Very Simple Definition of Initializecomponent(); Method

Very Simple definition of InitializeComponent(); Method

InitializeComponent is a method automatically written for you by the Form Designer when you create/change your forms.

Every Forms file (e.g. Form1.cs) has a designer file (e.g. Form1.designer.cs) that contains the InitializeComponent method, the override of the generic Form.Dispose, and the declaration of all of your User Interface objects like buttons, textboxes, labels and the Form itself.

The InitializeComponent method contains the code that creates and initializes the user interface objects dragged on the form surface with the values provided by you (the programmer) using the Property Grid of the Form Designer. Due to this fact do not ever try to interact with the form or the controls before the call to InitializeComponent.

Also, you will find here, the plumbing required to link the controls and form events to the specific event handlers you have written to respond to the user actions.

The code contained in Form1.cs and the Form1.Designer.cs files is part of the same class thanks to the concept of partial classes that could keep two or more files of your code together like a single block of code.

Of course, due to the high numbers of changes executed by the Form Designer, it is a really good advice to not try to modify manually this method, while, sometime, I find useful to add code to the Dispose method with the purpose to destroy some unmanaged objects created in the form lifetime.

What does InitializeComponent() do, and how does it work in WPF?

The call to InitializeComponent() (which is usually called in the default constructor of at least Window and UserControl) is actually a method call to the partial class of the control (rather than a call up the object hierarchy as I first expected).

This method locates a URI to the XAML for the Window/UserControl that is loading, and passes it to the System.Windows.Application.LoadComponent() static method. LoadComponent() loads the XAML file that is located at the passed in URI, and converts it to an instance of the object that is specified by the root element of the XAML file.

In more detail, LoadComponent creates an instance of the XamlParser, and builds a tree of the XAML. Each node is parsed by the XamlParser.ProcessXamlNode(). This gets passed to the BamlRecordWriter class. Some time after this I get a bit lost in how the BAML is converted to objects, but this may be enough to help you on the path to enlightenment.

Note: Interestingly, the InitializeComponent is a method on the System.Windows.Markup.IComponentConnector interface, of which Window/UserControl implement in the partial generated class.

The code within the method 'InitializeComponent' is generated by the designer

The code within the method 'InitializeComponent' is generated by the
designer and should not be manually modified. Please remove any
changes and try opening the designer again.

Generated code shouldn't be modified, because manual changes will be discarded. This should really be a warning, but it does highlight the issue before you get too deep.

There are a few solutions:

• Delete the modified designer files(*.g.cs) and rebuild. This should cause VS to regenerate them. This usually works, but does fail from time to time. Designer files won't be visible from the solution explorer unless manually added, you'll have to delete them from the file browser. By default they're in the obj folder of the project.
• If you haven't saved, closed, and re-opened the solution, you should be able to undo all changes made to the designer file.
• Copy all but the designer code to a scratchpad, delete the form, recreate it, and inject the copied code where appropriate.

I'm getting errors here too. It's red underlining bool and
components.Dispose

This suggests Dispose isn't a method of whatever class components is. Until you post its type we can't be of much help with this.

Also I'm getting many errors regarding the FormA. (It's not called
that, I'm just using it for clarity.) Ambiguity between FormA.textA
and FormA.textA (Yes it's the same, but it compiles just fine with the
original version.)

This is most likely related to the designer file issue. Try the solutions at the beginning of this answer. If that doesn't fix it, the form code(i.e. FormA.cs) must have duplicate fields. Ensure that the designer file hasn't been modified and no duplicate field names exist in the form code.

What does this code means?

InitializeComponents(); is a function for initializing the values of the form. Please right click on it and click on Showdefinition to see its contents. It is used to assign values to labels, textbox, Buttons etc in your form.

public partial class Form1 : Form
By using partial it is possible to write the definition of same class in two different source file in the same namespace.It will be treated as same during compilation.You can find a class with same name Form1 in your project which is created automatically.

Form1 is the name of the Form and : is used to inherit the properties of base class . Here Form represents System.Windows.Forms.Form. We are inheriting to access the properties and methods of base class.

Editing the InitializeComponent() method C#

There are only a few reasons why one might need to edit InitializeComponent, such as:

1. To correct bugs introduced by a bad toolbox item designer.
2. To remove all traces of a control that cannot be deleted from the VS designer. (This has to be done carefully.)
3. To make quick "designer friendly" tweaks: changing a property value, adding a property setting, or removing a property setting. When adding a setting, I make sure it looks just like the designer-generated code.

After editing InitializeComponent, I always save & switch back to Designer mode to make sure I didn't break anything.

Any manual initialization code should be added outside InitializeComponent, e.g. OnLoaded() in a WinForms form or user control. As for fixing existing forms, it may be simple or nearly impossible depending on how complicated the form is, especially if controls have been added manually and required initialization methods (such as SuspendLayout, BeginInit) aren't being called.

dispose() and initializeComponent() method in C# make problems

The forms designer employs partial classes - the InitializeComponent method is defined there. If you want to create your form in code yourself, don't use the designer but create a normal class and derive from Form yourself.

Dispose seems to be defined as well and isn't overrideable, so you don't need your method anyway.

Why can't Visual Studio find my WPF InitializeComponent method?

Looks like this was a kink in Visual Studio 2008.

If I create a new file (i.e. Title2), copy/paste the code and XAML, then change all 'Title' to 'Title2', everything works fine again.

BlankPage constructor cannot initialize components

If your Main class's namespace is different than .xaml file's x:Class attribute, you will get this error. For instance;

Your MainPage.xaml.cs;

    namespace UWPControls
    {
        /// <summary>
        /// An empty page that can be used on its own or navigated to within a Frame.
        /// </summary>
        public sealed partial class MainPage : Page
        {
            public MainPage()
            {
                this.InitializeComponent();
            }
        }
    }

Your MainPage.xaml;

<Page
    x:Class="UWPControls_Different.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:UWPHelloWorld"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
</page>

You're going to see the error until changing x:class to the;

x:Class="UWPControls.MainPage"

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