Setter Value - How To Update Flag Property Of Row
Nov 10, 2009
I've got 2 classes, one called row and one called value. The row class has an array of value as one of its properties. The row class also has a property called flag which will contain an enum for how it has changed. On the setter for value I was hoping to update the flag property of row, but I cant work out how to do it via modern OO. Here's the
Public Class Row
'Variables
Private values_local() As Value
Private flag_local As DataFlags
'Properties
Property values() As Value() .....
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Jun 10, 2011
Is there a way for implementers of an interface where a ReadOnly property is defined to make it a complete Read/Write Property ?
Imagine I define an interface to provide a ReadOnly Property (i.e., just a getter for a given value) :
Interface SomeInterface
'the interface only say that implementers must provide a value for reading
ReadOnly Property PublicProperty As String
End Interface
This means implementers must commit to providing a value. But I would like a given implementer to also allow setting that value. In my head, this would mean providing the Property's setter as part of the implementation, doing something like this :
Public Property PublicProperty As String Implements SomeInterface.PublicProperty
Get
Return _myProperty
[code]....
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Aug 27, 2009
I searched on the forum / Internet for the solution how a PropetryInfo object (of a Public property) can reveal if it has a Private Protected Setter ... it was all in vain .... all help I found was about how to "Set" value of a public property having a Private Setter.I would like to know if I have a PropertyInfo object of a public property, how would I know if its Setter is Non Public?
I tried, in a exception handling block, where I did a GetValue of the PropertyInfo object and then called SetValue by setting the same value back... but to my surprise it worked well and didn error out.
[Code]...
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May 28, 2010
I'm building an abstract class that handles some common operations for all of my data access objects. The class will utilize generics, so I can't make direct calls to constructors, business object properties, etc. Reflection is way too slow for what I want to accomplish, so I am using a DynamicMethod, ILGenerator, and Delegate caching instead (sample will follow).
The method I'm currently working on is a Private Shared method that populates a list of business objects using records from a data table. I'm having a problem building the property setter via IL. I'm getting an object reference error, but I'm not sure how to fix it. I believe the error comes from the "target" being Nothing, but the parameter I'm passing as the target is not Nothing at the time of invocation. Here are some snippets of what I've got so far:
'class declaration -- TList is strongly-typed list of T
Public MustInherit Class DataAccessBase(Of T, TList)
...
'delegate declaration
[code]...
I'm assuming the obj is not being passed correctly as the target, thus causing the target to be Nothing.
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Jan 5, 2011
I want to create a simple function that does the following:
Sub SetValue(Of TInstance As Class, TProperty)(
ByVal instance As TInstance,
ByVal [property] As Expression(Of Func(Of TInstance, TProperty)),
[code].....
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May 23, 2011
I have issue with a Nhibernate projection list, It keeps saying it Could not find a setter for property 'Commname' in class 'Label6.Domain.Product' or could not resolve property "pl.commname"
the property "commname" is a part of the object productslangs.
My product object looks like this:
Public Overridable Property Latinname() As System.String
Get
Return _Latinname
End Get
Set(ByVal value As System.String)
[Code] .....
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Jul 10, 2009
I have a flags enumeration property that I need to show in a property grid: [Code] In the property grid however, it only allows me to select a single value. I cannot combine the values like usual in a flags enum. How do I show something like a checked listbox in the property grid, so that the user can combine flags by checking items? A None and All item would be great but not required. [url]
But even that does not work properly. It seems to check and uncheck items arbitrarily. If you check the first and fourth item for example, the second and third items will sometimes be checked too. Yes, I realize that is supposed to happen with the TestEnum property (as that defines 'BottomRight' as 'Bottom Or Right', so that's logical), but it also happens with the SecurityFlags for example, which it shouldn't.
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Mar 26, 2012
with a college assignment. We are to make a program for a school class. It is on Flags of Europe. A Picture Viewer should show a flag and the students must type what the flag is in a text box. If it is correct it must say so in a label and display the next flag. I want it to add the correct answers the student got out of 10 flags.
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Apr 10, 2010
I am trying to test that a property has been set but when I write this as a unit test: moqFeed.VerifySet(Function(m) m.RowAdded = "Row Added") moq complains that "Expression is not a property setter invocation" My complete code is
[Code]...
