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我创建了一个使用MySql.Data.MySqlClient依赖项的 Azure Functions 应用 ~v2 项目。

该项目设置为还使用该SwashBuckle库来创建可调用的 API。

当我从本地设置执行我的项目时，它工作正常。然而，当我将 Functions 应用程序发布到我们的 Azure 服务器并尝试在那里测试该函数时，我收到此错误：

System.InvalidOperationException：尝试激活“MyFunctionApp.PostsService”时，无法解析“MyFunctionApp.MySqlDatabase”类型的服务。

在 Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService（IServiceProvider sp，Type 类型，Type requiredBy，Boolean isDefaultParameterRequired）

...

我的StartUp.cs：

using System;
using System.Reflection;
using AzureFunctions.Extensions.Swashbuckle;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Hosting;
using Microsoft.Extensions.DependencyInjection;
using MyFunctionApp;

[assembly: WebJobsStartup(typeof(SwashBuckleStartup))]
namespace MyFunctionApp
{
    internal class SwashBuckleStartup : IWebJobsStartup
    {
        public void Configure(IWebJobsBuilder builder)
        {
            ConfigureServices(builder.Services);
            builder.AddSwashBuckle(Assembly.GetExecutingAssembly());
        }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddScoped<MySqlDatabase>(_ => new MySqlDatabase(Environment.GetEnvironmentVariable("MyFunctionApp-DbConn")));
        }
    }
}

我的MySqlDatabase.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;

namespace MyFunctionApp
{
    public class MySqlDatabase : IDisposable
    {
        public MySqlConnection Connection;

        public MySqlDatabase(string connectionString)
        {
            Connection = new MySqlConnection(connectionString);
            this.Connection.Open();
        }

        public void Dispose()
        {
            Connection.Close();
        }
    }
}

这是我正在调用的服务，它抛出了上面提到的错误（PostsService.cs）：

using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using System.Net;
using MySql.Data.MySqlClient;

namespace MyFunctionApp
{
    public class PostsService
    {
        private readonly MySqlDatabase _MySqlDatabase;

        public PostsService(MySqlDatabase mySqlDatabase)
        {
            _MySqlDatabase = mySqlDatabase;
        }

        [FunctionName("InsertIntoPost")]
        public async Task<IActionResult> InsertIntoPost(
            [HttpTrigger(AuthorizationLevel.Function, "post", Route = null)] PostClassObject request,
            ILogger log)
        {
            var cmd = _MySqlDatabase.Connection.CreateCommand() as MySqlCommand;
            cmd.CommandText = @"INSERT INTO PostsTable(ID) VALUES (12345)";

            int rowCount = await cmd.ExecuteNonQueryAsync();
            Console.WriteLine(String.Format("Number of rows inserted={0}", rowCount));

            return (ActionResult)new OkObjectResult(1);
        }
    }
}
4

1 回答 1

0

我最终将我的StartUp.cs分成两个文件。现在一切正常！

WebJobsStartup.cs：

using AzureFunctions.Extensions.Swashbuckle;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Hosting;
using System.Reflection;
using MyFunctionApp;

[assembly: WebJobsStartup(typeof(WebJobsStartup))]
namespace MyFunctionApp
{
    public class WebJobsStartup : IWebJobsStartup
    {
        public void Configure(IWebJobsBuilder builder)
        {
            builder.AddSwashBuckle(Assembly.GetExecutingAssembly());
        }
    }

}

MyFunctionAppStartUp.cs：

using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;
using System;

[assembly: FunctionsStartup(typeof(MyFunctionApp.MyFunctionAppStartup))]
namespace MyFunctionApp
{
    public class MyFunctionApp : FunctionsStartup
    {
        public override void Configure(IFunctionsHostBuilder builder)
        {
            builder.Services.AddTransient<MySqlDatabase>((s) =>
            {
                return new MySqlDatabase(Environment.GetEnvironmentVariable("MyFunctionApp-DbConn"));
            });
            builder.Services.AddSingleton<ServiceQueries>();
        }
    }
}
于 2019-12-09T19:07:05.757 回答