I'm fairly new to WebService development and have just set up my own webservice (ASP.Net 3.5, Visual Studio 2008 .asmx file). I cannot find a way of setting up my webservice to take parameters on the constructor. If I create a constructor that takes parameters, it is not then shown when I hook up to the webservice from my application (it only shows a parameterless constructor).
View 2 RepliesI tried a search, but no luck. Maybe I was using the wrong words, I don't know.Here's my question...called myControl of type CustomControl. I have a property called SomeProperty that can be set in the Properties window. If I put this control on my form and set the property's value to "a string" normally InitializeComponents would look like this:
<System.Diagnostics.DebuggerStepThrough()> _
Private Sub InitializeComponent()
Me.myControl= New CustomControl
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Most of our code base is in VB.NET. I'm developing a project in C# that uses a lot of the assemblies from the VB.NET code.There are three relevant classes in VB.NET:
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I want to create a webservice which returns me 2 parameters in VB.net
redirect URL if the user is authenticated OR Error occured text
I am able to create a webservice which sends only one parameter that is either URL or error msg.
Both are strings.
how to pass above 2 things and retrieve them in application.
I have created a WCF service using vb.net. Everything works fine on my development machine but when I deployed it it failed with the following error'There was an error while trying to deserialize parameter [URL] I call a single method on the service and it has a single parameter called 'querys'. This parameter was a list(Of CustomType). I then created a new method with a single parameter of type ArrayList. Thinking that this should serialize. Again it works fine on my development machine but fails when I deploy it with the same error a above.
I am completely stumped how it can serialize a parameter on one machine and not on another. I've tried it on 2 other machine and it doesn't work on either of them. So that rules out a problem with the machine itself.All machines are running Win XP and .Net v3.5. The service was developed using VB .net in Visual Studio 2008.I have not included any code because the error is happening System.ServiceModel and as I mentioned above the code does work on the development machine.
I have created a webservice in VB.NET
<WebMethod(Description:="This
method will return object Values (in an array of String)for all objects (in an array og String)",
Enablesession:=False)>
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Error 1 Value of type '1-dimensional array of String' cannot be converted to 'TestUse_SEdkVistaWebService.JF_WebService.ArrayOfString'
We did development of a VB application on a machine with a high resolution screen. Also the machine where the real application runs has a high resolution screen. After a while we wanted to do minnor changes on the application and we wanted to use a low resolution laptop for that. When we opened the application for editing we saw that all forms changed their sized automatically AND unwanted.How can we build and change applications in one form size that does not change depending on the resolution of the machine on which edits are made?
View 2 RepliesIn c# you can have
public class Foo
{
public Foo(string name)
{
//do something
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Is there a VB.Net equivalent?
I would like to know if you can have multiple constructors in a VB.NET class? Like in java, you can have multiple constructors as long as they have different parameters, is that possible here?
View 1 RepliesI did not know you could do this. See Article by Dan Mabbutt
'from article - Objects, Parameterized Constructors, Anonymous Types and the With Keyword
'by - Dan Mabbutt
Class someObject
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Coming from more low-level languages like C++, and seeing how transparent .NET memory management is, I've got a concert about a piece a line of code I've written. In C++, every object necessarily (dictated design practices and peculiarities of memory management) needs to have a constructor and a destructor. In .NET, destructors aren't needed as often, and there are different patterns of when they are required and how to use them. My question is this. If I have the following like of code (in VB.NET, but equally applies to C#)
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im converting my classic vb class into vb.net class and im having some problems with my object.Query function
here is my obj.Query Function
Code:
Public Function Query(ByVal sqlStatement As String, Optional ByRef e As String = "") As SqlDataReader
Try
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i've got a class called prob that inherits system.exception however it seems not to have inherited the constructor
Public Class prob
Inherits System.Exception
public sub stuff
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throw new exception("test") 'works Throw New prob("test") 'doesn't work is it possible to inherit the constructor into my class prob as well?
1)When we use Overload constructors in a class
2)and which one is get execut first.
Public Class remoteobj
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I was able to narrow down a problem to a certain point. I was hoping for an explanation or some light shed upon it. I went to Project/Project1/Application/Startup Forms. I found that when I included a "New" constructor in the form I wanted as startup, the form became unavailable for choosing as a startup form. I do not quite understand this because I noticed from work in another document that the form I want (call it StartupForm) actually has a basic "New" construction with no arguments, so that is why I do not understand quite what is happening here.
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Why I am I getting the "type byte has no constructors" error here?
Dim stream As System.IO.MemoryStream = New MemoryStream()
bitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg)
Dim image As Byte() = New Byte(stream.Length
In one of the VB classes I have for a moving object there are 2 Constructors in the code as below:What is the difference between these 2 constructors?what does the first & the second constructor do?
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Public Class Car
Private Dim CarName as String
Private Dim CarWeight as String
Private Dim CarColor as String
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1.) In the book I am reading it says that when the default constructor(i.e. the one with no parameters) is executed all the class level variables get set to default values based on their type automatically by the compiler. For example, all String variables would be set to empty string("") and all Boolean variables would be set to False, etc. If you look at all my constructors you will see that non of them get values passed to them for all my class level variables. So my question is for the class level variables that don't get anything passed to them(ex:CarModel), do they take the same default values as they would if the parameter-less constructor were called?
