VS 2010 Loading An Object Property?
May 31, 2012
This question is more of a fundamental question then anything.
I've got a custom object collection, lets call it People, that holds my Person class objects. The Person class has a property called Phone Numbers. The Phone Numbers property is a custom object collection of phone numbers that are retrieved from another table. So...
Private People as BindingList(Of Person)
Class Person
Private mName as string
Private mPhoneNumbers as oPhoneNumbers
[Code]....
I'm inclined to go with option #1 because option #2 would make a lot of calls to the database if there are a lot of persons living in New Jersey.
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Aug 11, 2010
I currently have a XML file for an application I am developing. I have built a a XMLFile.GetContent function to read my XML File and load the content into a set of specific objects. These objects are then added to a collection and passed back to the main code to be loaded into the memory of the application.I am looking for a dynamic way of loading the information from the XML file into a specific Object Property. I have added comments to the function to show what I want to make dynamic.Content of XML File
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Config>
<IQSDataSources>[code].....
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Apr 25, 2011
I have a class that has a property that I declare like this:
VB.NET
Private _DirectoryList As List(Of FileDirectoryInfo) ''' <summary> ''' Array of directories. ''' </summary> ''' <value>Object</value> ''' <returns>Directory array list</returns> ''' <remarks>N/A</remarks> Public Property Directory As List(Of FileDirectoryInfo) Get Return _DirectoryList End Get Set(ByVal value As List(Of FileDirectoryInfo)) _DirectoryList = value End Set End Property
[Code]...
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May 25, 2012
I'm creating an new class object with a property that holds a generic List(of Singles).After creating this object, I change this generic list. Since I didn't pass that list as ByRef in the New-Procedure, I would expect to already created object instance NOT to change, but that not the case. Where am I wrong?
'Class
Public Class clVessel
Public Sub New(ByVal ID As Integer, ByVal Frequencies As List(Of Single))
[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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Jan 15, 2010
on a Windows Form, an object myObject is bound to myObjectDataBindingSource like this:myObjectDataBindingSource .DatSource = myObject on the form, i have a check box bound to the property: chkProp1 for example of the object: myObjectDataBindingSource In the code when the checkbox is clicked, I need to go in code and change another text property of the object txtProper2 for example like this:
Private Sub chkProp1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles chkProp1.CheckedChanged
[code].....
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Jul 4, 2011
I have a listbox of a object called Account, which has 2 fields, password, and username. How can I compare a New Account to all the accounts in the list and see if the password matches?
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Jun 7, 2012
I know how to handle a single objects property changed event very easily. I want to handle a objects property changed event that is part of another object.
Given Object:
[ObjectY = Y]
+ Public WithEvents X As ObjectX
I would like to do something like:
Private Sub XPropertyChanged() Handles Y.X.PropertyChanged
Right now I need to create a object that equals the object inside that object and then handle this variable pointers property changed, but that is just annoying.
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Aug 4, 2009
I want to assign an object property by referencing the property dynamically, with a variable name
i.e.
dim propName as string
staticObjectName.propName = 'whatever
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Nov 21, 2011
I'm checking If a border's child property is not set to nothing or equal to a given element, but whenever I run the program, it says that it's set to nothing and crashes. Here's my code:
If Not Me.Child.Equals(Nothing) Then ...
If Me.Child.Equals(value) Then ...
Both gives an error. What should I do to pass these lines? Also in C# it would look like this:
if(this.Child != null) ...
if (this.Child != value) ...
But this time it doesn't give an error.
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May 1, 2009
When I right click on the ToolBox and click on Choose Items Error while loading property page comes up, and my toolbox is disabled, Also in the output this text appears:The Windows Forms Designer Package ({7494682B-37A0-11D2-A273-00C04F8EF4FF}) did not load because of previous errors. For assistance, contact the package vendor. To attempt to load this package again, type 'VBExpress /resetskippkgs' at the command prompt.
