Question

读取/写入App.config时遇到问题。

我在下面的代码中从MSDN文章（AppSettingsSection类）中获取 http://msdn.microsoft.com/en-us/library/system.configuration.appsettingssection%28v=vs.100%29.aspx

我已成功读取App.config文件并获取/使用这些值，如果我更改App.config文件以获取新值，它会正确响应。

但是，在此（从MS页面）我添加一个新条目并更改我的一个初始条目的值。它似乎改变它，保存它没有错误，但是没有将它写入文件，所以下次运行时，我回到App.config中的初始值。

有人能告诉我错误的方法吗？

TIA！

Imports System
Imports System.Collections.Specialized
Imports System.Configuration
Imports System.Text
Imports System.IO

' IMPORTANT: To compile this example, you must add to the project 
' a reference to the System.Configuration assembly.
'
Module Module1
    Sub Main()
        Dim KeypairHolder As String = Nothing
        ' Get Configuration File as config object
        Dim config As System.Configuration.Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)

        ' Create a unique key/value pair to add to the appSettings section.
        Dim keyName As String = "DateTimeStamp Number " & config.AppSettings.Settings.Count + 1
        Dim value As String = String.Concat(Date.Now.ToLongDateString(), " ", Date.Now.ToLongTimeString())

        ' Create appSettings as object
        Dim appSettings As System.Configuration.AppSettingsSection = config.AppSettings

        ' add the new key and value 
        appSettings.Settings.Add(keyName, value)

        ' save and refresh the values
        config.Save(ConfigurationSaveMode.Modified)

        ' Force a reload in memory of the changed section.
        ConfigurationManager.RefreshSection("appSettings")

        ' Get keys
        Dim kAll() As String = appSettings.Settings.AllKeys()

        ' Build string to display
        For Each key In kAll
            KeypairHolder = KeypairHolder & key & ":  " & appSettings.Settings(key).Value & vbCrLf
        Next

        'Display
        MsgBox(KeypairHolder)

        ' Change a value
        appSettings.Settings("CustomKey").Value = "Changed Value"

        ' Resave and get and display
        config.Save(ConfigurationSaveMode.Modified)
        ConfigurationManager.RefreshSection("appSettings")
        kAll = appSettings.Settings.AllKeys()
        KeypairHolder = Nothing
        For Each key In kAll
            KeypairHolder = KeypairHolder & key & ":  " & appSettings.Settings(key).Value & vbCrLf
        Next
        MsgBox(KeypairHolder)

    End Sub
End Module

' appSettings Section of my App.Config file
'   <appSettings>
'    <add key="UsernamePassword" value="BobsUsername:BobsPassword"/>
'    <add key="CustomKey" value="ConfigApp Value"/>
'  </appSettings>

Answer 1

右键单击解决方案资源管理器窗口中的app.config文件，然后选择属性选项。确保复制到输出目录属性未设置为始终复制。

无法写入App.Config文件

1 个答案: