ASP.net core WEB APIでMongoDBを導入する

※あくまで一例です。

appsettings.json

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "MongoDBSettings": {
    "ConnectionString": "mongodb://localhost:27017",
    "DatabaseName": "MessageDatabase-RestfulAPI"
  },
  "AllowedHosts": "*"
}

Context/MongoDBContext

using Microsoft.Extensions.Configuration;
using MongoDB.Driver;
using RESTfulAPI_MessageSystemAPI.Models;

namespace RESTfulAPI_MessageSystemAPI.Context
{
    public class MongoDBContext
    {
        public readonly IMongoDatabase _database;

        public MongoDBContext(IConfiguration configuration)
        {
            var connectionString = configuration.GetSection("MongoDBSettings:ConnectionString").Value;
            var databaseName = configuration.GetSection("MongoDBSettings:DatabaseName").Value;

            var client = new MongoClient(connectionString);
            _database = client.GetDatabase(databaseName);
        }

        public IMongoCollection<UserModels> Users => _database.GetCollection<UserModels>("Users");
        public IMongoCollection<MessageModels> Messages => _database.GetCollection<MessageModels>("Messages");
    }
}

program.cs

using RESTfulAPI_MessageSystemAPI.Context;
using MongoDB.Driver;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddSingleton<MongoDBContext>();


builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();