Converting List(Of ConcreteClass) To List(Of T)
Aug 10, 2011
The following code snippet is taken from Julie Lerman's, "Programming Entity Framework" 2nd edition on page 765. The code is in C#, and I don't normally have a problem manually converting C# to VB, but I can't figure this one out.
_activities is a List(Of Activity). Using VB, how would you convert a List(Of Activity) to a List(Of T) as in this code sample? The compiler doesn't like anything that I've tried thus far.
private List<T> GetStoredList<T>()
{
string typeName = typeof(T).Name;
List<T> list;
[CODE]...
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Aug 3, 2010
I'm trying to convert an object, that is a list of something, to that list, but I'm having problems figuring out exactly how to do that. I have created the following code:
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim a As New List(Of String)
[Code]....
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May 2, 2011
I have a checked list box with lots of values and i need it so that when one of the items is ticked that a different box will display a value ie 50 so for instance i think it would be along the lines of
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Jun 11, 2010
Ok I have been working on a little project and it involves a list box.I want to be able to get all the text from the list box and set it as a String or somehow put it all in a text box (which will be set invisible).I tried using a text box before I started using the list box but it just wont work and all the buttond on my form stop working all together.
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Jun 2, 2011
This has to be incredibly simple, but I must not be looking in the right place.
I'm receiving this string via a FTDI usb connection:
'UUU'
I would like to receive this as a byte array of
[85,85,85]
In Python, this I would convert a string to a byte array like this: [ord(c) for c in 'UUU']
I've looked around, but haven't figured this out. How do I do this in Visual Basic?
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Nov 22, 2009
I have a function that works great in C# that I'm converting to VB.Net. I'm having an issue converting the result set to a generic list in VB.net.
The code:
Public Function GetCategories() As List(Of Category)
Dim xmlDoc As XDocument = XDocument.Load("http://my_xml_api_url.com")
Dim categories = (From category In xmlDoc.Descendants("Table") _
Select New Category()).ToList(Of Category)()
Return categories
End Function
The error occurs when convertng the result via .ToList(Of Category)() The error:
Public Function ToList() As System.Collections.Generic.List(Of TSource)' defined in 'System.Linq.Enumerable' is not generic (or has no free type parameters) and so cannot have type arguments.
Category is a simple object I've created, stored in the App_Code directory.
I have the necessary "Imports System.Collections.Generic" reference in the file so I don't see why I can't convert the result set to a generic list.
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Mar 8, 2011
I have a generic List(Of Customer). The customer class has a name, address, and phone number properties. I also have a property of another class that accepts a customer name array. I am able to do this by doing the following:
Dim names As String()
Dim i As Integer = 0
'customer.GetCustomers is a List(of Customer)
[Code]....
Is there a better way to convert this to a string array?
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Sep 7, 2011
I want to loop through all the items in the items, but first I must to cast to appropriate type which I fail. [code]
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Jan 21, 2009
Option Explicit
Private Declare Function SQLAllocEnv Lib "odbc32.dll" (phenv As Long) As Integer
Private Declare Function SQLFreeEnv Lib "odbc32.dll" (ByVal hEnv As Long) As Integer
Private Declare Function SQLDataSources Lib "odbc32.dll" _
(ByVal hEnv As Long, ByVal fDirection As Integer, ByVal szDSN As String, _
[code].....
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May 21, 2010
I am trying to avoid every single function affecting my response time.therefore my question is using ToArray while converting generic list to array, does this take significant response time?should I use array directly while building my array within for each or working with list of and then at the endusing ToArray? any difference?
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Jun 23, 2009
I am currently writing unit tests for an application near completion (before management looks at it and turns it inside out). I am testing the business layer and a method is set to return a datatable of all "GroupID"s, which are simply an integer to represent the group that a user belongs to.
I'm assuming the best way to assert on this unit test would be to assert that the correct groupIDs are being returned from a controlled test database. However, I'm not sure how to assert on a datatable. Is the only (and best) possible way to accomplish this to simply loop through the datatable until it's empty and add each value to an array of integers? How would one go about asserting on this test?
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Aug 6, 2010
I have a Generic.List(Of ImportedVehicle) - ImportedVehicle being a simple class as below.There is an enum property which is marked as public.When I serialize to XML using an XMLSerializer, the enum's value is just set to it's default value (which is NotAllocated) and doesn't actually represent the value that is set in code.[code]
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Mar 14, 2012
in my application, I am pulling in items from a microsoft project file using mpxj - one of the items I need is the predecessors. The way I am able to pull the predecessor is using a build in function of mpxj which returns a type of java.util.list - I can save this to variable as an object, but I need to find a way to bring the data to a format I can easily use so I can store it into a database. Listed below is the line of code I am using to pull the predecessors from the project file.
