Скачать или смотреть How to Access a private Class Variable from Another private Class in C#

Learn how to access and utilize `private` class variables efficiently in C# with clear explanations and practical examples.
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This video is based on the question https://stackoverflow.com/q/62528118/ asked by the user 'Marynathan Judson' ( https://stackoverflow.com/u/12419211/ ) and on the answer https://stackoverflow.com/a/62528233/ provided by the user 'nanu_nana' ( https://stackoverflow.com/u/13687491/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the Dilemma: Accessing a private Class Variable from Another private Class in C#

As a beginner in C# , you may encounter challenges when working with class members, especially when it comes to scope and accessibility. One common question that arises is how to access a private class variable from another private class, particularly when it involves methods triggered by events such as mouse clicks. In this guide, we will explore a simple solution to this issue.

Understanding the Problem

In C# , private variables are accessible only within the class where they are defined. This encapsulation is useful for protecting class data but can make it tricky to use variables across different methods within the same class.

For example, if you have a variable named startX defined inside the panel1_MouseDown method, you cannot directly access it in the panel1_MouseUp method because startX is constrained to the local scope of panel1_MouseDown.

Sample Code Analysis

You provided the following C# code snippet:

[[See Video to Reveal this Text or Code Snippet]]

Providing a Solution: Use a Global Variable

To resolve the dilemma of accessing startX in panel1_MouseUp, we can introduce a global variable that is accessible throughout the class. This global variable will store the value of startX and can be modified within the panel1_MouseDown method.

Step-by-Step Implementation

Declare a Global Variable

First, you need to declare startX as a class member variable outside of your methods:

[[See Video to Reveal this Text or Code Snippet]]

Modify the Mouse Down Event

Next, update the panel1_MouseDown method to assign the value of e.X to the global variable lastStartX:

[[See Video to Reveal this Text or Code Snippet]]

Access the Global Variable in the Mouse Up Event

Now you can easily access lastStartX in the panel1_MouseUp method:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

With this approach, you can seamlessly share values between your methods while maintaining proper encapsulation through a class variable. Creating a global variable is a straightforward and effective solution for beginners looking to share data across methods within a class in C# .

As you continue your programming journey, remember that understanding scope and accessibility will empower you to write more efficient and maintainable code. Happy coding!