ASP.NET MVC 4 C#HttpPostedFileBase,如何存储文件

Question

模型

public partial class Assignment
{
    public Assignment()
    {
        this.CourseAvailables = new HashSet<CourseAvailable>();
    }

    public string AssignmentID { get; set; }
    public Nullable<System.DateTime> SubmissionDate { get; set; }
    public string Status { get; set; }
    public Nullable<decimal> Mark { get; set; }
    public string Comments { get; set; }
    public string FileLocation  { get; set; }
    public virtual ICollection<CourseAvailable> CourseAvailables { get; set; }
}}

调节器

 public ActionResult Create(Assignment assignment)
    {
        if (ModelState.IsValid)
        {


            db.Assignments.Add(assignment);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        return View(assignment);
    }

视图

<div class="editor-field">
    <%: Html.TextBoxFor(model => model.FileLocation, new { type="file"})%>
    <%: Html.ValidationMessageFor(model => model.FileLocation) %>
</div>

如果我想将文件存储到server/path文件夹中,并且在数据库中我只想存储路径名/字符串,如何存储文件.

Answer 1

你可以上传文件并将其url保存在数据库表中,如下所示:

视图:

@using(Html.BeginForm("Create","Assignment",FormMethod.Post,new {enctype="multipart/form-data"}))
{
    ...
    <div class="editor-field">
        <%: Html.TextBoxFor(model => model.FileLocation, new { type="file"})%>
        <%: Html.ValidationMessageFor(model => model.FileLocation) %>
    </div>
    ...
}

行动:

[HttpPost]
public ActionResult Create(Assignment assignment)
{
    if (ModelState.IsValid)
    {
        if(Request.Files.Count > 0)
        {
            HttpPostedFileBase file = Request.Files[0];
            if (file.ContentLength > 0) 
            {
                var fileName = Path.GetFileName(file.FileName);
                assignment.FileLocation = Path.Combine(
                    Server.MapPath("~/App_Data/uploads"), fileName);
                file.SaveAs(assignment.FileLocation);
            }
            db.Assignments.Add(assignment);
            db.SaveChanges();
            return RedirectToAction("Index");
        }
    }

    return View(assignment);
}

细节:

为了更好地理解,请参阅这篇好文章使用ASP.NET MVC上传文件(或文件)