如何从列表中的多列添加字符串值<string> c# windows forms</string>

Question

I'm trying to create List of strings from a SQL Server database table.

Here is my stored procedure:

ALTER PROCEDURE [dbo].[spCountry_GetCountryDataById]
    @CountryId int
AS
BEGIN
    SET NOCOUNT ON;

    -- Insert statements for procedure here
    SELECT 
        CountryName, Continent, Population, Capital, 
        Language, Religion, Currency, DishName 
    FROM
        Country 
    WHERE 
        id = @CountryId
END

And this is my method for query:

public static List<string> GetCountryDataByCountryId(int countryId)
{
    List<string> countryData = new List<string>();

    using (IDbConnection connection = new SqlConnection(CnnString("MathemaKids")))
    {
        DynamicParameters p = new DynamicParameters();
        p.Add("CountryId", countryId);

        countryData = connection.Query<string>("spCountry_GetCountryDataById", p, commandType: CommandType.StoredProcedure).ToList();
    }

    return countryData;
}

So, I'm expecting 8 strings in my list, but when I run this it returns only first string ( CountryName ).

Where is the problem, anyone?

Answer 1

Create a class that corresponds- maps to your table structure. Try, like:

public class Country
{
  //I have defined all as strings, better to define them corresponding to your table datatypes
  public string CountryName {get;set;}
  public string Continent {get;set;}
  public string Population {get;set;}
  public string Capital {get;set;} 
  public string Language {get;set;}
  public string Religion {get;set;}
  public string Currency {get;set;}
  public string DishName {get;set;}
}

public static List<Country> GetCountryDataByCountryId(int countryId)
{
   List<Country> countryData = new List<Country>();
   using (IDbConnection connection = new SqlConnection(CnnString("MathemaKids")))
   {
       DynamicParameters p = new DynamicParameters();
       p.Add("CountryId", countryId);
        countryData = connection.Query<string>("spCountry_GetCountryDataById", p, commandType: CommandType.StoredProcedure).ToList();
    }
   return countryData;
}