Class - Automatically Initialize Extended Property Of Type Object?

Jun 5, 2006

I am building a code behind page that has a public property (MyDTOItem) which is essentially a DTO object (dtDTOItem) Note: In my code the Get and Set are actually real code (I stripped it for the example).

The problem I am having is in the Page_Load event. When I set the .Member1 property of the DTO object the Get code runs and not the Set and therefore the DTO ibject property .Member1 never gets assigned.

I figured out that if I add code (MyDTOItem = New dtDTOItem) to the Page_Load event then it will set the value correctly. What I am trying to figure out is how to initialize the property object without having to do it explicitly. It has to be an extended property because I have custom Get and Set code.

Public Property MyDTOItem As dtDTOItem
Get
End Get

[code]....

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Class - .NET - Automatically Initialize Extended Property Of Type Object?

Feb 15, 2012

I am building a code behind page that has a public property (MyDTOItem) which is essentially a DTO object (dtDTOItem) Note: In my code the Get and Set are actually real code (I stripped it for the example).The problem I am having is in the Page_Load event. When I set the .Member1 property of the DTO object the Get code runs and not the Set and therefore the DTO ibject property .Member1 never gets assigned. I figured out that if I add code (MyDTOItem = New dtDTOItem) to the Page_Load event then it will set the value correctly. What I am trying to figure out is how to initialize the property object without having to do it explicitly. It has to be an extended property because I have custom Get and Set code.

Public Property MyDTOItem As dtDTOItem
Get
End Get
Set(value As dtDTOItem)

[code]....

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C# - Initialize The Variables - Name Property Of The Dings Class To Be Initialized At First?

Jan 27, 2011

I have classes similar the following:

[Code]...

I want the Name property of the Dings class to be initialised at first, I know, I could also create the foo-object (as member of dings) later in the constructor. But I want to have it this way, because in the end there are very much singleton objects instantiated in the Dings-class that I want to be created in only one line.

[Code]...

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Automatically Change Text Property Of An Object?

Feb 13, 2010

How do I transfer the value of a variable and place it into the text property of an object on form load?

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Get A Property Name For A Type Without The Need To Instantiate An Object Of That Type?

May 15, 2012

I have a requirement where I need to have a "type safe" way of accessing property names, without actually instantiating an object to get to the property. To give an example, consider a method that takes as arguments a list of IMyObject and a string that represents a property name (a property that exists in IMyObject).

The methods implementation will take the list and access all the objects in the list using the property name passed... for some reason or another, we won't dwell on that!!

Now, I know that you can do this using an instantiated object, something like ...

Dim x as MyObject = nothing
Dim prop As PropertyInfo = PropHelper.GetProperty(Of MyObject)(Function() x.MyProperty)

Where my helper method uses reflection to get the name of the property as a string - there are numerous examples of this flying around on the web!

But I don't want to have to create this pointless object, I just want to do something like MyObject.MyProperty! Reflection allows you to iterate through a types properties and methods without declaring an object of that type... but I want to access a specific property and retrieve the string version of its name without iteration and without declaring an object of that type!

The main point here is that although I am trying to get the property name as a string... this is done at run time... at compile time, I want this to be type safe so if someone changes the property name, the compilation will break.

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Unable To Cast COM Object Of Type 'System.__ComObject' To Class Type?

May 14, 2009

Unable to cast COM object of type 'System.__ComObject' to class type 'rjsDocMan.Folder'.Instances of types that represent COM components cannot be cast to types that do not represent COM components; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface.The code where it is flagging the error is:

<div style="color: Black; background-color: White;">
treeview += AddChildren(Session("DocMan").RootFolder)
</div>

[code].....

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Type Conversion From Webservice Object To Class Object?

Jun 15, 2009

i've created bunch of classes. i have webservices which reference these classes and contains the classes as parameters and return objects.when i call the weservice, i have to convert the class to the webservice object else i can type conversion error.is there a generic way to convert between these types without having to assign the values by hand?

for example

public class person
fname as string
lname as string
end class

[code]....

i would liek ot be able to call the web service and return the data type back and have a generic coversion instead of as above in stead of:

dim wsPerson as wsReference.Person = ws.getperson()

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Class Property Specifying An Object?

Mar 9, 2012

I'm currently writing a HMI for an automated machine in VB.Net 2010. I have a custom class that turns a Border green or red depending on the value of an input on a remote I/O module.

The connection to the remote I/O module is through a COM object provided by the manufacturer. I have three remote connections, lets' call them g1, g2, and g3. They're of type Manufacturer.ConnectionObject.

I would like to specify, using a property that I can set in XAML, that instances of MyCustomBorder use g1, g2, or g3. Unfortunately, setting up a Property called g and typing 'g1' into the property field results in the message "Property value is not valid. Details: Property 'g' does not support String to Value conversion."

[code...]

I need to implement a converter between String and the custom class, Manufacturer.ConnectionObject, but I have no idea how to accomplish this, especially since Manufacturer.ConnectionObject is part of a closed-to-me COM object.

