如何在Azure Function v2（核心）中静态使用ConfigurationBuilder？ [英] How to use ConfigurationBuilder staticly in an Azure Function v2 (core)?

问题描述

在将Azure Function从v1移植到v2时，使用配置管理器读取local.settings.json的方式有所变化。

While porting an Azure Function from v1 to v2 there is a change in how the configuration manager is used to read the local.settings.json.

以前，我使用以下代码在功能实例之间启用redis连接池：

Previously, I used the following code to enable redis connection pooling between function instances:

public static class Redis
{
    /// <summary>
    /// Initializes the REDIS connection.
    /// </summary>
    private static readonly Lazy<ConnectionMultiplexer> LazyConnection = new Lazy<ConnectionMultiplexer>(() =>
    {
        return ConnectionMultiplexer.Connect(ConfigurationManager.AppSettings["CacheConnection"]);
        });

    public static IDatabase Database => LazyConnection.Value.GetDatabase();
}

但是在v2中，ConfigurationManager不再可用，我们必须使用类似：

However in v2 the ConfigurationManager is no longer available and we have to use something like:

new ConfigurationBuilder()
        .SetBasePath(context.FunctionAppDirectory)
        .AddJsonFile("local.settings.json", optional: true, reloadOnChange: true)
        .AddEnvironmentVariables()
        .Build();

但是，因为它需要 context 仅在函数运行时可用，我们无法创建在所有函数之间共享的静态类。可以在Azure Functions v2中静态读取app.settings.json吗？

However, because it requires the context which is only available during function runtime we cannot create a static class shared across all functions. Is it possible to read the app.settings.json statically in Azure Functions v2?

推荐答案

我们可以使用

var config = new ConfigurationBuilder()
    .AddEnvironmentVariables()
    .Build();
string cacheConnection = config["CacheConnection"];

或者简单地

Environment.GetEnvironmentVariable("CacheConnection");

local.settings.json （功能主机启动时，Azure上的应用程序设置也将自动注入到EnvironmentVariables中。

Values in local.settings.json(Also Application settings on Azure) are injected into EnvironmentVariables automatically when function host starts.

这篇关于如何在Azure Function v2（核心）中静态使用ConfigurationBuilder？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！