In an upcoming project I need to keep track of some fractional data values. Due to industry standards around the products which this data describes, it is important to display the fractional value as a fraction and not as a decimal; yet for purposes of sorting and filtering the data values, the decimal value of the fraction should be known.
The obvious solution since the problem describes data is to store the value as both a string-fraction and as a decimal-value. This works fine, but it does leave a disconnect between the two values, when in fact, they represent the same data.Assuming that this project will also include a strongly typed object model, which will likely drive a EF4 Code-First database, I think that the best solution involves creating a custom fraction type which can encapsulate the string and decimal values.
After thinking on the problem and some experimentation, I've come up with the following structure to meet this need, however, I'm not certain that it is the all-around "best" implemenation.Obviously "best" is a subjective term, but in general the type should be well-rounded for as many uses as possible... idealy as generic as the Decimal type it enhances. Can anyone spot any flaws or drawbacks with this implementation? I'm still not sure about the numerator and denominator fields... whether they should be readonly or priviate or what...
As a part time CAD drafter I commonly have to do scale conversions from many different scales.I am writing a scale converter that will allow me to enter the source scale (eg. 1/4" = 1'). Then it will provide an area to enter another number, like 3/4", and then produce that number in inches. In the case of 3/4" it would equal 36" or 3 feet. For now it would be fine if only gave me the answer in inches.How would I handle all the necessary fractions? Would I have to set up a bit of code that would convert the fractions to decimal?
Public Class Form1 Dim intResNum, intResDenom As Integer Private Sub btnMult_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnMult.Click
I recently found myself in a thread deling with convertions from decimal number to fractions... Being a bit too brusk and dismissing the idea at first.I have now implemented a structure based on code frm Javelia whithc can be seen in this thread.Solitare also proveided code that I eventually understood and was working.[URL]...it a step longer and developed a structure that can also implement calculating with fractions... My first try is also posted in the tread above...
The implimentation is far from perfect, as it does not deal with POW of fractions.. So if anybody has some ideas on hoe to do this with squer root and all pleas let me know and Ill update the code..
I get some funny display errors when I attempt to pop a fraction into a text label.[code]Do I get 33.3% here? No, but I get 33.333333333333 - etc - depending on how big my label field is Plus I also get an error message trying to add the % sign at the end.how to round off and display fractions and percentages in a Label.Text field?
I have a DataSet with a DataTable that has several numeric columns of Data. The numeric data is composed of distances given in U.S. Standard units. I currently have my ComboBoxes set up and working, but I need to expand on what I currently have in two ways.I need to be able to convert the Decimal numbers in my data column being displayed to Fractions, is there a way to do this and maintain databinding? In this case its the Display Member of the data source...I need to be able to display my drop down options in different sets of units... I've written Unit Conversion classes to help take care of this, but I don't know if I can somehow do this as well and maintain databinding? I'd like to convert the units on the display members as well...
Private Sub ComboBox1_SelectedIndexChanged(sender As System.Object, e As System.EventArgs) Handles ComboBox1.SelectionChangeCommitted Select Case ComboBox1.SelectedItem
[code]....
What is the best approach for using ComboBoxes when dealing with issues such as displaying fractions and units...
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?
Possible Duplicate: Can .NET intercept and change css files?
I have configured IIS6 to get .NET to handle css files.I did the following steps
Launch IIS Manager Right-click on Default Web Site Click on the Home Directory tab Under Application Settings click on Configuration.Add a new association for .css and map it to .NET executable:
How can I check if this is working, i.e. I want to change the default style of a page depending on the url, i.e. if the referer url is http://intranet, it should continue to use the old existing style style1.css, if the referer url is http://intranetv2, it should use the new style style2.css.
I am trying to get a handle on the correct way and easiest way to do things. By easiest I am not talking about being lazy just accessing and modifying later on. I have started using my own classes and such but I have a few questions. Sometimes I want to create a control on the fly through code instead of using the designer. Should I create this control in the main form file or in a separate class? If I make it in another class it seems harder to access later on. Then again if I dont know that the control is going to be created(user clicks a button to add a control) how can I access it? Also it seems alot harder to access certain things when it is in another class. For example if I create a new window in a class and then want to check if it is there or not it is alot harder to do.
