带有列变量的 EF Core FromSqlRaw

Question

Attempting to set the column as a parameter in FromRawSql . Query always returns null, I understand this is because the SQL is compiled before parameter values are set. How can I pass the column name into the query as a parameter?

What I'm trying:

var param = new SqlParameter[] {
                        new SqlParameter("@col", dataDiscriminator),
                        new SqlParameter("@value", itemDiscValue)
                    };

var thisq = context.Devices.FromSqlRaw("SELECT * FROM Devices WHERE @col = @value", param);                        
var thisDevice = thisq.SingleOrDefault();

Will produce the SQL:

DECLARE @col nvarchar(4) = N'Name';
DECLARE @value nvarchar(26) = N'Registration Template';

SELECT * FROM Devices WHERE @prop = @value

Answer 1

you can not use parameter for table or column name. Try this

var param = new SqlParameter[] {
                        new SqlParameter("@value", itemDiscValue)
                    };
var thisq = context.Devices.FromSqlRaw($"SELECT * from Devices WHERE {dataDiscriminator} = @value", param).ToList();                        
 var thisDevice = thisq.SingleOrDefault();

I don' t know where dataDiscriminator data from but always remember about the sql script injections.