warinng message :- Access of shared member, constant member, enum member or nested type through an instance; qualifying expression will not be evaluated.
syntax: lblMessage.ForeColor = Me.f_Color.FromArgb(ds.Tables("Events").Rows(MNo).Item("Color"))
re: Access of shared member constant member enum member or nested type through an instance qualifying expression may not be evaluated I understand that this warning means that you should not reference a shared member via an instance. However, in my test case Test2.t.x("3"), I don't understand why it thinks I'm using an instance, since t is also a shared member. Also, note Test3. See what happens when you change declaration of GetObject() As Object to As Test3. I think I understand the behavior (not eval'd until runtime)
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I use .Net 2.0 on this one and i have a warning , i noticed that it runs over a line , here's the code:
Dim i = 0, y = 10
For i = 1 To 5
y = y + 100
Dim pic2 As New PictureBox
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'Warning 1 Access of shared member, constant member, enum member or nested type through an instance; qualifying expression will not be evaluated.
i changed a class variable to shared so i can access it in all instances of the class, but it caused an error. what is causing this, and how can i fix it?
Private
Shared img As Bitmap
Me
.img = bgImage
how do I overcome it? I have created a class and compiled into .dll This code
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In the following code i get a warning at line 59:Warning 1: Access of shared member, constant member, enum member or nested type through an instance; qualifying expression will not be evaluated.and.. At line 78 I get this Warning:
Warning 2 Property 'SelectedCustomer' doesn't return a value on all code paths. A null reference exception could occur at run time when the result is used.
The program compiles and runs well, but i cant' undesrtand the reason for these warnings. Any Idea ?
1: Public Class Form1
2:
3: 'Form level members
4: Private objCustomers As New ArrayList
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In the following
For Each <reference> IN <expression>is <expression> evaluated for each iteration of the loop? Specifically, if <expression> is costly to evaluate, would it be wise to evaluate it once before the For Each statement and keep the result in a local variable to use in the For Each statement?
Is there a way to change when an expression in a datacolumn is evaluated?
I'm trying to make a simple total function which sums the values of a particular column in a data grid. Normally the expression is evaluated when I leave from the datagridview, but I wish it to be evaluated when the row is changed.
I have a class with a static list of keys, and I have a static method called Remove() that removes a key from that list.Now what I understand from the contracts post conditions is that as the programmer of the class, I guarantee that the current public method does something specific, in this case : removing the element of the list.
Here's what I've written:
private static List<Keys> m_usedKeys; // private list of keys
public static void Remove(Keys _key)
{
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What I'm trying to "Ensure" here, is that the Remove() method removes the key for real from the list (Yes this might be a trivial example, but I get the error there.)when I write the Contract.Ensures() line, VS2010 gives me the following error :
Error 3 Detected expression statement evaluated for potential side-effect in contracts of method 'LibJungleTimer.KeyBind.Remove(System.Windows.Forms.Keys)'. (Did you mean to put the expression into a Requires, Ensures, or Invariant call?) C:UsersJoelDocumentsProgrammationJTJungleTimerLibJungleTimerKeyBind.cs 51
I think this error says that the expression m_usedKeys.remove(_key); has a potential side-effect. In fact, it has a side-effect, it removes a key from the list!If I try to write something like this instead :
Contract.Assert(!m_usedKeys.Any(x => x == _key));
well it compiles fine.
How to change the Data Gridview Button Back Color and Fore Color Based on Condition in Vb.net2005. i'm Attaching the gif toooo
View 5 Repliescreate a regular expression. It is a little like a search and replace, I want to replace any string that contains any substring in parentheses with the same string but the words in parentheses colored RED.
Eg Take this text in TextBox1:
"The Prime Minister (that idiot from Scotland) made a speech today"
and convert to this text in RichTextBox1:
"The Prime Minister (that idiot from Scotland) made a speech today"
just want to check whether i am doing this right,i am using visual studio 2008 and have inserted an expression in the backgroundcolor properties for one of the textbox in the table which is suppose to highlight the textbox accordingly. the expression is:-
=iif(fields!element1.value = "hello", "Red", "White")
but however, the expression did not seem to take any effect on the textbox and remain transparent.
I know that with some of the programs I use, when you click on an item to change it's color, the color dialog will actually show the current color and it's rgb value.
I'd like to do that in my application but can't find the answer on how you do it.
To change the backcolor on a textbox, the user double clicks the box and it shows the color dialog.
I think I have all the properties set right -- fully open to show custom colors etc.
BUT, it doesn't show the current color.
They all have 0 0 0 rgb.
