Let's break down the error:
No mapping
So we're dealing with some conversion between values.
System.Int32[]
So the source data is of type
int32[]
which would be
diagnostic_data
given your code.
known managed provider native type.
A type that the SQL adapter (the provider) you're using knows about for the database. As in, it doesn't know of a database type that it can use in this situation.
So putting it all together:
int32[]
has no native database type it can convert into. This makes complete sense. When you use
AddWithValue
, you're creating an
SqlParameter[
^]. An
SqlParameter
is treated as a single literal value for safety reasons (sql injection). Since an array of integers has no obvious
single literal value it can convert into, you get the error.
So how to fix it? I rather like
this solution[
^] found right here on CodeProject. You could also manually build an array of SqlParameters, something like:
SqlCommand cmd = new SqlCommand("INSERT INTO Table_1 VALUES(@value0, @value1)");
List<SqlParameter> commands = new List<SqlParameter> {
new SqlParameter("@value0", diagnostic_data[0]),
new SqlParameter("@value1", diagnostic_data[1])
};
cmd.Parameters.AddRange(commands);
To my knowledge though, there's no way to do this with a single parameter due to the way parameters are handled for safety.