对象引用未设置为object.C＃asp的实例

Question

Line 19:     
static BalloonShopConnectionString1()

Line 20:  
   {

Line 21:
         dbConnectionString = ConfigurationManager.ConnectionStrings["BalloonShopConnection"].ConnectionString;

Line 22:
         dbProviderName = ConfigurationManager.ConnectionStrings["BalloonShopConnection"].ProviderName;

Line 23:         productsPerPage = System.Int32.Parse(ConfigurationManager.AppSettings["ProductsPerPage"]);

Line 21 Error

Answer 1

如果你的web.config中没有定义BalloonShopConnection，那么

null引用可能发生在21或22上