對於需要配置的常量，在App.config中進行配置，格式為：

<add key="變數名" value="變數值">如：

1. <?xmlversion="1.0"encoding="utf-8"?>
2. <configuration>
3.   <appSettings>
4.     <addkey="SourceFolder"value="D:\CodeFolder\MysolutionTest"/>
5.     <addkey="FindingString"value="要搜尋的字串"/>
6.     <addkey="OutputFile"
   value="E:\test\result.txt"/>
7.   </appSettings>
8. </configuration>

在主程式中，需要讀取App.config檔案中配置的變數，採用
NameValueCollection appSettings = System.Configuration.ConfigurationManager.AppSettings;
來獲取各個變數名和變數值。如
NameValueCollection appSettings = System.Configuration.ConfigurationManager.AppSettings;
string path = appSettings["SourceFolder"];在主程式中，需要讀取App.config檔案中配置的變數，採用
NameValueCollection appSettings = System.Configuration.ConfigurationManager.AppSettings;
來獲取各個變數名和變數值。如

1. NameValueCollection appSettings = System.Configuration.ConfigurationManager.AppSettings;  
2. string path = appSettings["SourceFolder"];