[英]asp.net core 3.1 streaming large file upload - can't prevent model binding
[英]ASP.Net Core 3.1 - File Upload With View Model gets always NULL
我正在嘗試使用視圖模型將文件上傳到服務器。
我的模型是這樣的:
using Microsoft.AspNetCore.Identity;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Runtime.Serialization;
namespace XmlSigner.Data.Models
{
public class XmlFile : BaseModel
{
[IgnoreDataMember]
[ConcurrencyCheck] //2 file should not be same
[Column("FileContent", TypeName = "text"), Required(ErrorMessage = "File Content should be given"), MinLength(5), Display(Name = "File Content", Prompt = "Please Give File Content")]
public string FileLocationInServer { get; set; }
[Column("PreviousFileId"), Display(Name = "Previous Signed/Unsigned File", Prompt = "Please select Previous File")]
public long? PreviousFileId { get; set; }
[ForeignKey("PreviousFileId"), Display(Name = "Previous Signed/Unsigned File", Prompt = "Please Select Previous File")]
public virtual XmlFile PreviousSignedFile { get; set; }
}
}
我的視圖模型是這樣的:
using Microsoft.AspNetCore.Http;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using XmlSigner.Data.Models;
namespace XmlSigner.ViewModels
{
public class XmlFileAddViewModel
{
[Required(ErrorMessage = "File Content should be given"), MinLength(5), Display(Name = "File Content", Prompt = "Please Give File Content")]
public FormFile XmlFile { get; set; }
[Display(Name = "Previous Signed/Unsigned File", Prompt = "Please select Previous File")]
public long? PreviousFileId { get; set; }
[ForeignKey("PreviousFileId"), Display(Name = "Previous Signed/Unsigned File", Prompt = "Please Select Previous File")]
public virtual XmlFile PreviousSignedFile { get; set; }
}
}
而View Form是這樣的:
<form asp-action="Create" enctype="multipart/form-data">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<div class="form-group">
<label asp-for="XmlFile" class="control-label"></label>
<input class="form-control" asp-for="XmlFile">
<span asp-validation-for="XmlFile" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="PreviousFileId" class="control-label"></label>
<select asp-for="PreviousFileId" class="form-control" asp-items="ViewBag.PreviousFileId"></select>
</div>
<div class="form-group">
<input type="submit" value="Create" class="btn btn-primary" />
</div>
</form>
而控制器是這樣的:
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create(XmlFileAddViewModel xmlFileAddViewModel)
{
.........................
.........................
}
我發現的是:
所以,我得到的是上傳的文件為空。
誰能幫我找出為什么我上傳的文件為空?
如果我使用IFormFile那么我會收到這個錯誤 -
System.InvalidCastException: The field of type Microsoft.AspNetCore.Http.FormFile must be a string, array or ICollection type.
at System.ComponentModel.DataAnnotations.MinLengthAttribute.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.VisitComplexType(IValidationStrategy defaultStrategy)
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.Visit(ModelMetadata metadata, String key, Object model)
at Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.Validate(ModelMetadata metadata, String key, Object model, Boolean alwaysValidateAtTopLevel)
at Microsoft.AspNetCore.Mvc.ModelBinding.ObjectModelValidator.Validate(ActionContext actionContext, ValidationStateDictionary validationState, String prefix, Object model, ModelMetadata metadata)
at Microsoft.AspNetCore.Mvc.ModelBinding.ParameterBinder.EnforceBindRequiredAndValidate(ObjectModelValidator baseObjectValidator, ActionContext actionContext, ParameterDescriptor parameter, ModelMetadata metadata, ModelBindingContext modelBindingContext, ModelBindingResult modelBindingResult)
at Microsoft.AspNetCore.Mvc.ModelBinding.ParameterBinder.BindModelAsync(ActionContext actionContext, IModelBinder modelBinder, IValueProvider valueProvider, ParameterDescriptor parameter, ModelMetadata metadata, Object value)
at Microsoft.AspNetCore.Mvc.Controllers.ControllerBinderDelegateProvider.<>c__DisplayClass0_0.<<CreateBinderDelegate>g__Bind|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
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|24_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 where exception was thrown ---
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore.MigrationsEndPointMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore.DatabaseErrorPageMiddleware.Invoke(HttpContext httpContext)
at Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore.DatabaseErrorPageMiddleware.Invoke(HttpContext httpContext)
at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
正如@CodeCaster 所說, MinLengthAttribute
用於指定屬性中允許的數組或字符串數據的最小長度。因此您不能為IFormFile
聲明。
更改如下:
public class XmlFileAddViewModel
{
[Required(ErrorMessage = "File Content should be given"),Display(Name = "File Content", Prompt = "Please Give File Content")]
public IFormFile XmlFile { get; set; }
[Display(Name = "Previous Signed/Unsigned File", Prompt = "Please select Previous File")]
public long? PreviousFileId { get; set; }
}
嘗試使用IFormFile
而不是FormFile
如下:
public class XmlFileAddViewModel
{
[Required(ErrorMessage = "File Content should be given"), MinLength(5), Display(Name = "File Content", Prompt = "Please Give File Content")]
public IFormFile XmlFile { get; set; }
[Display(Name = "Previous Signed/Unsigned File", Prompt = "Please select Previous File")]
public long? PreviousFileId { get; set; }
[Display(Name = "Previous Signed/Unsigned File", Prompt = "Please Select Previous File")]
public IFormFile PreviousSignedFile { get; set; }
}
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