Dim predecessors = task.getPredecessors
and here is the result when putting a tracepoint in to get the value of predecessors
[[Relation [Task id=4 uniqueID=45577 name=Standards Training - Round 2] -> [Task id=3 uniqueID=45576 name=Process Excellence Training]]]
Even if I could get the above as a string, I could work with it enough to get the data I need. The above example is where there is 1 item in the predecessor list, but sometimes there are multiple items. Here is an example of the tracepoint when there are multiple items.
[[Relation [Task id=63 uniqueID=45873 name=Complete IP Binder] -> [Task id=47 uniqueID=45857 name=Organizational Assessment]], [Relation [Task id=63 uniqueID=45873 name=Complete IP Binder] -> [Task id=49 uniqueID=45859 name=Document Deliverables]], [Relation [Task id=63 uniqueID=45873 name=Complete IP Binder] -> [Task id=56 uniqueID=45866 name=Infrastructure Deliverables]], [Relation [Task id=63 uniqueID=45873 name=Complete IP Binder] -> [Task id=58 uniqueID=45868 name=IT Deliverables]], [Relation [Task id=63 uniqueID=45873 name=Complete IP Binder] -> [Task id=60 uniqueID=45870 name=Organizational Deliverables]]]
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May 14, 2009
II am trying to create a toggle button that switches a list to a range and then back to a list if needed. I am able to get it to do both but when I add an item to the list, convert to a range and then convert back to a list it leaves off the last items I entered.I tried to work in a code to select all cells but I must not be putting it in the right place.This is what I have so far:
ActiveSheet.ListObjects.Add(xlSrcRange, Range("$A$3:$AE$7"), , xlYes).Name = _
"List1"
I realize the problem is the $AE$7 (the $A$3 is correct)
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Oct 27, 2009
In VS 2008, VB.Net, I am successful connecting to a local SQL Server (version 8) and seeing all tables/views/procedures in Server Explorer. The local OS is Win XP Pro SP3. I created an ODBC data source to a remote SQL server (also version 8) with a database of the same structure as the local one. The connection tests out ok. The remote computer runs Windows Server 2000 SP4. In the VS 2008 Server Explorer I add this ODBC source. When I click on the plus-signs to expand items, neither the tables nor the views show anything, whereas the full list of procedures appears. Is it the old SQL Server version? Is it the old Server OS version? Something else alltogether?
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Dec 30, 2010
This is what I'm sure will be the first of many noob-ish questions from yours truly... I'm studying as a mature student for a Computing Degree (encompassing web design, hardware, programming and systems analysis). The programming seems to be my weak spot this year. I enjoyed C++ last year, doing basic console applications, but progamming visually with VB in Visual Studio 2008 I'm struggling!
[Code].....
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Oct 16, 2009
Does link text mean I have to return a concrete implementation? Even though I am using svcutil with the /r that includes my entites(where IMyInterface is defined). I get no errors but it changes all List(of IMyInterface) to list(of Object) and I cannot deserialize it on the client
Error: list(of object) cannot be converted to list(of IMyInterface).
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Oct 1, 2009
I'm looping all the properties in an object via reflection:
For Each p As PropertyInfo In values.[GetType]().GetProperties()
If p.CanRead Then
'Do stuff
End If
Next
how to determine whether the property in question is a generic List(Of T)? If it is I need to loop the list itself.
I've experimented with GetType and TypeOf but have not managed to get anything working.
To clarify, I want to keep this generic. I do not want to specify the type of T, I need to loop the list items and call the ToString method on each item. T could be one of a number of different types (application specific reference types). Is it possible to do this without specifying types?
(VB.NET 2005 with .Net 2.0)
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Nov 18, 2009
If I can generate a list of random integer with a click of the button and put the results in a list box using VB.Net but how do I randomly change several integer number generated by button 1 by clicking button 2? How I retain the results of button1 and change the results when clicking button2?I try before but the two button function code cannot relate to one another.
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Mar 23, 2011
Public Class notifierMain
Public Class Contacts
Inherits List(Of row)
Public Sub New()
[code]....
When I debug this winforms application I get curType = "notifier.notifierMain+Contacts+row" I want to the Validate function to know it is in MyContacts. How do I do this?
