這樣可以重載一個方法嗎？

Question

我想讓人們使用他們的用戶名（int）或他們的用戶名（字符串）登錄。我想這樣做的方式是創建兩個獨立的方法，一個接受一個字符串，另一個接受一個int。但我無法讓這個工作，似乎可能有更好的解決方案。

public static string ForgotPassword (string username) 
{ 
    using (var conn = new SqlConnection(GetConnectionString())) 
    using (var cmd = conn.CreateCommand()) 
    { 
     conn.Open(); 
     cmd.CommandText = 
     @"SELECT 
      Password 
     FROM 
      Distributor 
     WHERE 
      Username = @username"; 
     cmd.Parameters.AddWithValue("@username", (string)username); 
     using (var reader = cmd.ExecuteReader()) 
     { 
      if (!reader.Read()) 
      { 
       // no results found 
       return null; 
      } 
      return reader.GetString(reader.GetOrdinal("Password")); 
     } 
    } 
} 

public static string ForgotPassword (int username) 
{ 
    using (var conn = new SqlConnection(GetConnectionString())) 
    using (var cmd = conn.CreateCommand()) 
    { 
     conn.Open(); 
     cmd.CommandText = 
     @"SELECT 
      Password 
     FROM 
      Distributor 
     WHERE 
      DistributorID= @username"; 
     cmd.Parameters.AddWithValue("@username", (int)username); 
     using (var reader = cmd.ExecuteReader()) 
     { 
      if (!reader.Read()) 
      { 
       // no results found 
       return null; 
      } 
      return reader.GetString(reader.GetOrdinal("Password")); 
     } 
    } 
} 

是什麼讓他們有USER_ID或用戶名登錄的最佳方式？

Answer 1

在您的第一個方法中，我會從該用戶名中獲取userId，然後將其傳遞給第二個方法。

如果用戶名與UserID不匹配，則以與用戶ID不存在時相同的方式返回錯誤。

public static string ForgotPassword (string username) 
{ 
    int userid = //Get userid from username 
    return ForgotPassword(userid); 
} 

public static string ForgotPassword (int username) 
{ 
    using (var conn = new SqlConnection(GetConnectionString())) 
    using (var cmd = conn.CreateCommand()) 
    { 
     conn.Open(); 
     cmd.CommandText = 
     @"SELECT 
      Password 
     FROM 
      Distributor 
     WHERE 
      DistributorID= @username"; 
     cmd.Parameters.AddWithValue("@username", (int)username); 
     using (var reader = cmd.ExecuteReader()) 
     { 
      if (!reader.Read()) 
      { 
       // no results found 
       return null; 
      } 
      return reader.GetString(reader.GetOrdinal("Password")); 
     } 
    } 
}