Input string was not in a correct format.當我想發布表單時出現錯誤。它甚至沒有達到目標動作
但是我之前沒有這個問題
錯誤：
FormatException: Input string was not in a correct format.
System.Text.ValueStringBuilder.ThrowFormatError()
System.Text.ValueStringBuilder.AppendFormatHelper(IFormatProvider provider, string format, ParamsArray args)
string.FormatHelper(IFormatProvider provider, string format, ParamsArray args)
string.Format(IFormatProvider provider, string format, object arg0)
System.ComponentModel.DataAnnotations.ValidationAttribute.FormatErrorMessage(string name)
System.ComponentModel.DataAnnotations.ValidationAttribute.IsValid(object value, ValidationContext validationContext)
System.ComponentModel.DataAnnotations.ValidationAttribute.GetValidationResult(object value, ValidationContext validationContext)
Microsoft.AspNetCore.Mvc.DataAnnotations.DataAnnotationsModelValidator.Validate(ModelValidationContext validationContext)
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.ValidateNode()
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitSimpleType()
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitImplementation(ref ModelMetadata metadata, ref string key, object model)
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.Visit(ModelMetadata metadata, string key, object model)
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitChildren(IValidationStrategy strategy)
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitComplexType(IValidationStrategy defaultStrategy)
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitImplementation(ref ModelMetadata metadata, ref string key, object model)
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.Visit(ModelMetadata metadata, string key, object model)
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.Validate(ModelMetadata metadata, string key, object model, bool alwaysValidateAtTopLevel, object container)
Microsoft.AspNetCore.Mvc.ModelBinding.ObjectModelValidator.Validate(ActionContext actionContext, ValidationStateDictionary validationState, string prefix, object model, ModelMetadata metadata, object container)
Microsoft.AspNetCore.Mvc.ModelBinding.ParameterBinder.EnforceBindRequiredAndValidate(ObjectModelValidator baseObjectValidator, ActionContext actionContext, ParameterDescriptor parameter, ModelMetadata metadata, ModelBindingContext modelBindingContext, ModelBindingResult modelBindingResult, object container)
Microsoft.AspNetCore.Mvc.ModelBinding.ParameterBinder.BindModelAsync(ActionContext actionContext, IModelBinder modelBinder, IValueProvider valueProvider, ParameterDescriptor parameter, ModelMetadata metadata, object value, object container)
System.Threading.Tasks.ValueTask<TResult>.get_Result()
System.Runtime.CompilerServices.ValueTaskAwaiter<TResult>.GetResult()
Microsoft.AspNetCore.Mvc.Controllers.ControllerBinderDelegateProvider <>c__DisplayClass0_0 <<CreateBinderDelegate>g__Bind|0>d.MoveNext()
Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeInnerFilterAsync>g__Awaited|13_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, object state, bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, object state, bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
形式：
@model Project.Models.Product
@{
ViewData["Title"] = "Create";
Layout = "~/Views/Shared/_AdminLayout.cshtml";
}
<h1>Add Product</h1>
<hr />
<div class="row">
<form id="CreateForm" asp-action="Create" enctype="multipart/form-data">
<div class="col-md-8">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<div class="form-group">
<label asp-for="Price" class="control-label"></label>
<input type="number" name="Price" class="form-control" />
<span asp-validation-for="Price" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Name" class="control-label"></label>
<input type="text" name="Name" class="form-control" />
<span asp-validation-for="Name" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="ShortDescription" class="control-label"></label>
<textarea name="ShortDescription" class="form-control" id="ShortDescription"></textarea>
<span asp-validation-for="ShortDescription" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Description" class="control-label"></label>
<textarea name="Description" class="form-control" id="Description"></textarea>
<span asp-validation-for="Description" class="text-danger"></span>
</div>
<div class="form-group">
<input type="submit" value="Create" class="btn btn-primary" />
</div>
</div>
<div class="col-md-4">
<div class="panel panel-primary">
<div class="panel-heading">picture</div>
<div class="panel-body">
<img id="productimage" class="thumbnail" src="/images/Products/Original/nophoto.jpg" />
<div class="form-group">
<input type="file" name="img" id="uploadimage" onchange="loadFile(event)" />
<span asp-validation-for="ImageName" class="text-danger"></span>
</div>
</div>
</div>
<div class="file-upload-wrapper">
<input name="file" id="File" onchange='getFileName()' type="file" class="file-upload-field" value="">
</div>
<label id="FileName"></label>
</div>
</form>
</div>
@section Scripts {
@{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
<script src="https://cdn.ckeditor.com/4.16.2/standard/ckeditor.js"></script>
<script>
function readURL(input) {
if (input.files && input.files[0]) {
var reader = new FileReader();
reader.onload = function (e) {
$('#productimage').attr('src', e.target.result);
}
reader.readAsDataURL(input.files[0]);
}
}
$("#uploadimage").change(function () {
readURL(this);
});
CKEDITOR.replace('Description');
CKEDITOR.replace('ShortDescription');
function getFileName() {
let file = document.getElementById('File');
let lbl = document.getElementById('FileName');
lbl.innerHTML = file.value.replace(/.*(\/|\\)/, '');
}
</script>
}
模型：
public class Product
{
[Key]
public int ProductId { get; set; }
[Display(Name ="????")]
[Required(ErrorMessage ="???? {?} ?? ???? ????")]
public uint Price { get; set; }
[Display(Name = "??? ?????")]
[Required(ErrorMessage = "???? {?} ?? ???? ????")]
[MaxLength(50)]
public string Name { get; set; }
[Display(Name = "????? ?????")]
[Required(ErrorMessage = "???? {?} ?? ???? ????")]
[MaxLength(1500)]
public string ShortDescription { get; set; }
[Display(Name = "????? ????")]
[Required(ErrorMessage = "???? {?} ?? ???? ????")]
public string Description { get; set; }
[MaxLength(42)]
public string ImageName { get; set; }
[Display(Name = "????")]
[Required(ErrorMessage = "???? {?} ?? ???? ????")]
[MaxLength(42)]
public string File { get; set; }
public DateTime Date { get; set; }
}
行動：
[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create([Bind("ProductId,Price,Name,ShortDescription,Description,ImageName,File")] Product product, IFormFile img,IFormFile file)
{
if (ModelState.IsValid)
{
if (file==null)
{
ViewBag.Error = "???? ???? ?? ????? ????";
return View(product);
}
product.Date = DateTime.Now;
product.ImageName = "nophoto.jpg";
if (img != null && img.IsImage())
{
product.ImageName = Guid.NewGuid().ToString() Path.GetExtension(img.FileName);
string savePath = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot/images/Products/Original", product.ImageName);
using (var stream = new FileStream(savePath, FileMode.Create))
{
img.CopyTo(stream);
}
ImageConvertor imgResizer = new ImageConvertor();
string thumbPath = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot/images/Products/Thumb", product.ImageName);
imgResizer.Image_resize(savePath, thumbPath, 150);
}
_context.Add(product);
await _context.SaveChangesAsync();
return RedirectToAction(nameof(Index));
}
return View(product);
}
uj5u.com熱心網友回復：
ValidationAttribute.FormatErrorMessage()正在拋出Input string was not in a correct format錯誤。
這是因為您的模型中的錯誤訊息。例如[Required(ErrorMessage = "???? {?} ?? ???? ????")]
錯誤是因為{}. 它在 C# 中具有特殊的含義。所以你必須為此使用轉義字符。
例子： (ErrorMessage = "Your characters should be in: !#$%&()* ,-./:;<=>?@[]^_{{|}}~"
所以為了逃避{，你必須使用 double {。
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