Iterating Over All Properties In A Given Type In .Net
Jun 19, 2009
If I have a complex structure which contains properties which are both simple and complex types, how can I iterate over all the properties of this structure and any child properties which are not simple types?
I have a complex type called file, which contains lots of string properties and some which are other complex types which contain similar structures, eventually the whole structure breaks down into strings.
At the moment my code looks like this:
Dim file As New File
Dim props() As PropertyInfo = file.GetType.GetProperties()
_propList = New CheckBoxList
[Code].....
This works, but it is ugly and I am not at all happy with certain chunks, specifically the type comparisons to establish if this is a date, string, decimal or boolean which are the potential low level types which I want to get out.
In C# it would seem these type comparisons are easier, but i seem to have to create an instance of a given type to be able to use GetType to return its type.
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Oct 10, 2011
First of all sorry for any grammar mistakes, english isn't my native language.I need to cycle through all the elements in my panel (full of "ImageBox") and change their images.
My code so far:I declare an array with my objects.
Dim OrdenCartas() As Object = {Ardilla, Ardilla, Cangrejo, Cangrejo, Morsa, Morsa, Oso, Oso, Pato, Pato, Pinguino, Pinguino, PinguinoPaleta, PinguinoPaleta, Serpiente, Serpiente}
Then I call this method (I have doubts in this one)
[Code]...
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Sep 11, 2009
In VB.NET, if I create a class it is a reference-type. But, if that class it chock full of value type properties, how is this handled? If the class is instantied but never filled, I suspect a pointed for to the heap is allocated. But is more space allocated on the stack for all of it's value type properties?
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Aug 31, 2011
I wanted to define a property which accepts decimal numbers and do some process on the value and return string such as the below:
Public Property Amount() As String
Get
Return Utility.PaddingRight(Me.msAmount.ToString(), 10)
End Get
[code]....
But compilers warns "Set parameters must have the same type of the containing property."It doesn't look like it should throws an error since it looks legit.
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Feb 12, 2010
I am trying to figure out how to get at an anonymous typed object's properties, when that anonymous type isn't created in the current function.
Specifically, I am binding an ASP.NET ListView to LINQ resultset, then trying to process each item in the ItemDataBound event.
Option Explicit On
Option Strict On
Class MyPageClass
[Code]....
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Mar 19, 2012
How 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?
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Oct 6, 2010
i need to do something as the old scholl on vb6, create a control array, i need to put 50 listviews controls and when the form is initialized start asigning properties since i will drag items to each one of those grids, im goin to make a dragdrop event to handle all the 50 controls, dont like the idea of adding handles c1, c2,cn, c50 but whatever, is there soemthing easy to create a routine to change properties and add columns to each one control dinamically?
sample
for x=0 to 50
control(x).property = true or ""
next
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Mar 15, 2012
How to get Hardware properties in VB Express 2010 like video card name and memory type?
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Dec 16, 2011
I'm learning LINQ and VB and just spent an hour trying to access the fields of an anonymous type defined in a linq query. The key (I learned) is to convert the query to a list before you try to iterate through it with a for loop. How to access property of anonymous type in C#?
This does not work: edit (this compiles, but intellisense does not recognize the type)[code]...
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Dec 13, 2009
Each time I create a program, if I don't change the CPU type to x86 in the Project Properties, Compile, Advanced Compile options, it doesn't work. For example, if I hit the drop down button on a combo box, there will be no data, but after switching to x86, there is data. How does changing the CPU type affect how others (such as when its being graded) view the program? If the program is not run on an x86 system, would it appear to not work then?
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Feb 24, 2011
I have an XML file, with a rather large structure. I'm pulling several entities out of it throughout several systems, and its dynamically updated once a day. I'm using a Linq Query that is exhibiting odd behavior, its only returning if the first entry in the site tag matches the search-pattern. If its number 2 or 3, it fails to return anything. Why would this behave that way?
The following function written in VB handles pulling the data
Public Function xmlSchoolListBySite() As IEnumerable
Dim doc As XDocument = loadXML()
Dim loadedPrograms As IEnumerable(Of XElement) = From c In doc.Descendants("Organization") _
Where c.Descendants("site").Value = MySite.Site.s_Url _ 'contains Result.RawURL.tostring() formatted
Select c.Element("Title")
[Code]...
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Jun 24, 2011
I am trying to write XML that looks like this. It works so far, but when I get to the <rooms> node I can only output one.
<house>
<id>1</id>
<rooms>Living</rooms>
[code].....
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Jan 5, 2010
I have two arraylists that contains links in one and the root url in the other. Sometimes the lists dont equal in number and I would like to iterate through the links list and if it contains a matching root url add it to a third list but also avoid any duplicates. I tried this but am not getting consistent results.
For Each link As String In urls
For Each part As String In post
If part.Contains(link) Then
[code]....
Perhaps there is another way; basically the part in post is a link to a page and contains the root url( which is link in urls). After extracting all these I need to ensure the 2 lists match.
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Feb 10, 2012
I am iterating through rows in a datagridview in the following manner
[Code]...
Why are the column methods and properties not all available in this manner to set individual datagridview cells properties? The only options available for the variable,
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Mar 26, 2012
I have several label boxes on my design form that all share the naming convention lbl_#.text where # ranges from 1 to 60. I want to make a loop that iterates through each lbl_#.text adding some incremental value, let's say multiples of 2 for this question's theoretical purpose.Something such that the end result would amount to the following:
lbl_1.text = "2"
lbl_2.text = "4"
lbl_3.text = "6"
lbl_60.text = "120"
I'm not sure how to access each of these labels through the coding side, I only know how to explicitly mention each label and assign a value :/
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Mar 19, 2012
I am writing a simple XML web service and want to return raw XML. I am doing this by creating a string literal that represents the XML. My data source is a SqlDataReader object that contains the results of a stored proc call. The way I am doing it right now is by using a while loop and reading values from the item property like so :
[Code]...
