如何用不同的方法创建类的实例

Question

我是否每次都要为不同的方法实例化描述？或者我应该使用静态？以下是我现在这样做的：处理这种情况的最佳方式是什么？似乎我重复了这一行：Dim description As BLLDescription = New BLLDescription()没有任何好的reasn。

Protected Sub Button8_Click(sender As Object, e As System.EventArgs) Handles Button8.Click 
      Dim description As BLLDescription = New BLLDescription() 
      List<String> = description.GetDescriptionWithoutNotes() 
      ..... 
     End Sub 

    Protected Sub Button9_Click(sender As Object, e As System.EventArgs) Handles Button9.Click 
     Dim description As BLLDescription = New BLLDescription() 
     List<String> = description.GetDescriptionWithNotes() 
     ..... 
    End Sub 
Protected Sub Button10_Click(sender As Object, e As System.EventArgs) Handles Button10.Click 
      Dim description As BLLDescription = New BLLDescription() 
      List<String> = description.GetAllDescriptions() 
      ..... 
     End Sub 

Answer 1

如果定义BLLDescription作为一个静态类，你可以调用GetAllDescriptions（）方法，而不必实例：

Protected Sub Button8_Click(sender As Object, e As System.EventArgs) Handles Button8.Click 
      List<String> = BLLDescription.GetDescriptionWithoutNotes() 
      ..... 
     End Sub 

    Protected Sub Button9_Click(sender As Object, e As System.EventArgs) Handles Button9.Click 
     List<String> = BLLDescription.GetDescriptionWithNotes() 
     ..... 
    End Sub 
Protected Sub Button10_Click(sender As Object, e As System.EventArgs) Handles Button10.Click 
      List<String> = BLLDescription.GetAllDescriptions() 
      ..... 
     End Sub 

Answer 2

这取决于什么的BLLDescription的实例确实和它是如何得到数据。

如果它一次又一次地访问相同的数据，你可以声明它是静态的。如果每个请求获得相同的数据，则将其作为类级别的属性。