C#基于Autocad的二次开发(6.配置文件注入)

开始之前确保已完成步骤1创建解决方案和类库项目，并在对应项目中安装nuget包

通过Autofac注入.json配置文件，首先在ACD.Domain项目中创建配置文件实体，新建类文件AppSettingConfig.cs

/// <summary>
/// 配置项
/// </summary>
public class AppSettingConfig
{
    
}

ACD.Infrastructure项目中创建类文件Startup.cs，实现配置文件的单例注入

public static class Startup
{
    public static async Task<AppSettingConfig> AddAppConfig(this ContainerBuilder builder,string configFileName = "appsettings.json")
    {
        var configFile = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, configFileName);

        if (!File.Exists(configFile)) throw new FileNotFoundException($"{configFileName} 配置文件不存在");

        string jsonString;
        using (var stream = File.OpenRead(configFile))
        {
            var reader = new StreamReader(stream);
            jsonString = await reader.ReadToEndAsync();
        }

        var appSetting = JsonConvert.DeserializeObject<AppSettingConfig>(jsonString);

        builder
            .RegisterInstance(appSetting)
            .SingleInstance();

        return appSetting;
    }
}

ACD.Client项目中添加appsettings.json配置文件

{
  //"DbConfig": "123123"
}

ACD.Client项目中添加类文件AppInit.cs，通过Autofac注入

internal class AppInit
{
    private static IContainer Container;

    internal static async Task Init()
    {
        var builder = new ContainerBuilder();

        var config = await builder.AddAppConfig("appsettings.json");

        Container = builder.Build();
    }

    internal static T Resolve<T>() => Container.Resolve<T>();
}

使用方法：

   
//C/S端：

await AppInit.Init();

//B/S端：

将AppInit中的内容在Global.asax中或ApplicationStart中实现

//使用

AppSettingConfig config = AppInit.Resolve<AppSettingConfig>();

//or

public class ACDesign
{
   private readonly AppSettingConfig _config;

   public ACDesign(AppSettingConfig config) => _config = config;

   public void Demo()
   {
       // var dbConfig =  _config.DbConfig;_
   }
}