Introduction to .NET with C#

Kursinnehåll

Introduction to .NET with C#

Introduction to .NET with C#

1. Introduction

What is the .NET Platform exactly?Creating a Console Application Taking input from the User Task - Building a Simple Calculator Dealing with Exceptions caused by User Input Task - Improving the Calculator Reading Files Writing Files Task - File Based Calculator

2. Asynchronous Programming and Introduction to Web Services

What is Asynchronous Programming?Implementing an Asynchronous Method Task - Asynchronously Reading Files Introduction to APIs Making a GET Request Task - Using an API Handling Exceptions caused by HTTP Request Task - Exception Handling for API Response

3. Introduction to Databases with .NET

What is a Database?Structure of a Relational Database Setting Up A MySQL Server Connecting to the MySQL Server Task - Writing Connection Strings Executing Commands Task - Executing MySQL Commands MySqlCommand Methods Task - Connecting to a MySQL Database and Executing Commands

4. CRUD Operations with MySQL

Introduction to CRUD Operations Installing & Using MySQL Workbench CREATE - Part I Task - Using CREATE CREATE - Part II Task - Using INSERT Read Task - Using SELECT Update Task - Using UPDATE Delete - Part I Delete - Part II Task - Using DELETE

5. Optimizing Database Operations

Stored Procedures Task - Executing Stored Procedures DataReader vs DataSet DataAdapter & DataSet Task - Reading Tables using MySqlDataAdapter What's Next?

Dealing with Exceptions caused by User Input

Recap:

try-catch blocks can be used for avoiding program crashes in case of invalid inputs;
The code that parses user input can be enclosed into a try block, and an error message can be displayed to the user via the catch block in case the parsing fails;
We can enclose the try-catch block into an infinite while loop, which breaks after the user input is successfully parsed and stored. This way, we can make sure that instead of crashing, the program prompts the user for input until the user gives the correct input.

1. In a try-catch structure, where should the code that might throw an exception be placed?

2. What will happen if the user enters "abc" when prompted?

In a try-catch structure, where should the code that might throw an exception be placed?

Select the correct answer

In the catch block

In the finally block

In the try block

Outside the try-catch structure

What will happen if the user enters "abc" when prompted?

Select the correct answer

The program will display "Result: abc"

The program will catch an exception and display "Invalid input. Please enter a valid number."

The program will terminate

The program will display "Invalid input. Please enter a valid number."

Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 1. Kapitel 5

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Kursinnehåll

Introduction to .NET with C#

Introduction to .NET with C#

1. Introduction

What is the .NET Platform exactly?Creating a Console Application Taking input from the User Task - Building a Simple Calculator Dealing with Exceptions caused by User Input Task - Improving the Calculator Reading Files Writing Files Task - File Based Calculator

2. Asynchronous Programming and Introduction to Web Services

What is Asynchronous Programming?Implementing an Asynchronous Method Task - Asynchronously Reading Files Introduction to APIs Making a GET Request Task - Using an API Handling Exceptions caused by HTTP Request Task - Exception Handling for API Response

3. Introduction to Databases with .NET

What is a Database?Structure of a Relational Database Setting Up A MySQL Server Connecting to the MySQL Server Task - Writing Connection Strings Executing Commands Task - Executing MySQL Commands MySqlCommand Methods Task - Connecting to a MySQL Database and Executing Commands

4. CRUD Operations with MySQL

Introduction to CRUD Operations Installing & Using MySQL Workbench CREATE - Part I Task - Using CREATE CREATE - Part II Task - Using INSERT Read Task - Using SELECT Update Task - Using UPDATE Delete - Part I Delete - Part II Task - Using DELETE

5. Optimizing Database Operations

Stored Procedures Task - Executing Stored Procedures DataReader vs DataSet DataAdapter & DataSet Task - Reading Tables using MySqlDataAdapter What's Next?

Dealing with Exceptions caused by User Input

Recap:

try-catch blocks can be used for avoiding program crashes in case of invalid inputs;
The code that parses user input can be enclosed into a try block, and an error message can be displayed to the user via the catch block in case the parsing fails;
We can enclose the try-catch block into an infinite while loop, which breaks after the user input is successfully parsed and stored. This way, we can make sure that instead of crashing, the program prompts the user for input until the user gives the correct input.

1. In a try-catch structure, where should the code that might throw an exception be placed?

2. What will happen if the user enters "abc" when prompted?

In a try-catch structure, where should the code that might throw an exception be placed?

Select the correct answer

In the catch block

In the finally block

In the try block

Outside the try-catch structure

What will happen if the user enters "abc" when prompted?

Select the correct answer

The program will display "Result: abc"

The program will catch an exception and display "Invalid input. Please enter a valid number."

The program will terminate

The program will display "Invalid input. Please enter a valid number."

Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 1. Kapitel 5

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