非静态错误，找不到原因
我收到“非静态字段、方法或属性 Skirmer_Final.Nyhed.FK_Nyhed_ID.get 需要对象引用”错误。我不知道出了什么问题。
我的代码
public class Nyhed
{
public int FK_Status_ID { get; set; }
public int FK_Nyhed_ID { get; set; }
public static List<Nyhed> GetByStatus(int ID, SqlConnection connection)
{
List<Nyhed> result = new List<Nyhed>();
using (var command = new SqlCommand("Select FK_Nyhed_ID from Status_Kan_Se_Nyhed where FK_Status_ID=@id"))
{
command.Connection = connection;
command.Parameters.AddWithValue("id", ID);
SqlDataReader reader = command.ExecuteReader();
try
{
while (reader.Read())
{
Nyhed StatusKanSeNyhed = new Nyhed();
StatusKanSeNyhed.FK_Status_ID = ID;
StatusKanSeNyhed.FK_Nyhed_ID = reader.GetInt32(0);
result.Add(StatusKanSeNyhed);
}
}
finally
{
reader.Close();
}
foreach (Nyhed N in result)
{
N.status = Status.GetByID(FK_Status_ID, connection);
N.nyhed = Nyhed.GetByID(FK_Nyhed_ID, connection);
}
}
return result;
}
}
你能看到错误吗？
I'm getting an "An object reference is required for the non-static field, method, or property Skirmer_Final.Nyhed.FK_Nyhed_ID.get" error. And I can't figure out whats wrong.
My code
public class Nyhed
{
public int FK_Status_ID { get; set; }
public int FK_Nyhed_ID { get; set; }
public static List<Nyhed> GetByStatus(int ID, SqlConnection connection)
{
List<Nyhed> result = new List<Nyhed>();
using (var command = new SqlCommand("Select FK_Nyhed_ID from Status_Kan_Se_Nyhed where FK_Status_ID=@id"))
{
command.Connection = connection;
command.Parameters.AddWithValue("id", ID);
SqlDataReader reader = command.ExecuteReader();
try
{
while (reader.Read())
{
Nyhed StatusKanSeNyhed = new Nyhed();
StatusKanSeNyhed.FK_Status_ID = ID;
StatusKanSeNyhed.FK_Nyhed_ID = reader.GetInt32(0);
result.Add(StatusKanSeNyhed);
}
}
finally
{
reader.Close();
}
foreach (Nyhed N in result)
{
N.status = Status.GetByID(FK_Status_ID, connection);
N.nyhed = Nyhed.GetByID(FK_Nyhed_ID, connection);
}
}
return result;
}
}
Can you see the error?
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评论（4）
FK_Nyhed_ID是一个属性。因此，您需要通过一个对象来引用它。我猜问题出在这里：您之前在
StatusKanSeNyhed实例上引用了FK_Nyhed_ID，所以我猜您会想要引用N.FK_Nyhed_ID< /代码> 下面FK_Nyhed_IDis a property. As such, you need to reference it through an object. I'm guessing the problem is here:You previously referenced
FK_Nyhed_IDon theStatusKanSeNyhedinstance, so I'm guessing you'll want to referenceN.FK_Nyhed_IDbelow我猜您想编写
并添加缺少的
N.I guess the you wanted to write
and add the missing
N.FK_Status_ID是一个实例属性，因此无法从静态方法访问它。您可以将其设为静态或将方法更改为实例方法。
FK_Status_IDis an instance property so it cannot be accessed from a static method.You can either make it static or change your method to an instance method.
问题在于：
您正在尝试读取公共成员 FK_Status_ID，该成员只能通过对象的实例访问。
The problem is here:
You are trying to read public member FK_Status_ID, whitch is accessible only though an instance of an object.