无法使用asp.net mvc上传多个数据库图像

我正在尝试将多个数据库映像上传到 SQL Server 2008R2。我在 C# 中使用 ASP.NET MVC 3。发生的情况是我显示了图像，但问题是第二张图像显示了两次。所以它是重复的。我不确定为什么第一张图像没有显示。

我的 SubProductCategory4 表具有以下列（为了简单起见）...

列名称：Image1 和 Image2 的数据类型为 varbinary(MAX)，另一列名称：ImageMimeType 的数据类型为 varchar(50)。

我的控制器具有以下 Create 方法代码...

[HttpPost]
    public ActionResult Create([Bind(Exclude = "SubProductCategoryFourID")] SubProductCategory4 Createsubcat4, IEnumerable<HttpPostedFileBase> files, FormCollection collection)
    {
        if (ModelState.IsValid)
        {
           foreach (string inputTagName in Request.Files)
           {

     if (Request.Files.Count > 0) // tried Files.Count > 1 did 
                                          // not solve the problem
                    {
                        Createsubcat4.Image1 = (new FileHandler()).uploadedFileToByteArray((HttpPostedFileBase)Request.Files[inputTagName]);
                        Createsubcat4.Image2 = (new FileHandler()).uploadedFileToByteArray((HttpPostedFileBase)Request.Files[inputTagName]);
                        // var fileName = Path.GetFileName(inputTagName);
                        //var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);
                    }
                    // moved db.AddToSubProductCategory4(Createsubcat4);
                    // here  but did not solve the problem
           }
            db.AddToSubProductCategory4(Createsubcat4);
            db.SaveChanges();
            return RedirectToAction("/");
        }


   //someother code

        return View(Createsubcat4);
    } 

获取图像方法...

public FileResult GetImage(int id)
    {
        const string alternativePicturePath = @"/Content/question_mark.jpg";
        MemoryStream stream;
        MemoryStream streaml;

        SubProductCategory4 z = db.SubProductCategory4.Where(k => k.SubProductCategoryFourID == id).FirstOrDefault();

        if ((z != null && z.Image1 != null) && (z != null && z.Image2 != null))
        {

                stream = new MemoryStream(z.Image1);
                streaml = new MemoryStream(z.Image2);
        }

        else
        {
              var path = Server.MapPath(alternativePicturePath);

             foreach (byte item in Request.Files)
              { 
                HttpPostedFileBase file = Request.Files[item];
                if (file.ContentLength == 0)
                {
                    continue;
                }
             }

            stream = new MemoryStream();
            var imagex = new System.Drawing.Bitmap(path);
            imagex.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
            stream.Seek(0, SeekOrigin.Begin);

           /* streaml = new MemoryStream();
            var imagey = new System.Drawing.Bitmap(path);
            imagey.Save(streaml, System.Drawing.Imaging.ImageFormat.Jpeg);
            streaml.Seek(0, SeekOrigin.Begin);*/
        }

       return new FileStreamResult(stream,"image/jpg");

    }

文件处理程序.cs

public class FileHandler
{
    public byte[] uploadedFileToByteArray(HttpPostedFileBase file)
    {
        int nFileLen = file.ContentLength;
        byte[] result = new byte[nFileLen];

        file.InputStream.Read(result, 0, nFileLen);

        return result;
    }

}

创建.cshtml...

     @using (Html.BeginForm("Create", "ProductCategoryL4", "GetImage",  
     FormMethod.Post, new { enctype = "multipart/form-data" }))    
      //some code then...
     <div class="editor-field">
     @Html.EditorFor(model => model.Image1)
    <input type="file" id="fileUpload1" name="fileUpload1" size="23"/>
     @Html.ValidationMessageFor(model => model.Image1)
    </div>

     <div class="editor-field">
     @Html.EditorFor(model => model.Image2)
     <input type="file" id="fileUpload2" name="fileUpload2" size="23"/>
     @Html.ValidationMessageFor(model => model.Image2)
    </div>

索引.cshtml...

