Warning: Qualifying Expression Will Not Be Evaluated.Picturebox.Image.Fromfile

Jan 8, 2011

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

[code]....

'Warning 1 Access of shared member, constant member, enum member or nested type through an instance; qualifying expression will not be evaluated.

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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

May 31, 2010

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

[code]....

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Access Of Shared Member ... Qualifying Expression May Not Be Evaluated

Jun 22, 2010

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)

[Code]....

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VS 2005 - Color - Formargb - Qualifying Expression Will Not Be Evaluated

Feb 14, 2010

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"))

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Access Of Shared Member, Constant Member, Enum Memberor Nested Type Through An Instance; Qualifying Expression Will Not Be Evaluated?

Jun 23, 2009

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

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Access Of Shared Member, Constant Member, Enum Member Or Nested Type Through An Instance; Qualifying Expression Will Not Be Evaluated

Jun 2, 2011

how do I overcome it? I have created a class and compiled into .dll This code

[Code]...

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Differences PictureBox.ImageLocation And Image.FromFile()

Jun 20, 2009

I am a little bit confused about PictureBox.ImageLocation and PictureBox.Image = Image.FromFile().

The problem: If I use PictureBox.Image = Image.FromFile() then I am not able to do something with the file unless I dispose the PictureBox (which I most likely don't want to do).

If I use PictureBox.ImageLocation instead, I get the same result but I am still able to delete / move / overwrite the picture file.

So, just to get confused entirely: What are the differences between PictureBox.ImageLocation and Image.FromFile? When should I use the first, when should I use the second?Listing SPEC's is not a review !!! :-)

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VS 2008 - Picturebox Image File Open Warning

Aug 31, 2011

am trying to replace a image in a picturebox with a new image. I am getting the warning that the file is open (locked). It works a few times and it bomb's out with the warning. How can i unlock the file? I am disposing the current image and setting it to Nothing. [Code]

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For Each Expression Evaluated More Than Once?

Nov 12, 2011

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?

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Change When An Expression In A Datacolumn Is Evaluated?

May 28, 2012

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.

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.net - C# - Code Contracts - Detected Expression Statement Evaluated For Potential Side-effect?

Jan 20, 2012

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)
{

[code]....

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.

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Display A Bitmap Image - Using Surfaceloader.Fromfile

Apr 8, 2009

I am trying to display a bitmap image and am having a bit of trouble. I am new to VB.net and its functions. Here is a few lines of code I am using REM load the bimap file

[Code]...

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Form Box Does Not Display New Background Picture Upon Image.FromFile ?

May 2, 2010

I've been trying to make an image viewer that keeps top most while I do other things (like typing, etc), so I don't have to hop windows, or sacrifice screen real estate.I made a main form, and a configuration form (opened by pressing o), with options to set the main form's opacity (working), the picture displayed (as the form's backgound picture, not working), and if the main form stays top most or not (working).

Instead, the form just keeps displaying the image I set in the IDE.I first used a picture box to display the picture, which did not work, and decided I didnt need to have a picture box if I set the picture as the form's background picture.I tried looking at what could be going wrong, but couldnt find out much more than the path is being delivered to the main form.I'm working on Vista Home Premium 32bit SP2, VS2003, and here's the code.PS The code links to a D:ath-fin.jpg that I used as the default background picture, and the code is for 2 seperate forms.

Public Class Form1 Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
Public Sub New()[code].....

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VS 2010 Image.fromfile Query - Set Images To A Text Box - Use A Full File Path?

May 17, 2011

I have been using the image.fromfile to set images to a text box but I always have to use a full file path. Like here;

[Code]...

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Out Of Memory Error: ' AnimatedImage = Image.FromFile - C:Documents And SettingsMain UserMy DocumentsVisual Studio

Jun 21, 2009

I'm trying to load a .ani file into a bitmap so it can be displayed on a control or on a form. The following code has been paired down from a short 'Download Sample' which I then edited to point to my .ani file. As indicated in the following code, I can load a .gif file, but I can't load a .ani file.

Here's my code:

Imports System

Imports System.Drawing

[CODE]...

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Use The ToString Method And A Counter To Concatenate A File Name Into A String Variable From The Image.FromFile Method?

Dec 18, 2010

I have nine pictures that I need to animate -I need to use the ToString method and a counter to concatenate a file name into a string variable from the Image.FromFile method. Once the counter reaches its maximum value, and the last picture is displayed, the counter should be reset to zero or one depending on how the first image file has been name. Also a static counter variable should be incremented in the time routine. what I have so far -- I know what I have to do; however, I just do not know how to code this properly.. Right now I have this going thru a button procedure but it needs to go through a timer.

[code]....