2.) Following from my question #1, is it good practice to make sure that all the constructors that take parameters make sure they set every class level variable. Should I have written the above code as follows?
Public Class Car
Private Dim CarName as String
Private Dim CarWeight as String
Private Dim CarColor as String
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i've got a Class like this public Class Cart(Of Item) Public Sub New(ByVal a As Integer, ByVal ParamArray items As Item())but i do not see how to create an instance of it: Dim block_names As New Cart(Of String, 5I)i get something like "type expected" o.O
View 2 RepliesWork = New ExampleWork()Here the Work is a withevents variable and I've used the handles clause for handling various events fired by the ExampleWork object. However the event handler will not get assigned till the constructor of the ExampleWork returns. Now how can I handle any events fired from the constructor? I can move the constructor logic out to a separate method and call it after the constructor has returned and thus handle all the fired events including events fired from constructor. However it doesn't look good
View 2 RepliesI would like to open a new form from some other form, and pass some selected object from a control on that form to the new form. The sensible way to do this, I thought, was as a parameter to the forms constructor. Now I know that the visual studio GUI creates partial classes for my forms, that hold the properties that I can drag onto there in the designer. I assume it also holds a default constructor. Since it might do all sorts of stuff that is needed to initialise the form, I figured I should call it from my custom constructor ala
public sub new(byval my_parameter as Foo)
Me.new()
Me.my_parameter = my_parameter
[code].....
That clearly wasn't it, because it can't find a default constructor. The thing is, visual studio goes trough great lengths to prevent me from seeing the generated constructor, so I know how to access it. This leads me to believe that I am actually doing it wrong, and should have set out on some different path, as the path you are forced in to usually is the sensible thing to do, which I usualy find out way too late.
I'm writing a query to select all records that has any part of parameter. I have one table called Employees. Some people have name like this: John David Clark If the parameter is
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I should be able to get result back as long as there's a match in the parameters. If I use Function Contains (q.FirstName & " " & q.LastName).Contains(employeeName), I will not get any result back if employeeName is "John Clark" Function Contains looks only for next words from left to right. It doesn't match a single word at a time. So that's why I used this in the Linq to SQL:
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In my previous application using Linq2SQL I was able to overload constructors with parameters by doing this:
Namespace CoreDb
Partial Public Class Accomplishment
Public Sub New(ByVal accomplishmentTypeID As Object, ByVal description As String, ByVal title As String, ByVal applicableDate As DateTime, ByVal lastUpdatedBy As String)
[code]....
Basically using a partial class off the object, sharing the namespace of the .dbml file and calling the default constructor and then doing additional stuff. So then in my code I could do something like:
Dim accomplishment As New Accomplishment(id, description, title, applicableDate, lastUpdatedBy)
This seems to no longer work in Entity Framework as there is no default constructor to call.Does this no longer work? And if so what is a good alternative to implementing something like this?
I have a class that implements a range of numbers....call it NumericRange(Of T). Internally, NumericRange stores T as a Nullable, T?. I have another class that wraps this class as NumericRange(Of UInt16). Call this class MyNumRange (I'm being simplistic here). So In MyNumRange, I have a few constructors defined:
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What is the difference between a class with protected constructors and a class marked as MustInherit? (I'm programming in VB.Net but it probably equally applies to c#). The reason I ask is because I have an abstract class that I want to convert the constructors to shared/static methods. (To add some constraints). I can't do this because it's not possible to create an instance in the shared function.
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I am getting error [07002] the # binded parameters < the # of parameters makers, i checked both parameters were perfect even though i am getting this error here is my code
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I'm a c# developer and have not enought experience in VB.NET.the scenario:
Namespace Presenters
Public Class BaseFooPresenter
assuming the public default parameterless constructor[code]....
I can create a method SetValues( ... parameters ... ) and call it from the two constructors but does someone knwos a workaround to avoid this error?, why the compiler do not validate the possibility to call the base constructor before the overloaded constructor?how to justify logically the fact that it's not possible to call the base class constructor and another class level constructor from one class level constructor at the same time?
Dim regkey As New RegistryKey
i get this error: type microsoft.win32.registrykey has no constructors
I just wanted to try something I had in mind,
Code:
Dim mTreeNodeCollection As TreeNodeCollection
mTreeNodeCollection.Add(New TreeNode("ddsf"))
above produces a 'System.NullReferenceException was unhandled' which is fine.
So I thought dam I forgot to initialise it!!
Code:
Dim mTreeNodeCollection As New TreeNodeCollection
mTreeNodeCollection.Add(New TreeNode("ddsf"))
Now it does not run but i get
Quote:
Type 'Sytem.Windows.Forms.TreeViewCollection' has no constructors
so how the hell I'm I going to get it to work?? can I only Add to a TreeNode collection , a TreeView?
I have defined a class with multiple constructors so that the underlying interfaces are immutable once the object is instantiated. I would like one of the constructors to be the "default" constructor for when a user types the following in Visual Studio:
var obj = new MyClass( Dim obj As New MyClass(
Currently when I go to instantiate the object, the constructors aren't listed (in Visual Studio IntelliSense) in the order I declared them in my class. Is there a way to mark up my constructors so that their methods appear in a particular order during instantiation in Visual Studio IntelliSense?