AppSettings从.config文件中获取值

Question

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办？

Answer 1

这对我有用:

string value = System.Configuration.ConfigurationManager.AppSettings[key];

Answer 2

dtsg给出的答案有效:

string filePath = ConfigurationManager.AppSettings["ClientsFilePath"];

但你需要添加一个程序集引用到

系统配置

转到解决方案资源管理器,右键单击 "引用",然后选择" 添加引用".选择组件选项卡并搜索配置.

这是我的App.config的一个例子:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
  <appSettings>
    <add key="AdminName" value="My Name"/>
    <add key="AdminEMail" value="MyEMailAddress"/>
  </appSettings>
</configuration>

您可以通过以下方式获得:

string adminName = ConfigurationManager.AppSettings["AdminName"];

Answer 3

放手一搏:

string filePath = ConfigurationManager.AppSettings["ClientsFilePath"];

Answer 4

从配置中读取:

您需要添加对Config的引用

1. 在项目中打开"属性"
2. 转到"设置"标签
3. 添加"名称"和"值"
4. 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();

Answer 5

我在用:

    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,value2 = ......有效

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 4

Answer 6

在app/web.config文件中设置以下配置：

<configuration>
  <appSettings>
    <add key="NameForTheKey" value="ValueForThisKey" />
    ... 
    ...    
  </appSettings>
...
...
</configuration>

然后您可以在代码中输入以下内容来访问此代码：

string myVar = System.Configuration.ConfigurationManager.AppSettings["NameForTheKey"];

*请注意，此功能适用于.net4.5.x和.net4.6.x; 但不工作.net core。最好的问候：拉斐尔