c# Dapper - 在 QueryAsync 方法上使用 linq

Question

Why can't I use .select on a queryAsync when it works fine on Query? For example, here the .select yells at me telling me it cant resolve the symbol "select":

var result = await sqlConnection.QueryAsync<Product>(procedure,
                            commandType: CommandType.StoredProcedure).Select(p => new Product
                        {
                            Code= (string)p.fldCode,
                            Name=(string)p.fldName
                            });

but as soon as i change to Query, it doesn't yell anymore. if anything it has trouble resolving the fldCode columns from the sp:

 var result = sqlConnection.Query<Product>(procedure,
                                commandType: CommandType.StoredProcedure).Select(p => new Product
                            {
                                Code= (string)p.fldCode,
                                Name=(string)p.fldName
                                });

why is this?

I asked a previous question here C# Dapper mapping columns to entity properties - "Cannot resolve symbol 'Select'"

Answer 1

Async methods return a Task (basically a placeholder for the eventual result of the async action). You need to await it to get the actual value

var result = (await sqlConnection.QueryAsync<Product>(
                 procedure,
                 commandType: CommandType.StoredProcedure
             )).Select(p => new Product
                {
                    Code= (string)p.fldCode,
                    Name=(string)p.fldName
                 }
             );