.net - Child Type In General Function?
Apr 15, 2010
I have a MustInherit Parent class with two Child classes which Inherit from the Parent.How can I use (or Cast) Me in a Parent function as the the child type of that instance?EDIT: My actual goal is to be able to serialize (BinaryFormatter.Serialize(Stream, Object)) either of my child classes. However, "repeating the code" in each child "seems" wrong.
EDIT2: This is my Serialize function. Where should I implement this function? Copying and pasting to each child doesn't seem right, but casting the parent to a child doesn't seem right either.
[Code]...
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Jan 11, 2010
When catching an exception in .net, you can have as many type-specific exception blocks as needed. But I usually try to have at least one "general" exception catch block. But is there a way to get the type of the "real" exception thrown that is caught by the generic exception handler, perhaps using reflection?For example, if I have
Catch ex As System.ServiceModel.FaultException(Of InvalidUser)
ProcessModuleLoadException(Me, ex)
Catch ex As System.ServiceModel.FaultException(Of SQLExceptions)
[code].....
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Oct 19, 2010
What does this error mean in VB6? Function or interface marked as restricted, or the function uses an Automation type not supported in Visual Basic.
I keep getting it when i call a particular method of a dll that comes with windows xp and beyond (in system32 called upnp.dll)
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Mar 12, 2012
I am having some issue here, and I am not too sure how to handle it. If you could lead me in the right direction
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Mar 3, 2011
Just so it's known, this question is mostly academic, even though I tried to use the concept in a real-world solution. I realize the example is contrived, but I believe the concept is valid.I want to write some fluent code like this:
[code]...
I realize that I can't force an anonymous type into a specific type (like implementing an interface or some other class), and I don't want the overhead of defining a specific class just to match my desired fluent name with the actual method name. So I was able to make the code work like this:
copy(my_first_file).to.Invoke(my_second_file)So there is no IntelliSense or type awareness there, and I have to include the Invoke in order to have the method run. How can I get more type safety and exclude the Invoke method, under these constraints: Anonymous Type returned from Method No additional classes or interfaces Preferably, I do not want to pass in another parameter to the copy() method that tells what type to return, unless copy becomes a generic method (but I think that means defining another class/interface, which I don't want to do)
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May 12, 2012
I have an XML file and I have a function to which this XML is passed as string. I have loaded this string in Xmldocument and I need to insert few children nodes under one node. This function returns the modified XML string. I want that whenever this function is called, new child nodes are added, currently, It adds child nodes once.Do I need to overwrite the XML file ? If so, How can I replace the node with new node ( with new child nodes added) so that It has child nodes added before the function is called again ?
My code looks something like this:
Dim doc As New XmlDocument
doc.LoadXml(applicationXml)
Dim parentNode As XmlNode = doc.GetElementsByTagName("prList").Item(0)
[code]....
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Feb 18, 2011
Im working with MDI parent/child objects. when closing the child objects i need the child to check to see if it is the last child object before closing. i couldn't find anything on google, maybe im searching for the wrong thing.
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May 23, 2012
I have created 2 forms (Parent & Child), i want to store the unique textbox value to a variable into the parent form.
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Jun 11, 2012
I need to create a function which have either 1 parameter with a string as data type or 2 parameters with double as data type.Something like the substring method.
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Aug 5, 2010
I need to get all controls on a form that are of type x, I'm pretty sure I saw that code once in the past that used something like this:
dim ctrls() as Control
ctrls = Me.Controls(GetType(TextBox))
I know I can iterate over all controls getting children using a recursive function, but wondering if there is something more easier or straightforward, maybe:
Dim Ctrls = From ctrl In Me.Controls Where ctrl.GetType Is Textbox
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Nov 2, 2009
I've created a class that inherits from Dictionary(Of TKey, TValue) called KeyCopyDictionary(Of TKey, TValue). I'm now trying to use a pre-existing function which returns a Dictionary(Of String, String) and assigning it to a variable of type KeyCopyDictionary(Of String, String). I'm getting an invalid cast exception. Is it not possible to assign a variable of a parent type to a variable of its child type? I've tried DirectCast and CType to no avail on this...
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Jun 26, 2011
I am having a toolstrip in the mdi form which contains save, update delete and clear buttons. The child form is having save, update, delete and clear as public sub routines , and client form will not have any standard buttons, I will click the respective button in the parent tool window which should call the child forms function.
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Apr 16, 2009
I have a form that is set up like a master/detail form - fields on top with a child grid below. The difference here is that the child grid is reflective of a recursive relationship. That is the ID of the master has a one-to-many relationship with another attribute called "parent." the child grid displays all the children for that parent. It works properly except when a new record is being added to the master.My issue is that when the user clicks on the Add New button, the child grid then displays all the available parent records in the system instead of an empty grid. Once the new master (parent) record is saved, the grid reverts to proper behavior.Thus, my question: How do I prevent the child grid from displaying all the parent records when a new master (parent) record is being added?
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Jan 27, 2010
i want to know what is the default type of function or method declared without public,private,friend,protected,protectedfriend keyword
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Dec 23, 2010
In my project (which I inherited from someone) there are a lot of functions like:
Public Function DoSomething(ByVal s As String)
' Do something to public properties
End Function
And they are called like this:
DoSomething(s)
So the return value is ignored (which is object, as I see in the docs). Is it safe to change all these functions to Subs? Could I break something which isn't so obvious?
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Nov 8, 2011
I've got this MustInherit class called ViewerElement, from which derive classes like ViewerLine, ViewerImage, etc.Then, in the main program I have a collection of different elements (Images, Lines, etc.). What I want to do is something like the following:
[Code]...