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Mar 1, 2010
I have a list like this
[Code]...
How can I iterate the list with ForEach to get one string with the emails like this [URL]
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Jan 16, 2009
Can somebody show me how to loop through days between two DateTimes in VB?
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Jan 5, 2012
I have a structure "xyz" with 3 string objects in it. "foo" "bar" and "abc" I want to iterate through the structure and compare the names of the objects.
Structure xyz
dim foo as string
dim bar as string
dim abc as string
End Structure
[code]....
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Mar 4, 2009
I have an asp program that needs to validate data for textboxes that are dynamically created and put into a placeholder. Each textbox has to have a value when the user hits the Save button. I have the following code:
Dim testCheck As Boolean = True
For Each txt As TextBox In pnlTests.Controls
If txt.Text = "" Then
[Code].....
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Jan 5, 2010
I have two arraylists that contains links in one and the root url in the other. Sometimes the lists dont equal in number and I would like to iterate through the links list and if it contains a matching root url add it to a third list but also avoid any duplicates. I tried this but am not getting consistent results.
[Code]...
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Apr 19, 2009
I'm new here, but I always exhaust myself in research before I go asking for help with my code. What I'm actually doing is porting a program I wrote in AutoIT proprietary code over to vb by hand. I've really come far and have figured out out how to read/write data to an XML file, which was the biggest challenge. I'm having a little bit of a rough spot with iterating nodelist data and then adding it to a listview in order.Here's what I have within a sub that begins to pull data from the file.
[Code]...
This adds data a row at a time, which is what I want. But look at the data I'm feeding it, node.innertext.I have to iterate the specific nodelist before I can use node.innertext. Putting .subitems.add in the iteration just results in a huge mess. I thought about using a function to return the data and then drop the function name in there, but whenever I iterate within the function it only ever returns the first item (it iterates only once even though there are more than one interations). Hopefully someone can point me in the right direction, I don't need to be spoonfed the answer.
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Dec 26, 2010
I want to do something different on the last KeyValuePair of the Dictionary I'm iterating on.
For Each item In collection
If ItsTheLastItem
DoX()
[code].....
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Dec 17, 2011
How do I go about looping through all the controls within a container, and all the controls in the container of a containing control, and so on.
[code]...
The following only retrieves -Panel and none of the other controlsFor Each cntrl As Control In Me.Controls Next How can I retrieve them all in a For Each loop without an If/Then for every level in the stack?
[code]...
This is so far the best method I found of doing this.
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Jan 28, 2012
I have the follow code in my program where I hit a SQLCe database to append the results into a list. That part works, but instead of exiting the function 'QueryDB' it goes to the else statement and runs the function again, which will return a null value. I designed it this way becuase I wanted to check to make sure the database is open before I try to execute the SQL statement, and if it's not open, call the method to open it and run through the function again.
[Code]...
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Oct 3, 2010
i have a problem. I have database with a tableadpater. i want to get the userid with this tableadapter.
Dim dsGN As New ForumTableAdapters.Message2TableAdapter
Dim dtBetrieb As Data.DataTable = dsGN.GetUserIdFromThisMessage(ConversationID)
For Each objRow As dsGN.Message2Row In dtBetrieb.Rows
mystring = objRow.UserId.ToString
Next
i get the error "dsGN.Message2Row is not defined" The Name ob my table in the database is "Message"
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Feb 15, 2010
I'm working on a VB.NET program that will automatically backup my work to my FTP server. So far I am able to upload a single file, by specifying a file name using this:
[Code]...
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Jul 1, 2006
I've got a panel (pnlExpenses) with several labels and textboxes on it. I want the program to go through the dollar amounts entered in the textboxes and put the subtotal in a class level variable (dcSumOfExpenses). However, when the debugger passes through this Sub, objControl always shows a value of Nothing, and the Count of pnlExpenses.Controls always shows a zero. What is my code missing? The panel was added to a tabpage at design time, and the labels and textboxes were laid on top of the panel. Do I need to do something more to establish the panel's controls as a collection?
Private Sub SumExpenses()
dcSumOfExpenses = 0
Dim objControl As Control
[Code]......
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Jun 27, 2010
I seem to be having some trouble finding anything to help me iterate through objects in an embedded resource file.What I have got, is a bunch of resource files that each have a library of sound wav files.What I'm trying to do is cycle through them all and add their name to something like a list box.I found a couple of snippets online that do this but for external resources. Here is what they do.
' Create a ResXResourceReader for the file items.resx.
Dim rsxr As ResXResourceReader
rsxr = New ResXResourceReader("Samples\Kicks.resx")
[code]....
1. It still needs a phisical file in the debug folder (I have them in a folder called samples within the debug folder.)
2. It gives me this error.QuoteResX file Could not find a part of the path 'C:\Users\sed10711\Desktop\Sequencer Interface\Sequencer Mock Interface\bin\resources\kicks\kickdrum1.wav'. Line 123, position 5. cannot be parsed.
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Jan 5, 2010
I have two arraylists that contains links in one and the root url in the other. Sometimes the lists dont equal in number and I would like to iterate through the links list and if it contains a matching root url add it to a third list but also avoid any duplicates. I tried this but am not getting consistent results.
[Code]....
View 2 Replies
