VS 2010 Custom Type Array / List With Adding Items And Specifying Custom Type Variable
Jun 21, 2011
I recently downloaded VB 2010 Express so i am quite new to the language, but i have worked with dark basic, which seems to b very similar.Anyway, my problem is that i cannot seem to correctly set out my array of a custom type/class. i am trying to create two arrays, one of available entities and another of selected entities of which the user selects the entities to be dealt with in irrelevant ways. i have creates a button (called test) which adds some entities to the available list and all the entities come back the same value but they shouldnt be as you'll c in the code. i have run the step into command a found that "available.item(#).Name = " will change all of the entity's names.As of current i am working with lists as the array kept asking for a 'new' statement but i couldnt figure out where to put it.[code]
I have been trying to solve a problem related to using RolesProviders in MVC.Basically I would like to an additional set of criteria to the roles table so that a user can switch roles based on what they are doing on the site.However as simple as it may sound its proving to be a nightmare. I cannot for love nor money come up with a solution. I have tried overloading the provider, creating extension methods (which never work with the Roles class) but finally I decided to simply create a reference to my own custom provider and just completely bypass the whole User, Roles class.Now I am getting a ridiculous error which states that I cannot cast MyProvider class to an instance of MyProvider class? All I am doing is calling the Roles.Provider method and casting its return value to my custom provider class (which inherits from RolesProvider). The asp.net forums are a waste of time since no one ever answers the questions and there are simply no examples of extending the Roles/Membership model without using SQL server.
I have a datagridview that is bound to a list object of a custom type via a BindingSource. From everything I've read, I should be able to click the column headers and the rows sort, This doesn't happen for me. Sortmode is set to automatic and the column headers aren't set to be used for selection so it should work.
I know that I could sort progamatticly but that seems a little bit of a waste given that I should just be able to do it by default.
I have a class and one of the properties is a list of a custom class. The caller gets the list and is adding instances of class to the list. How do I get notified that the list has been updated?
Private _list as List(of MyType) Private _totalField1 as Integer Public Property MyTypeList As List(Of MyType) Get Return _list End Get Set(ByVal value As List(Of MyType)) _list= value _totalField1 = _list.Sum(Function(x) x.Field1) End Set End Property
What I'm trying to do is every time a MyType object is added to the list keep a running total of Field1, but adding to the list doesn't use the setter. How can I know when the list has been added or changed?
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'.
Dim XmlFile As FileStream = New FileStream(path, FileMode.Open) Dim Serializer As XmlSerializer = New XmlSerializer(GetType(gpxType)) ''here I get error Dim GPX As gpxType = New gpxType
[code]....
I get InvalidOperationException was unhandled. Whats wrong?
Is there way to set custom metadata to files of any type? I want the metadata to be copied when the file is renamed, moved or copied. I don't want to use ADS.
I'm building a vb.net application that composes messages for later message queueing in accordance with a predefined schema that an observer of the message queue requires.I've made the XSD file for the schema already, but I was wondering if there was any way to import the schema as or convert it to a custom object type in my .net application, where the elements of the schema would represent data fields or sub-objects to be filled programmatically.
Is there any way to do this?Am I getting my terminology correct here, or would there be a better way to accomplish what I'm attempting to do?I'd like to be able to create a schema and use it as a definition for some kind of data transfer object in my applications, without having to make the object as a separate VB class file.
I'd like to auto-register the common/simple services in my unity container. I think the cleanest way to do this would be via a custom atribute.I can then examine all the (abstract) classes in an assembly and register those types with unity.The piece of information I'm missing is the interface(s) that the class wants to be registered against
eg:
Public Class AutoRegisterAttribute Public Property ForInterface As System.Type Public Sub New(ForInterface As System.Type)
[code]....
Note, I don't just want to find any class it implements as shown with IDisposableI've tried doing this using generics (generics can't inherit from Attribute), with a Type Parameter (Passing in IEngine.GetType results in a "Constant expression is required")
I know how to add a resource to my project and I also know how to add an icon to my application. What I could not figure out is how to embed another icon for custom file types - I do know what registry entries to add / modify though, I am just not able to add a 2nd icon as resource to my profile and make it 'accessible', so, that the Windows System can display it for files with my custom extension.
I have been developing in VB.net for a cople of years now. I really miss the increment and decrement operators for integers that I grew attached to while using Java and C#. I have seen posts explaining how to implement a custom operator for a class that I have written, but I have not seen any examples of how to do it for a basic type like Integer.[code]....
I am building my own Message Box, I have overloaded the ShowDialog function and i wish to Change the Return Type from DialogResult to my own.To do so , shall i declare an Public Enum within the form and set it as the Return Type, or is there any other proper way?
I've created a custom control that I insert into my window with the following code Code: <controls:ListExpander Text="Class Diagrams"></controls:ListExpander> The control in question contains several subcontrols, among others, a list. How can create the setup, so I can specify items that should be added to the list?
In which case the SomeItem objects should be added to the list in the ListExpander: Code: <ListBox Name="lstItems" Background="LightGray"> <ListBox.Items> // Items should go here </ListBox.Items> </ListBox> I'm quite new to WPF, but I suppose it's something along the lines of creating a dependency collection on ListExpander that takes object of the type SomeItem? I simply want to be able to give the control a few arguments which it can translate into items in the listbox contained within the the control.
I am trying to implement a Custom HttpHandler (for the first time), I have been given a tutorial to follow but couldn't get it to work. I then found another tutorial but couldn't get that to work, they are both giving me the same error message.
The custom handler is to protect people from downloading certain file types, although i think the error is somekind of configuration problem as I can't get the website to work at all once I add the httpHandlers to the Web.Config file.
Description: An error occurred during the processing of a configuration file required to service this request. review the specific error details below and modify your configuration file appropriately.
Parser Error Message: Could not load type 'FileProtectionHandler'. Source Error: Line 47: </compilation> Line 48: <httpHandlers>
i have 8 new custom file types which go with my app, i can set them to open with me app easily using this code on a button:[code]But im a little stuck on what to change in that, ive made certain all my new extensions are unique and i have all my icons for each new file type made, i just need to be able to set them.
In visual studio (VB environment), for exemple, with point structure, while debbuging, in state of displaying {system.drawing.point} at the object value, its display the X and Y value.For exemple :
Dim pt as new point(8,9) A spy on pt will show "{X = 8 Y = 9}"So i want : Dim cust1 as cust_type1
to display me something differente than "{namespace.cust_type1}"
I'm attempting to create a simple menu user control just as outlined here. The attached code results in an "Object reference not set to an instance of an object" error, but I can't figure out why.
I have a drop down list with font names and I would like to display them with their styles and not names and giving that style to a custom message as shown below This is actually what I need it.How do I acheive this?
Here is how I am loading fonts from my system
For Each f As System.Drawing.FontFamily In System.Drawing.FontFamily.Families DropFont.Items.Add(f.Name) Next
I'm still learning VB.net and there is a bit of code I have added which is an array and I want to add a list of items to the array. If that makes sense. I have 6 classes two have arrays.
Here is the code from one of the classes Public Function getItems() As Array Return _LevelItems End Function
How would I add the item list to this? Where do I put it? Like underneath it or in the items class? That code is in the Level class.
i have a data set on the data set many data adapters .i add a data adapter in the data set the designer was automatically delete then lot of error was coming and i search in google and i go this method and i do that right click the data set and "Run Custom tool" on that time the designer will automatically created. but when i do that a error was coming "The custom tool 'MSDataSetGenerator' failed. Exception of type 'System.Data.Design.InternalException' was thrown."
