这几天在玩个程序，突然看到c#采用图toml文件，好用，直观，确实也简单。
不过。。。。。。
github上示例写的
TOML to TomlTable
TOML input file:v
EnableDebug = true
[Server]
Timeout = 1m
[Client]
ServerAddress = "http://127.0.0.1:8080"
Code:
var toml = Toml.ReadFile(filename);
Console.WriteLine("EnableDebug: " + toml.Get<bool>("EnableDebug"));
Console.WriteLine("Timeout: " + toml.Get<TomlTable>("Server").Get<TimeSpan>("Timeout"));
Console.WriteLine("ServerAddress: " + toml.Get<TomlTable>("Client").Get<string>("ServerAddress"));
Output:
EnableDebug: True
Timeout: 00:01:00
ServerAddress: http://127.0.0.1:8080
TomlTable is Nett's generic representation of a TomlDocument. It is a hash set based data structure where each key is represented as a string and each value as a TomlObject.
Using the TomlTable representation has the benefit of having TOML metadata - e.g. the Comments - avAIlable in the data model.
很好用，于是改了个float类型的参数测试测试，魔咒来了。
Console.WriteLine("ServerAddress: " + toml.Get<TomlTable>("Client").Get<float>("floatXXX"));
读取一切正常，
下一步呢？修改修改？于是看来看去有个Update函数
toml.Get<TomlTable>("Server").Update("floatXXX",(double)fV);
噩梦，于是1.1存进去变成了值 1.00999999046326，怎么测试都不对，这是什么鬼
百度https://www.baidu.com/s?ie=UTF-8&tn=62095104_35_oem_dg&wd=1.00999999046326也有这个莫名其妙的数字
百思不得其解，然后下载了https://github.com/paiden/Nett源码看看：
// Values
public static Result<TomlBool> Update(this TomlTable table, string key, bool value)
=> Update(table, key, table.CreateAttached(value));
public static Result<TomlString> Update(this TomlTable table, string key, string value)
=> Update(table, key, table.CreateAttached(value));
public static Result<TomlInt> Update(this TomlTable table, string key, long value)
=> Update(table, key, table.CreateAttached(value));
public static Result<TomlFloat> Update(this TomlTable table, string key, double value)
=> Update(table, key, table.CreateAttached(value));
public static Result<TomlOffsetDateTime> Update(this TomlTable table, string key, DateTimeOffset value)
=> Update(table, key, table.CreateAttached(value));
public static Result<TomlDuration> Update(this TomlTable table, string key, TimeSpan value)
=> Update(table, key, table.CreateAttached(value));
琢磨出点门道来了，没有float类型啊，于是改为double，一切风平浪静，回归正常。
OMG，这个。。。。
得出个结论，c#用toml文件读取非整数字请用double，不要用float，decimal倒无所谓，反正编译不过，切记不要用float。
特此记录，避免打击迷茫，也算一个玩程序中的不太有用知识点，算是记录吧。
