我在运行项目并通过Register.cshtml视图发送POST时出错。请参阅以下错误：
InvalidOperationException：无法创建“AdoteRJ.Models.Adotante”类型的实例。模型绑定的复杂类型不能是抽象或值类型，并且必须具有无参数构造函数。或者，为'model'参数指定一个非null的默认值。 Microsoft.AspNetCore.Mvc.ModelBinding.Binders.ComplexTypeModelBinder.CreateModel（ModelBindingContext bindingContext）
在我重构MyEntity类（Adotante）之后，添加了一些复杂的类型，以使其成为一个丰富的域，这个错误就开始了。由于某些原因我还没有发现，这个错误已经开始，POST收到错误500，虽然表单数据已成功填写（我在开发工具的标题上检查了它）
我正在使用.NET Core 2.1
另外，我在下面发现了这个问题，同样的问题，但它的答案并没有解决它 - 如果你添加一个空的构造函数，错误消失，但表单被发送为空... Model bound complex types must not be abstract or value types and must have a parameterless constructor
我的代码：
public class Adotante : Entity
{
public Adotante(
Email email,
string senha,
NomeCompleto nomeCompleto,
string foto,
Lar lar
)
{
Email = email;
Senha = senha;
NomeCompleto = nomeCompleto;
Foto = foto;
Lar = lar;
}
public Email Email { get; private set; }
[DataType(DataType.Password)]
[StringLength(100, MinimumLength = 6)]
public string Senha { get; private set; }
public NomeCompleto NomeCompleto { get; private set; }
public string Foto { get; private set; }
public Lar Lar { get; private set; }
#region Adotante Métodos
public void SetEmail(Email email)
{
email = this.Email;
}
#endregion
}
我的一个ValueObject类的示例：
public class Email : ValueObject
{
public Email() { }
public Email(string enderecoEmail)
{
EnderecoEmail = enderecoEmail;
}
[Display(Name = "E-Mail")]
[Required(ErrorMessage = "Por favor, insira o e-mail do usuário/adotante")]
[EmailAddress]
public string EnderecoEmail { get; private set; }
}
}
我的Register.cshtml类上的表单：
<div class="row">
<form asp-controller="Account" asp-action="Register" asp-route-returnurl="@ViewData["ReturnUrl"]" method="post" class="form-horizontal">
<div class="col-md-1">
<!-- Gap between columns -->
</div>
<div class="col-md-4">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<div class="form-group">
<label asp-for="Email" class="control-label"></label>
<div class="input-group">
<span class="input-group-addon"><i class="material-icons">email</i></span>
<div class="form-line">
<input asp-for="Email.EnderecoEmail" class="form-control" />
<span asp-validation-for="Email" class="text-danger"></span>
</div>
</div>
</div>
<div class="form-group">
<label asp-for="Senha" class="control-label"></label>
<div class="input-group">
<span class="input-group-addon"><i class="material-icons">lock</i></span>
<div class="form-line">
<input asp-for="Senha" class="form-control" />
<span asp-validation-for="Senha" class="text-danger"></span>
</div>
</div>
</div>
<div class="form-group">
<label asp-for="NomeCompleto" class="control-label"></label>
<div class="input-group">
<span class="input-group-addon"><i class="material-icons">person</i></span>
<div class="form-line">
<input asp-for="NomeCompleto.Nome" class="form-control" />
<span asp-validation-for="NomeCompleto" class="text-danger"></span>
</div>
</div>
</div>
<div class="form-group">
<label asp-for="Foto" class="control-label"></label>
<div class="input-group">
<span class="input-group-addon"><i class="material-icons">insert_photo</i></span>
<div class="form-line">
<input asp-for="Foto" class="form-control" />
<span asp-validation-for="Foto" class="text-danger"></span>
</div>
</div>
</div>
<div class="form-group">
<label asp-for="Lar.RendaMensal" class="control-label"></label>
<div class="input-group">
<span class="input-group-addon"><i class="material-icons">attach_money</i></span>
<div class="form-line">
<input asp-for="Lar.RendaMensal" class="form-control date" />
<span asp-validation-for="Lar.RendaMensal" class="text-danger"></span>
</div>
<span class="input-group-addon">,00</span>
</div>
</div>
<div class="form-group">
<input type="submit" value="Finalizar Cadastro" class="btn btn-primary btn-lg" />
</div>
</div>
<div class="col-md-1">
<!-- Gap between columns -->
</div>
<div class="col-md-4">
<div class="form-group">
<label asp-for="Lar.PessoasNaCasa" class="control-label"></label>
<div class="input-group">
<span class="input-group-addon"><i class="material-icons">home</i></span>
<div class="form-line">
<input asp-for="Lar.PessoasNaCasa" class="form-control" />
<span asp-validation-for="Lar.PessoasNaCasa" class="text-danger"></span>
</div>
</div>
</div>
<div class="form-group">
<label asp-for="Lar.MetragemCasa" class="control-label"></label>
<div class="input-group">
<span class="input-group-addon"><i class="material-icons">home</i></span>
<div class="form-line">
<input asp-for="Lar.MetragemCasa" class="form-control" />
<span asp-validation-for="Lar.MetragemCasa" class="text-danger"></span>
</div>
</div>
</div>
<div class="form-group">
<label asp-for="Lar.TipoLar" class="control-label"></label>
<div class="input-group">
<span class="input-group-addon"><i class="material-icons">home</i></span>
<div class="form-line">
<select asp-for="Lar.TipoLar" asp-items="Html.GetEnumSelectList<TipoLar>()">
<option value="" selected disabled hidden>Selecione</option>
</select>
<span asp-validation-for="Lar.TipoLar" class="text-danger"></span>
</div>
</div>
</div>
<div class="form-group">
<label asp-for="Lar.CasaComTela" class="control-label"></label>
<div class="input-group">
<span class="input-group-addon"><i class="material-icons">home</i></span>
<div class="form-line">
<select asp-for="Lar.CasaComTela" asp-items="Html.GetEnumSelectList<CasaComTela>()">
<option value="" selected disabled hidden>Selecione</option>
</select>
<span asp-validation-for="Lar.CasaComTela" class="text-danger"></span>
</div>
</div>
</div>
<div class="form-group">
<label asp-for="Lar.TemCriancas" class="control-label"></label>
<div class="input-group">
<span class="input-group-addon"><i class="material-icons">home</i></span>
<div class="form-line">
<select asp-for="Lar.TemCriancas" asp-items="Html.GetEnumSelectList<TemCriancas>()">
<option value="" selected disabled hidden>Selecione</option>
</select>
<span asp-validation-for="Lar.TemCriancas" class="text-danger"></span>
</div>
</div>
</div>
<div class="form-group">
<label asp-for="Lar.TemAnimais" class="control-label"></label>
<div class="input-group">
<span class="input-group-addon"><i class="material-icons">home</i></span>
<div class="form-line">
<select asp-for="Lar.TemAnimais" asp-items="Html.GetEnumSelectList<TemAnimais>()">
<option value="" selected disabled hidden>Selecione</option>
</select>
<span asp-validation-for="Lar.TemAnimais" class="text-danger"></span>
</div>
</div>
</div>
</div>
</form>
</div>
在action方法中使用[FromBody]属性作为传入请求模型参数可能会有所帮助。像这样的东西：
[HttpPost]
public void Post([FromBody] Adotante incomingRequest)
{
\\posting logic here
}