<img src="@Url.Action("GetImage", "ProductCategoryL4", new { id =   
item.SubProductCategoryFourID })" alt="" height="100" width="100" /> 
</td>
  <td>
    <img src="@Url.Action("GetImage", "ProductCategoryL4", new { id = 
    item.SubProductCategoryFourID })" alt="" height="100" width="100" /> 
  </td>

我正在使用 VS2010、C# 中的 ASP.NET MVC3 和 SQL Server 2008R2。提前致谢，但请仅在您知道答案的情况下回复。如果有更好的方法，请告诉我。

列出的代码循环遍历文件，并为每个文件设置Image1 and Image2是同一件事。当您上传 2 个文件时，它们都显示为图像 2，因为这是应用于这两个字段的最后一个图像。

尝试用类似这样的东西替换循环，如果有足够的图像，一次设置一个字段。

FileHandler fh = new FileHandler();

if (Request.Files.Count > 0)
{
    Createsubcat4.Image1 = fh.uploadedFileToByteArray(Request.Files[0]);
}

if (Request.Files.Count > 1)
{
    Createsubcat4.Image2 = fh.uploadedFileToByteArray(Request.Files[1]);
}

db.AddToSubProductCategory4(Createsubcat4);

如果您需要打开它以允许将来显示更多图像，您需要替换Image1 and Image2包含图像集合的字段，并再次使用循环将每个图像添加到上传的文件集合中。像这样的东西：

FileHandler fh = new FileHandler();

foreach (HttpPostedFileBase uploadedImage in Request.Files)
{
    Createsubcat4.Images.Add(fh.uploadedFileToByteArray(uploadedImage));
}

db.AddToSubProductCategory4(Createsubcat4);
db.SaveChanges();

EDIT:

现在您已经正确保存了图像，您需要再次查看您的GetImage行动。您会注意到您已将两个文件正确加载到内存中，但是当您指定操作结果时（return new FileStreamResult(stream,"image/jpg");）你只返回第一个流。您需要一种在请求时返回第二个流的方法。有几种方法可以解决此问题，添加另一个输入参数来指定要加载的图像或创建仅返回第二个图像的第二个操作。

要创建两个操作设置，您的代码将如下所示：

public ActionResult GetImage1(int id)
{
    const string alternativePicturePath = @"/Content/question_mark.jpg";
    MemoryStream stream;

    SubProductCategory4 z = db.SubProductCategory4.Where(k => k.SubProductCategoryFourID == id).FirstOrDefault();

    if (z != null && z.Image1 != null)
    {
        stream = new MemoryStream(z.Image1);
    }
    else
    {
        var path = Server.MapPath(alternativePicturePath);

        stream = new MemoryStream();
        var imagex = new System.Drawing.Bitmap(path);
        imagex.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
        stream.Seek(0, SeekOrigin.Begin);
    }

    return new FileStreamResult(stream,"image/jpg");
}

public ActionResult GetImage2(int id)
{
    const string alternativePicturePath = @"/Content/question_mark.jpg";
    MemoryStream stream;

    SubProductCategory4 z = db.SubProductCategory4.Where(k => k.SubProductCategoryFourID == id).FirstOrDefault();

    if (z != null && z.Image2 != null) // the difference is here
    {
        stream = new MemoryStream(z.Image2); // the difference is also here
    }
    else
    {
        var path = Server.MapPath(alternativePicturePath);

        stream = new MemoryStream();
        var imagex = new System.Drawing.Bitmap(path);
        imagex.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
        stream.Seek(0, SeekOrigin.Begin);
    }

    return new FileStreamResult(stream,"image/jpg");
}

这些函数几乎相同，并且可以轻松制作 1，它采用一个参数来选择要加载的图像。

public ActionResult GetImage(int id, int? imageNum)
{
    imageNum = imageNum ?? 0;

    const string alternativePicturePath = @"/Content/question_mark.jpg";
    MemoryStream stream;

    SubProductCategory4 z = db.SubProductCategory4.Where(k => k.SubProductCategoryFourID == id).FirstOrDefault();

    byte[] imageData = null;

    if (z != null)
    {
        imageData = imageNum == 1 ? z.Image1 : imageNum == 2 ? z.Image2 : null;
    }

    if (imageData != null)
    {
        stream = new MemoryStream(imageData);
    }
    else
    {
        var path = Server.MapPath(alternativePicturePath);

        stream = new MemoryStream();
        var imagex = new System.Drawing.Bitmap(path);
        imagex.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
        stream.Seek(0, SeekOrigin.Begin);
    }

    return new FileStreamResult(stream,"image/jpg");
}

该函数将指定imageNum作为查询参数，例如：

http://www.mydomain.com/controllerName/GetImage/{id}?imageNum={imageNum}