在 Azure Functions v2 上使用 MySqlDatabase (MySql.Data.MySqlClient) - "Unable to resolve service"

Question

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

项目设置为还使用SwashBuckle库来创建可调用的 API。

当我从本地设置执行项目时，它工作正常。但是，当我将函数应用发布到 Azure 服务器并尝试在那里测试函数时，出现此错误：

系统无效操作异常：无法解析类型的服务 尝试激活时"MyFunctionApp.MySqlDatabase" 'MyFunctionApp.PostsService'.

在 Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp，类型类型，类型需要由，布尔值为默认参数必需(

。

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();
}
}
}

这是我调用的服务，它抛出了上述错误(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);
}
}
}

Answer 1

我最终将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>();
}
}
}