.Net Core how to implement SQLAdapter ./ DataTable function

Question

I have a simple .Net Framework routine which runs a query and returns a DataTable object. I need to port this to .Net Core, however I infer that SQLAdapter and DataTable ar

Answer 1

UPDATE: This answer corresponds to .NET Core 1.x (which was the latest at the time I wrote this). If you are using .NET Core 2.x (in beta as of July/2017), check Joe's answer.

Original answer:

Recommended read: Porting to .NET Core

I quote:

• System.Data. While the base layer is already part of .NET Core, i.e. the provider model and SQL client, some features are currently not available, such as schema support and DataTable/DataSet.

You can use SqlDataReader but not SqlAdapter or DataTable.

Start by adding System.Data.SqlClient NuGet Package.

Then you can...

var con = new SqlConnection("...");
var cmd = con.CreateCommand();
cmd.CommandText = "...";
var reader = cmd.ExecuteReader();
// populate your custom data structure

Does IList> works for you?

var results = new List>();

while (reader.Read())
{
    results.Add(Enumerable.Range(0, reader.FieldCount).ToDictionary(reader.GetName, reader.GetValue));
}
return results;

So now you can read using results[0]["FirstName"].ToString()

Unless you want to switch to Entity Framework Core, in that case this tutorial is handy.