C# - Better Pattern To Handle Nested Code Conditions?
Oct 28, 2010
I have a webpage that needs to selectively show or hide a substantial number of controls. Each control's visibility is determined based on which of 3 conditions are true.So, for example, given the conditions A, B, and C;
Control1 needs to be visible only when A and B are true and C is false.
Control2 needs to be visible only when B and C are true and A is false.
Control3 needs to be visible only when A and C are true and it doesn't care what B is.
and so on...
If each control looked at every condition, the control logic would be ugly, but doable.
[Code]...
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Aug 27, 2009
I have an RDLC report that I am rendering directly to the Response Stream as PDF (rather than using the ReportViewer). In the code that renders the report, it's DataSource is bound to a List(Of ClassA) objects defined in a custom assembly. This seems to work for the most part. My problem is that I can't seem to handle the situation where a nested object is null. For example, given ClassA and ClassB (the nested object) defined as follows:
Public Class ClassA
Public Id As Integer
Public Name As String
[Code]....
the report displays "#Error" if TheNestedObject is null. If TheNestedObject is not null, it correctly displays the Name.
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Sep 25, 2011
I have been programming an activation type of security protection for my software but i ran into problems when i try to generate an alphanumeric key with conditions. i cant seem to be able to make the keys to be valid with the condition.Basically i can get the 25 keys but all of them seem to be returning 1(ones) instead of 0(zero which what i want. below is my sample code may be someone can tell me what i am doing wrong, by the way i did google, woogle,bing, bang, yahoo, yadoo etc but no go.
generate the keys
Public Function GenerateCode() As Object
Dim IntRnd As Object
Dim IntStep As Object[code]....
the damn thing keeps returning 1 instead of 0. I do know i can simply change to 1 and be off the issue. but if is that easy to generate 1 the isnt easy just to break it. oh yeah the whole thing hangs when i generate the code? if i loop it, its able to get a 0 but i cant take the key thats in the loop?
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Apr 23, 2011
I am trying to make a webform that will act as a "wizard". My problem is how to get the program started e.g. I want to ask the user a question and have them choose a radio button, then have them click a next button. when the user clicks the next button I want to use the radio buttons as a condition so for example if the user selected the "yes" radio button then the program will display some new labels and textfields or radio buttons and so on.
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Apr 22, 2009
I have text like following example
XXZZXXXZXXZXXXXZZZZZZXVVVVVXZVZ
and also I have two patterns like XX and ZZ I want to find longest possible string which include above given two patterns and return starting and finishing index of the array.
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Jun 10, 2011
I need A free source code for pattern matching(finger print matching) .
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Nov 6, 2010
Anyone here kind enough to give me a code review on the following pattern that I have used for database access? I have provided one of the simpler datalayers to show the basic idea.In particular I am starting to question if using shared methods was a good idea and what problems may arise from that? Will this implementation fail in a threaded environment like ASP.Net?
Public Interface IFillable
Sub Fill(ByVal Datareader As Data.IDataReader)
End Interface
[code].....
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Jul 7, 2009
In teh MVC design pattern, Controller is strongly related to the view (GUI). IN my application i need to generated a new BrandID, i used stored procedure to retreive the highest BrandID from teh DB (The model calls the stored procedure and sends the retreival value to the Controller), then in the controller increments the BrandID by "1" to create a new brand ID. SInce, controller is strogly related to "view", should i include this "brandID increment" part in teh controller or in the model classes?
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Jan 19, 2011
Anyone here kind enough to give me a code review on the following pattern that I have used for database access? I have provided one of the simpler datalayers to show the basic idea.In particular I am starting to question if using shared methods was a good idea and what problems may arise from that? Will this implementation fail in a threaded environment like ASP.Net?
[Code]...
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May 3, 2011
One of the problems that I constantly see with Winforms applications is that the GUI thread is stuck while a long-running task is running or just plain stops refreshing (yes, I know - needs threading). Is there a code template/design pattern I can use when reacting to mouse clicks or button presses? Should there be a processing thread always running in the GUI app? Basically, how do I write a great Winforms Application that is easy to maintain and doesn't have any quirky refresh bugs?
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Oct 4, 2009
is it possible to add some VB.net code to handle all the errors in my application. (and not to go in each sub and add the on error intruction) I want to handle every error.