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Data Type As A Class Property?

Dec 16, 2011

I have a "generic" Tag class which holds an ItemValue, which at this time is declared as Object. The ItemValue could be one of several datatypes; String, Boolean, Integer, etc. Is there a way to create a class property to identify which data type the Tag is?

I've tried this but it's not working;

Public Property DataType As Type
Get
Return m_DataType

[code]....

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C# - Create An Extended (custom) Property With EWS?

Aug 17, 2010

I have created a little demo application which is able to create a meeting request by using the Exchange WebService (EWS). I would also like to add some custom properties to this item but up to now I have only found examples which use the Exchange Managed API, which I won't use. There must be a way to create these properties by only using EWS... Does anybody know how and can provide a little code example?

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Extended Webbrowsers Document Property?

Apr 29, 2010

how can i add a method to my extended webbrowsers Document property?

i.e.

webbrowser1.document.[myMethod]

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Add A Method To Extended Webbrowsers Document Property?

Mar 18, 2010

how can i add a method to my extended webbrowsers Document property?

[Code]...

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"upgrade" An Object To An Inherited Class, And Keep All The Base Class's Property Values?

Jul 5, 2010

bare with me during this silly example. :-) Let's say I have a class like this:

Public Class Animal
Public iLegs as int32 ' Number of legs
Public bWings as Boolean ' Wings? Yes/No
End Class

And another class that inherits the "Animal" class and adds one more property:

Public Class ScaryAnimal
Inherits Animal
Public iScariness as int32 ' 0-100, how scary is it?
End Class

Now, if I have an instance of "Animal" with some values in it, and I decide I want to cast it to a ScaryAnimal for some reason, how do I do that without having to create a new instance of "ScaryAnimal" and copy each property value?Basically I'm looking for a way to do this, without having to write the lines marked with '*** below:

[Code]...

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Get Value From Property Member Of A Class As Generic Object?

May 29, 2010

I have a routine that accepts a List of Objects, a property name and a value to search for and simply returns whether or not it found it.The code I have hangs up at the For loop in the findit routine.[code]

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.net - Getting Base Field Type When Databinding To A Decimal (or Object) Property?

May 28, 2012

I've got a custom NumericEditor control that has a nullable Decimal property called Value. When I bind a data field to Value, I'd like to retrieve the underlying Type of the data that's bound, so that I can restrict the use of decimal places if the source field is an integral data type.I figure I'd have to do this in the BindingContextChanged event, but how do I get the Type of the data field from the binding itself? My Google-Fu is failing me at the moment.

In short, I'm looking for something like the GetValueType method mentioned in the following question: Simple databinding - How to handle bound field/property change. Winforms, .Net I imagine this method would also be handy if the Value property was an Object.

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C# - Serializing A Dataset To A Strongly Type Business Object Property?

Nov 14, 2009

In a vb .net winforms app I am trying out something for "wide and shallow" children of a record. I use strongly typed business objects ( Strataframe ).My plan is to have a number of "child tables" collected in a dataset I drop on the form. they have no correspondence in persisted data, so the dataset is untyped and I am creating the schema through the property sheet for the tables. Each table is the datasource for a datagridview in the interface.

In my proof of concept sample, My main businessobject (CustomerBO) interacts with a SQL Server 2008 table with fields - pk, name, - and a third column which is currently varchar(max) as I considered XML but could just as easily be varbinary(max) if that works better for holding the serialized dataset.

bo.bigfield will be the strongly typed prop I want to hold the byte() array or XML or whatever that represents the dataset for that record.So, the question in a nutshell - how do I convert a dataset to a single datum and reproduce the dataset from that datum. This is my first foray into datasets, datagridviews as well so if there are better ways to accomplish any of that I'm listening.

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Unable To Cast COM Object Of Type 'System.__ComObject' To Class Type 'System.Xml.XmlNode'

Jul 30, 2009

Code: Dim dom As New DOMDocument30 dom.async = False
dom.Load(serverAddress & "/App/filelist.jsp?type=content")
For i = 0 To dom.childNodes.item(1).childNodes.length - 1 downloadfile(dom.childNodes.item(i), mcount, currentpath) Next

The above code is activated upon clicking of a button. i have the server address declared. and using the domdoc to load the jsp file to generate the xml data. and using for loop, i call the download file function which accepts the following parameters

Code:Public Sub downloadfile(ByVal domdoc As Xml.XmlNode, ByVal totalcount As Integer, ByVal currentpath As String)

The totalcount and currentpath work fine, but when i pass in the dom.childNodes.item(i) , error pops up.

--------------------error message------------------------------------------Unable to cast COM object of type 'System.__ComObject' to class type 'System.Xml.XmlNode'. Instances of types that represent COM components cannot be cast to types that do not represent COM components; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface.-------------------------------------------------------------------------------

[code]....

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Create A User Control With A List Of Custom Class Type Property

Nov 29, 2011

Is it possible to create a user control with a list of custom class type property? If it is, how can I? The issue is that, in designer mode the property is not displayed in property window. I can add the list on markup but when i switch to the designer mode it gives an error which is 'The user control does not have a public property named BookList'.

