我无法访问配置文件中的值。
Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var clientsFilePath = config.AppSettings.Settings["ClientsFilePath"].Value;
// the second line gets a NullReferenceException
. config文件:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<!-- ... -->
<add key="ClientsFilePath" value="filepath"/>
<!-- ... -->
</appSettings>
</configuration>
你有什么建议我该怎么做吗?
当前回答
阅读配置:
您需要添加一个对Config的引用
打开项目上的“属性” 进入“设置”选项卡 添加“名称”和“值” 使用以下代码获取价值:
string value = Properties.Settings.Default.keyname;
保存到配置:
Properties.Settings.Default.keyName = value;
Properties.Settings.Default.Save();
其他回答
对于web应用程序，我通常会写这个方法，只是用键调用它。
private String GetConfigValue(String key)
{
return System.Web.Configuration.WebConfigurationManager.AppSettings[key].ToString();
}
你可以这样做:
string value1 = System.Configuration.ConfigurationManager.AppSettings.Get(0); //for the first key
string value2 = System.Configuration.ConfigurationManager.AppSettings.Get(1); //for the first key
或者你可以用
string value = system.configuration.ConfigurationManager.AppSettings.Get("ClientsFilePath");
//Gets the values associated with the specified key from the System.Collections.Specialized.NameValueCollection
你可以简单地输入:
string filePath = Sysem.Configuration.ConfigurationManager.AppSettings[key.ToString()];
因为key是一个对象，AppSettings接受一个字符串
我正在使用:
ExeConfigurationFileMap configMap = new ExeConfigurationFileMap();
//configMap.ExeConfigFilename = @"d:\test\justAConfigFile.config.whateverYouLikeExtension";
configMap.ExeConfigFilename = AppDomain.CurrentDomain.BaseDirectory + ServiceConstants.FILE_SETTING;
Configuration config = ConfigurationManager.OpenMappedExeConfiguration(configMap, ConfigurationUserLevel.None);
value1 = System.Configuration.ConfigurationManager.AppSettings["NewKey0"];
value2 = config.AppSettings.Settings["NewKey0"].Value;
value3 = ConfigurationManager.AppSettings["NewKey0"];
其中value1 =…和value3 =…给出null和value2 =…作品
然后我决定用以下内容替换内部app.config:
// Note works in service but not in wpf
AppDomain.CurrentDomain.SetData("APP_CONFIG_FILE", @"d:\test\justAConfigFile.config.whateverYouLikeExtension");
ConfigurationManager.RefreshSection("appSettings");
string value = ConfigurationManager.AppSettings["NewKey0"];
使用VS2012 .net
