C# Development Notes: Safe Programming vs. Defensive Programming

#C# is a widely used object-oriented programming language, which is characterized by being easy to learn, strong typing, safe, reliable, efficient and highly efficient in development. However, C# programs may still be subject to malicious attacks or program errors caused by unintentional negligence. When writing C# programs, we should pay attention to the principles of safe programming and defensive programming to ensure the safety, reliability, and stability of the program.

1. Principles of secure programming

1. Do not trust user input
If there is insufficient verification in the C# program, malicious users can easily enter malicious data and attack the program. Developers should always be suspicious of and validate user input, and filter and limit potentially malicious input.

2. Prevent SQL injection attacks
SQL injection attacks are a common attack method. The attacker inserts malicious code into the SQL query statement in the application, thereby changing the original query statement logic. Parameterized queries and stored procedures should be used in C# applications to avoid SQL injection attacks.

3. Prevent cross-site scripting attacks
Cross-site scripting attacks (XSS) are also a common attack method. The attacker inserts malicious script code into the application page, causing the user's browser to Sensitive information such as cookies is obtained by attackers. Strict input filtering and secure HTML encoding should be used in C# applications to prevent XSS attacks.

4. Store passwords and sensitive information securely
Passwords and sensitive information should be stored using encryption and other security measures to avoid being stored in clear text in databases or files. Existing security mechanisms and trusted encryption algorithms should be used as much as possible.

5. Prohibit wrong debugging and development tools
In order to ensure security, C# applications should prohibit debugging symbols, disable debugger options, and avoid hot code replacement and other behaviors. Developers also need to take care to regularly check and update code dependencies to ensure program integrity and security.

2. Principles of Defensive Programming

1. Ensure the robustness of the code
When writing a C# program, possible exceptions should be taken into consideration to prevent the program from crashing or major events. mistake. Code robustness can be effectively improved by using exception handling mechanisms, code optimization, and using reusable code.

2. Avoid the consequences of hacker attacks or program vulnerabilities
When writing C# programs, you should try to avoid vulnerabilities that can be attacked. We can discover and fix these vulnerabilities by reviewing and testing the code, and use program namespaces, code comments, etc. to prevent the program from being illegally tampered with and changed.

3. Conduct code review
Code review is an effective defensive programming method. Through code review, loopholes and potential security issues in the program can be discovered, as well as the advantages and disadvantages of the code. This in turn improves the quality and security of your code.

Summary:

In C# program development, safe programming and defensive programming are very important. We must always remain vigilant and pay attention to safety and robustness. Only by following these principles can the stability and security of C# programs be ensured, thereby providing users with a better experience.

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