Is there a way to validate ALL properties in a class at once? I have a class with various validations added to property "Getter" to validate user inputs. (The problem is that all my validations only invoke if a user input something to the field that bind to the property. Any fields that user simply bypass will not get validated). Ideally I want to loop through each property and validate in a "Save()" method.
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Ok so my boss told me that I can't use DataSet's and dataadapter and such like this because it isnt good for scalability. So, I must change the way I have my 28,000 records binded to my form. The problem is, I'm only 3 months in with VB.NET and I don't know of any other way to accomplish what I need to do. I was reading somewhere that I can use a Class as my "Order" and I can bind the variables/properties to the form and with this, I can navigate through records while having controls on each important part of the "Order". Unfortunately, I don't know what I'm doing, this is as far as [code]Any guidance as to what I am to do from here in order to pull the data from my database and bind to the property, then to a text box/combo box, and a way that I can use my binding navigator to go through the many records.
View 13 RepliesIs there any way to add new properties to a control? For example, I'm using an "OvalShape" from Microsoft's Powerpacks, these are designated as "Cells". I would like to add properties to the class itself (if I had a physical class to edit) for different processes such as "energy level", "family number", "mutation", etc. General variables that are either Boolean, Integers, or etc. If there isn't a way to edit the powerpack class itself, is there a way I can use the ovalshape power pack in my own class and add extra properties to it myself?
View 3 RepliesI am just learning about making classes and need to make one with 2 properties.Below is the beginning of a class for ingredients in a coffee machine.But I want sugar and water to also hold name (string) ='sugar' and number(integer) = 4 so its like thisIngredients.coffee.name or ingredients.coffee.number[code]
View 3 RepliesI'm trying to make a very simple audio tag editor. The idea is that the user can select as many audio files as he likes from a ListView, and a PropertyGrid will then display their tags + their values.When multiple files are selected, I want the property grid to display the values of the tags that all files have in common, and display empty values for tags that the files do not have in common.As an example, look at the properties list in your Visual Studio IDE when you select multiple controls (of the same type for this matter). Select a few Button controls, for example, and notice that the properties whose values are the same (often things like Font, ForeColor, etc) are displayed. Also notice that the values for properties that are not the same (Text, Name, etc) are empty.
View 17 RepliesI'm trying to figure out a way to sort the entries of a listbox... but in a different way instead of the obvious one (sorted property). First of all, I need to explain how the items are populated at first:
[Code]...
This is another one of my "I think it's not possible but I need confirmation" questions.I have a base class for a bunch of child classes. Right now, this base class has a few common properties the children use, like Name. The base is an abstract class (MustInherit)Technically, this means that everytime a child class is instantiated, it lugs around, in memory, its own copy of Name. The thing is, Name is going to be a fixed value for all instances of a given child. I.e., Child1.Name will return "child_object1", and Child2.Name will return "child_object2".
View 1 RepliesI have a class in which some of the fields are also classes.I can put values in the "normal" properties, but in the others when o try to assign values it gives the: "Object reference not set to an instance of an object"But the code compiles fine.
dados_Defenicao = New ServiceReference1.draftClaimEntryDefinition
dados_Defenicao.arCode = "123"
dados_Defenicao.claimMarket.warrantyType = "w" - Here it gives the error
How can i fix this ?
I have a class in which some of the fields are also classes.
I can put values in the "normal" properties, but in the others when o try to assign values it gives the: "Object reference not set to an instance of an object"
But the code compiles fine.
dados_Defenicao = New ServiceReference1.draftClaimEntryDefinition
dados_Defenicao.arCode = "123"
dados_Defenicao.claimMarket.warrantyType = "w" - Here it gives the error
In the form design I set up a TableLayoutPanel, 20x20 cells and in cell (1,1) a PictureBox (called Target) containing the image of a small target. The properties box for Target shows some very promising properties, Column and Row - and if you overwrite the values in the properties box, the PictureBox obligingly shifts to the corresponding cell position in th design. However in VB it is not possible to refer to Me.Target.Row or .Column - neither appears during coding in the menu of properties, and deliberately coding either of them produces an error like
Error 1 'row' is not a member of 'System.Windows.Forms.PictureBox'.
1. Why does the properties box show properties that cannot be altered programmatically?
2. How can my program move Target around in the TableLayoutPanel?
[code] how can I also allow a decimal point, and also it will not let me Exit the program unless there is something in the textbox, I have looked around and have seen a few different codes but they seemed kind of complicated.
View 3 RepliesIs this the proper way to bring up an error if the user inputs more than 2 decimals. 'Not decCost = [0-9]*.[0-9]{0,2}
[Code]...
I wrote a function that copies the properties of one class to another so make a copy of an object.So something like
MyObject myObject = myOtherObject.MyCustomCopy(myObject)
where myObject and myOtherObject are of the same type. I do it by bascually doing
myObject.prop1 = myOtherObject.prop1
[code]....
I am pretty sure in the past I used a .NET object that automaticaly did this, by reflection I guess, but can't remember it ... or an I imagining that such a method exists?
I'm trying to use the events Validating and Validated on a ToolStripTextbox.
Private Sub txtMenuOwnIP_Validated(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtMenuOwnIP.Validated
MyIP = txtMenuOwnIP.Text
StatusLabelIP.Text = MyIP
End Sub
[code].....
Neither code is firing.The CausesValidatition of the txtMenuOwnIP is set to true.I can enter stuff into that Textbox and leave it using the Mouse or simply piush Enter, but the posted code won't get fired (used a Breakpoint in both subs). There are no other event routines for this command used.
