ASP.NETCoreMVC-從表單資料到視圖模型的資料系結-有解無憂

我正在開發一個基于 .NET 6 框架的 ASP.NET Core MVC 應用程式。我想從我的表單中檢索一個與我的視圖模型的類成員的屬性相匹配的值。

我所有特定資料庫物體的抽象模型：

public abstract class MyAbstractDatabaseEntity
{
    [Column(TypeName = "bit"), Required, MaxLength(1), Unicode(false)]
    public bool SafeDelete { get; set; } = false;

    [Column(TypeName = "datetime")]
    public DateTime CreationDate { get; set; }

    [Required, MaxLength(12), Unicode(false)]
    public string CreationUserID { get; set; }

    [Column(TypeName = "datetime")]
    public DateTime UpdateDate { get; set; }

    [Required, MaxLength(12), Unicode(false)]
    public string UpdateUserID { get; set; }
}

我的特定資料庫物體之一：

[Table("MyDatabaseTable")]
public class MyEntity : MyAbstractDatabaseEntity
{
    [Key]
    [Required]
    public int ID { get; set; }

    [Display(Name = "Account number"), Required, Unicode(false)]
    [RegularExpression(@"^(\d )$")]
    [MaxLength(11)]
    public string AccountNumber { get; set; }

    [Column(TypeName = "bit")]
    [MaxLength(1)]
    [Required]
    public bool IsDraft { get; set; } = false;
}

我的視圖模型

public class MyViewModel
{
    public MyEntity Entity { get; set; } = new();

    public string Title { get; set; }
}

我的控制器

public class MyHomeController : Controller
{
    // GET: MyHome/Index
    public IActionResult Index()
    {
        MyViewModel model = new()
        {
            Title = "My page - Search account details"
        };
        return View(model);
    }

    // POST: MyHome/FindAccountDetails
    [HttpPost, ValidateAntiForgeryToken]
    public ActionResult FindBankAccountDetails(MyViewModel model)
    {
        if (!ModelState.IsValid)
        {
            return View(model);
        }
        return PartialView("_Details", model);
    }
}

我的觀點：

@using MyApplication
@model MyViewModel

<div class="container">
    <div class="container-header">
        <h2>@Model.Title</h2>
    </div>
    <div class="container-body">
        @using (Html.AjaxBeginForm("FindBankAccountDetails", "MyHome", new AjaxOptions
         {
             HttpMethod = "POST",
             UpdateTargetId = "request-general-information",
             InsertionMode = InsertionMode.Replace
         }))
        {
            <div class="form-group">
                <label asp-for="Entity.AccountNumber" class="control-label">Account number</label>
                <input asp-for="Entity.AccountNumber" class="form-control" />
                <span asp-validation-for="Entity.AccountNumber" class="text-danger"></span>
            </div>

            <button type="submit" class="btn btn-primary">Search details</button>
        }
    </div>
</div>

<div class="piw-filter" id="request-general-information"></div>

@section Scripts {
    @{
        await Html.RenderPartialAsync("_ValidationScriptsPartial");
    }
}

我的問題：在驗證時，程式無法識別視圖模型。該程式在控制臺中回傳以下訊息：

Microsoft.AspNetCore.Hosting.Diagnostics: Information: Request starting HTTP/1.1 POST https://localhost:44323/MyHome/FindBankAccountDetails application/x-www-form-urlencoded; charset=UTF-8 283
Microsoft.AspNetCore.Routing.EndpointMiddleware: Information: Executing endpoint 'MyApplication.MyHomeController.FindBankAccountDetails (‘MyApplication)'
Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker: Information: Route matched with {action = "FindBankAccountDetails", controller = "MyHome"}. Executing controller action with signature Microsoft.AspNetCore.Mvc.ActionResult FindBankAccountDetails(MyApplication.MyViewModel) on controller MyApplication.MyHomeController (‘MyApplication).
Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker: Information: Executed action MyApplication.MyHomeController.FindBankAccountDetails (‘MyApplication) in 3.8675ms
Microsoft.AspNetCore.Routing.EndpointMiddleware: Information: Executed endpoint 'MyApplication.MyHomeController.FindBankAccountDetails (‘MyApplication)'
Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware: Error: An unhandled exception has occurred while executing the request.

