C# 如何从 WinForms 中的 app.config 读取 AppSettings
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How to read AppSettings from app.config in WinForms
提问by John Ryann
I usually use a text file as a config. But this time I would like to utilize app.config to associate a file name (key) with a name (value) and make the names available in combo box
我通常使用文本文件作为配置。但是这次我想利用 app.config 将文件名（键）与名称（值）相关联，并使名称在组合框中可用
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="Scenario1.doc" value="Hybrid1"/>
<add key="Scenario2.doc" value="Hybrid2"/>
<add key="Scenario3.doc" value="Hybrid3"/>
</appSettings>
</configuration>
will this work? how to retrieve the data ?
这会起作用吗？如何检索数据？
回答by Gromer
Straight from the docs:
直接来自文档：
using using System.Configuration;
// Get the AppSettings section.
// This function uses the AppSettings property
// to read the appSettings configuration
// section.
public static void ReadAppSettings()
{
try
{
// Get the AppSettings section.
NameValueCollection appSettings = ConfigurationManager.AppSettings;
// Get the AppSettings section elements.
Console.WriteLine();
Console.WriteLine("Using AppSettings property.");
Console.WriteLine("Application settings:");
if (appSettings.Count == 0)
{
Console.WriteLine("[ReadAppSettings: {0}]",
"AppSettings is empty Use GetSection command first.");
}
for (int i = 0; i < appSettings.Count; i++)
{
Console.WriteLine("#{0} Key: {1} Value: {2}",i, appSettings.GetKey(i), appSettings[i]);
}
}
catch (ConfigurationErrorsException e)
{
Console.WriteLine("[ReadAppSettings: {0}]", e.ToString());
}
}
So, if you want to access the setting Scenario1.doc, you would do this:
所以，如果你想访问设置Scenario1.doc，你可以这样做：
var value = ConfigurationManager.AppSettings["Scenario1.doc"];
var value = ConfigurationManager.AppSettings["Scenario1.doc"];
Edit:
编辑：
As Gabriel GM said in the comments, you will have to add a reference to System.Configuration.
正如 Gabriel GM 在评论中所说，您必须添加对System.Configuration.
回答by Pavan Josyula
app settings in app.config are to store application/environment specific settings not to store data which binds to UI.
app.config 中的应用程序设置用于存储应用程序/环境特定的设置，而不是存储绑定到 UI 的数据。
If you cant avoid storing in config because of weird business requests I would rather stick to one single setting
如果由于奇怪的业务请求而无法避免存储在配置中，我宁愿坚持一个设置
<add key="FileDropDown" value="File1-Value|File2-Value" />
and write C# code to get this setting ConfigurationManager.AppSettings["FileDropDown"]and do some string Splits ('|') and ('-') to create kvp collection and bind it to UI.
并编写 C# 代码以获取此设置ConfigurationManager.AppSettings["FileDropDown"]并执行一些字符串拆分 ('|') 和 ('-') 以创建 kvp 集合并将其绑定到 UI。
