Question

在我的应用程序中，我必须上传一个ZIP文件然后我必须使其可用，以便我们可以再次下载该文件。由于我是MVC的新手，我使用varbinary将数据存储在数据库中。这是我的观看代码：

@using (Html.BeginForm("Upload", "Createnews", FormMethod.Post, new { enctype = "multipart/form-data" }))

{ @ Html.AntiForgeryToken（）

<div class="form-horizontal">
    <h4>Createnew</h4>
    <hr />
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })
    <div class="form-group">
        @Html.LabelFor(model => model.CategoryId, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.CategoryId, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.CategoryId, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @*@using (Html.BeginForm("Upload", "Createnews", FormMethod.Post, new { enctype = "multipart/form-data" }))
        {*@
            <table>
                <tr>
                    <td>File:</td>
                    <td>
                        <input type="file" name="UploadedFile" />
                    </td>
                </tr>
                <tr>
                    <td colspan="2">
                        @*<input type="submit" name="Upload" value="Submit" />*@
                    </td>
                </tr>
            </table>
        @*}*@
        @Html.LabelFor(model => model.Complete_ZIP_file, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Complete_ZIP_file, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Complete_ZIP_file, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.CategoryName, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.CategoryName, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.CategoryName, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.SubCategoryId, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.SubCategoryId, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.SubCategoryId, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.SubCategoryName, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.SubCategoryName, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.SubCategoryName, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
            @*<input type="submit" value="Create" class="btn btn-default" />*@<input type="submit" name="Upload" value="Submit" />
        </div>
    </div>
</div>

}

然后我在控制器中编写了以下代码： public ActionResult Upload（[Bind（Include =＆＃34; CategoryId，Complete_ZIP_file，CategoryName，SubCategoryId，SubCategoryName＆＃34;）] Createnew createnew） {

        if (Request != null)
        {
            HttpPostedFileBase file = Request.Files["UploadedFile"];

            if ((file != null) && (file.ContentLength > 0) && !string.IsNullOrEmpty(file.FileName))
            {
                string fileName = file.FileName;
                string fileContentType = file.ContentType;
                byte[] fileBytes = new byte[file.ContentLength];
                file.InputStream.Read(fileBytes, 0, Convert.ToInt32(file.ContentLength));

                createnew.Complete_ZIP_file = fileBytes;
        }}
         if (ModelState.IsValid)
        {

            db.Createnews.Add(createnew);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        //return View(createnew)
        return View("Create");
    }

现在，我将结果存储在相应的字段中。现在，我将不得不下载它。那么，如何将这种varbinary格式再次转换为ZIP文件呢？

提前致谢。

Answer 1

你不需要转换为varbinary来拉链。你可以直接写回复。

    public ActionResult Download()
    {
        //read varbinary field from db
        byte[] output = GetOutputFromDb();
        return File(output, "application/zip", "fileName.zip");
    }

如何将数据库中的varbinary文件解压缩为ZIP文件？

1 个答案: