Question

我正在玩yaml和YamlDotNet

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; }
}

使用此代码进行反序列化：

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;
    }
}

我有这个错误/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:

知道我做错了吗？

被修改

GVim中的Hexa视图中的文件。

Answer 1

我猜想文件开头会有额外的内容被解释为包含单个字符串的初始文档，因此是例外。检查以下小提琴，它使用您的代码并按预期工作：

https://dotnetfiddle.net/tilGHT

然后与此文件进行比较，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。

Answer 2

问题是您正在创建StringReader，它是您指定的字符串的读者，而不是文件的读者。您需要使用File.OpenText或类似的API来读取文件：

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;
    }
}

使用yamldotnet反序列化yaml时出错

2 个答案: