在 .NET Core MVC 6 中发布表单时，模型绑定强制在非必填字段中具有值

Question

我正在 post 从 MVC 视图获取值。下面是 .cshtml 代码

 <form asp-action="Create">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <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="ContractStartDate" class="control-label"></label>
                <input asp-for="ContractStartDate" class="form-control" />
                <span asp-validation-for="ContractStartDate" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="ContractEndDate" class="control-label"></label>
                <input asp-for="ContractEndDate" class="form-control" />
                <span asp-validation-for="ContractEndDate" class="text-danger"></span>
            </div>
            <div class="form-group form-check">
                <label class="form-check-label">
                    <input class="form-check-input" asp-for="IsActive" /> @Html.DisplayNameFor(model => model.IsActive)
                </label>
            </div>
            <div class="form-group">
                <label asp-for="Website" class="control-label"></label>
                <input asp-for="Website" class="form-control" />
                <span asp-validation-for="Website" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="LogoUrl" class="control-label"></label>
                <input asp-for="LogoUrl" class="form-control" />
                <span asp-validation-for="LogoUrl" class="text-danger"></span>
            </div>
            <div class="form-group">
                <input type="submit" value="Create" class="btn btn-primary" />
            </div>
        </form>

这是我的模型代码

public class Client : BaseEntity
    {
        [Key]
        public int Id { get; set; }

        [Required(ErrorMessage ="Client Name is Required")]
        [Display(Name ="Client Name")]
        public string Name { get; set; }

        [Required(ErrorMessage = "Contract StartDate is Required")]
        [DataType(DataType.Date, ErrorMessage = "Invalid Date Format")]
        [Display(Name = "Contract StartDate")]
        public DateTime ContractStartDate { get; set; }

        [Required(ErrorMessage = "Contract EndDate is Required")]
        [DataType(DataType.Date, ErrorMessage = "Invalid Date Format")]
        [Display(Name = "Contract End Date")]
        public DateTime ContractEndDate { get; set; }

        [Required]
        [Display(Name = "Is Active")]
        public bool IsActive { get; set; }

        [Required]
        public string Website { get; set; }

        public string LogoUrl { get; set; }
    }

BaseEntity.cs代码

public abstract class BaseEntity
    {
        public string CreatedBy { get; set; }
        public DateTime CreatedDate { get; set; }
        public string CreatedIPAddress { get; set; }

        public string ModifiedBy { get; set; }
        public DateTime ModifiedDate { get; set; }
        public string ModifiedIPAddress { get; set; }
    }

这是 MVC 控制器中的 Post 函数..

[HttpPost]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> Create([Bind("Id,Name,ContractStartDate,ContractEndDate,IsActive,Website,LogoUrl")] Client client)
        {
            if (ModelState.IsValid)
            {
                _context.Add(client);
                await _context.SaveChangesAsync();
                return RedirectToAction(nameof(Index));
            }
            return View(client);
        }

当我在提供所需值后单击提交按钮时...即使对于 BaseEntity.cs class.

的非必需字段，它也会显示验证错误

当我填写所有这些非必填字段并从控制器的 post Bind[] 方法中删除时...显示模型无效。

控制器模型验证

查看详细错误...

请帮忙....如何绕过这个错误。

Answer 1

由于您使用的是 net 6，因此您有 2 个选择

在 EF 核心项目中删除或注释这一行

 <!--<Nullable>enable</Nullable>-->

或手动使每个 class 中的每个属性可为空

       public string? CreatedBy { get; set; }
        public DateTime? CreatedDate { get; set; }
        public string? CreatedIPAddress { get; set; }
      // ---and so on for all classes

在 .NET Core MVC 6 中发布表单时，模型绑定强制在非必填字段中具有值

Model Binding is forcing to have value in non-required field while posting the form in .NET Core MVC 6

c#

asp.net-mvc

entity-framework-core

asp.net-core-6.0