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Dec 19, 2011
I am trying to set a flag when a collection is modified - the logical place to do that seemed to be in the setter method. The problem is when I use this code
[Code]...
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Aug 12, 2010
I created a getter and Setter in Visual Basic. I have some questions though. Please look at the code below.
A.) At line 1 below, should "pieces" be declared as Private?
B.) In the IDE at lines 4 and 7 the IDE keeps changing those variables to uppercase so that the property name "Pieces" is the same as the variable name "pieces".Should I instead define the integer pieces with an underscore: _pieces ?That is the only way I can get around the IDE forcing the variable to become uppercase. [code]
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Aug 24, 2010
In my application I need to allow for someone to enter in a floating point value.However that value will be rounded up to an integer.The challenge here is that I am using a getter and setter.If I try and use mixed data types in the getter setter,[code..]
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Jul 29, 2011
I have a class like this:
Public Class MyClass
Private _intList As New List(Of Integer)
Private _avg As Decimal
[code]....
The Getter is calculating average and calls Setter to save the value. For some reason I cannot understand, the average is always 0. For example:
Dim c As New Class2()
c.Add(1)
c.Add(2)
c.Add(3)
Console.WriteLine(c.Avg.ToString()) ' This will print 0
What is the cause of this?
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Apr 7, 2010
I am working on a project that uses lots of custom class objects.Before starting work on real project, I tested the object behaviour on a temporary project. And find that if i add the object to a list and combobox and then make any change to the object property then it reflects in list and combobox.But after using the same process in real project the change does not reflect. how can i update object property placed in the combobox.for eg.Class X has property id and name created objX of type Class X and set id=1 and name='All' insert objX to combobox now, in the same form and in other function when i get objX from combobox and change name='None', then it does not reflect in combobox.
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Mar 29, 2010
I am creating labels at runtime. Inside the .tag property I have a structure. Everytime I attempt to update the structure the .tag property doesn't update.
Here is the structure:
Public Structure structChip
Dim kingStatus As Boolean
Dim currentTileLoc As Integer
[Code]....
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Apr 2, 2011
I have a List(Of SomeObject) that I enumerate over using a For Each loop. This SomeObject contains a Property that references another Object, as such
Class SomeObject
Public Property Another As AnotherObject
Get
[Code]....
If not, what is a valid way to do it? (ordinary for loop perhaps?)
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Feb 19, 2011
There is a problem in my project. It has a class with several properties. When I set the property, it send command to device through serialport. But the problem is when I get the property, it need to send request command to device, and device return value back. How can I update the property?
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Apr 6, 2011
I have a GridView that is tied to an EntityDataSource. Most columns are normal bound columns, but two are itemtemplates. When I attempt a delete on one of the rows I receive the following message:
"A property named 'Building1.building_name' was not found on the entity during an insert, update, or delete operation. Check to ensure that properties specified as binding expressions are available to the data source."
I'm not sure how it is possible that this isn't available, since it displays the element just fine when I'm just viewing - it just throws the error when I attempt deleting a row?
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Oct 6, 2009
normal when coding, create flag with 2 value : true or false
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Mar 22, 2009
Whats the syntax for 'Not Null' or for when a field contains a value? I'm trying to make a flag be set when a textbox contains a value, but I don't know how to write the code to do this.
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Dec 12, 2010
I am working with a bowling scores program that displays a high score, a low score, and an average. I need to know what flag to use to end the loop. If I use a number, that messes up the values I need.
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Oct 3, 2011
I'm taking a course in Visual Basic 2010 and I'm trying to get a grasp on this new term called a flag. I kind of understand that it has something to do with a boolean condition. I don't quite understand what a flag is. I see references to it using the term flag. I understand it has something to do when a boolean, a condition triggers a flag. But what is the flag.
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Jul 28, 2009
This is my first post on this forum, so please excuse me if I'm posting wrong. Anyway, I've been having an issue that I've never seen before and is driving me nut, I have a windows form on which I have placed many textboxes that display information from a MS SQL database. The user can then change these values and hit a "save" button which writes the changes to the database. I also have certain textboxes that with the "on leave" event (after a user enters a possible new value) trigger a method that recalculates some of the other fields based on the new information. Hopefully that all makes sense.