System.InvalidCastException: The field of type System.Boolean must be a string, array or ICollection type.
   at System.ComponentModel.DataAnnotations.MaxLengthAttribute.IsValid(Object value)
   at System.ComponentModel.DataAnnotations.ValidationAttribute.IsValid(Object value, ValidationContext validationContext)
   at System.ComponentModel.DataAnnotations.ValidationAttribute.GetValidationResult(Object value, ValidationContext validationContext)
   at Microsoft.AspNetCore.Mvc.DataAnnotations.DataAnnotationsModelValidator.Validate(ModelValidationContext validationContext)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.ValidateNode()
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitSimpleType()
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitImplementation(ModelMetadata& metadata, String& key, Object model)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.Visit(ModelMetadata metadata, String key, Object model)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitChildren(IValidationStrategy strategy)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitComplexType(IValidationStrategy defaultStrategy)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitImplementation(ModelMetadata& metadata, String& key, Object model)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.Visit(ModelMetadata metadata, String key, Object model)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitChildren(IValidationStrategy strategy)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitComplexType(IValidationStrategy defaultStrategy)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitImplementation(ModelMetadata& metadata, String& key, Object model)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.Visit(ModelMetadata metadata, String key, Object model)
   at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.Validate(ModelMetadata metadata, String key, Object model, Boolean alwaysValidateAtTopLevel, Object container)
   at Microsoft.AspNetCore.Mvc.ModelBinding.ObjectModelValidator.Validate(ActionContext actionContext, ValidationStateDictionary validationState, String prefix, Object model, ModelMetadata metadata, Object container)
   at Microsoft.AspNetCore.Mvc.ModelBinding.ParameterBinder.EnforceBindRequiredAndValidate(ObjectModelValidator baseObjectValidator, ActionContext actionContext, ParameterDescriptor parameter, ModelMetadata metadata, ModelBindingContext modelBindingContext, ModelBindingResult modelBindingResult, Object container)
   at Microsoft.AspNetCore.Mvc.ModelBinding.ParameterBinder.BindModelAsync(ActionContext actionContext, IModelBinder modelBinder, IValueProvider valueProvider, ParameterDescriptor parameter, ModelMetadata metadata, Object value, Object container)
   at Microsoft.AspNetCore.Mvc.Controllers.ControllerBinderDelegateProvider.<>c__DisplayClass0_0.<<CreateBinderDelegate>g__Bind|0>d.MoveNext()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeInnerFilterAsync>g__Awaited|13_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.StatusCodePagesMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.StatusCodePagesMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.<Invoke>g__Awaited|6_0(ExceptionHandlerMiddleware middleware, HttpContext context, Task task)
Microsoft.AspNetCore.Routing.EndpointMiddleware: Information: Executing endpoint '405 HTTP Method Not Supported'
Microsoft.AspNetCore.Routing.EndpointMiddleware: Information: Executed endpoint '405 HTTP Method Not Supported'
Microsoft.AspNetCore.Hosting.Diagnostics: Information: Request finished HTTP/1.1 POST https://localhost:44323/MyHome/FindBankAccountDetails application/x-www-form-urlencoded; charset=UTF-8 283 - 405 - text/plain 34.4795ms

然后瀏覽器顯示此訊息：https://localhost:44323/MyHome/FindBankAccountDetails 405 (Method Not Allowed)

我無法FindBankAccountDetails通過使用斷點來達到控制器方法。

為什么不MyViewModel從FindBankAccountDetails控制器方法中檢索視圖模型？

謝謝你的幫助。

uj5u.com熱心網友回復：

根據檔案屬性 [MaxLength()] 指定陣列或字串的最大長度。IsDraft 是布林值，這就是您得到 InvalidCastException 的原因。

[Column(TypeName = "bit")]
[MaxLength(1)]
[Required]
public bool IsDraft { get; set; } = false;

轉載請註明出處，本文鏈接：https://www.uj5u.com/ruanti/490297.html

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