Has Object In VB 2010 Received The Same Optimalization As Dynamic In C# 4.0?
Apr 13, 2010
Some people have argued that the C# 4.0 feature introduced with the dynamic keyword is the same as the "everything is an Object" feature of VB. However, any call on a dynamic variable will be translated into a delegate once and from then on, the delegate will be called. In VB, when using Object, no caching is applied and each call on a non-typed method involves a whole lot of under-the-hood reflection, sometimes totaling a whopping 400-fold performance penalty.
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Feb 2, 2011
I`m bussy building a ORM for our applications.I don`t want to use all of microsoft data functions like ADO.NET and Datasets because i would like to understande the base and manipulate data by code. I also want to make it later work like building a database out of the code in stead of the other way around.
I have build a simple appliacation inside VB.NET with a dataset and ADO.NET Entity.. When loading 250.000 records into objects it takes about 4.5 second. I`m using datareader to load a record of a database into a object dynamicly. I started at 15 seconds,later 8 and nu 6.5 seconds for the total amount of records.I started with TmpObject.ColumnName = Reader ("ColumnName"), later i figured out Reader.GetValues(TmpObjectArray) in combination with TmpObject.ColumnName = TmpObjectArray(0) is faster. Now i tought if i can set the properties as pointer to a object array so the values are placed onto the object instead of on a different object before it could be faster.
' PropertyArray
Dim tPropertyArray()
As PropertyInfo = tProperties.Values.ToArray[code]......
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Nov 12, 2009
I'm not having any errors from these pieces of code, they're just empty everytime. I'm wondering if I perhaps have created them incorrectly.
Dim l As New Log()
l.Log = "Attempted staff login with username [" & txtUsername.Text & "]"
l.LogId = 0
l.StaffId = 4
l.LogDate = Date.Now()
l.Insert()
.Insert() is picked up in my BLL layer by these two functions;
[Code] ......
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Jul 20, 2009
I want to build a MVC helper function for which I pass a Entity Framework object and have it build a select. Generally speaking I tried something like this:
Public Function RenderSelect(ByVal helper As HtmlHelper, ByVal sSelectName As String, ByVal aItmes As Array, Optional ByVal sTitleKeyName As String = "name", Optional ByVal sValueKeyName As String = "id") As String
' open select
[Code].....
However, it isn't working. It would be great to have a way to do this and pass the current entity object.
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Oct 26, 2010
Dynamic Object Properties in a MVC Helper on a Entity Framework object
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Feb 29, 2012
Basically i have one TabControl with a form and 2 browsers within one form I have ProBlem To call the dynamic browser to navigate with dynamic Textbox.text
[Code]...
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Dec 20, 2011
I write in VB2010, the software should work with the external hardware via RS232, the thing is when I send a command to the external hardware I have to wait for a reply from the device that command was received, just after I got the answer I want to continue send another command, I have a long sequence of commands i'm supposed to send, but I need to know for sure that the commands were received before I go on to the next command. I did the following code, but I think the code is not effective, because sometimes I do not get an answer and then the whole sequence commands destroyed. Maybe you can help me optimize the code? [Code]
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Apr 25, 2012
how to convert received string to double.
I'm receiving string as 420.8 280.9 140.2 like this from serial port.. and transferred it into textbox..
I'm using following code to split string and to convert to double
Dim ReceivedText As String
ReceivedText = txtReceived.Text
Dim str_RY_1U, str_RY_1V, str_RY_1W As String
[Code]...
For calculating percentage RY_R is calculating fine.. But when it comes to RY_Y it showing error "string not in a correct format..."
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Oct 22, 2010
I have written a simple Server application that transmits an XML string to all connected clients when the user updates/alters a datagridview. When I connect to this server with telnet I can see the correctly formed xml string.
I have also written a client application, which on reception of the Xml string, displays it in a datagridview. But When I look at the xml string it is either missing parts of in the wrong sequence.
[Code]...