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Mar 30, 2011
I need to round and print a price like below, but this does not handle null values.How can I handle null values on one line of code? DBRSet is an SQLDataReader and the price is money
<%= Math.Round(DBRSet("price"))%>
I have about 200 .aspx pages of this so I could also use some tips on how to change these in an easy way? Can I do a search and replace with a reg-exp or something like that?
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Feb 23, 2011
I have written some C/C++ code that uses the winapi functions CreateFile WriteFile SetFilePointer etc. to read & write some large (>4 GB) binary files. Some colleagues who are more familier with Visual basic than C, want to modify some of their existing code to call my C code functions.
I have turned my code into DLLs that I have successfully called from other C programs. I have also created a small C DLL that doesn't use the winapi functions & called it from a small VB program.
What I haven't so far been unable to do is pass the HANDLE type variable between a C function that uses the winapi functions & the VB program that call it so the VB can call another of my functions & pass the HANDLE.
In my attempt to do this, the declarations in the header file for two of the functions in the C DLL are:
[Code]...
When I step through the VB code in debug mode there is no problem with calling OpenSegyRW, but at WriteToSegy I get the error message:System.Runtime.InteropServices.MarshalDirectiveException was unhandled
Message=PInvoke restriction: cannot return variants.So what am I doing wrong & is there any way to pass the winapi HANDLE type between VB & C code? BTW indents etc. get lost when I paste my message into the forum. I hope this is decipherable.
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Sep 24, 2010
so far i got
code
For Each item As Reflection.FieldInfo In GetType(NameSpace.ClassWithNestedClasses).GetFields
rtfAppend(item.Name & ":" & Tab & item.GetValue(Me))
Next
For Each item As Reflection.PropertyInfo In GetType(NameSpace.ClassWithNestedClasses).GetProperties()
[code]...
which gets me the simple string vars and properties of my top class, but how can i apply this to loop through all sub classes and get there vars and props?
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Mar 17, 2009
add a code to handle the TextChanged event of my Textboxes to clear the Result box.
Private Sub btnCalculate_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click
txtResult.Text = txtRate.Text / 100 * txtAmount.Text * txtYears.Text
End Sub
[code]....
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Aug 22, 2011
code:
<span>Public Structure UUID
Public Data1 As Long
Public Data2 As Integer
Public Data3 As Integer
Private m_Data4() As Byte
[Code]...
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Feb 18, 2010
I have a nested master page that has its own master page. The parent master page has a property defined in its code behind.
Public ReadOnly Property SelectedPage() As String
Get
Return _selectedPage
End Get
End Property
How can I reference the parent master page's property from within either the child master page's code behind Page_Load or aspx template page?
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May 19, 2011
I'm trying to extract all rows from a datatable where "CODE" follows the pattern "Z##A". I tried the following to no avail:
Dim floods() As DataRow = arqTable.Select("mid(code,1,1)='Z' and isnumeric(mid(code,2,2)) and mid(code,4,1)='A'")
An error returned "The expression contains undefined function call mid()."
I could go through the rows using a FOR EACH loop but I'm just curious if there is a way to simply use the datatable select function. *Edit: BTW, using "code like 'Z%A'" is not going to work as I'm specifically looking for Z[number][number]A and not ones with Z[letter][letter]A.
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Mar 23, 2009
I wrote an application to handle a joystick with directinput. It works fine if it uses the handle of the main window but it doesnt happen the same if the handle is the one of the component that contains the joystick's operation.
I mean:
main form handle: 15
component handle (which is inside the window and the joystick needs the focus of this component to work): 25
It always work if the handle i initilizate the device is the main form (15).How can i use only the handle of the component?
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May 10, 2009
Public Class Inventory_Edit
Private Sub Inventory_Edit_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'CategoryDataSet.Category' table. You can move, or remove it, as needed.
Me.CategoryTableAdapter.Fill(Me.CategoryDataSet.Category)
[URL]
I added an "edit" icon on my bindingNavigator. When users click on it, a new form will come out and pull out all the data records from the datagridview. Now the strange thing is that when I wanted to edit the data records, when I left the product name blank, I would get an error message saying "Product cannot be blank" - please see above code. But when I left the "Cost Price" blank(same applies to "Sell Price" and "Quantity"), the error message box wouldn't come out, instead, it did not allow me to move on to another textbox, close the form etc until I filled out that textbox with INTEGER. May I know why the error mesagebox would not come out when I entered the wrong datatype?
