Зміст курсу

C# Beyond Basics

1. Additional Structures & File Handling

What are Lists?Practicing List Declaration List Methods What are Dictionaries?Practicing Dictionaries Reading Files using StreamReader Reading Files using File Methods Writing Files Error Handling Practicing Error Handling

2. Structs & Enumerators

What are Structs?Defining & Using a Structure Practicing Structs Structs with Other Data Structures Struct Methods Correctly Accessing Fields in Struct Methods Practicing Methods Struct Constructors Practicing Constructors Enumerators Practicing Enumerator

3. Introduction to Object-Oriented Programming (OOP)

What is Object-Oriented Programming?Defining Classes Practice: Creating Classes Class Objects Class Objects vs Struct Objects Practice: Objects Class Methods Practice: Methods Class Constructors Practice: Constructors

4. OOP Essentials

Derived Classes Derived Classes Practice Common Access Modifiers Access Modifiers Practice The `static` Keyword Practicing `static` Keyword Method Overloading Method Overloading Practice

5. OOP Principles

What are the Principles of OOP?Inheritance Practicing Inheritance Polymorphism Practicing Polymorphism Encapsulation Encapsulation Practice Abstraction Abstraction Practice What's Next?

C# Beyond Basics

Writing Files

For writing text in a file we create a StreamWriter object with the path of the file, similar to how we create a StreamReader object.

The platform currently doesn't support file writing so this can be practiced on a compiler on your PC.

The StreamWriter object offers a WriteLine method which can write text into a file. We will now try to write something to the text.txt file.

index.cs

The above code will overwrite the previous content of the text.txt file and replace it with:

If the targeted file does not exist, it will create a new file with the specified name and add text to it so this approach can also be used for creating new files. However if the required folders in the path do not exist then it will give a runtime error causing the program to crash.

StreamWriter has a second parameter called "append" which takes in a boolean value and is set to false by default. If we set the append parameter to true then the code will not overwrite the older text rather it would append the new text to the end of the file.

For-example, consider the file text.txt has the following text in it:

text.txt

We will use the following code to add a new line to it:

index.cs

The file will look like this after running the code:

text.txt

1. What is the correct way of creating a StreamWriter object for appending text into a file?

2. What method is used to write a line to a text file using the StreamWriter class?

3. Which method is used for closing a file after use?

What is the correct way of creating a StreamWriter object for appending text into a file?

Виберіть правильну відповідь

new StreamWriter(filePath);

new StreamWriter(filePath, false);

new StreamWriter(filePath, true);

What method is used to write a line to a text file using the StreamWriter class?

Виберіть правильну відповідь

Write()

Append()

WriteLine()

AddLine()

Which method is used for closing a file after use?

Виберіть правильну відповідь

file.Dispose()

file.Close()

file.End()

None

Все було зрозуміло?

Секція 1. Розділ 8

Зміст курсу

C# Beyond Basics

1. Additional Structures & File Handling

2. Structs & Enumerators

3. Introduction to Object-Oriented Programming (OOP)

4. OOP Essentials

Derived Classes Derived Classes Practice Common Access Modifiers Access Modifiers Practice The `static` Keyword Practicing `static` Keyword Method Overloading Method Overloading Practice

5. OOP Principles

What are the Principles of OOP?Inheritance Practicing Inheritance Polymorphism Practicing Polymorphism Encapsulation Encapsulation Practice Abstraction Abstraction Practice What's Next?

C# Beyond Basics

Writing Files

For writing text in a file we create a StreamWriter object with the path of the file, similar to how we create a StreamReader object.

The platform currently doesn't support file writing so this can be practiced on a compiler on your PC.

The StreamWriter object offers a WriteLine method which can write text into a file. We will now try to write something to the text.txt file.

index.cs

The above code will overwrite the previous content of the text.txt file and replace it with:

For-example, consider the file text.txt has the following text in it:

text.txt

We will use the following code to add a new line to it:

index.cs

The file will look like this after running the code:

text.txt

1. What is the correct way of creating a StreamWriter object for appending text into a file?

2. What method is used to write a line to a text file using the StreamWriter class?

3. Which method is used for closing a file after use?

What is the correct way of creating a StreamWriter object for appending text into a file?

Виберіть правильну відповідь

new StreamWriter(filePath);

new StreamWriter(filePath, false);

new StreamWriter(filePath, true);

What method is used to write a line to a text file using the StreamWriter class?

Виберіть правильну відповідь

Write()

Append()

WriteLine()

AddLine()

Which method is used for closing a file after use?

Виберіть правильну відповідь

file.Dispose()

file.Close()

file.End()

None

Все було зрозуміло?

Секція 1. Розділ 8