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Drew An Image In A Picturebox With The Image Height As Picturebox Height And Image Width As Picturebox Width

Aug 15, 2011

I drew an image in a picturebox with the image height as picturebox height and image width as picturebox width. The image is placed somewhere on the center of the picturebox. My intention is to scale the image to fit to the picturebox.

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Drag Image From Picturebox To A Dynamically Created Picturebox?

Sep 27, 2009

I have a program I'm working on that, for one of the features, allows the user to drag an image from a picturebox, into the main form space, anywhere they want. [code]...

When trying to drag the image from the CurrentTilePicBox, the very moment I move the mouse while dragging the cursor becomes a circle with a cross and won't drag and drop into the new picturebox.

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VS 2008 Add Picturebox During Runtime And Loading Image Into Picturebox?

Feb 8, 2010

i'm doing a simple form tat could add picturebox during runtime and i could add several picture into it.

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For Loop - PictureBox Is Type And Cannot Be Used As Expression

Mar 7, 2012

I have some problems with a for loop in visual basic.
Public Const numofblocks As Short = 88
Public Shared blocks(numofblocks) As PictureBox
For x = 1 To numofblocks
blocks((x)) = PictureBox(x)
Next
The error raised at the picturebox statement: PictureBox' is a type and cannot be used as an expression. The result of this for loop is that every picturebox in the designer form is named: blocks([number of picturebox]). I need this for some other for loops.

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Write A Fraction Expression On A Picturebox, ExpressionBox?

Oct 15, 2011

I'm trying to write a fraction expression on a picturebox, ExpressionBox, placed on the form at design time

Using gr As Graphics = Graphics.FromImage(ExpressionBox.Image)
gr.Clear(Color.BlanchedAlmond)
gr.DrawString(Expr(0), NormalFont, Brushes.Black, 40, 0) ' numerator
gr.DrawString("Kapp=", NormalFont, Brushes.Black, 8, 13)
gr.DrawString(Expr(1), NormalFont, Brushes.Black, 40, 24) ' denominator
gr.DrawLine(Pens.Black, 0, 20, 300, 20)
End Using

The exception occurs when the code is entered. I've used similar code elewhere in the program without problems, so why is this exception occurring here?

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PictureBox - Image: Select The Path To A Local Folder That Is Within The Application And Get An Image From It?

Sep 15, 2010

I have a Picturebox and a two Buttons on my Form. On click of one of the buttons I want to change the image in the picture box at runtime.

This works fine when I give the location of the image (the full path ) on my computer - but then of course it will not work if I use the solution on a different computer .

So I have made a folder named "Pics" inside my application and added two images into it.

How do I get to this local folder in the following code?

Picturebox1.image = system.drawing.image.fromfile (??? )
instead of the usual,
Picturebox1.image = system.drawing.image.fromfile ("C:UsersMyName My PicturesMyPicture.jpg" )

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Runtime Picturebox.image Update From A Control Owned Imagelist.image

Feb 1, 2012

I'm trying to update pictures boxes with images of controls stored in an imagelist owned by a control. The images stored in the control.imagelist do not showup in the picturebox. I'm working on simplifying the code to post, but for now could use help.If I store the image in a member variable owned bythe control it woks fine.Something to do with persistance of images in control owned imagelist? [code]

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Add Picture Box Image Name To Textbox - Depending On Image Displayed In Picturebox

May 20, 2009

i'm lost on this code.. i have a picturebox that swaps 2 images, depending on the action, file_red and file_green.. what i'm trying to to is, if a picturebox switches a image or not, to be able to detect that and have textbox8 add a line with the detection.

[Code]...

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FAQ: Draw An Image Respectively On The PictureBox Control And Image Object?

Apr 10, 2009

How do I draw an image respectively on the PictureBox control and Image object? Welcome to the All-In-One Code Framework! If you have any feedback,

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Make A Picturebox Image Equal A Certain Part Of The Image

May 23, 2010

i have a image with four squares evenly spaced out. I want a picturebox's image to be one of the squares at a time so it's like a animation except it's only one image.

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Comparing PictureBox.Image With Resource Image?

Dec 30, 2010

I have a PictureBox which I would like to check if it's the same as one already imported to resources . If it's the same it'd do a condition otherwise it's do something else .

If I try

If PictureBox1.Image = Jogos_Matem�ticos.My.Resources.Resources.Cross Then
'code here
Else

[Code]....

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Crop Original Image But Not Image In Picturebox?

Feb 8, 2011

I have an application which first load an 1200*800 image into an 600*400 picturebox. When i crop the whole image in picturebox and save it, the size will be 600*400. How can i make it save in 1200*800?

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'FromFile' Is Not A Member Of 'String'

Aug 29, 2009

I cant get my program to open a Text file[code]...

Also, how would I save a text file that was written in the program?

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C# - Could .NET Be Parsed And Evaluated At Runtime

Nov 30, 2011

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))

[Code].....

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?

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