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Asked: 2026-05-11T00:54:09+00:00

var insInvoice = new NpgsqlCommand( @INSERT INTO invoice_detail( invoice_id, invoice_detail_id, product_id, qty, price, amount)

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var insInvoice = new NpgsqlCommand(     @'INSERT INTO invoice_detail(     invoice_id,     invoice_detail_id,     product_id,     qty,     price,     amount)     VALUES (     :_invoice_id,     :_invoice_detail_id,     :_product_id,     :_qty,     :_price,     :_qty * :_price)', c);   with(var p = insInvoice.Parameters) {     p.Add('_invoice_id', NpgsqlDbType.Uuid, 0, 'invoice_id');     p.Add('_invoice_detail_id', NpgsqlDbType.Uuid, 0, 'invoice_detail_id');     p.Add('_product_id', NpgsqlDbType.Uuid, 0, 'product_id');     p.Add('_qty', NpgsqlDbType.Integer, 0, 'qty');     p.Add('_price', NpgsqlDbType.Numeric, 0, 'price'); } 
kludge:  for(var p = insInvoice.Parameters; false;) {            p.Add('_invoice_id', NpgsqlDbType.Uuid, 0, 'invoice_id');     p.Add('_invoice_detail_id', NpgsqlDbType.Uuid, 0, 'invoice_detail_id');     p.Add('_product_id', NpgsqlDbType.Uuid, 0, 'product_id');     p.Add('_qty', NpgsqlDbType.Integer, 0, 'qty');     p.Add('_price', NpgsqlDbType.Numeric, 0, 'price');       }
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1 Answer

  1. As you’ve got an ‘Add’ method with the right form, you can use a collection initialiser for the parameters:

    var insInvoice = new NpgsqlCommand(sql) {     Parameters =      {         { '_invoice_id', NpgsqlDbType.Uuid, 0, 'invoice_id' },         { '_invoice_detail_id', NpgsqlDbType.Uuid, 0, 'invoice_detail_id' },         { '_qty', NpgsqlDbType.Integer, 0, 'qty' },         { '_price', NpgsqlDbType.Numeric, 0, 'price' }     } };

    For more on object and collection initializers, you can download chapter 8 of C# in Depth for free.

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