我試圖在運行時更新app.config文件。我得到錯誤在運行時更新app.config文件
System.NullReferenceException:對象引用未設置爲對象的實例。行59.
我想要做的是改變網址在運行時,通過彈出窗體,其中有一個用於URL的文本框,然後用於更新配置文件。
public void changeSettings()
{
Configuration config =
ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
KeyValueConfigurationCollection settings = config.AppSettings.Settings;
try
{
Console.WriteLine("nothing " + ConfigurationManager.AppSettings["client_postCodeRef_Service"]);
settings["client_postCodeRef_Service"].Value = textBox1.Text; <- line 59
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("applicationSettings");
Console.WriteLine("nothing 2 " + ConfigurationManager.AppSettings["client_postCodeRef_Service"]);
}
catch (ConfigurationErrorsException e)
{
MessageBox.Show("[Exception error: {0}]",
e.ToString());
}
}
這裏是配置文件
<applicationSettings >
<Client.Properties.Settings>
<setting name="client_postCodeRef_Service" serializeAs="String">
<value>http://127.0.0.1/directory/directory/webService.asmx</value>
</setting>
</Client.Properties.Settings>
</applicationSettings>
愚蠢的問題......你有你的appSettings集合「client_postCodeRef_Service」鍵?否則,訪問其Value屬性將拋出該異常。 –