在vNext中从appsetting.json读取启动后的连接字符串

本文介绍了在vNext中从appsetting.json读取启动后的连接字符串的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我有一个项目课程(Nuget软件包).我需要在没有构造函数的静态类中读取与MongoDB的连接字符串.

I have a project class (Nuget Package). I need to read in a static class without constructor my connections string to MongoDB.

静态类方法:

/// <summary> /// The default key MongoRepository will look for in the appsettings.json /// </summary> private const string DefaultConnectionstringName = "Data:MongoDB:MongoServerSettings"; /// <summary> /// Retrieves the default connectionstring from appsettings.json /// </summary> /// <returns>Returns the default connectionstring from the App.config or Web.config file.</returns> public static string GetDefaultConnectionString() { var config = new Configuration(); return config.Get<string>(DefaultConnectionstringName); }

我总是为空...如何在不使用DI的情况下获取Startup.cs之外的值?

I have always null... How can I obtain the value outside the Startup.cs without using DI?

有可能吗?

在我的旧代码中，我可以做类似的事情:

In my old code I could do something like that:

/// <summary> /// Retrieves the default connectionstring from the App.config or Web.config file. /// </summary> /// <returns>Returns the default connectionstring from the App.config or Web.config file.</returns> public static string GetDefaultConnectionString() { return ConfigurationManager.ConnectionStrings[DefaultConnectionstringName].ConnectionString; }

谢谢！

推荐答案

在启动过程中，应将连接字符串保存到Startup

Inside your startup, you should save the connection string to a static property on Startup

public class Startup { public static string ConnectionString { get; private set; } public Startup(IHostingEnvironment env) { // Set up configuration sources. var builder = new ConfigurationBuilder() .AddJsonFile("appsettings.json") .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true) .AddUserSecrets(); if (env.IsDevelopment()) { // For more details on using the user secret store see go.microsoft/fwlink/?LinkID=532709 builder.AddUserSecrets(); } builder.AddEnvironmentVariables(); Configuration = builder.Build(); ConnectionString = Configuration.Get<string>("Data:MongoDB:MongoServerSettings"); } // ... }

那么您应该可以从任何地方访问它:

Then you should be able to access it from wherever:

public static string GetDefaultConnectionString() { return Startup.ConnectionString; }