I defined the following extension of the Date? data type
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But when I moved my compiler definition to a separate DLL, I the ToObject method was no longer available from my project even though I had referenced the Class project which now contained the extension. Is this a limitation of the Compiler Extensions? HOw do you get reusability out of them?
Briefly, what I'm trying to do is add some methods and properties to the FileInfo class, which is sealed (NotInheritable). As far as I can tell, I have two options to do this.
1) Inherit from FileSystemInfo (the base class for FileInfo) and recreate the methods and properties added by FileInfo (essentially recreating the FileInfo class from scratch)
2) Use extension methods (??) which I just learned about two minutes ago and it being 1am, I'm going to get into this tomorrow
3) Create a wrapper class around a FileInfo object - I think that's the proper term
Ok, so I guess there are 3 options.
A) Why make a class uninheritable
B) Is creating a wrapper class "basically" the same as inheriting from an object, but at least with inheritence you don't need to create any properties and methods other than those you want to modify or add?
Am I correct when I say that a Field is a protected property that can only be accessed by the base class and inherited classes, or is the definition of a field something else?
is there a way to access Microsoft.VisualBasic.CompilerServices or is it hidden from us.
i was going to play around with some of the classes in this namespace but couldn't find a reference to it.
What is an intrinsic value type, and what is the difference to non-intrinsic value types?I couldn't find documentation about the effect of the option "Function returning intrinsic value type without return value." in Visual Studio's VB.Net project properties'
View 2 RepliesHow to declare this as a sealed class (non-inheritable) I used this in my main coding..
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Possible Duplicate: CompilerServices.Operators equivalent on C#
I was looking for Microsoft.CSharp.CompilerServices.Operators but couldn't find it.
When ever I start a blank WPF project in Visual Basic 2010 (SP1) I get the following error:
Type 'Microsoft.VisualBasic.CompilerServices.DesignerGenerated' is not defined.
The error comes from the auto-generated code in MainWindow.g.i.vb - when I try to add a reference to Microsoft.VisualBasic, it says I can't because it will be added at runtime.
That is the question. Is there anything you can do with c++ unions that you can't with c# Explicit structs?
View 3 RepliesI've read that making a class sealed in C# is advisable in high-performance scenarios because it frees the compiler to make certain optimizations (e.g., inlining property getters) that it wouldn't be able to make otherwise. Is the same true for NotInheritable in VB.NET?
View 1 RepliesI was wondering, what are the benefits of having a variety of different data types available to programmers?
View 1 RepliesI am working on a produce inventory database in my VB Express program. I have a form on the bottom and a spreadsheet at the top. I want to enter all the data in the form and have that data automatically transferred as a group to the spreadshet in the upper part of the page when I press a button.
I know that there's an insert function. I set it up correctly. The problem is that I have to convert the textbox, which contain string data, to the datatype used in the database spreadsheet. HOw do I use CAST or do this?
Here's the function I am using:
Me.TableAdapterManager.InventoryTableAdapter.Insert(IDTextBox.Text, fruitName, unitprice, unitsize, unitIn, unitTransit, unitOut)
Evernything is a string cause the data is coming from a textbox, I need to convert it to the datatypes used in the database.
I need to call a function that expects a DataType as a paremeter. I fail to get the right syntax to specify a datatype (integer, string, single, boolean, etc):
Public Sub AddSetting(ByVal PropertyName As String, ByVal PropertyType As Type, ByVal DefaultValue As String)
Dim p As New SettingsProperty(PropertyName)
p.PropertyType = PropertyType
p.DefaultValue = DefaultValue
[Code] .....
Ever since I moved from VB6 to VB.NET somewhere in 2005, I've been using CType to do casting from one data type to another. I do this because it is simply faster to type, used to exist in VB6 and I do not know why I have to be using DirectCast if there is apparently no difference between them.I use TryCast once in a while because I understand that sometimes casting can fail. I however cannot get the difference between CType and DirectCast.
View 3 RepliesUsing VB.Net and C#.Net.
For Example
Am Using More than one form
If am assigning a variables like this.[code]...
This variables cannot be easily understand for everyone(other programmers).
How to assign a Standard Datatype variables,
Standard Variable Means (Everyone can understandable)
And also How to give a standard name for gridview, text boxes, labels etc.
Changing datatypes of properties of serialized objects?
View 1 RepliesAnyone have any insight on the Big O notation for comparisons for a LINQ Except query using primitive datatypes? I couldn't find anything on google.
View 3 RepliesLet's say I have two forms: Form1 and Form2.In form1 I have two buttons. btn1Frm1 opens Form2 As New Form2. btn2Frm1 opens Form2 as New Form2
View 3 RepliesI'm looking at the following in the Data Types docs for the Windows API:
#if defined(_WIN64)
typedef __int64 LONG_PTR;
#else
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I m new to VB. I have created a form with Menustrip and want to reuse this menustrip in other forms. Could anyone plz tell me how to do it ?
View 8 RepliesI have a form in a C# project that I started and now I want to use that same form design in a new VB project I'm starting. Is there a way to "export" the form from C# and import it into my VB project? Obviously, I don't want the C# code behind the form, just the design.
View 1 RepliesDim conn As MySqlConnection Reuse a variable from another event?
View 3 RepliesI am recently new to Visual Basic and am starting to learn some things i have managed to connect to the SQL Server and Insert rows to a table. But is there a way to be able to re-use an already existing connection ?My code below. I tried to create a class for the Connection object.
Imports System.Data.SqlClient
Imports System.Data.Sql
Public Class dbConnection
[code]....
It looks like they are converted to regular date types in the generated proxy object.I'd like to optionally pass null values for these dates.Other than switching to WCF (no time to learn it right now), what is the best way to handle this situation. It looks like I also cannot pass NULLABLE date types.
View 1 RepliesI wanted to know if it is possible to reuse a class I created in one application in another application. Basically I created a test program and once I got all the components working I created a class for it and well I want to use the class in another program, how can I do this?
View 2 Replies(using vb 2008 I am learning the workings of Custom Events. I think they might solve the problem of being unable to declare nonserialized events in vb2008. However, do custom events follow any sort of inheritance pattern like classes
View 4 RepliesI designed a form - please see a picture My first intend was to "link" each button on the menu [Employee Management, Contact Information,...] to different forms by coping this form and then designing the contents of the form using many repeated following code
Dim oForm2 As New Form2()
oForm2.Show()
Me.Hide()
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I have this code
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When I add an image to the imagelist, the con shows up. That's fine Let's say that I added 4 images (four items to the listview) then remove one item from the listview. From there, the next item I add will adopt the previous image added. How can I keep this from happening?
How can I tell something to use a code without completely adding it in that sub again? I have some code that will be used alot within my program. I could write a DLL, but I don't know how to use those!
Here is my code:
Dim str1 As String = System.IO.File.ReadAllText(Me.OpenFileDialog1.FileName)
Dim s2 As String = str1.Replace(".[1gs5]", "a")
s2 = s2.Replace(".[u775]", "b")
s2 = s2.Replace(".[fsef]", "c")
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It is possible to buil un user control with a menu strip with this options (add record, delete, update) and reuse it in difrent forms?But, for example in form name "Cars" the option Delete must delete the cars currente record, but if im in form Buses, the same button wiil delete the bus record.
View 5 RepliesWhats the easiest way to reuse the content of my project ... e.g. Forms,UserControls. that will include all the required files ... e.g. resources,pictures
View 2 Replies