C# 回发后保留对象的值

下面的代码反序列化Config.xml并将对象值加载到网格中。问题是，当我选择一行时，它会激发

GridCustomers\u RowSelected

，但config对象为null。我理解这是因为每次我选择一行时，它都会发回并忘记config对象中的值

private Config config = null;

protected void Page_Load(object sender, EventArgs e)
{
   if (!Page.IsPostBack)
   {
       config = new Config();
       string file = @"C:\Config.xml";
       XmlData xmlData = new XmlData(file);
       config = xmlData.Deserialize();

       StoreCustomers.DataSource = config.Customers;
       StoreCustomers.DataBind();
    }
}

protected void GridCustomers_RowSelected(object sender, DirectEventArgs e) 
{ 
    string customerID = e.ExtraParams["ID"].ToString(); 
    string customerName = e.ExtraParams["Name"].ToString();

    Customer customer = new Customer();
    customer = config.Customers.Where( a=> a.ID == customerID).SingleOrDefault();

    StoreCompanies.DataSource = customer.Companies;
    StoreCompanies.DataBind();
}

解决这个问题的一个方法是将配置对象存储在会话或viewstate中。或者在

IsPostBack

块外反序列化对象。我想知道是否有其他更好的解决方案来保留config对象中的值

private Config config = null;

protected void Page_Load(object sender, EventArgs e)
{
   if (!Page.IsPostBack)
   {
       config = new Config();
       string file = @"C:\Config.xml";
       XmlData xmlData = new XmlData(file);
       config = xmlData.Deserialize();

       StoreCustomers.DataSource = config.Customers;
       StoreCustomers.DataBind();
    }
}

protected void GridCustomers_RowSelected(object sender, DirectEventArgs e) 
{ 
    string customerID = e.ExtraParams["ID"].ToString(); 
    string customerName = e.ExtraParams["Name"].ToString();

    Customer customer = new Customer();
    customer = config.Customers.Where( a=> a.ID == customerID).SingleOrDefault();

    StoreCompanies.DataSource = customer.Companies;
    StoreCompanies.DataBind();
}

或者在IsPostBack外部反序列化对象

这样做，反序列化并在IsPostBack之外创建它

protected void Page_Load(object sender, EventArgs e)
{
   config = new Config();
   string file = @"C:\Config.xml";
   XmlData xmlData = new XmlData(file);
   config = xmlData.Deserialize();

  if (!Page.IsPostBack)
   { 
       StoreCustomers.DataSource = config.Customers;
       StoreCustomers.DataBind();
    }
}