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Oct 11, 2011
the testBoolean is set to the value True, but for some reason when debugging, it step through both conditions, so in the end the button1.visble becomes False, but I want it to be set to True.[code]....
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Feb 1, 2011
I am very new to vb, I know there is an error somewhere, I had an assignment which stated that if a number was < 101 or > 500 and the answer is correct the output should be, for example-123, if the answer was wrong then the message output should be wrong number <101>500. Everytime I type in a number(no matter what the number) and click on my check button I get the output message. If at all possible, can you please assist. My professor gave the following example, but I am still not getting it:
Dim strInteger As String = "52.801"
Dim dblNumber As Double
dblNumber = CDbl(strInteger)
[code].....
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Jun 20, 2012
I want to use a value that is pulled from the SQL within the if statement. Ideally i want to do the equivalent of <% If DataBinder.Eval(Container, "DataItem.BookID") == 1 Then%> Is there a way to do this with the correct syntax?
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Jun 21, 2010
How to combine these two conditions in one section
Private Sub DataGridView1_CellValidating(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellValidatingEventArgs) Handles DataGridView1.CellValidating
'condition 1
' check given value is numeric or charactr type
If e.ColumnIndex = 3 Then
If Not IsNumeric(e.FormattedValue) Then
DataGridView1.Rows(e.RowIndex).ErrorText = " must be a numeric value"
[Code] .....
'condition 2
' check given value is greater than 0 or not
If e.ColumnIndex = 3 Then
If (e.FormattedValue.ToString = "0") Then
[Code] .....
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Jun 6, 2011
I have and existing .rdlc file where I display the grades of each students as well as the general average. I get general average like
=FormatNumber(Switch(Fields!YearLevel.Value="LC7" or
Fields!YearLevel.Value="LC8",(IIF(Fields!SectionName.Value<>"1st Sec A" and
Fields!SectionName.Value<>"2nd Sec A",
[code]....
I want to display:
"1st Honor" if gen. ave is >=90 but all the subject grades must be >=90 also
"2nd Honor" if gen. ave is >=88 but all the subject grades must be >=88 also
"Third Honor" if gen. ave is >=85 but all the subject grades must be >=85 also
How do I do it?
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Dec 9, 2011
So I am trying to evaluate 3 conditions in an if statement. Its not working how I would assume it should. I basically want to do this:
vb.net
If PGN = &HEF007E And PGNData(0) = &H58 And (PGNData(1) And &H40) = &H40 Then IgnOn = True Else IgnOn = False
If I write it in that manner it gives inconsistent results. If I workaround by writing it this way it works perfectly:
vb.net
If PGN = &HEF007E And PGNData(0) = &H58 Then
If (PGNData(1) And &H40) = &H40 Then IgnOn = True Else IgnOn = False
Endif
What is the proper way to do this with only one if statement?
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Jun 8, 2011
Having problem make last if an statement work in the code. the variables in the if statment are doubles but the ide keep telling i need a proceeding if statement. but is already there it is in the last if statement of the code
Public Class Form1
Dim Totals As New List(Of Double)
Private Sub btnclear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles
[CODE].....................
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Feb 15, 2012
I'm doing a stock Control System as a school Project using An Access 2007 DB and Visual Studio 2010. I'm trying to do an update Query based on two variables entered into comboboxes, I cannot get the VB to accept the conditions for this, Can anyone Help me?[code]I Cannot get the Code to recognise the Last "'", is there a way to do this?
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Jul 28, 2011
The following code is looking for the phone number of contacts in a database when the column "hoohoo" = 15. However it doesnt keep to this condition, but displays all of the numbers. Am i missing a line that tells it to keep to the condition???
Dim SQL As String = "SELECT *, Phone FROM TblContacts WHERE Hoodoo=15"
Dim myOleDbCommand As New OleDb.OleDbCommand(SQL, con)
con.Open()
[Code].....
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Feb 18, 2008
client2 so like this my treeview has be displayed.i can able to display the value in my treeview.my requirement is i need to keep image for the treeview nodes. for example Group1 - sample1.gif server1 -sample2.gif client1 -sample3.gif so i need to keep images to this nodes at run time and i need to chage the image depeds on my need. for example in some situation i will keep sample2
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