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Oct 12, 2011
I have a vb.net asp application where I'm loading a control (from another control on a page). I want to set a variable between the two controls when it loads. This is where I load the control:
[Code]...
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Sep 19, 2011
I just recently learned about the uses of static local variables in VB.NET and wondered about it's potential use in lazy loading properties.
Consider the following example code.
Public Class Foo
Implements IFoo
End Class
[Code].....
As far as i can see, this has a few advantages over the usual implementation, primary your inability to access the variable outside of the property, as well as not having to use an additional variable.
My question to you is: Which of those is the "right" way to do it? I know that static variables have additional overhead, but is it bad enough to create, in my personal opinion, unclearer code that can be misused easier? How much performance do you lose compared to the "traditional" method? How does it matter for small classes compared to huge factories?
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Apr 14, 2010
During Loading a form, I bind a datasource property of the DGV to the bindingsource, and then set the fillweight property of the DGV columns. But, after form being shown, earlier set properties are being reseted to default = 100.
The procedure is like:
1. TestForm.Show()
2. TestForm_Load(...) Hnadles MyBase.Load
DGV.DataSource = bindingsource
DGV.columns(0).fillweight = 80
DGV.columns(1).fillweight = 120
3. Me.close() (Closing the form which called TestForm.Show()
And now I have visible a TestForm with well binded datasouce seeing all the columns, but their fillweith property was beeing reseted...
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Apr 28, 2009
im trying to load a database and I get this error.
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Sep 3, 2009
After reading all the examples for list of T exists and Find and find first, none show how to handle multi-property objects. Below is bare bones example maybe someone could flesh out to show how this should be done.
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim DatePriceList As New List(Of DateAndPrice)
DatePriceList.Add(New DateAndPrice(Date.Parse("1/1/2000"), 10.12))
DatePriceList.Add(New DateAndPrice(Date.Parse("1/2/2000"), 11.12))
[Code]...
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Feb 21, 2011
I have the following property in a property grid in VB.Net 2010.
<Description("Rapid Entry Post Car Wash Settings CarWashOptionPushButtons"), _
Category("Post Car Wash")> _
Public Property CarWashOptionPushButtons() As String
[code]....
I need to make this property a list box that gets the values from a database table and populates the list box with the values from the table. I have tried numerous things to no avail.
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Dec 22, 2010
[code]I understand the error is saying I've got a null pointer reference happening, but I don't understand why.
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May 19, 2012
I have a qeustion where i made a function that changes the property value of an object. the objects + alias are stored in an array (Objects()) , if the var (NewValue) has a value then it checks the property type and converts the Newvalue and inputs it.
[Code]...
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Mar 9, 2012
I'm currently writing a HMI for an automated machine in VB.Net 2010. I have a custom class that turns a Border green or red depending on the value of an input on a remote I/O module.
The connection to the remote I/O module is through a COM object provided by the manufacturer. I have three remote connections, lets' call them g1, g2, and g3. They're of type Manufacturer.ConnectionObject.
I would like to specify, using a property that I can set in XAML, that instances of MyCustomBorder use g1, g2, or g3. Unfortunately, setting up a Property called g and typing 'g1' into the property field results in the message "Property value is not valid. Details: Property 'g' does not support String to Value conversion."
[code...]
I need to implement a converter between String and the custom class, Manufacturer.ConnectionObject, but I have no idea how to accomplish this, especially since Manufacturer.ConnectionObject is part of a closed-to-me COM object.
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Aug 26, 2009
I want to create a class that inherit from a polygon this is not possible because the polygon is not inheritable. I want to create a class that handle a polygon anyway and it behave like a polygon. Wile with the property i can pass the value from the class to the polygon but if I want to do something like
[Code]...
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Oct 20, 2011
Is it possible to handle a property as an object?I want to reach a property as an object , not through its owner.
Dim prop as object = UNKNOWN_FUNC(btnTest.Text)
prop = "New text of btnText.Text" '
I want to modify Text property of btnTest by this way..