So the problem is, when I run through this "recalc" method the first time around, it doesn't update those textboxes that it's supposed to. However, when I put a breakpoint in and debug through it, the debugger shows it putting in the correct values into the textboxes. It's just as soon as the method is done, it puts them back to blank, or whatever they were before
'Rebind stuff here
lblCabinets.Text = curMfg.ToString("c")
txtCabinets.Text = curMfg.ToString("c")
[code].....
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Feb 16, 2012
I'm using LuaInterface for .NET to create Windows Forms objects. This works pretty good except for one thing:I want to use the Anchor property of Control to make them resize automatically. If I only set one of the Anchors (e.g. only AnchorStyles.Top), it works, but this doesn't really make sense. I have to set more than one Anchor, which is done by combining them with "bit-wise or" (or by just adding them numerically).
In VB.Net both works:
Dim myLabel As New Label()
myLabel.Anchor = AnchorStyles.Top[code]....
which is in a sense correct as "LuaInterface treats enumeration values as fields of the corresponding enumeration typ" (says LuaInterface: Scripting the .NET CLR with Lua).It is also not possible to assign the value as a number:
myLabel.Anchor = 15 -- 15 = 8 + 4 + 2 + 1 = Top+Left+Right+Bottom
This time, the error message is rather unspecific:
LuaInterface.LuaException: function
Is there a possibility to typecast the number to the correct enumeration type in Lua?
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Nov 22, 2010
I am trying to create a flag viewer in vb and just cant get it.
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Jan 2, 2011
How to get the flag icon to a ip adress ? For example, you add a textbox, a button and a picturebox, and the textbox should contain a website[url]... And when you press the button, a function getts the ip adress of the url, and setts the picturebox image to the contry flag icon.
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Jun 10, 2009
I'm trying to use lambdas in some VB.Net code, essentially I'm trying to set a flag when databound is called.
Simplified it looks like this:
Dim dropdownlist As New DropDownList()
dropdownlist.DataSource = New String() {"one", "two"}
Dim databoundCalled As Boolean = False
AddHandler dropdownlist.DataBound, Function(o, e) (databoundCalled = True)
dropdownlist.DataBind()
My understanding is that the databoundCalled variable should be set to true, clearly I'm missing something as the variable always remains false.
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May 28, 2009
Here's my VB code.
[Code]....
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Jun 11, 2009
I need to set a variable , say Flag=1 when a button is clicked.
How do i set the Flag=1 and this variable can be used in OTHER application? Meaning this Flag is set in Program A, then Program B will use this variable (always updated value). I wrote application in VB.NET.
I think app.config isn't that good (use the add key="" value "" ) because when program is executing, it will lock the app.config file.
This Flag variable will be changed according user input (button click) and i try to make this variable use across other application. How to do this?
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Apr 10, 2011
i am trying to find out how it shuffles the number 1, 2, 3 and 4 without repeating the same number within the series. So far, I think that "i" begins as 1 and RN is a randomized number between 1 and 4. The do while loop checks if "i" is the same as RN and spits out the flag as true or false. Then "i" is increased 1 at a time and so does the number of elements in the array. I believe that the array a(4) and the for loop does something that "remembers" the same numerical value not to be repeated. I'm not sure exactly what the for loop does and how the flag make this thing work.
Lets say, a case where i=1 and the RN=3, the flag becomes false. Therefore, a(1)=3. Then, i increments by 1 and a(j) becomes a(2), which puts out the values 1 and 2. Since both numbers are flag=false, it increments again. Because a(i) = RN, a(2) becomes = 3. How can this be? It has a(1) equal to 3 and a(2) also equal to 3. Each array is supposed to have NON-OVERLAPPING numbers.
The result of doing shuffle() is a random set of numbers that don't overlap:
1234, 1243, 1342, 1324, 2341, 3412, 4321, 3214, and so on.
but never 1111, 1112, 3333 or 3242.
To find out how exactly it works, I tried to delete some lines, tweak the numbers. The result of that is either numbers change to repeats, all zeros or a logical error. The following is the code placed in the module and can be used for other forms and in this case it is used for the labels in form1 windows form:
Sub Shuffle()
Dim a(4), i, j, RN As Integer
Dim flag As Boolean
[code]....
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