ASP.NET Core 将图像存储到 SQL Server null

Question

我是 ASP.NET Core 3.1 的初学者，我正在使用 Microsoft 网站上的 EF Core 教程创建此应用程序，当我尝试创建新作业并存储照片时，照片属性在数据库上显示为空，我没有知道为什么？ 我使用调试器查看图像是否进入控制器中的 Create 方法，并且 IFormFile Image 参数说它为空。

型号：

        public int JobID { get; set; }

        [Required]
        [Column("Title")]
        [StringLength(150, MinimumLength = 3)]
        [Display(Name = "Title")]
        public string Title { get; set; }

        [Display(Name = "Photo")]
        public byte[] Photo { get; set; }

        [Required]
        [DataType(DataType.Date)]
        [DisplayFormat(DataFormatString = "{0:dd-MM-yyyy}", ApplyFormatInEditMode = true)]
        [Display(Name = "Date")]
        public DateTime Date { get; set; }

        [Required]
        [Column("CategoryID")]
        [Display(Name = "CategoryID")]
        public int CategoryID { get; set; }
        
        [Required]
        [Column("CompanyID")]
        [Display(Name = "CompanyID")]
        public int CompanyID { get; set; }

        public Category Category { get; set; }
        public Company Company { get; set; }
        public ICollection<Application> Applications { get; set; }

查看 - Create.html：

<form asp-action="Create" method="post" enctype="multipart/form-data">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <div class="form-group">
                <label asp-for="Title" class="control-label"></label>
                <input asp-for="Title" class="form-control" />
                <span asp-validation-for="Title" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="Photo" class="control-label"></label>
                <input type="file" name="Photo" class="form-control" />
                @*<span asp-validation-for="Photo" class="text-danger"></span>*@
            </div>
            <div class="form-group">
                <label asp-for="Date" class="control-label"></label>
                <input asp-for="Date" class="form-control" />
                <span asp-validation-for="Date" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="CategoryID" class="control-label"></label>
                <select asp-for="CategoryID" class ="form-control" asp-items="ViewBag.CategoryID"></select>
            </div>
            <div class="form-group">
                <label asp-for="CompanyID" class="control-label"></label>
                <select asp-for="CompanyID" class ="form-control" asp-items="ViewBag.CompanyID"></select>
            </div>
            <div class="form-group">
                <input type="submit" value="Create" class="btn btn-primary" />
            </div>
        </form>

控制器方法 JobsController:

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Create([Bind("JobID,Title,Photo,Date,CategoryID,CompanyID")] Job job, IFormFile Image)
{
    if (ModelState.IsValid)
    {
        if (Image != null) {
            if (Image.Length > 0) {
                byte[] p1 = null;
                using (var fs1 = Image.OpenReadStream())
                using (var ms1 = new MemoryStream())
                {
                    fs1.CopyTo(ms1);
                    p1 = ms1.ToArray();
                }
                job.Photo = p1;
            }
        }
        _context.Add(job);
        await _context.SaveChangesAsync();
        return RedirectToAction(nameof(Index));
    }
    ViewData["CategoryID"] = new SelectList(_context.Categories, "CategoryID", "CategoryID", job.CategoryID);
    ViewData["CompanyID"] = new SelectList(_context.Companies, "CompanyID", "Name", job.CompanyID);
    return View(job);
}

这里是 null：IFormFile Image null, Job Photo 属性也为 null

public async Task<IActionResult> Create([Bind("JobID,Title,Photo,Date,CategoryID,CompanyID")] Job job, IFormFile Image)

其他属性存储良好，我尝试了几乎所有类似的解决方案，但没有一个对我有帮助。有什么想法吗？

Answer 1

你可以试试这个：

     var file = HttpContext.Request.Form.Files["Photo"];
     if (file!=null && file.Length > 0)
       {
           using (var ms = new MemoryStream())
           {
                file.CopyTo(ms);
                var fileBytes = ms.ToArray();
                // store your bytes in db ...    
           }
       }