c# - 你能解释一下这个错误吗？

Question

Cannot implicitly convert type 'System.Collections.Generic.List<string>'
to 'System.Collections.Generic.List<Parts>'

下面是产生这个错误的代码。我很确定我在做一些愚蠢的事情。

public class Parts
{


public string computername { get; set; }


public List<Parts> GetParts()
{
    List<string> lst = new List<string>(); 
   //The object that will physically connect to the database 
   using(SqlConnection cnx = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["request"].ConnectionString))  
   { 
            //The SQL you want to execute 
       SqlCommand cmd = new SqlCommand("SELECT * FROM REQUESTS", cnx); 
           //Open the connection to the database 
           cnx.Open(); 
           //execute your command 
           SqlDataReader dataReader = cmd.ExecuteReader(); 
           { 
             //Loop through your results 
             while(dataReader.Read()) 
             { 
                lst.Add(Convert.ToString(dataReader["titlename"])); 
             } 
           } 
   } 
   return lst; 
} 

}

错误一直指向这一行:

   return lst; 

谢谢

Answer 1

您返回的是 List<string>当方法返回类型为 List<Part> 时.