I'm getting desperate to implement this Clone method without getting errors. How should this be de done?
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Jun 12, 2009
So, let's say I have this code (VB.Net)[code]...
What I don't like is:
- relies upon reflection
- loosely typed (no compile time checking)
- I'd rather store the binding information somewhere other than ID, but don't know where else it could go within the aspx definition. Moving the binding declaration to the code behind would be better in some ways, but worse in others.
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Mar 27, 2012
I know a little about using a user specified type IE IIf(Of ReturnType)(ByVal expression as Boolean, ByVal TruePart As ReturnType, ByVal FalsePart As ReturnType) As ReturnType...Which works, however I've been trying to get this to work, but can't..
Protected Function InverseSign(Of ReturnType)(ByVal value As Double) As ReturnType
Dim result As String
Select Case Math.Sign(value)
Case -1: result = "+" & Math.Abs(value).ToString()
[code]....
Using try cast just gives me the error saying ReturnType has no class-constraints? whatever that means..But my goal here is to be able to return either a string or double.. However every method I've tried to convert my result string to the ReturnType doesn't work.I've also tried simply overloading the function, but I can't because they only differ by return type. So that didn't work either.
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Mar 10, 2011
Is it possible in VB to have a function that can receive diffrent parameter, like a String or a Integer or a custom class type?
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Jul 29, 2009
I get a compile error Type "ctltype" is not defined with this code.
This is .NET 1.1 legacy code so not good I know.[code]...
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Sep 1, 2010
I have a dll ( vb6 ) containing a public class with a public Type ( named Test ) and finally a public function that wants a variable passed by ref of Test type. Obiouvsly, if I reference that dll in a new project ( vb6 ) I can see the public function and the Test type I must use...the problem comes when I must call that dll creating it at runtime without any reference, using in example CreateObject. Can I reference in some way the type Test inside the dll by having created it at runtime? If I declare a type IDENTICAL to the Test type in a public class in my new project, VB issues a TypeMismatch error even if both data type are the designed the same say, have the same name and so on! how it comes?
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Apr 25, 2012
I wish to incorporate general expressions in my Visual Basic work.Other than the basic inputting "Imports System.Text.RegularExpressions", I have no idea how to do put general expressions in my VB project.However, I can create the expressions (so, all is not lost).
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Apr 8, 2009
I would like to know if there are some in built functions for the scenario that is described below :
The input is the path of a parent folder. Wat the function must do is , it should list out all the .zip files inside that parent folder.The parent folder can contain any number of subfolders, and the same applies to the subfolders too ..
VB version is not a barricade. Any of the versions VB6 or VS2005 can do. Also is there any other alternative way if there are no inbuilt functions as such.
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Apr 29, 2010
Currently I have written a function to deserialize XML as seen below.How do I change it so I don't have to replace the type every time I want to serialize another object type ? The current object type is cToolConfig. How do I make this function generic ?
Public Shared Function DeserializeFromXML(ByRef strFileNameAndPath As String) As XMLhandler.XMLserialization.cToolConfig
Dim deserializer As New System.Xml.Serialization.XmlSerializer(GetType(cToolConfig))
Dim srEncodingReader As IO.StreamReader = New IO.StreamReader(strFileNameAndPath, System.Text.Encoding.UTF8)
Dim ThisFacility As cToolConfig
[code]....
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Aug 1, 2011
After reading this post i realized that i cannot pass an anonymous type as a parameter to a function. So what other options do i have?
Perhaps, passing a Query.ToList as parameter would help, or am i re-inventing the wheel?
Update: I have the following query, which i would like to pass to a function:
Sub Test
Dim Query = (From c In DB Select New With { .ElementName = c.Name })
DoSomething(Query)
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Aug 3, 2011
I am trying to over come this paoblem from last 2 days But i am not able to overcome.I was able to set up the environment so that I can call .NET method (via COM) from a classic ASP page.Everything actually works as intended until when I have to call a .NET method that requires a .NET type.So I have a method named SetTable Like Below I have a function like this in .Net
Public Sub SetTable(ByVal _City As City, ByVal _Country As Country)
'doing some thing
End Sub
and i have asp code like this:
dim CountryUtil, City, Country
set CountryUtil= Server.CreateObject("mydll.CountryUtil")
set City= Server.CreateObject("mydll.City")
[code]....
' I get this error here:
'Microsoft VBScript runtime error '800a0005' 'Invalid procedure call or argument: 'SetTable'
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Jan 17, 2011
if i got a function with a try cath block inside and the function should return an integer.how would i do it that the function can return me a the error message?public function test() as Integer
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Dec 10, 2009
Public Function manyarrays(ByVal ParamArray ints() As Integer,ByVal strs() As String) End Function But it is error . How can i fix it ?
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Mar 22, 2011
How can I create a function that returns an object of a certain type, which the user of the function specify in the argument (using vb.net 2010) ?
[Code]...
The code above doesn't work, but maybe it can explain what I want to achieve. Using this feature, I want to hydrate my data transfer objects from datatable. Client will just call this function, specifying which DTO the client wants, and this function will just create that DTO and populating the properties with reflection GetType.GetProperties().
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Jan 13, 2011
I would like to write a generic function that would search a List(Of T) for all elements of type TFilter and return a List(Of TFilter) which comprises those elements.
I've tried this:
Public Function FilterList(Of T, TFilter)(ByVal ListToFilter As List(Of T)) As List(Of TFilter)
Return ListToFilter.FindAll(Function(z) z.GetType.Equals(GetType(TFilter))).ConvertAll(New Converter(Of T, TFilter)(Function(z) CType(z, TFilter)))
End Function
But, it gives the following error:
Value of type 'T' cannot be converted to 'TFilter'.
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