I need the intPtr for a form. Control.FromHandle(control) gives me the control from a handle, but I need the opposite--get the handle from a control. How do I do this?
I am trying to create a small utility that tracks desktop usage in detail, to the level of individual text boxes etc.... in other applications. However, it is proving quite tricky. I thought I had it nailed using the Windows api. The below code is just a snipet of the code but essentially it provides me the handle of the control that the mouse is over. I thought from here, it would be easy to to the same thing but to provide the handle of the control that the cursor was actually clicked on, for example, if someone is filling in a text box in an application, they would not necessarily move the mouse to get to the text box, they may tab to it. Does anyone know if there is a way to get the handle of the control that is in use?
Private Sub Timer1_Tick(sender As Object, e As System.EventArgs) Handles Timer1.Tick Dim ptx As Integer = Cursor.Position.X Dim pty As Integer = Cursor.Position.Y
I am going mad about getting the process id for one existing handle on VB2008.I tried both GetWindowThreadProcessId(hwnd, pid) and GetProcessId(hwnd), while PID always returns 0, I tried the same things in VBA of Excel, it works perfect, so this is somewhat weird,
I have referred DLL in my project. I have to handle the event from DLL in VB.net code. I guess we can do using WithEvents. Can you give me complete picture?
I am having a SP run in my VB application every 10 seconds to check for any new rows that have been inserted to the database since the last check. What is the best way to do this? Most likely it will be 0 or 1 rows, but I am afraid at random times it maybe more than 1 and so I thought I would fill it in a DataSet, but I came in here to see if there are any other better ways. If dataset is the best way, how do I do a For Each Row in the dataset to process some VB code for each row?
I read stuff from a SQL DB (database) using a data set. Some of the columns in the DB may contain NULL. I want to go through the table in the dataset and print, or use in some other way, the data. But when I try to use a certain data that corresponds to a NULL in the DB my program crashes.How can I detect - in the dataset - that it has no value and that I shouldn't try to use it?
Private Sub Get�rendenLista(ByVal e As System.EventArgs) '---------------------------------------------------------------------- ' This function fetches a list of �rende from the table �rende '---------------------------------------------------------------------- Dim cno As New SqlConnection
The short program below runs just fine when it is the only item on a form. However, when I put it into the ItemInsertTemplate of a ListView control, I get the following message:
Handles clause requires a WithEvents variable defined in the containing type or one of its base types
Line 30: Protected Sub btnDate_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDate.Click
The error message identifies Line 30 as the problem.I get the same message for Sub clnEvent_SelectionChanged How do I correct this?
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="clnControl.aspx.vb" Inherits="clnControl" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server">
Does anybody know if there is an API function that would let me cancel a print job.I already know how to get a handle to a printer and how to enumerate the print jobs using the printer handle.
how to make VB handle my associated files.I made a program that opens fine when from the EXE file. But however, when I try to open it from the associated file, it behaves the same way as if opened from the EXE.So, where (in what method?) do I tell VB how to handle those files?
I have several installations of my Linq-to-Sql app running in the field. Now I've created a new version, which adds a new column to a certain table. I've added this column in the dbml file. But when updating the installation, I want to preserve the existing database. How to handle this? Linq-to-SQL doesn't seem to like this inconsistency.Is there an easy way to update the existing database using my new dbml file?
my computer model has an eject key on top of it (touch sensitive), this handles the CD ejecting. But Windows doesn't native support this button, and I have to use Dell QuickSet to use this button (otherwise it does nothing). I need to hook onto this key and eject the CD Drive when it is pressed (I already have the ejecting and the hooking done). But I have no idea how to detect this key? There is no key in the key list for VB.NET, and I don't know what the eject button sends (Numerical wise) so I can't handle it that way. Does anybody know how to handle the eject key?
I am making a vb.net program that calls several other subprograms. None of them effect the other.If there is an error in 1 of them, how do you record the error but continue on to the next subprogram with out stopping everything ?
I was working on a project in my VB.NET Express and suddenly my code that was working fine and starting up as normal gave me this error:
{An error occurred creating the form. See Exception.InnerException for details. The error is: Corrupt .resources file. Got an unexpected EndOfStreamException while trying to read the ResourceReader header.}
When I'm trying to run my application, it doesn't open my main form.
