How Should I Properly Close Connections When Using Dapper?

How to Close a Connection When Using Dapper

Dapper offers two ways of handling connections:

1. Self-Management

With this approach, you take full responsibility for opening and closing the connection, similar to working with ADO.NET directly.

2. Dapper Management

Dapper can automatically handle opening and closing connections. This is comparable to DataAdapter.Fill(), but may not be suitable for all scenarios.

It's generally recommended to manage connections yourself if you're closing connections at a wider granularity (e.g., per request) because it improves code control.

Regardless of the connection management approach, remember to close the connection to avoid resource leaks and improve performance by returning it to the connection pool.

Using UnitOfWork and Repositories

To better manage transactions, consider implementing a UnitOfWork pattern, as shown below:

public sealed class UnitOfWork : IUnitOfWork
{
    // Connection and transaction management logic here
}

Your repositories can then accept the UnitOfWork:

public sealed class MyRepository
{
    public MyRepository(IUnitOfWork unitOfWork) { /* Implementation */ }
    
    public MyPoco Get() { /* Implementation using unitOfWork */ }
    
    public void Insert(MyPoco poco) { /* Implementation using unitOfWork */ }
}

By using a UnitOfWork, you centralize the control of connection management and transactions, improving code organization and maintainability.

For more details on UnitOfWork, refer to the provided source code and external resources.

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