对于需要配置的常量，在App.config中进行配置，格式为：
<add key="变量名" value="变量值">如：
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1.<?xml version="1.0" encoding="utf-8" ?>
2.<configuration>
3. <appSettings>
4. <add key="SourceFolder" value="D:\CodeFolder\MysolutionTest
"/>
5. <add key="FindingString" value="要搜索的字符串"/>
6. <add key="OutputFile" value="E:\test\result.txt"/>
7. </appSettings>
8.</configuration>
在主程序中，需要读取App.config文件中配置的变量，采用NameValueCollection appSettings =
System.Configuration.ConfigurationManager.AppSettings;
来获取各个变量名和变量值。

如
NameValueCollection appSettings =
System.Configuration.ConfigurationManager.AppSettings;
string path = appSettings["SourceFolder"];在主程序中，需要读取
App.config文件中配置的变量，采用
NameValueCollection appSettings =
System.Configuration.ConfigurationManager.AppSettings;
来获取各个变量名和变量值。

如
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ValueCollection appSettings = System.Configuration.Configur
ationManager.AppSettings;
2.string path = appSettings["SourceFolder"];。