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Dec 16, 2011
We are migrating an application from C# to VB to meet our project's needs but stumbled upon a problem with event handling in VB.
The application uses a COM Wrapper access a scanner in Silverlight. The object is created dynamically in the code, and an event is added to "AcquirePage". This requires elevated trust of course.
Code in C#:
dynamic TwainSession;
(...)
TwainSession.AcquirePage += new AcquirePageDelegate(AcquirePageEventHandler);
As the only real "equivalent" of dynamic in VB is Object, we use:
Private TwainSession As Object
Everything is fine up to the point we want to handle an event of this Object. Because we are in Silverlight, we cannot have knowledge of the Object's structure or events, hence the need to create it dynamically. In C# we simply use "+=" to add a handler to an event but:
AddHandler TwainSession.AcquirePage, AddressOf AcquirePageEventHandler
In VB gives: 'AcquirePage' is not an event of 'Object'
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Jul 9, 2009
I am trying to get the hang of Dynamic loading of objects from assemblies on the same machine (But NOT part of the same project).In the sample below, Form1 implements an interface built as part of the .dll I placed in C:Release. I am trying to create a local instance of Form1, and Cast it as Iform, so that the local code can access the properties and methods exposed by the interface.The assumption here is that at runtime, local code will have access to the String name of a form, and an interface which is implemented by the form (and is compiled into the .dll as well as the client application), and that is it.
When I run this code, I get a exception: "Unable to cast object of type 'WindowsApplication1.Form1' to type 'WindowsApplication1.Iform'.
Public Function fApplicationObject() As Iform
Dim sLocation As String = "C:ReleaseWindowsApplication1.dll"
Dim sType As String = "WindowsApplication1.Form1"
[code]....
I seem unable to dynamically load an object from a dll and then utilize an interface to access it's properties and such.
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Jun 3, 2009
I have some code to create dynamic serial port objects, now Im trying to add an event handler to the object so I can capture the dataReceived event. But the vb designer is saying ".datareceived" is not en event of 'object' in this case serialports(dComPortNum)
Public serialports(5) As Object
dComPortNum=1
serialports(dComPortNum) = New SerialPort
[code]....
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Feb 13, 2012
How to create an aspx page with a Flash object inside? And how to change the content of the Flash object?[code]...
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Feb 3, 2011
Is there any way to create an XmlSerializer that stores along with the serialized data the data type, then when deserializing, it automatically identifies the type of the serialized object and creates an object of that type (returned as object).
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Aug 11, 2010
I currently have a XML file for an application I am developing. I have built a a XMLFile.GetContent function to read my XML File and load the content into a set of specific objects. These objects are then added to a collection and passed back to the main code to be loaded into the memory of the application.I am looking for a dynamic way of loading the information from the XML file into a specific Object Property. I have added comments to the function to show what I want to make dynamic.Content of XML File
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Config>
<IQSDataSources>[code].....
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Jun 29, 2009
I have the following code to create an array of serial ports.
[Code]...
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Jan 7, 2010
In a ASP.NET app from a procedure IN a VB code file a dynamic control is called. The first problem may solve the second. In the following line of code I am getting an "end of statement expected" error at the following line.
[Code]....
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Feb 8, 2011
I want to learn how to rotate an object by direction and speed and also how to move an object using the arrow keys?
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Jan 18, 2011
I'm using the following code to try and search a listview (I got it from msdn):
Dim atem As New ListViewItem = ListView1.FindItemWithText(TextBox2.Text, True, 0, True)
If atem IsNot Nothing Then
ListView1.TopItem = atem
End If
Then I got the " Object reference not set to an instance of an object" error highlighting the following line: ListView1.TopItem = atem So then I tried this:
Dim atem As New ListViewItem atem = ListView1.FindItemWithText(TextBox2.Text, True, 0, True)
If atem IsNot Nothing Then ListView1.TopItem = atem End If it still isn't working.
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Oct 16, 2011
I am struggling with the following - I try to add a value to a list, where the list is defined in a structure.