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Check Whether An Object Is Of A Particular Class Type?

Jul 16, 2009

I am trying to check whether an object is of a particular class type, or if it derives from a particular class type. I've tried to do this muliple ways. But have not had much success. I am using VB.NET.

Here is the code that am using:

If Me.Page.GetType() Is GetType(AALASWebsite.ContentPage) Then
hlPrintPage.Visible = False
End If

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Get Type Of Class Without Initiating Object?

Jan 20, 2011

The consturctor of System.Xml.Serialization.XmlSerial need the type of the class I want to serialize.[code]...

No problem. But how can I get the type of AnyClass without initiating?

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Pass An Object Type To A Class?

Jun 18, 2009

I create a object type entity in the main function and would like to pass it to a separate class, do some calculation, and then pass the result back to the main function. But I keep getting errors, can someone point me where I did wrong? It's in windows application[code]...

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.net - Serializing An Extended Form Object?

Jun 2, 2010

I've been reading up on this whole subject, but I never came across this specific problem. I already understand that the whole idea of serializing an entire form is a horrible idea and just doesn't work. But, I am encountering a bit of a different problem. I have a class that inherits the "button" form object, that I call DataButton.

Now for my problem. I want to be able to serialize this class, but I don't need any of the information from the actual button class. Is there any way to bypass the fact that I can't set the button form object to Serializable() and notify VB that when serialization is to occur, it should simply skip over that information? Theoretically, if such a procedure were possible, I'd be able to do the entire serialization without a hitch.

I came up with the idea earlier of removing the "inherits" feature from the class, and having simply a button within the class, but that makes my program really difficult to work with as I am constantly changing the location, size, backgroundImage, text, and whatnot. Thus, immediate updates would be much tougher to work with.

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How To Know If Class Has Been Extended With Extension Methods

May 30, 2012

In VB.NET or C#, is there a way to determine if a class has been extended with extension methods?

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C# - Serialize A Class Containing An Object (of Any Serializable Type) To XML (Conditon: .NET 1.1)?

Sep 21, 2011

Question: I must get the content of all sessions in a HttpModule, under .NET 1.1. (don't ask my why certain people still use it) I can write the module, I can get the sessions. But... sessions are stored as

[Code]...

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Dependent Object Will Not Return Data For Extended Fields In TPT

Jul 22, 2011

I am using TPT modeling and writing the EDMX by hand as our data model is much more complex than the designer can support. My model includes a ProjectObject which has a dependent object name Project. When I query ProjectObject.OfType(Project) using Linq to SQL, I receive back data in all the fields that are inherited from ProjectObject, but no data in the fields that only in Project. I have ran a SQL Server Trace and captured the actual SQL and ran it using SSMS and it returns data there, so I am relatively certain the data is being passed back, but it seems to be getting lost somewhere in EF. Everything appears to be ok in my model, but . . .

SSDL
<EntityContainer Name="Insight_ModelStoreContainer">
<EntitySet Name="Project" EntityType="Insight_Model.Store.Project" store:Type="Views" store:Schema="dbo" store:Name="vw_insight_Project">
<DefiningQuery>
SELECT
[Code] .....

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C# - Need To Initialize New Instance Of Object

Aug 11, 2011

The following code:
CodeVariableDeclarationStatement variableDeclaration = new CodeVariableDeclarationStatement(
// Type of the variable to declare.
typeof(string),
// Name of the variable to declare.
"TestString");

Produces the following VB.Net Statement:
Dim TestString As String

What change would I need to make for it to look like this:
Dim TestString As New StringBuilder()
I'm interested in how to get that NEW keyword to appear.

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Failed To Initialize COM Object

Aug 21, 2011

I have created a web application in ASP.NET using VB.NET as code behind file. I am using a COM object of ProvideX.Script class to connect to Sage MAS90 ERP. Everything was working fine in visual studio 2010. Now when I moved to the deployment phase, the problem gets started. I deployed my application in Windows Server 2008 in IIS7. When I run the application I get the following exception.[code]...

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Best Way To Initialize Shared Members In A Class

Aug 23, 2011

I was looking on the interweb to see if there were any good examples on how to initialize shared members within a class while still initializing instance variables.[code]How do I initialize both instance and shared members without re-initializing the shared members every time an object is created from a class?

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Using Datatype Object And Determine Datatype In Class Property - Several Integers Columns That Are Null In The Db?

Mar 8, 2010

anything 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].............

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Setting A DataSet Row Value To Nothing Initialize It To The Data Type Minvalue?

Dec 2, 2010

When setting a DataSet row column to Nothing, like row.Date = Nothing, why does it initialize it to the data type minvalue? In this case a date, that gets set to 0000-01-01. The column is set to allow null etc., and if I don't set the row to anything at all, it will leave the column empty. So why does Nothing act this way?

In C# I would've set it to DbNull, I guess, but I'm a tad green on VB.NET - as you might be able to tell. :)

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