Demo/pr review demo #6
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…e code quality issues including naming conventions, field usage, async handling, and SQL injection vulnerabilities.
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| // No #region blocks for organization | ||
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| public string connectionString = "Server=localhost;Database=demo;User=sa;Password=admin123"; |
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Bug: Credentials Hardcoded in Source Code
The database connection string, including sensitive credentials, is hardcoded directly in userService.cs. This exposes confidential information and creates a security vulnerability.
| var password = "admin123"; | ||
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| // Not using async properly | ||
| var users = GetAllUsers().Result; |
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Bug: SQL Injection & Async Blocking
The GetData method is vulnerable to SQL injection due to direct user input concatenation in the query. It also blocks an async operation by using .Result, which can cause deadlocks and negates the benefits of async programming.
| // Not disposing resources | ||
| var connection = new System.Data.SqlClient.SqlConnection(connectionString); | ||
| connection.Open(); | ||
| // Never closed or disposed |
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Bug: Unhandled Exceptions and Resource Leaks
The GetData method has two issues: it calls users.First() without checking if the collection is empty, which can cause an InvalidOperationException. Additionally, a SqlConnection is opened but not disposed, leading to a resource leak and potential connection pool exhaustion.
| // N+1 query pattern example | ||
| public void LoadUserOrders() | ||
| { | ||
| var users = GetAllUsers().Result; |
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Bug: Synchronous Await Causes Deadlocks
Calling .Result on an async method synchronously blocks the calling thread. This can lead to deadlocks, especially in UI or ASP.NET synchronization contexts.
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