小编mr-*_*taj的帖子

我需要AutoFac在ASP core 3.0中使用它

当我在启动时使用此代码时：

public IServiceProvider ConfigureServices(IServiceCollection services)
{
    services.AddControllers();
    return services.BuildAutofacServiceProvider();
}

它向我显示此错误：

'不支持返回System.IServiceProvider的ConfigureServices。

然后我通过以下方式更改program.cs：

public class Program
{
    public static void Main(string[] args)
    {
        CreateHostBuilder(args).Build().Run();
    }

    public static IHostBuilder CreateHostBuilder(string[] args) =>
        Host.CreateDefaultBuilder(args)
        .UseServiceProviderFactory(new AutofacServiceProviderFactory())
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStartup<Startup>();
            });
}

但这并没有解决。

这是BuildAutofacServiceProvider()代码：

public static IServiceProvider BuildAutofacServiceProvider(this IServiceCollection services)
{
    var ContainerBuilder = new ContainerBuilder();
    ContainerBuilder.Populate(services);
    ContainerBuilder.AddService();
    var container = ContainerBuilder.Build();

    return new AutofacServiceProvider(container);
}

我怎么解决这个问题？

我需要填写appsetting.jsonASP.NET Core 2.2 中的以下信息。

"SiteSetting": {
    "JwtSetting": {
      "SecretKey": "LongerThan-16Char-SecretKey",
      "Issuer": "MyWebsite",
      "Audience": "MyWebsite",
      "NotBeforeMinutes": "0",
      "ExpirationMinutes": "60"
    }
}

这是我的SiteSetting课：

public class SiteSetting
{
    public JwtSetting JwtSettings { get; set; }
}

public class JwtSetting
{
    public string SecretKey { get; set; }
    public string Issuer { get; set; }
    public string Audience { get; set; }
    public int NotBeforeMinutes { get; set; }
    public int ExpirationMinutes { get; set; }
}

我正在使用这段代码来Startup.cs填充 …

如果文件是图像，我需要调整文件上传的大小。

我写了调整大小的扩展：

 public static Image ResizeImage(this Image image, int width, int height)
    {
        var res = new Bitmap(width, height);
        using (var graphic = Graphics.FromImage(res))
        {
            graphic.InterpolationMode = InterpolationMode.HighQualityBicubic;
            graphic.SmoothingMode = SmoothingMode.HighQuality;
            graphic.PixelOffsetMode = PixelOffsetMode.HighQuality;
            graphic.CompositingQuality = CompositingQuality.HighQuality;
            graphic.DrawImage(image, 0, 0, width, height);
        }
        return res;
    }

这是 Upload Action :

 [HttpPost("UploadNewsPic"), DisableRequestSizeLimit]
    public IActionResult UploadNewsPic(IFormFile file)
    {
        if (file.IsImage())
        {

        }
        try
        {
            if (file.Length > 0)
            {
                string fileName = ContentDispositionHeaderValue.Parse(file.ContentDisposition).FileName.Trim('"');
                string fullPath = Path.Combine(_applicationRoot.UploadNewPath(), file.Name);
                using (var stream …

我需要在 ASP.NET Core 3.0 中使用代码优先创建一个数据库

这是DbContext：

public class TrelloContext : DbContext
{
    public TrelloContext(DbContextOptions options) : base(options)
    {
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        modelBuilder.AddDbSet<IEntity>(typeof(IEntity).Assembly);
        modelBuilder.ApplyConfigurationsFromAssembly(typeof(IType).Assembly);
    }
}

这是启动：

public void ConfigureServices(IServiceCollection services)
{
        services.AddControllers().AddControllersAsServices();
        services.AddDbContext<TrelloContext>(options => options.UseSqlServer(Configuration.GetConnectionString("SqlServer")));
        services.Injection();
}

这是我的连接字符串：

"ConnectionStrings": {
    "SqlServer": "Data Source=.;Initial Catalog=TrelloDB;Trusted_Connection=True;Trusted_Connection=True;"
}

当我使用这个时add-migration initial，我收到此错误：

值不能为空。（参数“键”）

有什么问题？我该如何解决这个问题？

我Stored Procedure在Sql Server中创建了这个：

SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE PROCEDURE [dbo].[usp_GetUsrsofRole] (@RoleId int)
AS
;WITH CTE_UsersInRole AS
(
    SELECT 
     U.Id AS [UserId], U.Name AS [UserName] , U.Family AS [UserFamily] , R.Id AS[RoleID],R.Name AS [RoleName]
    FROM AspNetUserRoles AU 
    INNER JOIN AspNetRoles R ON R.Id=AU.RoleId
    INNER JOIN AspNetUsers U ON U.ID=AU.UserId
)
SELECT
     C.RoleID,C.RoleName,C.UserFamily,C.UserId,C.UserName
FROM CTE_UsersInRole C
    WHERE C.RoleID=@RoleId
GO

这是我的视图模型：

public class UserInRoleVM
{
    public string UserName { get; set; }
    public string UserFamily { get; …

当我使用 Dapper 插入、更新或删除实体时，我需要返回id实体的。

我正在使用这段代码：

var role = await roleConnection.ExecuteAsync("UPDATE Role SET IsDelete = @isDelete, RoleName = @roleName, SecurityStamp = @securityStamp WHERE Role.Id = @id SELECT SELECT CAST(SCOPE_IDENTITY() AS INT)"
                     , new
                     {
                         isDelete = request.IsDelete = false,
                         roleName = request.RoleName,
                         securityStamp = Guid.NewGuid(),
                         id = request.Id
                     });

但它没有向我显示任何内容。

我怎样才能做到这一点？