如何创建我在ASP.net MVC中以VARBINARY数据类型存储在数据库中的图像的EDIT方法和EDIT Razor View？

Question

这是我的创建方法

  /*  [HttpPost]
    public ActionResult Create(Image newRecipe)
    {
        try
        {
            using (var db = new  MitishaKitchenContext())
            {
                db.Images.Add(newRecipe);
                db.SaveChanges();
            }
            return RedirectToAction("Index");
        }
        catch { return View(); }
    }*/

    [HttpPost]
    public ActionResult Create(Image IG)
    {
        // Apply Validation Here



        if (IG == null)
        {
            return new HttpStatusCodeResult(System.Net.HttpStatusCode.BadRequest);
        }

        if (IG != null && IG.File.ContentLength > (2 * 1024 * 1024))
        {
            ModelState.AddModelError("CustomError", "File size must be less than 2 MB");
            return View();
        }
        if (!(IG.File.ContentType == "image/jpeg" || IG.File.ContentType == "image/gif"))
        {
            ModelState.AddModelError("CustomError", "File type allowed : jpeg and gif");
            return View();
        } 

      //  IG.FileName = IG.File.FileName;
      //  IG.ImageSize = IG.File.ContentLength;

        byte[] data = new byte[IG.File.ContentLength];
        IG.File.InputStream.Read(data, 0, IG.File.ContentLength);

        IG.ImageData = data;
        using (MitishaKitchenContext dc = new MitishaKitchenContext())
        {
            dc.Images.Add(IG);
            dc.SaveChanges();
        }
        return RedirectToAction("Index");
    }

}

如何创建我在ASP.net MVC中以VARBINARY数据类型存储在数据库中的图像的EDIT方法和EDIT Razor View？

这是我的创建视图：

{

 @using (Html.BeginForm("Create","Recipes",null,         FormMethod.Post,new   {enctype="multipart/form-data"}))
        {
          @Html.ValidationSummary(true)


         <fieldset>
    <legend>Image</legend>



    <div class="editor-label">
        @Html.LabelFor(model => model.ImageName)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.ImageName)
        @Html.ValidationMessageFor(model => model.ImageName)
    </div>
      <div class="editor-label">
        @Html.LabelFor(model => model.Recipe.RecipeName)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.Recipe.RecipeName)
        @Html.ValidationMessageFor(model => model.Recipe.RecipeName)
    </div>
    <div class="editor-label">
        @Html.LabelFor(model => model.Recipe.RecipeDescriptions)
    </div>
    <div class="editor-field">
        @Html.TextAreaFor(model => model.Recipe.RecipeDescriptions,new {style = "width:90%;height:400px"})
        @Html.ValidationMessageFor(model => model.Recipe.RecipeDescriptions)

    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.Recipe.RecipeIngredients)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.Recipe.RecipeIngredients)
        @Html.ValidationMessageFor(model => model.Recipe.RecipeIngredients)
    </div>


       <br />
    <table>
                <tr>
                    <td>Select File : </td>
                    <td>
                       @Html.TextBoxFor(Model=> Model.File, new{type="file"})
                        @Html.ValidationMessage("CustomError")
                    </td>
                    <td>
                        <input type="submit" value="Upload" />
                    </td>
                </tr>
            </table> 
enter code here
             </fieldset>
     }  

}

Answer 1

您将需要在数据库表中包含以下组件：RecordId，ImageName，RecipeName，RecipeDescriptions，RecipeDescriptions，ImageData。

然后，在编辑中您可以执行以下操作：

[HttpGet]
public ActionResult Edit(int recordId)
{
        using (var db = new  MitishaKitchenContext())
        {
            // fetch data for the image by Id
            var yourmodel = db.Images.Where(x => x.RecordId == recordId).FirstOrDefault();

            if(yourmodel != null)
            {
                 return View("Create", yourmodel);
            }
        }
        return RedirectToAction("Index");
}

您可以使用与“创建”使用的视图相同的视图，因为模型将填充您的字段。 然后，您应该搜索recordId是否存在并向上插入（如果已经存在，则插入或更新）。