在我的 ASP.NET Core MVC 应用程序中遇到模型绑定和处理对象的问题

Question

我在 ASP.NET Core MVC 应用程序中遇到模型绑定问题。目前，MVC 模板是默认模板。当我编写 HTTP POST 方法时，用户提交反馈后，它不会存储在反馈对象中：

public async Task<IActionResult> Feedback(FeedbackModel feedback)

HomeController

public IActionResult Feedback()
{
    return View("Feedback"); 
}

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Feedback(FeedbackModel feedback)
{
    if (!ModelState.IsValid)
    {
        // Log or inspect model state errors
        foreach (var error in ModelState.Values.SelectMany(v => v.Errors))
        {
            _logger.LogError($"Error: {error.ErrorMessage}");
        }

        return View(feedback); 
    }

    var jsonFeedback = JsonConvert.SerializeObject(feedback);

    var deserializedFeedback = JsonConvert.DeserializeObject<object>(jsonFeedback, new JsonSerializerSettings()
    {
        TypeNameHandling = TypeNameHandling.All 
    });

    string filePath = "feedback.txt";
    await System.IO.File.WriteAllTextAsync(filePath, jsonFeedback);

    return RedirectToAction("Index"); 
}

View

 @model FeedbackModel

@{
    ViewData["Title"] = "Feedback";
}

<h2>@ViewData["Title"]</h2>

@if (TempData["Message"] != null)
{
    <div class="alert alert-success">
        @TempData["Message"]
    </div>
}

<form method="post" >
    <div class="form-group">
        <label asp-for="Name" class="control-label"></label>
        <input asp-for="Name" class="form-control" />
        <span asp-validation-for="Name" class="text-danger"></span>
    </div>

    <div class="form-group">
        <label asp-for="Email" class="control-label"></label>
        <input asp-for="Email" class="form-control" />
        <span asp-validation-for="Email" class="text-danger"></span>
    </div>

    <div class="form-group">
        <label asp-for="Feedback" class="control-label"></label>
        <textarea asp-for="Feedback" class="form-control"></textarea>
        <span asp-validation-for="Feedback" class="text-danger"></span>
    </div>

    <button type="submit" asp-controller="Home" class="btn btn-primary">Submit</button>
</form>

@section Scripts {
    <partial name="_ValidationScriptsPartial" />
}

Model

using System.ComponentModel.DataAnnotations;

namespace SecureStoreApp.Models
{
    public class FeedbackModel
    {
        [Required(ErrorMessage = "Name is required")]
        public string Name { get; set; }

        [Required(ErrorMessage = "Email is required")]
        [EmailAddress(ErrorMessage = "Invalid email address")]
        public string Email { get; set; }

        [Required(ErrorMessage = "Feedback is required")]
        public string Feedback { get; set; }
    }
}

Answer 1

你的模型

FeedbackModel

有属性

FeedBack

，并且你设置的绑定参数名称是

feedback

，导致冲突

“FeedbackModel”类型的属性与参数“feedback”同名。这可能会导致模型绑定不正确。考虑重命名参数或属性以避免冲突。如果类型“FeedbackModel”具有自定义类型转换器或自定义模型绑定器，您可以抑制此消息。

您应该重命名以避免冲突，我建议将

feedback

重命名为

model

，它应该可以工作。

         [ValidateAntiForgeryToken]
         // Rename feedback to model
         public async Task<IActionResult> Feedback(FeedbackModel model)
         {
             if (!ModelState.IsValid)