AppSettingsReader 构造函数
定义
初始化 AppSettingsReader 类的新实例。Initializes a new instance of the AppSettingsReader class.
public:
AppSettingsReader();
public AppSettingsReader ();
Public Sub New ()
示例
下面的示例创建一个包含节的配置文件 <appSettings> ,然后使用 AppSettingsReader 读取刚刚生成的设置。The following example creates a configuration file that contains the <appSettings> section, and then uses the AppSettingsReader to read the settings just generated.
using System;
using System.Configuration;
class Program
{
static void Main(string[] args)
{
var reader = new AppSettingsReader();
var stringSetting = reader.GetValue("String setting", typeof(string));
Console.WriteLine("String setting: " + stringSetting);
var dateTimeSetting = reader.GetValue("DateTime setting", typeof(DateTime));
Console.WriteLine("DateTime setting: " + dateTimeSetting);
try
{
var missingSetting = reader.GetValue("Int setting", typeof(Int32));
}
catch (InvalidOperationException e)
{
Console.WriteLine("Missing key error: " + e.Message);
}
Console.WriteLine("Press any key to continue");
Console.ReadKey();
}
}
下面的示例演示上一示例所使用的配置文件。The following example demonstrates a configuration file used by the previous example.
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<appSettings>
<add key="String setting" value="String retrieved from App.Config"/>
<add key="Date setting" value="Thursday, December 01, 2005 12:53:56 PM"/>
</appSettings>
</configuration>