XmlReader失败

Question

我试图使用.NET微框架在Netduino Plus 2上读取一个配置文件。我从Minerva 将设置保存到XML配置文件的博客文章中复制了大部分代码，唯一的区别是我有另一种方式访问我的SD卡。

private static void LoadConfiguration()
    {
        const string filePath = @"SD\\Application.config";
        using (Stream stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
        {
            ConfigurationManager.Load(stream);
        }
    }

SD卡上有一个文件"Application.config“，其中包含UTF8中的以下内容。

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
   <appSettings>
    <add key="Key1" value="Value1" />
    <add key="Key2" value="Value2" />
    <add key="Key3" value="Value3" />
    <add key="hostName" value="www.google.it" />
    <add key="port" value="25" />
    <add key="randomkey" value="randomvalue"/>
   </appSettings>
</configuration>

下面的代码在第3行出现了以下错误：“System.NotSupportedException类型的未处理异常发生在System.Xml.dll中”

public static class ConfigurationManager
{
private const string APPSETTINGS_SECTION = "appSettings";
private const string ADD = "add";
private const string KEY = "key";
private const string VALUE = "value";

private static Hashtable appSettings;

static ConfigurationManager()
{
    appSettings = new Hashtable();
}

public static string GetAppSetting(string key)
{
    return GetAppSetting(key, null);
}

public static string GetAppSetting(string key, string defaultValue)
{
    if (!appSettings.Contains(key))
    return defaultValue;
    return (string)appSettings[key];
}

public static void Load(Stream xmlStream)
{
    using (XmlReader reader = XmlReader.Create(xmlStream))
    {
        while (reader.Read())
        {
            switch (reader.Name)
            {
                case APPSETTINGS_SECTION:
                    while (reader.Read())
                    {
                        if (reader.Name == APPSETTINGS_SECTION)
                            break;

                        if (reader.Name == ADD)
                        {
                            var key = reader.GetAttribute(KEY);
                            var value = reader.GetAttribute(VALUE);

                            //Debug.Print(key + "=" + value);
                            appSettings.Add(key, value);
                        }
                    }

                    break;
            }
        }
    }
}

}

我错过了什么？

Answer 1

显然，这是不支持的，因为XmlReader太大，适合于Netduino的核心。:-(

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