找不到密钥wp7

Question

当我想按下按钮，它会给我错误“找不到密钥”。我想有变量“dzien”的缺省值= 0。

Imports System.IO.IsolatedStorage 

Partial Public Class _1 
Inherits PhoneApplicationPage 
Private dzien As Integer 

Public Sub New() 
    InitializeComponent() 

End Sub 

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles Button2.Click 
    dzien = CInt(IsolatedStorageSettings.ApplicationSettings("dzien")) 
    Try 
     dzien = CInt(IsolatedStorageSettings.ApplicationSettings("dzien")) 
    Catch ex As KeyNotFoundException 
     dzien = 0 
    End Try 
    If dzien = 0 Then 
     TextBox1.Text += "dzien jest 0 !" 
    End If 
End Sub 
Private Sub Class_1_Unloaded(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles Me.Unloaded 
    IsolatedStorageSettings.ApplicationSettings("dzien") = dzien 
End Sub 

末级

Answer 1

卸下第一dzien = CInt(IsolatedStorageSettings.ApplicationSettings("dzien"))线。它应该看起来像这样：

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles Button2.Click 
    Try 
     dzien = CInt(IsolatedStorageSettings.ApplicationSettings("dzien")) 
    Catch ex As KeyNotFoundException 
     dzien = 0 
    End Try 
    If dzien = 0 Then 
     TextBox1.Text += "dzien jest 0 !" 
    End If 
End Sub