I have a table, the color of the whole row depends on one of the two columns. Table: | ID | Name | Date | Ext Date |
Where Date color depend on the value, <15 is green, <30 is yellow and >30 is red. While Ext Date depends on value, >-14 is red, >-30 is yellow, <-29 is green and without Ext Date value will follow Date value.
I tried to put Switch in IIf but returns no color at all.
=IIf(Fields!countexten.Value="-",Switch(Fields!countdate.Value < 15, "Green", Fields!countdate.Value <30, "Yellow", Fields!countdate.Value > 29, "Red"),Switch(Fields!countexten.Value>-14, "Red", Fields!countexten.Value>-30, "Yellow", Fields!countexten.Value<-29, "Green"))
I have a product table which has around 90 columns in. Must of the columns are integers. When I search for an existing product and insert it into a row its fine but when I alter one of the columns and do an update using the command builder I get 'Expression Too Complex'. Does anyone know why this is happening and how to fix it?
View 4 RepliesI have a wierd problem with an Inputbox.Who I have not in VB 2003 and 2008. If I try this:
vb.net
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim result As String = Inputbox("Enter your username")
TextBox1.Text = result
End Sub
Then I've got this error:'Inputbox' is a namespace and cannot be used as an expression.Do I need to show an Inputbox in a different way than in vb 2003 or 2008.
i have some difficulties with a Regular Expression.I need to know if a certain string match a specific pattern.Only letter and number (a-z or 0-9) and must begin with a letter. No space allowed either.
View 2 RepliesI want to pass an optional parameter to a function of type System.Drawing.Color. The problem I am having is that when I declare the function it says "Constant expression is required" but I have tried variations of the following, including integers, full qualified indentifiers, even old vbWhite constants to no avail.
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I thought it would be fun if I could write vb.net or c# code at runtime and the interpreter would automatically parse it like python does it, so I made a little program, which would do something similar. Basically it looks like this:
InputArgs = Console.ReadLine()
ParseInput(InputArgs.Split(" "))
Private Sub ParseInput(Args as List(Of String), Optional TempArgs as List(Of String))
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I know it's not a good system, but it show's the basics. So my question is: Is it possible to make vb.net or c# like python - interpreted at runtime?
I would like to extract the word "date" from a string. It could appear as "DATE". "the date", "datee", "the_Date" or any other form
View 7 RepliesQuick question, of which the quickest and easiest answer may well be to rearrange related code, but let's see...So I have an If statement (a piece of code which is a part of a full working solution written in C#) rewritten using VB.NET. I am aware the VB.NET IIf(a, b, c) method evaluates both b and a regardless of the trueness of the first evaluation, but this seems to be the case in my standard construct, too:
If (example Is Nothing Or example.Item IsNot compare.Item) Then
'Proceed
End If
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I want to match a string embedded in double quotation marks. For ex.
He is "Best Friend" of my family. I am going to get
Best Friend Could you look at my pattern?
(?<q>["']).*?k<q> Right or not?
How can I get the variable My.Application.Info.Version.ToString to populate in the comments section?[code]..
View 2 RepliesI' ve got a thing that I'm wrking on, but it's one thing that isn't working.I have a backgroud (fire) and a man. But it doesn't become visible (the area outside the man). Is there any code so I can make a certain color invisible (not so you can see through the
View 39 Repliesdrawing 2D color coded graph in vb 2005
View 2 RepliesHow do I make it so that each item in a listbox can have a different font color? This is the only basic code i know that can change the font color of the listbox items. When I go to add a 2nd item and set the color, the first item in the listbox also changes to that color, I don't want that.
ListBox1.ForeColor = ColorDialog1.Color
Is it possible to store color values in a data table? Such that when these values are loaded into a datagrid, the datagrid will display the color.
View 2 RepliesI am opening an exe that launches in a hidden cmd window, and redirecting the text to a RichTextBox on a form. The problem is that the status messages in the cmd window are in color, but the redirected text in the RichTextBox has no color information and show as black on white. However, all the status messages in the cmd window have headers that could be parsed in some way so I can add color to them for my RichTextbox. For example, a message in the cmd window might read: [Warning] No settings file was found, using default values instead. This message is in Yellow in the cmd window.
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I got this Error. below is my code.
GenerateTheList is function.Need help
Private Sub buttGenerate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttGenerate.Click
Dim thread1 As New Thread(New ThreadStart(GenerateTheList))
thread1.Start()
End Sub
While looking in the dataset designer for a database table I am doing in visual basic 2008 I found a line for expressions under the property menu for a specific column. I need to know the code that I would put in this expression line so that this column adds up the numbers I input into three other columns and displays that number in the column. I need it to automatically calculate this for each row in the database table.
View 13 Replies