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从配置中检索节。json在ASP。净5

config.json asp.net-core asp.net c#

Joshua Barron · 技术社区 · 11 年前

假设我有一个 config.json 这样地:

{
  "CustomSection": {
    "A": 1,
    "B": 2
  }
}

我知道我可以用 IConfiguration 对象以获得特定设置。, configuration.Get("CustomSection:A") ,但我可以获取整个层次结构(在任何类型中-即使是原始字符串也可以)吗?当我尝试 configuration.Get("CustomSection") ,我得到了 null 结果,所以我认为这是默认情况下不支持的。

我的用例是一次抓取整个配置字典,而不必抓取每个单独的设置——有些属性在编译时可能不知道。

6 回复 | 直到 11 年前

Michal Steyn 9 年前

我已经解决了一个类似的问题,我想将整个IConfigurationRoot或IConfiguration Section绑定到字典。下面是一个扩展类:

public class ConfigurationExtensions
{
    public static Dictionary<string, string> ToDictionary(this IConfiguration config, bool stripSectionPath = true)
    {
        var data = new Dictionary<string, string>();
        var section = stripSectionPath ? config as IConfigurationSection : null;
        ConvertToDictionary(config, data, section);
        return data;
    }

    static void ConvertToDictionary(IConfiguration config, Dictionary<string, string> data = null, IConfigurationSection top = null)
    {
        if (data == null) data = new Dictionary<string, string>();
        var children = config.GetChildren();
        foreach (var child in children)
        {
            if (child.Value == null)
            {
                ConvertToDictionary(config.GetSection(child.Key), data);
                continue;
            }

            var key = top != null ? child.Path.Substring(top.Path.Length + 1) : child.Path;
            data[key] = child.Value;
        }
    }
}

使用扩展名:

IConfigurationRoot config;
var data = config.ToDictionary();
var data = config.GetSection("CustomSection").ToDictionary();

有一个可选参数(stripSectionPath),用于保留整个节密钥路径,或将节路径剥离,留下相对路径。

var data = config.GetSection("CustomSection").ToDictionary(false);

Joe Audette 11 年前

配置Get用于获取值以获取所需的部分

IConfiguration mysection = configuration.GetConfigurationSection("SectionKey");

Adam Bruenderman 10 年前

我能够像这样加载和绑定具有未知键的多个子部分(自您发表文章以来,语法略有变化;我建议关注github项目及其单元测试,以了解其当前工作情况):

var objectSections = Configuration.GetSection("CustomObjects").GetChildren();
var objects = objectSections.ToDictionary(x => x.Key, x =>
{
    var obj = new CustomObject();
    ConfigurationBinder.Bind(x, obj);
    return obj ;
});

Joshua Barron 10 年前

编辑:更新Core 1.0版本的答案。

现在,如果使用强类型对象,这是可能的,例如:

public class CustomSection 
{
   public int A {get;set;}
   public int B {get;set;}
}

//In Startup.cs
services.Configure<CustomSection>(Configuration.GetSection("CustomSection"));
//You can then inject an IOptions instance
public HomeController(IOptions<CustomSection> options) 
{
    var settings = options.Value;
}

lisa 8 年前

有关详细说明,请参见 https://dotnetcodr.com/2017/01/20/introduction-to-asp-net-core-part-3-the-configuration-file/

以下是该网站的示例:

配置文件包含以下内容:

"Languages": {
  ".NET": [ "C#", "VB.NET", "F#" ],
  "JVM": ["Java", "Scala", "Clojure"]
}

按如下方式加载此配置:

IConfigurationSection languagesSection = configRoot.GetSection("Languages");
IEnumerable<IConfigurationSection> languagesSectionMembers = languagesSection.GetChildren();
Dictionary<string, List<string>> platformLanguages = new Dictionary<string, List<string>>();
foreach (var platform in languagesSectionMembers)
{
    List<string> langs = (from p in platform.GetChildren() select p.Value).ToList();
    platformLanguages[platform.Key] = langs;
}

Victor Hurdugaci 11 年前

您可以使用 ConfigurationBinder 并将所有内容读为 Dictionary<string, string>

以下是一些测试用例,可以作为示例: https://github.com/aspnet/Configuration/blob/dev/test/Microsoft.Framework.Configuration.Binder.Test/ConfigurationCollectionBindingTests.cs