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Jan 6, 2012
I want to do translation recursively on all components in my form. So my function will start on the form. Before the recursion, it's obvious that I have to know what property containing the children that the current Object has.[code]...
The method I want to use it, I will check if the current object has property Items if not, check if it has property Tabs, and so on... Then the last fallback, check if it has property Controls.
Now the very question how could I check if the current object has specific Property?
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Jul 10, 2010
I am creating a procedure and would like to know if I can pass the name of a property. I.e ComboBox1 so I can change the properties of that object. What I have done is create a procedure to populate a Combobox from my MySQL database. What I want to do now is populate the relevant Comboboxes without having to create a new procedure specifically for each combobox. I can create a procedure for each Combobox but the whole reason for procedures and functions are to minimize repetitive code and to make code easier to manage.
At the moment my procedure is ProcedureName(ComboBox1, "DatabaseName", "DatabaseField").
What I want to be able to do is do
ProcedureName(ComboBox1, "DatabaseName", "DatabaseField1").
ProcedureName(ComboBox2, "DatabaseName", "DatabaseField2").
ProcedureName(ComboBox3, "DatabaseName", "DatabaseField3").
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Feb 15, 2012
I'm a C# coder, and I have trouble even reading VB.NET, so please forgive what may turn out to be an incredibly dumb question. But I have some code which looks like this:
CODE:
So, ignoring the fact that the syntax is probably wrong - how does VB.NET get the Name property from sourceObject? Inspecting it at run-time reveals that sourceObject is of a type that supports a property called Name with a getter, but what does VB.NET do in this case? Is there some extra code that is being generated by the compiler to somehow cast this automagically at run-time?
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Nov 3, 2010
i have a sortedlist variable called :
Cart
which contains two Cartitem object and within these two objects is a further object called Product.i wish to amend the Product object Property named Quantity
["860"] = {Cartitem}
["861"] = {Cartitem}
When i attempt to update the Cartitem object using the key value it overwrites Cartitem to Product.
Present Update
Cart(key.ToString) = product
results in
["860"] = {Product}
How may i update a Product property without replacing Cartitem object to Product?
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Feb 22, 2012
I found C# code for it here. So I tried
Public Function checkProperty(ByVal objectt As Object, ByVal propertyy As String) As Boolean
Dim type As Type = objectt.GetType
Return type.GetMethod(propertyy)
End Function
But it throws an error at type.GetMethod(propertyy) saying "Value of type 'System.Reflection.MethodInfo' cannot be converted to 'Boolean'."
What to do?
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Mar 23, 2012
When I execute this subroutine it throws an error,
"The value of a property that is part of an object's key does not match the corresponding property value stored in the ObjectContext. This can occur if properties that are part of the key return inncosistent or incorrect values or if DetectChanges is not called after changes are made to a property that is part of the key."
Here is the code and below it I've explained briefly what the code does.
Protected Sub btnUpdate_Click(sender As Object, e As EventArgs) Handles btnUpdate.Click
Dim semester As String = ddlwhSemester.SelectedValue
[Code].....
The above code is used to pull records from a SIS (essentially a higher ed CRM) into my webHousing application (for on-campus residents). It gets a list of everyone who is a student for the select semester/year and then inputs them into the webHousing database if they don't already exist for that semester/year.
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Oct 31, 2010
On form1 I put a picturebox from the toolbox.[code]Is it possible to set picturebox.visible=true of the inherited picturebox?
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Apr 29, 2009
We have an object with properties, and a a SQL database we're reading in, to create a list of objects, with columns corresponding to each property.if a column is missing from the database (e.g. caused by an outdated version of the database), we want to assign a default value to it.I've created a dictionary, mapping the column name to its default value (both strings).However, I was wondering if it was possibly to somehow convert the column name (string) to an object property (e.g. the string "name" to AnObject.name?), as the property and column name are generally the same.I tried to use GetType().GetPropert("column name"), but I can't seem to do assignments through that)Alternately, is it possible to somehow create a dictionary, storing the object property as the key (and the column name and default value in a struct), and then grabbing it after.?
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