C# 如何使用配置管理器
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How to use ConfigurationManager
提问by gbk
I want to use App.config for storing some setting. I tried to use the next code for getting a parameter from a config file.
我想使用 App.config 来存储一些设置。我尝试使用下一个代码从配置文件中获取参数。
private string GetSettingValue(string paramName)
{
return String.Format(ConfigurationManager.AppSettings[paramName]);
}
I also added System.Configurationfor it (I used a separate class), and in App.config file I have:
我还System.Configuration为它添加了（我使用了一个单独的类），并且在 App.config 文件中我有：
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<appSettings>
<add key ="key1" value ="Sample" />
</appSettings>
</configuration>
But I got an error while trying to use ConfigurationManager- ConfigurationManager can't exist in such context, but I already added System.Configuration. Or did I miss something?
但是我在尝试使用ConfigurationManager- 时出错ConfigurationManager can't exist in such context，但我已经添加了System.Configuration. 还是我错过了什么？
EDIT:
编辑：
class with config (full view)
带配置的类（完整视图）
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Configuration;
namespace browser
{
class ConfigFile
{
private string GetSettingValue(string paramName)
{
return String.Format(ConfigurationManager.AppSettings[paramName]);
}
}
}
EDIT2
编辑2
Add how it looks
添加它的外观
This means the problem is not during using ConfigurationMangerbut before - the program "says" that it "doesn't know such element" as I understand the error - the "Element ConfigurationManager" doesn't exist in such context"
这意味着问题不在使用期间，ConfigurationManger而是在使用之前 - 程序“说”它“不知道这样的元素”，因为我理解错误 - “元素配置管理器”不存在于这种上下文中”
EDIT3
编辑3
EDIT 4
编辑 4
采纳答案by Mike Perrenoud
Okay, it took me a while to see this, but there's no way this compiles:
好的，我花了一段时间才看到这个，但无法编译：
return String.(ConfigurationManager.AppSettings[paramName]);
You're not even calling a method on the Stringtype. Just do this:
你甚至没有在String类型上调用方法。只需这样做：
return ConfigurationManager.AppSettings[paramName];
The AppSettingsKeyValuePair already returns a string. If the name doesn't exist, it will return null.
该AppSettingsKeyValuePair已经返回一个字符串。如果名称不存在，它将返回null。
Based on your edit you have not yet added a Referenceto the System.Configurationassembly for the project you're working in.
根据您的编辑，您尚未为您正在处理的项目的程序集添加引用System.Configuration。
回答by user3093469
I found some answers, but I don't know if it is the right way.This is my solution for now. Fortunatelly it didn′t broke my design mode.
我找到了一些答案，但我不知道这是否正确。这是我现在的解决方案。幸运的是它没有打破我的设计模式。
`
/// <summary>
/// set config, if key is not in file, create
/// </summary>
/// <param name="key">Nome do parametro</param>
/// <param name="value">Valor do parametro</param>
public static void SetConfig(string key, string value)
{
var configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var settings = configFile.AppSettings.Settings;
if (settings[key] == null)
{
settings.Add(key, value);
}
else
{
settings[key].Value = value;
}
configFile.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name);
}
/// <summary>
/// Get key value, if not found, return null
/// </summary>
/// <param name="key"></param>
/// <returns>null if key is not found, else string with value</returns>
public static string GetConfig(string key)
{
return ConfigurationManager.AppSettings[key];
}`
回答by Luis Armando Alquichire
Go to tools>> nuget>> consoleand type:
转到tools>> nuget>>console并键入：
Install-Package System.Configuration.ConfigurationManager
If you want a specific version:
如果你想要一个特定的版本：
Install-Package System.Configuration.ConfigurationManager -Version 4.5.0
Your ConfigurationManagerdllwill now be imported and the code will begin to work.
您的ConfigurationManagerdll现在将被导入，代码将开始工作。
