C# 通过反序列化读取 XML 配置文件

Question

我正在尝试创建一个非常简单的 class、object，其中在变量初始化阶段读取指定的 XML 文件，并使来自所述 XML 的值可用作只读属性。

所以我需要将它的路径作为字符串提供给以下结构：

<?xml version="1.0" encoding="utf-8"?>
<PLEXUpdateConfig>
    <Release>1</Release>
    <InstallPath>%ProgramW6432%</InstallPath>
    <CheckEveryXMinutes>20</CheckEveryXMinutes>
</PLEXUpdateConfig>

...然后像这样参考它：

Console.WriteLine("Release {0}, path {1}, interval {2} minutes", vConfigFile.Release, vConfigFile.InstallPath, vConfigFile.CheckEveryXMinutes);

现在我有这个 class：

public class PLEXUpdateConfig
{
    public uint Release { get; }
    public string InstallPath { get; }
    public uint CheckEveryXMinutes { get; }


    public class XMLStructure
    {
        public String Release { get; set; }
        public String InstallPath { get; set; }
        public String CheckEveryXMinutes { get; set; }

        public override string ToString()
        {
            return $"(Release: {Release}, InstallPath: {InstallPath}, CheckEveryXMinutes {CheckEveryXMinutes})";
        }
    }

    public PLEXUpdateConfig(string filePath)
    {
        XMLStructure vConfig;

        using (var reader = new StreamReader(filePath))
        {
            vConfig = (XMLStructure)new XmlSerializer(typeof(XMLStructure)).Deserialize(reader);
        }

        Release = (uint)int.Parse(vConfig.Release);
        InstallPath = vConfig.InstallPath;
        CheckEveryXMinutes = (uint)int.Parse(vConfig.CheckEveryXMinutes);

    }
}

...我正试图像这样从 Main 调用：

var vConfigFile = new PLEXUpdateConfig(vProgram.gReleaseFilePath);

而且它不起作用，抱怨保护级别：

Unhandled Exception: System.InvalidOperationException: plex_update_cmd.Program is inaccessible due to its protection level. Only public types can be processed.
   at System.Xml.Serialization.TypeDesc.CheckSupported()
   at System.Xml.Serialization.TypeScope.GetTypeDesc(Type type, MemberInfo source, Boolean directReference, Boolean throwOnError)
   at System.Xml.Serialization.TypeScope.ImportTypeDesc(Type type, MemberInfo memberInfo, Boolean directReference)
   at System.Xml.Serialization.TypeScope.GetTypeDesc(Type type, MemberInfo source, Boolean directReference, Boolean throwOnError)
   at System.Xml.Serialization.TypeScope.ImportTypeDesc(Type type, MemberInfo memberInfo, Boolean directReference)
   at System.Xml.Serialization.TypeScope.GetTypeDesc(Type type, MemberInfo source, Boolean directReference, Boolean throwOnError)
   at System.Xml.Serialization.ModelScope.GetTypeModel(Type type, Boolean directReference)
   at System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(Type type, XmlRootAttribute root, String defaultNamespace)
   at System.Xml.Serialization.XmlSerializer..ctor(Type type, String defaultNamespace)
   at System.Xml.Serialization.XmlSerializer..ctor(Type type)
   at plex_update_cmd.Program.PLEXUpdateConfig..ctor(String filePath) in ..\plex-update.cs:line 46
   at plex_update_cmd.Program.Main(String[] args) in ..\plex-update.cs:line 64

但是PLEXUpdateConfig class 和嵌套的 XMLStructure class 都尽可能公开，所以我真的不明白问题出在哪里。 请你帮助我好吗？

Answer 1

为什么声明一个内部 class 用于配置？ 在这种情况下，有独家新闻是正常的。 另外，内部的class有相同的变量名。

请试试这个

public class PLEXUpdateConfig
{
    public uint Release { get; }
    public string InstallPath { get; }
    public uint CheckEveryXMinutes { get; }


    public PLEXUpdateConfig(string filePath)
    {
        XMLStructure vConfig;

        using (var reader = new StreamReader(filePath))
        {
            vConfig = (XMLStructure)new XmlSerializer(typeof(XMLStructure)).Deserialize(reader);
        }

        Release = (uint)int.Parse(vConfig.Release);
        InstallPath = vConfig.InstallPath;
        CheckEveryXMinutes = (uint)int.Parse(vConfig.CheckEveryXMinutes);
    }
}

    public class XMLStructure
    {
        public String Release { get; set; }
        public String InstallPath { get; set; }
        public String CheckEveryXMinutes { get; set; }

        public override string ToString()
        {
            return $"(Release: {Release}, InstallPath: {InstallPath}, CheckEveryXMinutes {CheckEveryXMinutes})";
        }
   }

Answer 2

事实证明，它与嵌套到 PLEXUpdateConfig 中的 XMLStructure 无关。 它是 PLEXUpdateConfig 被嵌套到程序 class 中。显然它也是不允许的。 当我将 PLEXUpdateConfig 移到程序 class 之外时，一切正常