net Application. I wrote a piece of code for casting to Date
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I'm a C# programmer who is forced to use VB (eh!!!!). I want to check multiple controls state in one method, in C# this would be accomplished like so:
if (((CheckBox)sender).Checked == true)
{
// Do something...
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I have tried everything to no avail. I need to cast the value from a user selected dropdownlist to another dropdownlist on another page. The data in the textboxes are a series of numbers. Also is there a way to display the value in the second dropdown list as well as other values? For example, my dropdown has the values 1-6, user selects 4, which displays first in the dropdown on page 2 but the other values also display in case they want to change there selection??
If Not Page.PreviousPage Is Nothing Then
Dim table As Control = PreviousPage.Controls(0).FindControl("table1")
Dim ddl As DropDownList = CType(table.FindControl("ddlB_Codes"),c DropDownList)
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I'm trying to obfuscate some VB.NET 2003 app.The resulting assemblyes are obfuscated and "run" with some errors.I cleaned all potential reflection problems, but I'm not being able to read the selected value of a combobox.
I load the Combobox using their Datasource properties, using a collection of "VTPair" (a class created by me with 2 properties: one of string type and other of object type to store the value)
This combobox handle pairs like "Male | M" or "Female | F".When trying to see what is selected, I use if mycombo1.SelectedValue = "M" then.This code, after obfuscation, throws me an exception that cannot cast type "XX" to string "M".
So, I changed the code to something more correct, explicitly casting the selected value to String:
if ctype(mycombo1.SelectedValue,string) = "M" then But the error is the same.Debugin my original code, the SelectedValue property is of type "Object" but it is a string.I tried using the ComboBox.SelectedItem property that is also an object but this time what is inside is of type "VTPair" (my own class) and then trying to access its "Value" property (which is of type Object) and trying to cast to string fails again.
Does anyone have an idea to "translate" this piece of code to work OK after Dotfucate it?
I have an object that inherits from an interface. I can create and return the following:
Dim o As IRequest
o = New Request
Return o
This works fine. Now I want to return a List(Of Requests), so I try the following:
Dim o As List(Of IRequest)
o = New List(Of Request)
Return o
The error below is being given on o = New List(Of Request)
System.Collections.Generic.List(Of MyObjects.Request)' cannot be converted to System.Collections.Generic.List(Of MyInterfaces.IRequest)'.Consider using 'System.Collections.Generic.IEnumerable(Of MyInterfaces.IRequest)'
I don't know where it thinks I'm casting.
Here is my property
''' <summary>
''' Gets the GetX509Certificate from a file.
''' </summary>
[Code]....
and heres where it says im doing the illegal cast:
Dim cert As System.Security.Cryptography.X509Certificates.X509Certificate2 = Me.GetX509Certificate
Why is it saying that? Everything is defined in the right type but it still thinks I'm casting.
in vb, you can use text which is in textbox instead of numerical expressions. I mean, if I write 50 in textbox1 and also I can write like that code:
Dim result As Double = TextBox1.Text + 0.4
as you see, I didnt convert any type but it works in vb.net
But I want to learn what are disadvantages of this using?
(I am just talking about arithmetic operations)
i have a property (items) that i want to use for either a checkedlistbox or a standard listbox depending on the value of another property.
heres the code i wrote that doesn't work:
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Say I have a interface called IProperties and I have a collection called colMyProperties that is a collection of IProperties. Then I have an object called clsProperty that implements the IProperty interface. Now, in my code where I add objects to the colMyProperties collection I add a bunch of clsProperty objects. so far so good.
Now when I try to access an object in the collection I can only access properties and methods of the IProperties interface, not the clsProperty object. What am I doing wrong? Do I need to cast the object?
I usually avoid VB's built-in conversion functions (CStr, CDate, CBool, CInt, etc.) unless I need to do an actual conversion. If I'm just casting, say from an object to a string, I normally use either DirectCast or TryCast, under the assumption that CStr, etc., are doing some extra stuff I don't need. But sometimes the DirectCast syntax is a little cumbersome, as in the following example.[code]SqlDataReader.Item returns an Object, which needs to be cast to a String. CStr is easier to read, type, and explain (IMO). My question is, does it matter which one I use? Should I just go with CStr (and CDate and CBool, etc.) and not worry about the extra work I assume those functions are doing? Is there any other downside to using these functions?
View 3 Repliesi have the following code which walks through an Excel file and this works fine note that the following line does work well (folder is being set earlier in the code)
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When I have many controls on a Form (i.e. Label, Button etc) that do almost the same thing, I often use one method to handle all the controls Click, MouseDown, MouseUp events.But to know which of the controls throwing the event and access the properties of that control I need to cast the "sender" object to the correct type.
The thing is that I always know which type it is, I don't really have to "TryCast", "DirectCast" and check if the operation returns true. I some times use CType as well.
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Delegate Sub UpdateTextHandler(ByVal recbuffpass() As Integer)
Private Sub someSub()
Dim f As frmMain = My.Application.OpenForms("frmMain")
f.Invoke(New UpdateTextHandler(AddressOf f.UpdateTextMethod), New Object() {recbuf})
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