C# App.config配置文件的讲解

using System;

using System.Collections.Generic;

using System.Collections;

using System.Linq;

using System.Text;

using System.Configuration;

namespace AppConfig

{

class Program

{

static void Main(string[] args)

{

Console.WriteLine("ConnectionStrings:");

// ConfigurationManager.ConnectionStrings是一个ConnectionStringSettingsCollection对象

// 按数字循环得到一个个ConnectionStringSettings对象

// 每个ConnectionStringSettings对象有Name和ConnectionString属性

for (int i = 0; i < ConfigurationManager.ConnectionStrings.Count; i++)

{

string name = ConfigurationManager.ConnectionStrings[i].Name;

string connectionString = ConfigurationManager.ConnectionStrings[i].ConnectionString;

Console.WriteLine(i.ToString() + ". " + name + " = " + connectionString);

}

//也可以如下操作，使用ConnectionStringSettings类型来进行foreach遍历

foreach (ConnectionStringSettings conn in ConfigurationManager.ConnectionStrings)

{

string name = conn.Name;

string connectionString = conn.ConnectionString;

Console.WriteLine(name + " = " + connectionString);

}

//直接获取conn的值

Console.WriteLine("\r\nGet the value of the node named \"conn\":");

Console.WriteLine(ConfigurationManager.ConnectionStrings["conn"].ConnectionString);

Console.WriteLine("");

Console.WriteLine("AppSettings:");

//AppSettings是NameValueConnection类型，使用AllKeys返回一个所有Key组成的字符串数组

string[] keys = ConfigurationManager.AppSettings.AllKeys;

for (int i = 0; i < keys.Length; i++)

{

string key = keys[i];

//通过Key来索引Value

string value = ConfigurationManager.AppSettings[key];

Console.WriteLine(i.ToString() + ". " + key + " = " + value);

}

// 没有NameValuePair这样的对象，所以无法使用foreach来进行循环

//直接获取key1的值

Console.WriteLine("\r\nGet the value of the key named \"key1\":");

Console.WriteLine(ConfigurationManager.AppSettings["key1"]);

//pause the process

Console.ReadKey();

}

}

}