So I'm developing a Windows Forms Application in Visual Basic 2010. The user searches for data and fetches results, updates fields and some other CRUD operations. I want to provide a user input validation. Usual stuff i.e. some fields need to be always numbers>0, others need to be non-empty in order to avoid Null access on some objects and others just need to be some fixed strings.
[Code]...
I am writing below code for validating compulsary field account no. in form.User's requirement is set focus back on field when error comes :
If txtAccountNo = "" Then
MessageBox.Show("Account no filed can't be left empty")
txtAccountNo.SetFocus
Exit Sub
End If
It's working properly. But suppose user don't want to fill form and exiting from application.Message box keep on appearing till user enters account no.
as you might guess from the variable names I'm making a game (but this problem isn't game related!) which involves multiple "bullets" moving along straight trajectories. This is my attempt at changing my code for firing one bullet into one for firing many bullets at once. It works perfectly except for one thing.The class I made (BulletClass) to contain all the things needed to move the bullet isn't setting all of its properties correctly. I apologise for the walls of code however I wasn't entirely sure whether I should chop bits out. I wanted to colour code my code so that you could scroll through and see the subs where things have gone wrong, but apparently I can't even code a new thread. Let alone a video game. Instead I'll just list them, you can search for them if you like or just scroll through at your leisure.
[Code]...
In a nutshell: the properties TargetPosY, TargetPosX, ShipPosX and ShipPoseY are not working properly. As a result the calculations involving them are skewed and the bullets always travel directly downward.
I've got a Dictionary collection of a certain class with dozens of string properties.i'd like to create a datatable from this info and map these properties into Datatable columns, and for each member of the dictionary maps it to a row...
i could type out column names based on the class properties, but thats a bit specific and hard coded.
What I want to do is something like
Dim mytable as datatable For each string_property as property of myclass Dim column as new datacolumn(string_property.name) 'column add to table etc Next I'm unfamiliar with how to do this, maybe the Reflection classes are useful - perhaps the guru's can point out an efficient solution?
Is there a way to clear all the properties in a class, because i have a class where all my properties were stored, can i clear all those in just a short code?
View 6 RepliesI've tried searching... a lot for the answer, but as I'm not too sure what exactly I'm trying to do I can't seem to find anything. I'm trying to write a dll in order to handle errors thrown from a vb.net app. In the dll I need several forms (I'm not totally sure if they can have forms - I'm a bit of a newbie when it comes to dll's) for which the user can type in their message about the error and submit it.
[Code]...
I have dynamic class with varied numbers of property. At one time I need to save all data from this class. So, to do the For/Next or Do/Loop, I need to know, how many properties in class for now? Is it possible to findout the property numbers and after - property names list?
For example. I have a class INI, were was .Path as preexisted property. Then the few properties has been added and INI start consist of .Path, .Size, .Color and something else.
I dont want to keep in mind all properties has been added. All I want to get some simple loop to read all properties names and values to dump it to the file. Some sort of this[code]...
I am filling a form with values from a class, which is working fine. But now I want to take the changed values in the text box and modify the class. For some reason I have not been able to get the syntax.
View 6 RepliesI have created a class named CustomerType - CustomerTyp, which includes 4 properties - ID, Name, Number, Selected. I need to make a code, which determines how many properties has the class.
View 2 RepliesHow can I get all the properties of a class that implement a specific base class or interface? I have a properties class that contains several other property classes. Some, not all, of these classes implement an interface. I would like to know if it's possible to iterate over all properties of parent class for child-classes that implement the target interface. It sounds like a job for reflection? I'm just not sure how. Can it be done via the "PropertyInfo" object?
View 1 RepliesI have an app with my own class "something".So, Im going to one of the my modules and declare public var as a class. After fillup this class by date, I would to get this date from the other module of my app. But there this var is unavailavle (its mean I have to redeclare it again. Its mean I'll lost
View 7 RepliesWhats the best way to iteract through a class to get all the properties names? So far i have this code
Dim classInstance As New ServiceReference1.draftClaimEntryDefinition
For Each PropertyItem As PropertyInfo In classInstance.GetType().GetProperties()
Dim strPropName As String = String.Empty[code]....
My problem is: I will receive a xml file, and have to get the data in a class, but as mentioned before the class has a lot of classes as properties, and i want do do it without hardcode, I want to loop the class properties names and compare them to the xml tags (it haves the same name as the class properties), and put the values from the xml file in an instance object of the class.
I have this class
Code:
Public Class Customer
Public Property AccountNumber() As String
Public Property AccountCreationDate() As String
[code].....
This works but I tried to loop thru the properties of the class with a For Each/Next loop. It does not work as the intellisense won't co-operate with Items I think i need like "PropertyInfo" . After reading, I see that only thru Reflection can I do this. Well, Reflection has me baffled at the moment.
I have a property grid and I want to be able to set the selectedobject to a class. The class contains properties. This is what I have, but it 'OtherFiles' is not an object.
pgProperties.SelectedObject(OtherFiles)
How do you create a class as an object. In VB.NET 2008 please. C# is ok.
I want to have use several versions of the same property within a userControl that inherits a textbox. How can do this if it is possible?I tryed using an object data type insted of the integer and double but it seems like object datatypes carnt be used within a class, because when I tried to use the control the VALUE property was disabled.
'PUBLIC PROPERTIES
Public Property Value() As Integer
Get[code].....
I am trying to make the properties of class which can only be set through the constructor of the same class
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