Скачать или смотреть How to Fix StreamReader Displaying Only the Last Item in Your C# Program

Discover why your C# application's `StreamReader` is only displaying the last student's test results and how to solve it, ensuring all data is processed correctly.
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This video is based on the question https://stackoverflow.com/q/66716390/ asked by the user 'Autumn Jamail' ( https://stackoverflow.com/u/15436167/ ) and on the answer https://stackoverflow.com/a/66716543/ provided by the user 'Daniel Bistuer' ( https://stackoverflow.com/u/12227025/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Fix StreamReader Displaying Only the Last Item in Your C# Program

If you are working on a C# application that utilizes StreamReader to process student names and their corresponding test scores from .txt files, you might encounter an issue where only the last set of data is displayed. In this guide, we will explore why this happens and guide you through a solution step-by-step.

The Problem

Understanding the Core Issue
The issue arises when your program reads multiple lines from the text file but only displays the details of the last student after processing all the lines. You have a method called getData() that reads all of the student information, but you're inadvertently overwriting variable values during each iteration of your loop, leading to only the final student's data being stored.

Here’s a breakdown of what should happen:

The program reads a student's name.

It then reads three test scores.

Finally, it calculates the average and assigns a letter grade.

However, due to the way the program is structured, it ends up only retaining details for the last student processed.

The Solution

1. Collect Data in a List

To avoid overwriting the values for each student, you need to store the results in a collection such as a list. This way, every time you read a student's data, you can save it without losing the previous entries.

Modify the getdata() Method
You can modify the getdata() method to store each student's data in a list. Here’s how you can implement this change:

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

2. Modify the calculatedata() and displaydata() Methods

Now that you have a list of students, you need to adjust the methods responsible for calculating averages and displaying data to handle each student in your list.

Update your calculatedata() Method:

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

And your displaydata() Method:

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

3. Resetting the List

You might also want to clear the list of students whenever the process is restarted. This can be done in your resetitems() method:

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

Conclusion

By modifying your program as described, you can ensure that all student data is processed and displayed correctly, rather than just the last entry. This enhancement will improve the functionality of your C# application and provide users with comprehensive results.

Now, each time you select a file and process the data, all student information, including averages and letter grades, will be displayed, enhancing the user experience significantly.

Implementing these changes should help you resolve the issue with StreamReader and improve your understanding of data handling in C# . Happy coding!