Question

Is there a pure .net way to do this reliably? The solutions I keep finding either require guessing or they have a solution that is specific to a database provider. Usually querying some internal system table to get this information.

Answer 1

Each DataTable object has a PrimaryKey property wich is an array of DataColumns that represent the table’s primary key.

For example:

string[] GetPrimaryKeys(SqlConnection connection, string tableName) {     using(SqlDataAdapter adapter = new SqlDataAdapter('select * from ' + tableName, connection))     using(DataTable table = new DataTable(tableName))     {         return adapter             .FillSchema(table, SchemaType.Mapped)             .PrimayKey             .Select(c => c.ColumnName)             .ToArray();     } }