如何从.net核心中的appsettings.json中提取列表 [英] How to extract a list from appsettings.json in .net core

问题描述

我有一个appsettings.json文件，看起来像这样：

I have an appsettings.json file which looks like this:

{
    "someSetting": {
        "subSettings": [
            "one",
            "two",
            "three"
         ]
    }
}

当我建立我的配置根目录时，做类似 config [ someSetting：subSettings]的操作它返回null，实际的可用设置是这样的：

When I build my configuration root, and do something like config["someSetting:subSettings"] it returns null and the actual settings available are something like this:

config [ someSettings：subSettings：0 ]

是否有更好的方法来检索 someSettings：subSettings 的内容，

Is there a better way of retrieving the contents of someSettings:subSettings as a list?

推荐答案

您可以使用Configuration绑定程序来获得配置源的强类型表示。

You can use the Configuration binder to get a strong type representation of the configuration sources.

这是我之前编写的测试的一个示例，希望对您有所帮助。

This is an example from a test that I wrote before, hope it helps:

    [Fact]
    public void BindList()
    {
        var input = new Dictionary<string, string>
        {
            {"StringList:0", "val0"},
            {"StringList:1", "val1"},
            {"StringList:2", "val2"},
            {"StringList:x", "valx"}
        };

        var configurationBuilder = new ConfigurationBuilder();
        configurationBuilder.AddInMemoryCollection(input);
        var config = configurationBuilder.Build();

        var list = new List<string>();
        config.GetSection("StringList").Bind(list);

        Assert.Equal(4, list.Count);

        Assert.Equal("val0", list[0]);
        Assert.Equal("val1", list[1]);
        Assert.Equal("val2", list[2]);
        Assert.Equal("valx", list[3]);
    }

重要的部分是对 Bind的调用。

测试和更多示例在 GitHub

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