我的C＃代码出了什么问题？

Question

There is something wrong with my code here:

byte[] bits = Convert.ToByte(ds.Tables[0].Rows[0].Item[0]);

There's an error saying that:

System.Data.DataRow does not contain a definition for 'Item'and no extension method 'Item' accepting a first arguement of type 'System.Data.DataRow could be found.

Where did I go wrong?

Answer 1

byte[] bits = Convert.ToByte(ds.Tables[0].Rows[0][0]);

Answer 2

Item is not an indexer, it's a function. You should do:

byte[] bits = Convert.ToByte(ds.Tables[0].Rows[0].Item(0));

Or if you want item at 0,0 position in your table0 you can do:

byte[] bits = Convert.ToByte(ds.Tables[0].Rows[0][0]);

Answer 3

Use:

byte[] bits = Convert.ToByte(ds.Tables[0].Rows[0][0]);

ds.Tables[0].Rows[0] returns DataRow which has indexer this[int] which returns data stored in the column by index.