Question

我试图实现功能以允许用户选择他喜欢的表单。最喜欢的表格是他/她需要快速访问的表格。通过ToolStripMenu来避免浏览太长时间。

我尝试在应用程序配置中保存对表单的引用。但是我收到了错误

类型的价值＆＃39; System.Windows.Forms.Form＆＃39;无法转换为＆＃39;字符串＆＃39;

Public Sub SetSetting(ByVal pstrKey As String, ByVal frmFavorite As Form)
    Dim keyExists As Boolean = False
    For Each strKey As String In configuration.AppSettings.Settings.AllKeys
        If strKey.Equals(pstrKey) Then
            configuration.AppSettings.Settings.Item(pstrKey).Value = frmFavorite
            keyExists = True
        End If
    Next

    If Not keyExists Then
        configuration.AppSettings.Settings.Add(pstrKey, frmFavorite)
    End If
    configuration.Save(ConfigurationSaveMode.Modified)
    ConfigurationManager.RefreshSection("appSettings")
End Sub

Answer 1

您只能在应用程序配置文件中存储string值，不能存储任何对象但只需在配置文件中存储Form的名称。启动应用程序时，通过反射创建表单，如this对象工厂示例中所示。

Public Class ObjectFactory

  Public Shared Function CreateAnObject(ByVal ObjectName As String) As Object
        Dim Assem = [Assembly].GetExecutingAssembly()

        Dim myType As Type = Assem.GetType(ObjectName.Trim)
        Dim o As Object = Nothing
        Try
            o = Activator.CreateInstance(myType)
        Catch oEx As TargetInvocationException
            MessageBox.Show(oEx.ToString)
        End Try

        Return o
    End Function
End Class

...

Dim formName as String = configuration.AppSettings.Settings.Item(<YourSettingKey>)

Dim oForm As Form = _
        ObjectFactory.CreateAnObject(formName)

如何在Configuration of Winforms应用程序中保存对象？

1 个答案: