EF SqlQuery参数错误

Question

Using

string sql = @"
SELECT TOP 50 *
FROM Log 
ORDER BY Date desc";
return context.Database.SqlQuery<Log>(sql).ToList();

work, but when i'm trying to insert parameter like

string sql = @"
SELECT TOP @top *
FROM Log 
ORDER BY @order";

List<object> parameters = new List<object>();
parameters.Add(new SqlParameter("top", top)); //top is int with value 50
parameters.Add(new SqlParameter("order", order)); //order is string with value Date desc

return context.Database.SqlQuery<Log>(sql, parameters.ToArray()).ToList();

I get

"Additional information: Incorrect syntax near '@top'.".

Where I wrong?

Answer 1

Rearrange your query as following

string sql = @"
SELECT TOP (@top) *
FROM Log 
ORDER BY @order";

EDIT

string sql = @"
SELECT TOP @top *
FROM Log 
ORDER BY ";

sql += order;

List<object> parameters = new List<object>();
parameters.Add(new SqlParameter("top", top)); //top is int with value 50

return context.Database.SqlQuery<Log>(sql, parameters.ToArray()).ToList();