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Oct 27, 2009
In VS 2008, VB.Net, I am successful connecting to a local SQL Server and seeing all tables/views/procedures.I created an ODBC data source to a remote SQL server with a database of the same structure as the local one.The connection tests out ok. In the VS 2008 Server Explorer I add this source. When I click on the plus-signs to expand items, neither the tables nor the views show anything, whereas the full list of procedures appears.How can I see the lists of tables and views in Server Explorer for an ODBC source?
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Nov 5, 2011
I wish to make a project where a teacher views a list box with a list of students of a class. When he selects a name from the first list box the second listbox would change its data to show the grades for that one student.
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Apr 12, 2010
I have implemented inheritance for two parent classes called Table and Field. Each parent class has several child classes. In the Table parent class, I created a method that expects parameter List(Of Field).
I get an error when trying to pass in parameter List(Of ChildField) to the method that expects a parameter of List(Of Field). The error message is as below:
Value of type
'System.Collections.Generic.List(Of
com.hlb.icisbatch.data.ChildField)'
[Code]....
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Mar 16, 2011
This program is supposed to allow the user to check items in a checked list box. If the item is checked, it goes into the Completed List Box on the right. The program then adds the unchecked items to the Pending list box on the left. I keep getting placement values (e.g. O,1,2) instead of the strings (e.g. "Key Returned") in the list box results (see photo attached)
Public Class frmCheckOut
Dim i As Integer
Dim cleaning As String = "Cleaning Inspection"
Dim damage As String = "Damage Repaired"
[code].....
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May 16, 2011
Another program I am working on for fun, I am basically shuffling a list inside a listbox, what I want to do is delete the rest but not sure how to go through with that. At the moment I have this: [code] Just contains the code, declarations outside weren't included.So anyway, once clicked, it will call on the function to basically shuffle in a for loop, I was wondering if I should (or how should) create another function and call it in the click button or have just a loop in the click button so it deletes half the list. What I am doing is I have 20 list of items, I want the program to shuffle the items and then deleting the lower 10, meaning, if I had 10 items and wanted 5 top, I'd want: 0, 1, 2, 3, 4 and deleting 5, 6, 7, 8, 9.
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Aug 1, 2009
I currently have a list of words in a text file sorted in to alphabetical order and put into lower case, but I would like to be able to also display the line numbers on which these words are associated with.. but only one instance of.
For example,
"This is a random text
file that I
have just made
up this second"
[Code].....
As you can see above, I would like to show that "this" for example appears on line 1 and 4. Hopefully tabbed so that it keeps a nice look to it.
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Sep 21, 2010
I think (?) this is about object design, and perhaps about structural and/or creational patterns. But a bit hard to say when I only know a couple of patterns yet.[code]But... what if we INSTEAD want each Product instance only to (in some way) refer to one instance of a specific list of Components. So we wan't to save the products list to one file, and the components list to another file. Then would I build the objects the same way, or different? So let's then say we have now Class B as below. [code]
1. Will not need to update each component variable of the products list when the components list changes.
2. If the Product object shall be shown in a DataGridView, for editing properties, it seems easier to implement the selection of the component property.
Is this wrong approach? Is it suitable in some cases, and if so, when? Are there other solutions I perhaps am not aware of that would be appropriate? Is this about structural design patterns? and if so, can the alternatives above be catagorized to some pattern type? I don't really know exactly what I'm looking for.. But I think probably I'm looking to understand whether the object design will be determined by the way the objects are saved.. And if i shall save the objects by serializing to file, vs saving to a database, would I create the business objects differently?
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Jan 27, 2011
I'm getting System.NullReferenceException error when I try to add the employee info to the Employees list.
[Code]...
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Jan 27, 2011
I have a small problem i'm trying to fetch list of directoies from 1 special ftp server wich does not support LIST command i was try this code and it works for all ftp server i have try exept this special one :
'' Get the object used to communicate with the server.
'Dim request As FtpWebRequest = DirectCast(WebRequest.Create("ftp://" & txtFTPhost.Text), FtpWebRequest)
[code]...
I'm getting error 502 which means command is not supported and app crashed. I would just simple said leave it but i have try normal ftp clients like FlashFXp and it works just fine (i can see error in the log but it just pass it and show direcoties)
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May 3, 2012
i have issue returning a list in a web method. here is the code
<WebMethod()> _
Public Function getTags(para_parents As String) As List(Of getTypeDetailsByParentName_Result)()
Dim context As New PPEntities
[code]....
the error is
Value of type 'System.Collections.Generic.List(Of SaftyonRoad.getTypeDetailsByParentName_Result)' cannot be converted to '1-dimensional array of System.Collections.Generic.List(Of SaftyonRoad.getTypeDetailsByParentName_Result)'
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