用yamldotnet反序列化yaml错误

Question

我在玩yaml和YamlDotNet的游戏

但我有一个问题，反序列化一些，似乎很容易做到。

这是我的yaml文件：

---
# Folders to secure (with recursive content)
folders2Secure: 
 - .git
 - .vs

folders2Delete: 
 - packages
 - obj
 - bin
 - TestResults
 - node_modules
...

相关的C#对象：

public class FolderPreferences
{
    public List<string> Folders2Secure { get; set; }
    public List<string> Folders2Delete { get; set; }
}

使用此代码将其反序列化：

public class ConfigurationReader
{
    public FolderPreferences Read(string configurationFile)
    {
        var input = new StringReader(configurationFile);
        var deserializerBuilder = new DeserializerBuilder().WithNamingConvention(new CamelCaseNamingConvention());

        var deserializer = deserializerBuilder.Build();

        var result = deserializer.Deserialize<FolderPreferences>(input);
        return result;
    }
}

我有一个错误/堆栈竞赛：

YamlDotNet.Core.YamlException was unhandled
  HResult=-2146233088
  Message=(Line: 1, Col: 1, Idx: 0) - (Line: 1, Col: 19, Idx: 18): Exception during deserialization
  Source=YamlDotNet
  StackTrace:
       at YamlDotNet.Serialization.ValueDeserializers.NodeValueDeserializer.DeserializeValue(IParser parser, Type expectedType, SerializerState state, IValueDeserializer nestedObjectDeserializer) in C:\projects\yamldotnet\YamlDotNet\Serialization\ValueDeserializers\NodeValueDeserializer.cs:line 75
       at YamlDotNet.Serialization.ValueDeserializers.AliasValueDeserializer.DeserializeValue(IParser parser, Type expectedType, SerializerState state, IValueDeserializer nestedObjectDeserializer) in C:\projects\yamldotnet\YamlDotNet\Serialization\ValueDeserializers\AliasValueDeserializer.cs:line 134
       at YamlDotNet.Serialization.Deserializer.Deserialize(IParser parser, Type type) in C:\projects\yamldotnet\YamlDotNet\Serialization\Deserializer.cs:line 315
       at YamlDotNet.Serialization.Deserializer.Deserialize[T](TextReader input) in C:\projects\yamldotnet\YamlDotNet\Serialization\Deserializer.cs:line 257
       at Ebys.CleanFolders.Library.ConfigurationReader.Read[T](String configurationFile) in E:\WorkingGit\bitbucket\CleanFolders\Ebys.CleanFolders.Library\ConfigurationReader.cs:line 21
       at Ebys.CleanFolders.ConsoleUi.Program.Main(String[] args) in E:\WorkingGit\bitbucket\CleanFolders\Ebys.CleanFolders\Program.cs:line 27
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: 
       HResult=-2147467262
       Message=Invalid cast from 'System.String' to 'Ebys.CleanFolders.Library.FolderPreferences'.
       Source=mscorlib
       StackTrace:
            at System.Convert.DefaultToType(IConvertible value, Type targetType, IFormatProvider provider)
            at System.String.System.IConvertible.ToType(Type type, IFormatProvider provider)
            at System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider)
            at YamlDotNet.Serialization.Utilities.TypeConverter.ChangeType(Object value, Type destinationType, CultureInfo culture) in C:\projects\yamldotnet\YamlDotNet\Serialization\Utilities\TypeConverter.cs:line 128
            at YamlDotNet.Serialization.NodeDeserializers.ScalarNodeDeserializer.YamlDotNet.Serialization.INodeDeserializer.Deserialize(IParser parser, Type expectedType, Func`3 nestedObjectDeserializer, Object& value) in C:\projects\yamldotnet\YamlDotNet\Serialization\NodeDeserializers\ScalarNodeDeserializer.cs:line 96
            at YamlDotNet.Serialization.ValueDeserializers.NodeValueDeserializer.DeserializeValue(IParser parser, Type expectedType, SerializerState state, IValueDeserializer nestedObjectDeserializer) in C:\projects\yamldotnet\YamlDotNet\Serialization\ValueDeserializers\NodeValueDeserializer.cs:line 60
       InnerException: 

知道我做错了什么吗？

编辑的

GVim内的Hexa视图中的文件。

​

​

Answer 1

问题在于您正在创建一个StringReader，它是您指定的字符串的读取器，而不是文件的读取器。您需要使用File.OpenText或类似的API从文件中读取：

public FolderPreferences Read(string configurationFile)
{
    using (var input = File.OpenText(configurationFile))
    {
        var deserializerBuilder = new DeserializerBuilder().WithNamingConvention(new CamelCaseNamingConvention());

        var deserializer = deserializerBuilder.Build();

        var result = deserializer.Deserialize<FolderPreferences>(input);
        return result;
    }
}

Answer 2

我猜想文件开头有额外的内容被解释为包含单个字符串的初始文档，因此出现了异常。检查下面的小提琴，它使用您的代码并按预期工作：

https://dotnetfiddle.net/tilGHT

然后将其与本文档进行比较，其中在文档开始之前添加了其他文本：

https://dotnetfiddle.net/d72Jut

您可以尝试删除初始---，因为它是可选的。