VS 2010 DataGridView - Array - Custom DataType?
Dec 20, 2010I have a large text file that I am going to be parsing. Each line can contain a variety of Specific Variables.
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VS 2010 : Copy This Array To A Temp Array So That The Temp Array Has All The Same Values As The Original Custom Array?
Jun 19, 2011I have an array of people stored in a custom structure array... how can i copy this array to a temp array so that the temp array has all the same values as the original custom array?
View 4 RepliesVS 2010 Custom Type Array / List With Adding Items And Specifying Custom Type Variable
Jun 21, 2011I recently downloaded VB 2010 Express so i am quite new to the language, but i have worked with dark basic, which seems to b very similar.Anyway, my problem is that i cannot seem to correctly set out my array of a custom type/class. i am trying to create two arrays, one of available entities and another of selected entities of which the user selects the entities to be dealt with in irrelevant ways. i have creates a button (called test) which adds some entities to the available list and all the entities come back the same value but they shouldnt be as you'll c in the code. i have run the step into command a found that "available.item(#).Name = " will change all of the entity's names.As of current i am working with lists as the array kept asking for a 'new' statement but i couldnt figure out where to put it.[code]
View 7 RepliesCustom Function Return Type + Input As Variable Datatype?
Dec 1, 2010I'm wondering whether its possible to have a function's return type and input arguments as a variable.
For example this function:Private Function MyFunction(ByVal argument1 As VariableType) As VariableType
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VS 2010 - DataGrid Custom Class Array
May 14, 2012I am working on a project which lets the user edit the students in a certain group using a datagrid. First I created a class called student and then I created a student-array. Displaying the students in a datagrid works fine. On form-load, I change the datagridview.datasource to the student-array. The datagrid has 20 rows by default (Public dbstudebt(0 To 19) As student). When I edit an existing student everything works fine but when I fill something in in an empty cell and press enter or tab to confirm and add a new student, it just clears the cell and nothing happens. So basically, editing existing studs in the datagrid works fine, making new student doesn't work at all as those cells are always cleared immediately.
View 4 RepliesVS 2010 DataGridView Custom Grid Color For 1 Cell
Aug 30, 2011I've been trying to customise a datagridview but no luck so far, thing is, i want some of the cells to not have the same grid colour and width as all the rest of the grid. Do you guys know how can this be done? I know it is possible cause i've seen it before but i have no clue how to accomplish that.
View 4 RepliesCreating A Byte Array Using Long Datatype?
May 4, 2009Most of the time when we read the file stream into a byte array, we would write the following code.[code]But here we have to convert Length into an integer type (line 2 of the code above) since we cannot declare a byte array using the long data type (with option strict on). Is this a good practice? What is the work around for this problem?
View 1 RepliesGet And Use Datatype Of Sorted Column In Datagridview ?
Jan 13, 2012What i am trying to do is get the data type of the sorted column that the user selects in order to properly convert a variable. the variable will be used to locate similar values in the dataset that populates the datagrid view.
View 10 RepliesUsing Datatype Object And Determine Datatype In Class Property - Several Integers Columns That Are Null In The Db?
Mar 8, 2010anything wrong with using datatype object and determine datatype in class property? I have a typed dataset and it has several integers columns that are null in the db. and when I make a call it throws exception.is there anythign wrong with setting it as object in my dataset.. changing the throw exception property to Nothing and passing it to my property as integer?
for each row in myDS.DataTable
cRate.CustID = row.CustID
next row
and in my class
Public Property CustID() As Integer
Get
Return _custID[code].............
Money Datatype On Datagridview Has 4 Decimal Places?
Apr 23, 2009I have tried clicking on the datagridview on my form then selecting "advanced" under databindings on the property window and setting it to 2 decimal places but nothing seemed to change. May I know what I have done wrong?
View 5 Replies2008 Passing In SQL Parameter Where Datatype Is Date Array (SQL Server 2005)?
Jan 28, 2010I'm attempting to pass in a collection of dates to a T-SQL 'IN' clause via a date array (see below for how data is collated).
'Workout weeks difference between start and enddate
Dim wksDifference As Integer = CType(DateDiff(DateInterval.WeekOfYear, bookingStartDate, bookingEndDate), Integer)
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C# - Datatype For Multidimensional Array That Keeps Growing Depending On The Previous Values Of Cells?
