have a complete list of the conversion operators for VB/C# and how they differ?
value as type [C#]
TryCast(value, type) [VB]
Convert.ToXxx(value) [any]
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But of course just having the list isn't the same as knowing the subtle differences between each one.
I recently installed visual studio 2010 and am using visual basic.The problem I am having is that some operators do not show up within the editor. For example the code line below
test = 3 + 5 - 6 / 7 * 4
only displays
test 3 5 - 6 / 7 * 4
the = + operators are not visible although they are there since the program will work as intended....and if I open up the .vb file in notepad everything is there. It just won't display within Visual Studio.
Is it possible to find a complete object in list of objects?
how to find x in list1 if it exists without comparing a single property like ID ?
In VS 2008, I built a touch-screen Windows Form aplication for selecting organization names. I have a combo-box with all of the org names.I have a button array with each of the letters of the alphabet wich the user can touch to start populating the combo-box. I have AutoComplete set up so that as the user types, the org names come up and the user can, with just a few taps, select his organization.
Everything functions properly and is really slick, but...The font size in the AutoComplete list is too small and any given entry cannot be easily selected by touch.I can easily increase the font size in the combo-box, but for the life of me I cannot figue out how to change the font size in theAutoComplee list.
I would like the autocomplete list of a textbox to be the words that the user has previously typed and saved. For example if they enter "dog", "cat" and "fish" I want the autocomplete suggests to show these three options. So far my Code only shows the last user input. I expect there is an easy solution as I am new to all this, but I can't seem to find it on my own.
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We are currently converting a larger legacy application from .Net1.1 to .Net2.0, both VB. Our new standard is Generic List, instead of arrays.We are recoding component by component. And while not everything is yet stored in generic.list we end up with compile time errors.Converting from generic.list to array is supported with myGenList.ToArray().But from array to generic list isnt that easy."Value of type '1-dimensional array of something' cannot be convertet to 'System.Collection.Generic.List(of something)"I know for sertain that the array consist of the type 'something', so an runtime exception converting is ok.Is there a good way to do the workaround untill the hole application is recoded?
View 1 RepliesIs it possible to define operators like addition, subtraction and such to classes? I'm trying to convert a vector class from C++
class CVector2
{
public:
float x, y
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I want to place the arithmetic operators in an array so I can randomly select one at a time. I am not sure how to declare and initialize them so that I can use them in an equation.
View 11 RepliesWhy aren't the assignment operators (+=, -=, *=, /=) overloadable in VB.NET?
View 1 RepliesDid anyone else read this article under Visual Basic News? I thought it was a very bad treatment of the subject. I especially don't like articles like that when the code they post relies on Option Strict Off.
View 12 RepliesAs a learning experience I decided to try and implement the Shunting Yard Algorithm(string calculator) using OOP. It was successful for as far as I took it, but it had one flaw. In order to get the stack to be accessible from the operators I had to declare it as shared, which meant that all versions of the calculator shared one stack. This very short piece of code illustrates what I came up with and the "flaw". [code] How can I maintain the functionality of anOP.add1 without declaring "something" as shared?
View 9 RepliesAccording to MSDN The And operator can act as a bitwise operator OR a logical operator.The only way to know if it is used as One operator or another is, If it is on the right side of an assignment operation? for example x = 3 AND 5. I cannot find any other instances where the bitwise operator would be used instead of the logical operator, are there?
View 1 RepliesHow do I bitwise shift right/left in VB.NET? Does it even have operators for this, or do I have to use some utility method?
View 4 RepliesCan I store the common operators such as '>', '<', '+' etc., in a variable and then use it when required.
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so here instead of directly using > and +, Can I use the variables OP1 and OP2 somehow. May be I can put the entire string from "If..... NUM1" in another variable as text string and then execute that variable.
Using 2 objects of the same type, I'm trying to implement < and >, but I can't seem to find any authoritative source on what to do with either or both being Nothing. In other words what the accepted practice or MSDN suggestions are.[code]Accessors is my canonical method for centralizing an enumeration of the properties (all are decimal)return false for both if either is Nothing?I found a comment, but can't seem to verify or validate it that A null object is always less than a non-null object..
View 2 RepliesI have a weird situation. I have a C++ code that overloads the +,-,* operators and exports them in a .DLL file. Now, I want to import those overloaded operators from within VB.NET code. So it should be like this:
<DllImport("StructDLL.dll")> Public Shared Function
Operator +(ByVal a1 As A, ByVal a2 As A) As A
End Function
So what I'm trying to do above it just import the lovely overloaded operator + from the DLL.Note that the operator is already overloaded from inside the DLL, so should I import it as a Function or as an Operator like this?
<DllImport("StructDLL.dll")> Public Shared
Operator +(ByVal a1 As A, ByVal a2 As A) As A
End Operator
The overloaded plus operator is supposed to add structs. So the DLL is programmed to work on structs (C++) and I want to import it in VB.NET to work on Structures.
