如何使用ConfigurationManager [英] How to use ConfigurationManager

问题描述

我想使用App.config来存储一些设置。
我试图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]）; 
} 
  

我也添加了 System.Configuration 为它（我使用一个单独的类），在App.config文件中我有：

 <？xml version =1.0encoding =utf-8？> 
< configuration> 
< startup> 
< supportedRuntime version =v4.0sku =。NETFramework，Version = v4.5/> 
< / startup> 
< appSettings> 
< add key =key1value =Sample/> 
< / appSettings> 
< / config> 
  

但我在尝试使用 ConfigurationManager时遇到错误 - ConfigurationManager不能存在于上下文中，但我已经添加了 System.Configuration 。

class with config（full） view）

 使用System; 
 using System.Collections.Generic; 
 using System.Linq; 
 using System.Text; 
 using System.Threading.Tasks; 
 using System.Configuration; 
 
命名空间浏览器
 {
 class ConfigFile 
 {
 private string GetSettingValue（string paramName）
 {
 return String.Format （ConfigurationManager.AppSettings [paramName]）; 
} 
} 
} 
  

EDIT2

添加外观

这意味着在使用 ConfigurationManger 但之前 - 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样的上下文

EDIT3

编辑4

解决方案

Okay，我花了一段时间看到这个，但是没有办法编译：

  return String。 AppSettings [paramName]）; 
  

你甚至不需要调用 String 类型。只需这样做：

 返回ConfigurationManager.AppSettings [paramName]; 
  

AppSettings KVP已返回字符串。如果名称不存在，它将返回 null 。

---

根据您的修改，您尚未<在 System.Configuration 程序集中添加引用。

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.

private string GetSettingValue(string paramName)
{
    return String.Format(ConfigurationManager.AppSettings[paramName]);
}

I also added System.Configuration for it (I used a separate class), and in App.config file I have:

<?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?

EDIT:

class with config (full view)

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

Add how it looks

This means the problem is not during using ConfigurationManger but 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"

EDIT3

EDIT 4

解决方案

Okay, it took me a while to see this, but there's not way this compiles:

return String.(ConfigurationManager.AppSettings[paramName]);

You're not even calling a method on the String type. Just do this:

return ConfigurationManager.AppSettings[paramName];

The AppSettings KVP already returns a string. If the name doesn't exist, it will return null.

---

Based on your edit you have not yet added a Reference to the System.Configuration assembly for the project you're working in.

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