Npgsql is the open source .NET data provider for PostgreSQL. It allows you to connect and interact with PostgreSQL server using .NET.

Here's a basic code snippet to get you started:

var connString = "Host=myserver;Username=mylogin;Password=mypass;Database=mydatabase";

await using var conn = new NpgsqlConnection(connString);
await conn.OpenAsync();

// Insert some data
await using (var cmd = new NpgsqlCommand("INSERT INTO data (some_field) VALUES (@p)", conn))
{
    cmd.Parameters.AddWithValue("p", "Hello world");
    await cmd.ExecuteNonQueryAsync();
}

// Retrieve all rows
await using (var cmd = new NpgsqlCommand("SELECT some_field FROM data", conn))
await using (var reader = await cmd.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
    Console.WriteLine(reader.GetString(0));
}

• High-performance PostgreSQL driver. Regularly figures in the top contenders on the TechEmpower Web Framework Benchmarks.
• Full support of most PostgreSQL types, including advanced ones such as arrays, enums, ranges, multiranges, composites, JSON, PostGIS and others.
• Highly-efficient bulk import/export API.
• Failover, load balancing and general multi-host support.
• Great integration with Entity Framework Core via Npgsql.EntityFrameworkCore.PostgreSQL.

For the full documentation, please visit the Npgsql website.

• The Entity Framework Core provider that works with this provider is Npgsql.EntityFrameworkCore.PostgreSQL.
• Spatial plugin to work with PostgreSQL PostGIS: Npgsql.NetTopologySuite
• NodaTime plugin to use better date/time types with PostgreSQL: Npgsql.NodaTime
• OpenTelemetry support can be set up with Npgsql.OpenTelemetry