C# app.config配置appSettings标签
AppSettings标签主要用于应用程中的一些配置信息。比如上传文件的路径,需要用到的可能会根据不同环境改变的一些常量等。可以在配置文件添加可执行文件要的配置。using System;
using System.Collections.Generic;
using System.Configuration;
class Program
{
static void Main(string[] args)
{
string valstr;
string bl;
bl =ReadAppSettings("Setting1",out valstr);
if (bl == "true")
Console.WriteLine("Setting1值:{0}", valstr);
else
Console.WriteLine("错误:" + bl);
bl = ReadAppSettings("Setting2", out valstr);
if (bl == "true")
Console.WriteLine("Setting2值:{0}", valstr);
else
Console.WriteLine("错误:" + bl);
bl = AddUpdateAppSettings("NewSetting", "May 7, 2014");
if (bl == "true")
Console.WriteLine("添加标签成功。");
else
Console.WriteLine("错误:" + bl);
bl = AddUpdateAppSettings("Setting1", "May 8, 2014");
if (bl == "true")
Console.WriteLine("修改标签成功。");
else
Console.WriteLine("错误:" + bl);
List<(string, string)> list;
bl = ReadAllAppSettings(out list);
if (bl == "true")
foreach (var val in list)
{
Console.WriteLine("键:{0}, 值:{1},", val.Item1, val.Item2);
}
else
Console.WriteLine("错误:" + bl);
Console.ReadKey();
}
/// <summary>
/// AppSettings标签读取全部值
/// </summary>
/// <param name="values">返回List<(string, string)>格式数据,使用out关键字。</param>
/// <returns>成功返回字符串“true”,失败返回原因。</returns>
public static string ReadAllAppSettings(out List<(string, string)> values)
{
values = null;
try
{
var appSettings = ConfigurationManager.AppSettings;
if (appSettings.Count == 0) { return "无AppSettings标签。"; }
values = new List<(string, string)>();
foreach (var key in appSettings.AllKeys)
{
values.Add((key, appSettings));
}
return "true";
}
catch (ConfigurationErrorsException err)
{
return err.Message;
}
}
/// <summary>
/// AppSettings标签读取指定值
/// </summary>
/// <param name="key">指定键</param>
/// <param name="val">输出值,使用out关键字</param>
/// <returns>成功返回字符串“true”,失败返回原因。</returns>
public static string ReadAppSettings(string key, out string val)
{
val = null;
try
{
var appSettings = ConfigurationManager.AppSettings;
val = appSettings;
if (val == null) return (key + "键值为空。");
if (val == "") return (key + "键值为空。");
return "true";
}
catch (ConfigurationErrorsException err)
{
return err.Message;
}
}
/// <summary>
/// AppSettings标签写入或更新配置数据
/// </summary>
/// <param name="key">键</param>
/// <param name="value">值</param>
/// <returns>成功返回字符串“true”,失败返回原因。</returns>
public static string AddUpdateAppSettings(string key, string value)
{
try
{
var configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
var settings = configFile.AppSettings.Settings;
if (settings == null)
settings.Add(key, value);
else
settings.Value = value;
configFile.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name);
return "true";
}
catch (ConfigurationErrorsException err)
{
return err.Message;
}
}
}第一次程序运行结果。
Setting1值:Not Found
Setting1值:Not Found
键:NewSetting, 值:May 7, 2014,
键:Setting1, 值:May 8, 2014,第一次程序运行后,ConsoleApp1.exe.Config数据,会创建标签,数据保存到标签内。
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="NewSetting" value="May 7, 2014" />
<add key="Setting1" value="May 8, 2014" />
</appSettings>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
</startup>
</configuration>第二次程序运行结果。
Setting1值:May 8, 2014
Setting1值:Not Found
键:NewSetting, 值:May 7, 2014,
键:Setting1, 值:May 8, 2014,ConsoleApp1.exe.Config数据没有改变。
来源:https://www.cnblogs.com/zwmwcjsj/p/18199740
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