小编Ole*_*Aza的帖子

我正在使用带有实体框架的asp.net mvc并开始学习DDD.我正在研究包含调查的项目.这是我的域名模型:

public class Survey
{
    public int? SurveyID { get; set; }
    public string Name { get; set; }
    public decimal MinAcceptanceScore { get; set; }
    public int UserFailsCount { get; set; }

    public IEnumerable<SurveyQuestion> Questions { get; set; }
    public IEnumerable<Prize> Prizes { get; set; }
    public IEnumerable<SurveyAttempt> UserAttempts { get; set; }
}

我需要不同视图的不同部分调查,所以我创建了不同的ViewModel:

    public class ShortSurveyViewModel
    {
        public int? SurveyID { get; set; }
        public string Name { get; set; }
        public int UserFailsCount { get; …

我已切换到ASP.NET vNext beta6并开始尝试运行我的应用程序时收到以下异常:

Ninject.ActivationException: Error activating IOptions{MvcJsonOptions} using binding from IOptions{TOptions} to OptionsManager{TOptions}
A cyclical dependency was detected between the constructors of two services.

Activation path:
  4) Injection of dependency IOptions{MvcJsonOptions} into parameter jsonOptions of constructor of type MvcJsonMvcOptionsSetup
  3) Injection of dependency IConfigureOptions{MvcOptions} into parameter setups of constructor of type OptionsManager{MvcOptions}
  2) Injection of dependency IOptions{MvcOptions} into parameter optionsAccessor of constructor of type ControllerActionDescriptorProvider
  1) Request for IActionDescriptorProvider

Suggestions:
  1) Ensure that you have not declared a …

我允许用户动态创建输入字段。对于每个输入字段，我想将其连接到不同的 mat-autocomplete，以便它们彼此独立工作。我在这里遇到了障碍，因为我无法动态创建将自动完成连接到输入的元素引用（此处为#auto）。我该如何实现这一目标？

<div
  class="row"
  *ngFor="let field of getControls('requestFields'); let i = index"
  formArrayName="requestFields"
>
  <ng-container [formGroupName]="i">
    <div class="col-md-4">
      <mat-form-field class="example-full-width">
        <input
          type="text"
          placeholder="Name"
          matInput
          formControlName="reqName"
          matAutocomplete="auto"
        />
        <mat-autocomplete #auto="matAutocomplete">
          <mat-option
            *ngFor="let option of (filteredColumns | async)"
            [value]="option"
          >
            {{ option }}
          </mat-option>
        </mat-autocomplete>
      </mat-form-field>
    </div>
    <div class="col-md-2">
      <div class="togglebutton">
        <label>
          <span>Optional</span>
          <input type="checkbox" formControlName="reqOption" />
          <span class="toggle"></span>
        </label>
      </div>
    </div>
    <div class="col-md-4">
      <mat-form-field>
        <input
          matInput
          formControlName="reqValidations"
          placeholder="Validation"
          type="text"
        />
      </mat-form-field>
    </div>
  </ng-container>
</div>

我正在尝试使用Ninject自动注册AutoMapper配置文件.为此,我需要实例化从AutoMapper.Profile继承的类型的对象,例如:

public class WordMapping : Profile
{
    protected override void Configure()
    {
        Mapper.CreateMap<Datacontext.Entities.Word, Domain.Entities.Word>();
        Mapper.CreateMap<Domain.Entities.Word, Datacontext.Entities.Word>();
    }
}

首先,我试图通过反射来做到这一点,它就像一个魅力:

var profileType = typeof(AutoMapper.Profile);

var profiles = AppDomain.CurrentDomain.GetAssemblies()
                        .SelectMany(a => a.GetTypes())
                        .Where(t => profileType.IsAssignableFrom(t) && t.GetConstructor(Type.EmptyTypes) != null)
                        .Select(Activator.CreateInstance)
                        .Cast<Profile>();

foreach (var profile in profiles)
{
    Mapper.AddProfile(profile);
}

但是当我尝试用Ninject做同样的事情时:

public class MappingModules : NinjectModule
{
    public override void Load()
    {
        Kernel.Bind(scanner =>
        {
            scanner.FromAssembliesMatching("*")
                .SelectAllClasses()
                .InheritedFrom<AutoMapper.Profile>();
        });

        var profiles = Kernel.GetAll<Profile>();
        foreach (var profile in profiles)
        {
            Mapper.AddProfile(profile);
        }
    }
} …

是否有一种简单的方法可以为IEnumerable的每个成员添加前缀或后缀？除了(输入是IEnumerable)之外,我无法找到方法:

var sb = new StringBuilder();
foreach (var str in inputs) {
    str = sb.Append(prefix).Append(str).ToString();
    sb.clear();
}

但这不会让我回到str ...我觉得应该有更好的方法来做到这一点.