[Code]...
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Jun 22, 2012
I get error (Object reference not set to an instance of an object)trying to read a reg key, it stops after the first msgBox which shows MyRegKey value it shows a blank value
Dim MyReg As Microsoft.Win32.RegistryKey = Microsoft.Win32.RegistryKey.OpenRemoteBaseKey(Microsoft.Win32.RegistryHive.CurrentUser, (OldPCTxtBx.Text))
Dim MyRegKey As Microsoft.Win32.RegistryKey
[code]...
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Nov 18, 2011
I have a treeview with a contextmenu. I'm trying to disbable specific items in the contextmenu when the user doesn't have a node clicked, but each try gives me the same error: "Object reference not set to an instance of an object."I tried several methods in the Mouse_Down-event (IsSelected, etc), this was my last:
If .Nodes.Count > 0 Then
If .SelectedNode.Text <> "" Then ' <<< this line is highlighted
enable_expl_mnu() ' enable the contextmenu
[code]....
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Jul 9, 2010
I get the error, Object reference not set to an instance of an object., on:
vb
For Each comboItem As String In My.Settings.ComboBox1
That code is in:
vb
Private Sub Me_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Me.Load
For Each comboItem As String In My.Settings.ComboBox1
[code]....
I am trying to get it to load those settings when the program loads up, VS does not report that program till i attempt to run in debug. Before the program is even loaded that happens.
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Jun 27, 2011
Hey guys, I am trying to send data from client to server (encrypted) and the string sent from the client is not the same as recieved from the server. I've been killing my brain for hours to get this to work but I cant manage. Im converting everything to Base64 string.
Client:
Public Sub SendMessage(ByVal msg As String)
Try
SyncLock myclient.GetStream
sw = New IO.StreamWriter(myclient.GetStream)
[code]....
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Feb 19, 2011
I have a treeview on 1 form which is populated from information from another form.
I have the following code.
Module treeviewReport
Dim myRootNode As New TreeNode
Dim myParentNode As New TreeNode
'This is the Main Root Node which is created before any others are.
Public Function addRootNode(ByVal rootNodeName As String)
[Code]...
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Mar 14, 2012
I've created two Forms of which second one is opened with ButtonClick event with statement: Form2.Show(). Everything worked great until I declared some variables directly under Public Class Form2 (actually they are inputs in TextBoxes of a user which are placed on Form2). Error is: InvalidOperationException was unhandled - Object reference not set to an instance of an object.
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Jan 4, 2012
i got a html to pdf conversion source using the opensource itextsharp library from the[URL]..I copied the code exactly in vb.net 2010 after referencing the library and it gives the 'Object reference not set to an instance of an object' error in the bold line... couldnt find a solution to it..
[Code]...
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Jan 31, 2011
I am successfully able to pull images into a picturebox in my program and manipulate them in a variety of ways. What i need to be able to do is the following.
1) Pull images into a picture box on my main form and dynamically resize either the picture box or the image so that the image doesnt lose its scale when it comes in
2) Have a method of pre-screening an image to be loaded before it comes in so that i can change its size without losing scale .. ex.
if my image is 1200x1200 i do not have that much room on my form so i would want to say something like
if getimagewidth()>600 then
me.picturebox.width = getimagewidth()/2
end if
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Jan 20, 2012
I'm looking for a way to create PDF with dynamic content. When you google for it, you get 1000 hits on how to dynamicly create PDF's, but thats not what I mean.
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Aug 18, 2011
I am looking at creating a Dynamic Menustrip.I have managed to write the code to add subItems to a Item. The root item is called item1 and when the form is run, item1 gets populated by items called subItem[0-5].I am wondering how do I assign an action to a subItem when click? At the moment I want a message box to popup with the subItem's name that has been clicked. I.E If subItem3 is clicked, I want a msgbox to pop up with "subItem3".
code
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
For j As Integer = 0 To 4
Dim subItem As String = String.Format("subItem{0}", j.ToString())
[code]....
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