NameValueSectionHandler - 我可以使用这个部分类型写回应用程序配置文件吗? [英] NameValueSectionHandler - can i use this section type for writing back to the application config file?

问题描述

回到为什么 .net 没有提供简单(我不想为 2 个值实现ConfigurationSection"ConfigurationElement"ConfigurationProperty")的方式来写回值的话题进入应用程序配置文件...(而且我不想使用用户"应用配置)

back to the topic of why didn't .net provide a simple (i don't want to implement "ConfigurationSection" "ConfigurationElement" "ConfigurationProperty" for 2 values) way to write values back into application config files... (and i don't want to use 'user' app config)

我想写入 app.config 值，我厌倦了上面的 key,value 方法 - 读取它很好，但我不能写回它(它说集合是只读的).即使提供了以下方法 -

i want to write to the app.config values, i tired the above method of key,value - for reading its fine but i can't write back into it (it says the collection is read only). even though the following method is supplied -

NameValueCollection.Set(string,string)

我在这里遗漏了什么吗?

am i missing something here ?

这是我尝试的方式:

 NameValueCollection nvc = (NameValueCollection)ConfigurationManager.GetSection("options");
 nvc.Set("SelectTimeOut", sqlTimeoutSpinBox.Value.ToString());

推荐答案

• 没有 -NameValueSectionHandler 不会帮助用户创建"将写入 app.config 文件的 Xml.

启动反射器并查看 System.Configuration.NameValueSectionHandler 上的以下方法:内部静态对象 CreateStatic(object parent, XmlNode section, string keyAttriuteName, string valueAttributeName).

Fire up reflector and take a look at the following method on System.Configuration.NameValueSectionHandler : internal static object CreateStatic(object parent, XmlNode section, string keyAttriuteName, string valueAttributeName).

来自 Microsoft 在线社区支持的 Linda Liu 在 EggHeadCafe 论坛的讨论中提供了一些关于 NameValueSectionHandler、IConfigurationSectionHandler 以及为什么将从 Configuration.GetSection(string) 返回 DefaultSection 实例的重要信息:System.Configuration.Configuration 的向后兼容性.

Linda Liu from Microsoft Online Community Support gives some great information about NameValueSectionHandler, IConfigurationSectionHandler, and why a DefaultSection instance will be returned from Configuration.GetSection(string) in a discussion at the EggHeadCafe forums: Backwards compatibility of System.Configuration.Configuration.

在技术上可以阅读和创建这些信息，但我建议您不要通过在配置 API 的这个极低级别进行交互而给自己带来不必要的痛苦.请仅将以下代码用于教育目的.我强烈建议您使用其中一种方法，例如 Richard 提到的使用声明式样式创建自定义 ConfigurationSection

It is technically possible to read, and create this information, but I recommend you not cause yourself more pain than you must by interacting at this extremely low level of the Configuration API. Please use the below code for Educational purposes only. I highly encourage you to use one of the methods like what Richard mentioned using the declarative style for creating a custom ConfigurationSection

app.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <section name="SingleTag" type="System.Configuration.SingleTagSectionHandler"/>
    </configSections>
    <SingleTag scheme="https" server="webmail.contoso.com" domain="CONTOSO" username="jdoe" password="iTz@s3Cr3t!"/>
</configuration>`

您可以阅读此配置部分，但这对您的心理健康不利.

You could read this configuration section, but it's not good for your mental health.

示例 C# 代码 - 将其粘贴到您的 void Main(string[] args) 中并抽烟.

Sample C# Code - Stick this inside your void Main(string[] args) and smoke it.

// Read configuration
Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
ConfigurationSection readableSection = config.GetSection("SingleTag");
string readableSectionRawXml = readableSection.SectionInformation.GetRawXml();
XmlDocument readableSectionRawXmlDocument = new XmlDocument();
readableSectionRawXmlDocument.Load(new StringReader(readableSectionRawXml));
SingleTagSectionHandler readableSectionHandler = new SingleTagSectionHandler();
Hashtable result = (Hashtable)readableSectionHandler.Create(null, null, readableSectionRawXmlDocument.DocumentElement);
foreach (string item in result.Keys)
{
    Console.WriteLine("{0}\t=\t{1}", item, result[item]);
}

// Create similar configuration section
Hashtable mySettings = new Hashtable();
mySettings.Add("key1", "value1:" + DateTime.Now);
mySettings.Add("key2", "value2:" + DateTime.Now);
mySettings.Add("key3", "value3:" + DateTime.Now);
mySettings.Add("keynull", null);
mySettings.Add("key4", "value4:" + DateTime.Now);
string rawData = string.Empty;
XmlDocument writableSectionXmlDocument = new XmlDocument();
XmlElement rootElement = writableSectionXmlDocument.CreateElement("CreateSingleTag");
foreach (var item in mySettings.Keys)
{
    if (mySettings[item] != null)
    {
        rootElement.SetAttribute(item.ToString(), mySettings[item].ToString());
    }
}
writableSectionXmlDocument.AppendChild(rootElement);

if (config.Sections.Get("CreateSingleTag") == null)
{
    ConfigurationSection writableSection = new DefaultSection();
    writableSection.SectionInformation.SetRawXml(writableSectionXmlDocument.OuterXml);
    config.Sections.Add("CreateSingleTag", writableSection);
}
else
{
config.Sections["CreateSingleTag"].SectionInformation.SetRawXml(writableSectionXmlDocument.OuterXml);
}

config.Save();

为了完整起见 -您需要以下用途

For completeness sake - you need the following usings

using System;
using System.Collections;
using System.Configuration;
using System.IO;
using System.Xml;

至少引用以下程序集

System
System.Configuration
System.Xml

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