We Keep Coding

Child Form cannot find text file

I have created a boolean algebraic simplifier. It simplifies expressions and I am content with it. However, I am trying to add a feature that allows users to check if two expressions are equivalent. For this I have created a new form that allows the user to input two expression by clicking buttons. To do this, I thought it best to simplify both expressions and then compare the two for equivalency. As I have got lots of subroutines and code that works for simplification in another form, I thought making the form a child form of the form with the code in would allow me to call the subroutines instead of copying them onto the form. I have made these protected in the parent form. I have inherited like so:
public partial class Expression_Equivalency_Form : Expression_Simplifier
However, when I click onto the form designer, this error appears and I cannot view the graphical interface of the form:
"Could not find file File Path"
The file is in the debug folder which is within the bin folder within the folder containing the program and is recongised in the parent class. The file is read from and appeneded by the parent form without issue. I have tried to research this but have been unable to find a solution. Does anyone know one?
I have read to the file and appended to it. I have also used the following code to remove any blank lines from my text file:
File.WriteAllLines("PreviousExpressionInputs.txt",
File.ReadAllLines("PreviousExpressionInputs.txt").Where(l => !string.IsNullOrWhiteSpace(l)));
Code that writes to the file:
using (BinaryWriter Writer = new BinaryWriter(File.Open("PreviousExpressionInputs.txt",
FileMode.Append)))
{
Writer.Write(expressionandanswertowritetotextfile);
}
Code that reads from the file:
foreach (string line in File.ReadLines("PreviousExpressionInputs.txt"))
{
try
{
LinesInFile.Add(line);
}
catch (Exception)
{
}
}

Consider following facts:
When you open a form in design mode, the constructor of its base class will run.
When you look for a relative file name, the path will be resolved relative to the current working directory of the application.
When the form is in design mode, the current application is Visual Studio and its working directory is where the devenv.exe is located.
It describes why you cannot find your text files. Because you have some code in the constructor of your base form(or fir example load event handler of the base form) which looks for the file and since the filename is relative, its looking for the file in the Visual Studio working directory and could not find file.
How to prevent the problem? Check DesignMode property to prevent running the code:
public partial class MyBaseForm : Form
{
public MyBaseForm()
{
InitializeComponent();
}
private void MyBaseForm_Load(object sender, EventArgs e)
{
MessageBox.Show("This will show both in run-time and design time.");
if (!DesignMode)
MessageBox.Show("This will show just in run-time");
}
}
Create the derived form and open it in designer to see what happens:
public partial class Form1 : MyBaseForm
{
public Form1()
{
InitializeComponent();
}
}
To learn more about how designer works take a look at this post.

uwp inheriting from base page giving compile errors

I am trying to inherit from a base page instead of Normal Page control of XAML but Visual Studio is giving me compile time errors that OnNavigatedTo method not found to be overridden.
I am doing this because I have multiple pages with a lot of similar code and I want to write that code just once, so I want to write that code in parent class and then inherit all pages from that parent class, I followed guidelines as stated on multiple resources on internet and below is my code.
Parent Class:
public class VideoParentPage : Page
{
}
Child Class (AllVideoPage.xaml.cs):
public sealed partial class AllVideosPage : VideoParentPage
{
public AllVideosPage() : base()
{
InitializeComponent();
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
SetBanner();
}
}
XAML in file AllVideosPage.xaml:
<local:VideoParentPage
xmlns:local="using:Fluent_Video_Player.Views.Shared"
...some unrelated XAML code...
</local:VideoParentPage>
Note: I have used all necessary using statement in C# classes.

You should try cleaning the solution Build > Clean Solution, closing VS, removing the remaining bin and obj folders and then compiling the app again.

Why can't I use a Partial Class in a VSTO Ribbon?

I'm trying to break up a very big VSTO IRibbonExtensibility class into multiple smaller classes to make things more manageable.
I tried creating a partial class with all my Visibility callbacks in it.
The code compiles fine but doesn't work in MS Word.
Error: The call to GetCustomUI() for RibbonID 'Microsoft.Word.Document' failed.
Any idea why this isn't working??
[ComVisible(true)]
public partial class Ribbon : O.IRibbonExtensibility
{
..
}
public partial class Ribbon
{
..
}

Sorry, my bad..
I had moved the Ribbon.xml file into a new folder and that caused the issue

Losing UserControl when editing winForm VS2012

I have a Form called EmployeeForm inside this form i'm including some UserControl and when I edit EmployeeForm every UserControl inside the form are lost.
This picture show a diff between TFS(left) and Local(right) file, after modifying the name of a combobox
Example of this.ucEmployeeKeyOne :
public partial class Employee_EmployeeKeyOneRelationUC
: Employee_EmployeeKeyOneRelation_GenericUC
{ [other Code Here] }
public class Employee_EmployeeKeyOneRelation_GenericUC
: RelationUC<MyObject>
{ }
and the definition of RelationUC :
public partial class RelationUC<T>
: DataUserControlBase
{ [other Code Here] }
public partial class DataUserControlBase
: UserControlBase
{ [other Code Here] }
public partial class UserControlBase
: System.Windows.Forms.UserControl, MyInterfaceHere
{ [other Code Here] }
All UserControl i'm losing are inherited from RelationUC<T>. Does the generic type of RelationUC may cause the problem?

For the Vs designer to load the controls, the control should be able to initialize including all public properties and you must have a empty constructor. If you don't have an empty constructor or have properties that are returning from the inherited nullable class, it is most likely the the designer will crash.
To Debug this,
1) open you project in VS but do not open the file that contains the controls yet;
2) open another VS and attach the process of VS that your project is opened;
3) set the break on exceptions (short cut 'CTRL + D, CTRL +E' ) to all (once you become familiar with what exception the designer is throwing, you can set that exception only.);
4) Go to the VS with you project and open the file that contain your user control. when the exception is thrown, the second VS will catch it and tell you exactly why and where.

Partial Class Declaration Error in MonoTouch Hello World tutorial

I'm trying out the Hello World tutorial in the MonoTouch Trial version and I have put in all the code and attempted a build.
In the designer.cs file, the line
partial void actBtn (MonoTouch.Foundation.NSObject sender)
gives an error of
A partial method 'HelloWorld_iPhone.HelloWorld_iPhoneViewController.actBtn (MonoTouch.Foundation.NSObject sender)' implementation is missing a partial method declaration.
What did I miss?
I should add that this line was inserted automatically by MonoTouch - I only wrote the single line of method code which follows.

I have never tried monotouch but one think ticks here ->
Looking at the code in question, can we have a partial method in c# and monotouch??
I have used partial class but we cannot declare a partial method.
partial cannot be used as a access modified for methods.

The way the tutorial reads, it implies that you put the code in the Designer.cs file. That's wrong. The code they are showing you actually goes in the Controller.cs file.
Here's what you add to the Controller.cs file:
partial void actnButtonClick (MonoTouch.Foundation.NSObject sender)
{
this.lblOutput.Text = "Action button " + ((UIButton)sender).CurrentTitle + " clicked.";
}

I could achieve it by putting the statement in the file controller.cs.
In my example this way:
partial void action1 (MonoTouch.Foundation.NSObject sender);
and in my designer.css:
[Action ("action1:")]
partial void action1 (MonoTouch.Foundation.NSObject sender){
this.lblOutput.Text=" Action 1 activated";
}
which means that the statement is in a separate class, and implementation in the designer.