使用 AppSetting 读取配置文件答案

【问题标题】：Read Config File using AppSetting使用 AppSetting 读取配置文件
【发布时间】：2017-06-16 11:07:57
【问题描述】：

我已使用 ConfigurationManager 类将我的应用程序设置存储在配置文件中，我的配置文件位于自定义路径中，现在我想读取我的配置文件但我的代码不起作用。我应该如何更改我的代码？

存储配置文件（完美运行）：

static void AddUpdateAppSettings2(string key, string value)
{
    try
    {
        string _path = Application.StartupPath + "\\ss.ini";
        ExeConfigurationFileMap configFileMap = new ExeConfigurationFileMap()
        {
            ExeConfigFilename = _path
        };
        Configuration configFile = ConfigurationManager.OpenMappedExeConfiguration(configFileMap, ConfigurationUserLevel.None);
        var settings = configFile.AppSettings.Settings;
        if (settings[key] == null)
        {
            settings.Add(key, value);
        }
        else
        {
            settings[key].Value = value;
        }
        configFile.Save(ConfigurationSaveMode.Modified);
        ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name);
    }
    catch (ConfigurationErrorsException)
    {
        Console.WriteLine("Error writing app settings");
    }
}

读取配置文件（不起作用，仅当我的配置文件存储为默认路径时才有效）：

static void ReadSetting(string key)
{
    try
    {
        var appSettings =ConfigurationManager.AppSettings;
        string result = appSettings[key] ?? "Not Found";
        Console.WriteLine(result);
    }
    catch (ConfigurationErrorsException)
    {
        Console.WriteLine("Error reading app settings");
    }
}

【问题讨论】：

“我的书面代码不起作用我必须如何更改我的代码？” - 你能告诉我们什么不起作用吗？它在做什么或不做什么？
我尝试从路径读取我的配置文件 (Application.StartupPath + "\\ss.ini")
但我的 ReadSetting func 从默认路径读取配置文件 (application.exe.config)

标签： c# config configuration-files configurationmanager

【解决方案1】：

作为转换，app.config 文件始终以application_name.config 名称存储在应用程序路径中。

如果您想将配置存储在自定义路径中，请考虑使用单独的 XML 文件绕过 app.config 文件。以下是示例代码：

internal sealed class AppSettingsSerializer
{
    private AppSettingsSerializer() { }

    static int BufferSize { get { return 4096; } }

    internal static AppSettings GetAppSettings(string filePath)
    {
        if(File.Exists(filePath) == false)
            return new AppSettings();

        XmlSerializer xmlSerializer = new XmlSerializer(typeof(AppSettings));
        using(FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.None, BufferSize, FileOptions.SequentialScan))
        {
            XmlReader xmlReader = XmlReader.Create(fileStream);
            return (AppSettings)xmlSerializer.Deserialize(xmlReader);
        }
    }

    internal static void SetAppSettings(string filePath, AppSettings appSettings)
    {
        XmlSerializerNamespaces xmlSerializerNamespaces = new XmlSerializerNamespaces();
        xmlSerializerNamespaces.Add("", "");

        XmlSerializer xmlSerializer = new XmlSerializer(typeof(AppSettings));
        using(FileStream fileStream = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.Write, FileShare.None, BufferSize, FileOptions.WriteThrough))
        {
            XmlWriterSettings xmlWriterSettings = new XmlWriterSettings();
            xmlWriterSettings.Indent = true;
            xmlWriterSettings.NewLineOnAttributes = true;

            XmlWriter xmlWriter = XmlWriter.Create(fileStream, xmlWriterSettings);
            xmlSerializer.Serialize(xmlWriter, appSettings, xmlSerializerNamespaces);
        }
    }
}

public sealed class AppSettings
{
    public bool Setting1 { get; set; }
    public string Setting2 { get; set; }

    public AppSettings()
    {
        Setting1 = false;
        Setting2 = "localhost";
    }
}

以下是用法：

AppSettings appSettings = appSettings = AppSettingsSerializer.GetAppSettings(appSettingsFilePath);
AppSettingsSerializer.SetAppSettings(appSettingsFilePath, appSettings);

【讨论】：

【解决方案2】：

web.config 

<configuration>
  <appSettings>
 <add key="ConnectionString" value="your connectionstring"/>
  </appSettings>
</configuration>

.cs file

 string connectionstring= ConfigurationManager.AppSettings["your connectionstring name is called in web.config"].ToString();

【讨论】：