public class EmployeeModel{
    [ScaffoldColumn(false)]
    public int EmployeeID { get; set; }
    [Required(ErrorMessage = "Please Enter Position ID")]
    public int PositionID { get; set; }
    [Required(ErrorMessage = "Please Enter NO PEK")]
    public string NoPEK { get; set; }
    [Required(ErrorMessage = "Please Enter NO KTP")]
    public string NoKTP { get; set; }
    [Required(ErrorMessage = "Please Enter TaxID")]
    public string TaxID { get; set; }
    [Required(ErrorMessage = "Please Enter FirstName")]
    public string FirstName { get; set; }
    [Required(ErrorMessage = "Please Enter LastName")]
    public string LastName { get; set; }
    [Required(ErrorMessage = "Please Enter OrganizationID")]
    public int OrganizationID { get; set; }
    [Required(ErrorMessage = "Please Enter BirthPlace")]
    public string BirthPlace { get; set; }
    [Required(ErrorMessage = "Please Enter BirthDay")]
    public System.DateTime BirthDay { get; set; }
    [Required(ErrorMessage = "Please Enter Gender")]
    public string Gender { get; set; }
    [Required(ErrorMessage = "Please Enter Religion")]
    public string Religion { get; set; }
    [Required(ErrorMessage = "Please Enter TaxAddress")]
    public string TaxAddress { get; set; }
    [Required(ErrorMessage = "Please Enter Home Address")]
    public string HomeAddress { get; set; }
    [Required(ErrorMessage = "Please Enter Current Address")]
    public string CurrentAddress { get; set; }
    [Required(ErrorMessage = "Please Enter Phone Number")]
    public string PhoneNumber { get; set; }
    [Required(ErrorMessage = "Please Enter Email")]
    public string Email { get; set; }
    [Required(ErrorMessage = "Please Enter IsAuditor")]
    public string IsAuditor { get; set; }
    [Required(ErrorMessage = "Please Enter TaxProvince ")]
    public int TaxProvinceID { get; set; }
    [Required(ErrorMessage = "Please Enter Tax City ")]
    public int TaxCityID { get; set; }
    [Required(ErrorMessage = "Please Enter Home Province ")]
    public int HomeProvinceID { get; set; }
    [Required(ErrorMessage = "Please Enter Home City")]
    public int HomeCityID { get; set; }
    [Required(ErrorMessage = "Please Enter Current Province")]
    public int CurrentProvinceID { get; set; }
    [Required(ErrorMessage = "Please Enter Current City")]
    public int CurrentCityID { get; set; }
    [Required(ErrorMessage = "Please Enter Avatar Url")]
    public string AvatarUrl { get; set; }
}

    [HttpPost]
    public ActionResult Create(EventModel eventmodel, HttpPostedFileBase file)
    {
        if (ModelState.IsValid)
        {
            var filename = Path.GetFileName(file.FileName);
            var path = Path.Combine(Server.MapPath("~/Uploads/Photo/"), filename);
            file.SaveAs(path);
            tyre.Url = filename;
            _db.EventModels.AddObject(eventmodel);
            _db.SaveChanges();
            return RedirectToAction("Index");
        }
        return View(eventmodel);
    }

上传文件，存储在本地文件系统中，然后保存到数据库是一种常见的模式。这些是我的建议。

1。不要使用上传的文件名作为文件名

这很常见:

var filename = Path.GetFileName(file.FileName);
var path = Path.Combine(Server.MapPath("~/Uploads/Photo/"), filename);
file.SaveAs(path);

别这么做。原因如下:

a)文件名可能冲突。b)远程文件名可能与本地文件系统不兼容。c)有人可能会尝试恶意文件名，这样做可能会破坏您的服务器。

相反，生成您自己的文件名(可能使用GUID, GUID.NewGuid().ToString())并将原始文件名存储在数据库中。

2。不要将所有文件存储在一个文件夹

在某些时候，你的文件夹会包含太多的文件，操作系统无法快速处理。

按一些有用的东西对文件进行分区，比如用户ID。这也有助于隔离用户之间的文件。

3。不要在数据库

中存储文件的完整路径

在某些时候，您可能会移动文件(可能到另一个驱动器)，并且所有存储的文件位置将被破坏。

4。不要在数据库中存储图像URL

与#3相同。如果你的web应用改变了，你想要改变图像url，那么你在数据库中存储了不正确的url。你必须扫描和更新你所有的数据库记录。

5。不要在数据库中存储冗余的路径信息

虽然在数据库中存储的URL中包含"Uploads/Photo/"可能很诱人，但它也有许多问题:

a)这是冗余数据。对于每个文件，您都在使用额外的、不必要的数据空间。b)如果你的应用改变了，URL也应该改变，你存储的URL就会被破坏。

相反，在从数据库读取值后，在URL前加上"Uploads/Photo/"。

更新:

下面是一些示例代码:

    [HttpPost]
    public ActionResult Create(EventModel eventmodel, HttpPostedFileBase file)
    {
        if (ModelState.IsValid)
        {
            var originalFilename = Path.GetFileName(file.FileName);
            string fileId = Guid.NewGuid().ToString().Replace("-", "");
            string userId = GetUserId(); // Function to get user id based on your schema
            var path = Path.Combine(Server.MapPath("~/Uploads/Photo/"), userId, fileId);
            file.SaveAs(path);
            eventModel.ImageId = fileId;
            eventmodel.OriginalFilename = originalFilename;
            _db.EventModels.AddObject(eventmodel);
            _db.SaveChanges();
            return RedirectToAction("Index");
        }
        return View(eventmodel);
    }

然而，我会小心使用你的数据模型作为MVC的动作模型。

您应该将您的AvatarUrl更改为:

public HttpPostedFileBase AvatarUrl { get; set; }

在您的视图中，您可以创建一个类似于下面的表单。添加您将接受输入的字段，并为您的头像使用文件输入。当表单发送回控制器时，MVC将尝试将输入绑定到参数。

@using(Html.BeginForm("Create", FormMethod.Post, new { enctype = "multipart/form-data" }) {
    <fieldset>
        @Html.LabelFor(m => m.FirstName)
        @Html.EditorFor(m => m.FirstName)
    </fieldset>
    <!--    
    REST OF YOUR INPUT FIELDS HERE
    -->
    <fieldset>
        @Html.LabelFor(m => m.Avatar)
        @Html.EditorFor(m => m.Avatar)
    </fieldset>
    <input type="submit" value="Submit" />
})

你的控制器方法应该更新为:

[HttpPost]
public ActionResult Create(EmployeeModel model)
{
    if (ModelState.IsValid)
    {
        // Create avatar on server
        var filename = Path.GetFileName(model.AvatarUrl.FileName);
        var path = Path.Combine(Server.MapPath("~/Uploads/Photo/"), filename);
        file.SaveAs(path);
        // Add avatar reference to model and save
        model.AvatarUrl = string.Concat("Uploads/Photo/", filename);
        _db.EventModels.AddObject(model);
        _db.SaveChanges();
        return RedirectToAction("Index");
    }
    return View(model);
}

如果你仍然卡住了，让我知道，我可以更详细地说明。

也有一个很好的/详细的关于你在这里要做什么的文章http://cpratt.co/file-uploads-in-asp-net-mvc-with-view-models/

如果你使用的是。net 6，你可以这样做:

In Model -

public string? imageFileName { get; set; }

In ViewModel -

public IFormFile? image { get; set; }

在cshtml文件(用户输入表单)-

@model yourViewModel
<input asp-for="image">

In controller/Services -

private readonly IHostEnvironment _hostingEnvironment;
private readonly string _path = "";
Constructor(IHostEnvironment hostingEnvironment){
    _hostingEnvironment = hostingEnvironment;
    _path = Path.Combine(_hostingEnvironment.ContentRootPath, "wwwroot", "Images");    
}
//your method that receives the image {
    string fileName = null;
    if (image != null) //type of image is IFormFile
    {
        Guid guid = Guid.NewGuid();
        fileName = $"{guid}.{image.FileName.Split('.').Last()}";
        await SaveInLocalFolder(image, fileName);
    }
//}
private async Task<bool> SaveInLocalFolder(IFormFile file, string fileName)
{
    if (!Directory.Exists(_path))
    {
        Directory.CreateDirectory(_path);
    }
    using (var fileStream = new FileStream(Path.Combine(_path, fileName), FileMode.Create))
    {
        await file.CopyToAsync(fileStream);
    }
    return true;
}

从cshtml文件中像这样访问图像-

<img src="/Images/guid_generated_filename"/>