Jan 20, 2012I am looking for an elegant datatype and method to handle this problem below in Java or dot Net environment (C# or VB.net)It is a (r x c) matrix of numbers (integers). The 1st column values is a 1D array (range of numbers). The 2nd column takes a different range of values for each of the 1st column value (so, its basically a 2D jagged-array). The 3rd column has a range of value for each pair of 1st and 2nd column values.(when the 1st and 2nd column is fixed with a value, the 3rd column takes a range of values). The number of columns is not fixed and depends on the user input. It can go up to 20 or even more
How do you handle this problem efficiently in java or C# or VB.net.I am linking an image to the equation that I want to program. , in-which C and S are some constants. i=1,2,3...r (number of rows) and k-1=0,1,2,3..c (number of cols). The range of R(i,k-1) depends on maximum and minimum values and MAY also depend on previous values from R(1,k),R(2,k)...R(i-1,k-1) according to the equation. The initial known values are fixed integers (not in a range) for R(1,c), R(2,c),...,R(r,c)
VS 2010 : Return A Row From Datagridview As Array?
Feb 23, 2011I have been having major problems with Datagridviews and attempting to retrieve one row at a time and then assigning that row to an array , Which can be used in another function.I have tried numerous ways to achieve this but none of them seem to work. something like 'Start array of no values to be filled during the while.
dim myArray as Array
While myDataGrid has Rows
assign myArray the values held within the cells of the first row
send myArray to another function for processing
END WHILE
Apply Percentage Format To Custom Cell In Custom Column In DataGridView?
Jun 25, 2009I came across this great article on creating a custom datagridview column which creates a graph-like effect in the cells of a custom datagridview column:[URL]..Does anyone know how you would edit this to format the number in the cell as a percentage? And does anyone know how you would set this up to take 0 values which do not create any graph effects at all.I have been trying to do this but keep getting errors.
View 1 RepliesConvert A TimeSpan Datatype To A DateTime Datatype?
Apr 30, 2002I'm using a 3rd party chart COM object (National Instruments CW graph) to plot data versus elapsed time.The x value needs to be a VB6 equivalent Date type which is a .NET DateTime datatype.What I need is a way to convert a TimeSpan datatype to a DateTime datatype.
Dim testTime as System.DateTime 'date
Dim plotTime as System.DateTime 'date
Dim elapsedTime as System.TimeSpan[code].....
Converting Timespan Datatype To Time Datatype?
Jan 15, 2012I have a database in mysql. The column in table is of datatype time(0)
Similarly I have a control datetimepicker in vb.net I have assigned format property as custom to the control and the CustomFormat property as HH:mm:ss tt so that it can just provide the time. I dont want the date to be in it.
Issue comes when I try to retrieve the value from database I get an error as Converion of type 'Timespan' to type 'Date' is not valid
Try
Dim myCommand As SqlCommand
myCommand = New SqlCommand("select * from [HMS].[dbo].[DoctorSchedule] where DoctorID='" & txtDoctorID.Text & "'", Connection)
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VS 2010 : Creating An Array Of DataGridView Rows?
Aug 31, 2011I'm trying to create an array of DataGridView rows using this
Dim rows As DataGridViewRow() = Nothing
Me.DataGridView1.Rows.CopyTo(rows, 0)
But it gives me this error:
Value cannot be null.Parameter name: dest
VS 2010 Datatype Size On 64-bit Systems?
Jun 17, 2011I'm still using ye ancient 32-bit machine with ye olde XP.Currently I'm writing some code to add binary content to files, and I need to know, if the same code can be applied on 64-bit systems.For example an integer variable added to a binary file with:
BinaryStream.Write(SomeNumberDeclaredAsInteger)
can be safely loaded with
MyInteger = BinaryStream.ReadInt32
on my system, but is this also the case on 64-bit systems or should I truncate it to Int32 before writing it to file?
Changing DataType To An SQL Or Database Datatype?
Jan 2, 2011I am working on a produce inventory database in my VB Express program.I have a form on the bottom and a spreadsheet at the top. I want to enter all the data in the form and have that data automatically transferred as a group to the spreadshet in the upper part of the page when I press a button.I know that there's an insert function.I set it up correctly. The problem is that I have to convert the textbox, which contain string data, to the datatype used in the database spreadsheet.HOw do I use CAST or do this?Here's the function I am using:
Me.TableAdapterManager.InventoryTableAdapter.Insert(IDTextBox.Text, fruitName, unitprice, unitsize, unitIn, unitTransit, unitOut)
Evernything is a string cause the data is coming from a textbox, I need to convert it to the datatypes used in the database.Also how do I use the CAST and Convert functions
VS 2010 Passing A Datatype As A Parameter In A Function?
Jul 16, 2010I am wondering if datatype can be passed as a parameter in a function..
for example..
