如何从 .net core 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，如下所示:

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

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

当我构建我的配置根目录并执行诸如 config["someSetting:subSettings"] 之类的操作时，它返回 null 并且可用的实际设置如下所示:

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"]

是否有更好的方法将 someSettings:subSettings 的内容检索为列表?

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

推荐答案

您可以使用配置绑定器来获取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.

这是我之前写的一个测试的例子，希望对你有帮助:

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]);
    }

重要的部分是调用Bind.

测试和更多示例位于 GitHub

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