I have a custom class that simply contains a public variable X.Let's say I have two instances of the class, A and B.If I execute an assignment operator, such as:A = B then I want A.X equal to the VALUE of B.X.But, I'm pretty sure that this will just assign B to the variable A.Assigning pointers, in C++ lingo.I looked in the VB.NET docs, which state that "The operator can be overloaded only as a relational comparison operator, not as an assignment operator."
View 7 RepliesIn C# you can use the implicit keyword to define an implicit user-defined type conversion operator.In VB.NET you can define a CType conversion operator that will explicitly convert a user-defined type into another type.Is there a way to declare an implicit conversion operator in VB.NET?
View 1 RepliesI'm having the exciting task of finding out about VB.NET's <> and Not operators. Not - I'm assuming by my small use of it - is the functional equivalent of ! in languages such as C# and <> being equivalent of !=.
In VB.NET a common problem is doing Boolean expressions against objects that don't have a reference, it appears. So if we do If Request.QueryString("MyQueryString") <> Nothing Then This will actually fail if the query string doesn't exist. Why, I don't know. The way that it's done by older coders is as follows: If Not Request.QueryString("MyQueryString") Is Nothing Then
And this tends to work. To me they're functionally equivalent though operators tend to do different comparisons dependent on certain factors such as operator precedence, why it doesn't work in this case however, I do not know, and neither have I found any relevant material. I ask this as I'm having to write standards documentation and we're determining the use of either the Not or <>.
I have to perform calculations dynamically in ASP/VB.NET (Possibly SQL Server). Something like this:
Dim var1, var2 as Integer
Dim Optr as string
var1 = 15
var2 = 25
Optr = +
MyResult(var1, var2, Optr)
And MyResult should equal 40. How can I do this?
I have a class that implements an interface. Other objects will get an instance via a method like:
Dim AU1 as IAUC = GetAU(<some GUID>)
Dim AU2 as IAUC = GetAU(<some other GUID>)
What I would like to be able to do is this:If AU1 = AU2..The parts of the class that make up the interface could be equal when the rest of the class is not, and the equality of the interface objects (if you can call them that) is complicated. Several fields have to be compared in odd ways.One option I have is to just add an Equality method to the interface, which would work, but I would rather overload the = and <> operators. As far as I can see, you cannot overload operators as part of an interface, but I was hoping that I had overlooked something.
If you create new projects in C# and VB.NET, then go directly in the Immediate Window and type this:
? 567 / 1000
C# will return 0, while VB.NET will return 0.567.To get the same result in C#, you need to type
? 567 / 1000.0
Why is there this difference? Why does C# require the explicit decimal point after 1000?
I have a simple routine to find the next object based on a name property in an un-ordered collection of objects. I go through the collection and collect all the names in a List(of String) adding any names that are > my current name, which should give a list of everything that comes after the current key. I then sort the list using the default .Sort() method on the List(of String) and take the first item in the list, which should be my next item. I do the reverse to find the previous item, add all items < my current name, sort, and take the last item in the list.
However, this method skips over some items. For example I have items named 1210, 1210-ADA, and 1210_ADA_DB. Using this method, getting the next item skips the middle item 1210-ADA and finds 1210_ADA_DB, but finding the previous item seems to work.
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Given that a typical coding mantra is "Don't induce side effects in method calls." and that the only reason (that I know off - please enlighten me if I'm wrong) to not use short circuited operators is when you depend on the side effects of a method call in subsequent code. Why isn't the default operator in languages like C# and VB.NET not a short circuited version?
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Of the 51 Standard Query Operators (of which only 42 are actually query operators), only 24 are directly supported by Visual Basic 9 and just 11 by C# 3: Query Expression Syntax for Standard Query Operators.In many cases, query syntax is arguably more readable than the equivalent method syntax, especially when transparent identifiers are involved. However, that readability breaks down if you have to combine queries and method calls.So the question: What query operators, current or hypothetical, would you like to have your language of choice support in query expression syntax?
View 2 RepliesPossible Duplicate: CompilerServices.Operators equivalent on C#
I was looking for Microsoft.CSharp.CompilerServices.Operators but couldn't find it.
Am using VB 2008 OS XP the problem am having is am getting an error Name 'Operators & Conversions' is not Declared , here is the code
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Every one I want to Overload Operators for Matrix Operation in Vb.net I am trying it to do, but as i am new to VB.net
View 1 RepliesIs it possible to overload the array/dict access operators in VB.net? For example, you can state something like:[code]And that works just fine. But what I would like to do is be able to say:mydict("Cool guy") = "3"and then have 3 automagically converted to the Integer 3.I mean, sure I can have a private member mydict.coolguy and have setCoolguy() and getCoolguy() methods, but I would prefer to be able to write it the former way if at all possible.[code]
View 2 Repliesa user will enter a number, n, which ranges from 1 to 30. they will also enter a "P" or an "S" (sum or product). depending on which was selected, it will calculate the sum or product of the numbers from 1 to n.i'm having a conversion error on line 5 stating "Conversion from string "S" to type 'Double' is not valid." [code]
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