Private Function CreateDT(ByVal myDT As DataTable, ByVal myColName As String As DataTable
(
myDT.Columns.Add(myColName, GetType(myColDataType))
)
VS 2010 - Hook Mouse Error (DataType Mismatch)
May 21, 2011I'm using code from here - [URL]. And I'm getting the old
A call to PInvoke function 'EliteSwitch!EliteSwitch.MouseHook::CallNextHookEx' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.
Error on this line
Return CallNextHookEx(MouseHook, nCode, wParam, lParam)
I've tried changing variable types but I can't get it.
VS 2010 Uploading A Picture To Mysql Db Using Blob Datatype
Jul 21, 2011its been a while since i was here... it's nice to be back... anyway, i was wondering how to upload a jpeg picture to a blob datatype field in MYSQL. i know i could just put the picture path in a varchar type field and just place the picture somewhere locally and retrieve it programatically. but my project does not require me to do so.
View 2 RepliesVS 2010 Uploading A Picture To Mysql Db Using Blob Datatype?
Jun 1, 2010i've created a pluginframework and i have some problems with it. At first you should know that the framework is only an interface designed like this:
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Create A Custom Class That Has Inside An Array Of Another Custom Class?
Jan 31, 2011I want to create a custom class that has inside an array of another custom class (see my code below) but when the programm runs is crashes. Why? What is the right expression???? Plz help I'm a newbie in VB.net.....
Public Class ctrarray
Public nameclass As String
Public ctrlindex(glvar_spaces) As ctrlindexclass
End Class
[code]....
Perform A Sum Of Individual Column Of 2d Array And Send The Result To 2d Or 1d Array Or Datagridview?
Mar 12, 2012I have a 2d array of data that I have performed the sum of the individual column of the 2d array. I want to send the results to a datagridview and also will like to have the result as a 1d or 2d array.
Below is sample of my code
Dim Array1(,) as double
Array1(0, 0) = 5
Array1(0, 1) = 7
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.net - VB Datagrid + Array With Custom Class?
May 14, 2012I have created a class "student" and made an array which contains students.I would not only like to display the array in a datagridview, but the array should also be updated if the user makes changes to one of the students in the datagridview.
I succeeded in showing the array in the dgv: one way is using datasource prop, the other is doing is diagrammatically. However, i can't find out how to let the user edit the array by editing the dgv.
Custom Class As An Array Of Properties?
Sep 30, 2009I'm moving my first steps in the VB.NET world (I come from VB6) and I'm stuck with the creation of a particular class.
Let's say we have a bus that always has 101 places. I'm trying to create a class containing the map of the bus, along with methods to graphically represent it.
My "Bus" class will have a couple of properties ("BusColor", "BusModel") related to the whole bus. Then it should have a property called "Places" whose type is a custom class thet represents every single place, along with, for example, the passenger name or the place number. This property should of course be an array.
This is my code so far (simplified):
Public Class BusMap
Private Const MAX_PLACES As Integer = 101
Private _BusModel As String = ""
[Code]....
but I wonder if there is a more standard way of doing this.
My second question is: how can I modify my class to be able to iterate its Places property with the "for each" statement? A quick search on the web showed up that I should implement the IEnumerable interface, but I'm still not enough confident with the concept of Interfaces.
Dynamic Array Of Custom Class
Jun 16, 2009I've been programming in VB.net for a while off and on, but never really had a need to use custom classes till now.I built a function in a module to populate a class, The class how ever is supposed to refer to one instance.I need to create an array of this class but the amount of instances needed is not always known.Works fine till the class goes to populate the class array.[code]It's probably something simple, I've just starred at it to long. Keep gettitng "Object reference not set to an instance of an object."
View 1 RepliesSpecify An Inline Array To Custom Attribute?
Oct 4, 2010I would like to know if there's any way to specify an inline array (lets say of strings) to custom attribute on a property in vb.net.
I have the following example that doesn't compile in vb.net (.net 1.1):
Attributes.ManyToOne(New String() {"a", "b", "c"})> _
Public Property PaymentTerms() As PaymentTerms
[Code]....
I get compiler error when I feed the array to the custom attribute in vb.net. I have no problem in C#, just vb.net. What is the correct syntax in this silly language?
Persisting An Array Of Data Using A Custom Control
Oct 12, 2011Does anybody know how to persist (save and recall) a structure array when using a custom control? I don't want this data to show up in the properties window but it needs to be available "behind the scenes".
Right now, I'm writing the information to a file but this causes portability problems and may trigger the UAC.
[code]...
How can I persist this without writing to a file? Should I save it to the registry?