手把手教你写dotnet core(读取配置文件)

李国宝

发布于 2020-01-02 17:05:42

2.1K0

发布于 2020-01-02 17:05:42

文章被收录于专栏：编程技术向北，人生删除指南

dotnet core(读取配置文件)

第一篇:手把手教你写dotnet core(入门篇)

第二篇:手把手教你ASP.NET Core

今天我们来学习怎么读取dotnet core程序的配置文件.

一般dotnet core配置文件都位于项目目录下,名为appsettings.json

直接读文件

{
    "MySQLConnectionString": "server=mysql地址;port=端口号;database=数据库名字;uid=账号;pwd=密码;charset='utf-8';Allow User Variables=True;Connection Timeout=30;SslMode=None;",
    "RedisConnectionString": "redis数据库地址:端口,name=名字,keepAlive=1800,syncTimeout=10000,connectTimeout=360000,password=访问密码,ssl=False,abortConnect=False,responseTimeout=360000,defaultDatabase=1",
    "EmailAccount": "QQ邮箱账号",
    "EmailPassword": "QQ邮箱密码",
    "EmailSMTPDomain": "smtp.qq.com",
    "EmailSMTPPort": 587,
    "SenderAddress": "QQ邮箱账号",
    "ReceiverAddress": "QQ邮箱账号",
    "ReceiverName": "liguobao-test",
    "EncryptionConfigCIV": "加密向量,16个16进制数字",
    "EncryptionConfigCKEY": "加密秘钥,16个16进制数字",
    "ESURL":"http://127.0.0.1:9201/",
    "ESUserName":"",
    "ESPassword":"",
    "QQAPPID":"",
    "QQAPPKey":"",
    "QQAuthReturnURL":""
}

那么我们直接去读json然后序列化成对象是不是就可以了.

没毛病,确实是可以这样玩的. 代码大概是这样的…


public class AppSettings
{
    public string MySQLConnectionString {get;set;}

    public string RedisConnectionString {get;set;}

    // ....
}

public AppSettings JsonHelper(string jsonFilePath)
{
    _movieJsonFilePath = jsonFilePath;
    if (!File.Exists(jsonFilePath))
    {
        var pvFile = File.Create(jsonFilePath);
        pvFile.Flush();
        pvFile.Dispose();
        return;

    }
    using (var stream = new FileStream(jsonFilePath, FileMode.OpenOrCreate))
    {
        try
        {
            StreamReader sr = new StreamReader(stream);
            JsonSerializer serializer = new JsonSerializer
            {
                NullValueHandling = NullValueHandling.Ignore,
                Converters = { new JavaScriptDateTimeConverter() }
            };
            //构建Json.net的读取流  
            using (var reader = new JsonTextReader(sr))
            {
                return serializer.Deserialize<AppSettings>(reader);
            }

        }
        catch (Exception ex)
        {
            return null;
        }
    }
}

直接读文件然后反序列化实在有点麻烦,有没有简单点的办法啊.

客官,只要给钱什么都有.

使用ConfigurationBuilder 读取

直接上代码:

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    var mySQLConnectionString = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
        .AddJsonFile("appsettings.json").Build()["MySQLConnectionString"];

    // ConnectionStrings节点下的MySQLConnectionString
    // var mySQLConnectionString = new ConfigurationBuilder()
    //         .SetBasePath(Directory.GetCurrentDirectory())
    //     .AddJsonFile("appsettings.json").Build()["ConnectionStrings:MySQLConnectionString"];
}

嗯,就是这么简单粗暴,什么都不管…

辣鸡,还有没有更优雅点的方法啊.

哦,这样的要求么?那么我们上DI(自动注入)吧.

DI读取配置文件

//Startup.cs
public IConfiguration Configuration { get; }

public Startup(IHostingEnvironment env)
{
    //够赞
    var builder = new ConfigurationBuilder()
        .SetBasePath(env.ContentRootPath)
        .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);
    Configuration = builder.Build();
}

 public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc();
    //将Configuration注入到APPConfiguration实例中
    services.AddOptions().Configure<AppSettings>(Configuration);
}

然后我们在Controller中使用构造函数注入的方式获取APPConfiguration实例

private AppSettings configuration;

public AccountController(IOptions<AppSettings> configurationOption)
{
    this.configuration = configurationOption.Value;
}

然后就可以愉快的使用了.

本文结束…

拜…

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原始发表：2018-07-01，如有侵权请联系 cloudcommunity@tencent.com 删除

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