C# “HttpPostedFileBase”未定义键_C#_Asp.net Mvc_Entity Framework_Ef Code First

C# “HttpPostedFileBase”未定义键

c# asp.net-mvc entity-framework

C# “HttpPostedFileBase”未定义键,c#,asp.net-mvc,entity-framework,ef-code-first,C#,Asp.net Mvc,Entity Framework,Ef Code First,我有一个web应用程序将图像上传到数据库并检索它们 public class ImageGallery { [Key] public int ImageID { get; set; } public int ImageSize { get; set; } public string FileName { get; set; } public byte[] ImageData { get; set; } [Required(ErrorMessage=

我有一个web应用程序将图像上传到数据库并检索它们

public class ImageGallery
{
    [Key]
    public int ImageID { get; set; }
    public int ImageSize { get; set; }
    public string FileName { get; set; }
    public byte[] ImageData { get; set; }
    [Required(ErrorMessage="Please select Image File")]
    public HttpPostedFileBase file { get; set; }
}

我的数据库上下文类是这样的

public class MyDatabaseEntities : DbContext
{
    public DbSet<ImageGallery> ImageGalleries { get; set; }
}

现在，当我试图上传图像，它给我以下错误

EntityType“HttpPostedFileBase”未定义键。定义此EntityType的键。HttpPostedFileBase:EntityType:EntitySet“HttpPostedFileBase”基于未定义键的类型“HttpPostedFileBase”

我已经看到了关于堆栈溢出的一个问题--。我尝试了这个解决办法，但没有成功

我关注这个博客就是为了这个目的---

不能将HttpPostedFileBase存储在包含多个属性的复杂对象的数据库字段中。您可以使用[NotMapped]属性排除此项，但是您的模型和视图实际上没有关系，不包括模型其他属性的任何输入

相反，你的观点可以是公正的

@using (Html.BeginForm("Upload", "ImageGallery", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <input type="file" name="file" />
    <input type = "submit" value="Upload" />
}

相反，你的观点可以是公正的

@using (Html.BeginForm("Upload", "ImageGallery", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <input type="file" name="file" />
    <input type = "submit" value="Upload" />
}

只需尝试具有如下属性的新视图模型---

    public class ImageViewModel
   {
    public int ImageID { get; set; }
    public int ImageSize { get; set; }
    public string FileName { get; set; }
    public byte[] ImageData { get; set; }
    public HttpPostedFileBase File { get; set; }
   }

    public ActionResult Upload(HttpPostedFileBase file)
    {
        ImageGallery IG = new ImageGallery();
    IG.FileName = file.FileName;
      IG.ImageSize = file.ContentLength;

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

           IG.ImageData = data;

        var model = new ImageViewModel
        {
            FileName = file.FileName,
            ImageSize = file.ContentLength,
            ImageData = data,
            File = file
        };


        using(MyDatabaseEntities dc = new MyDatabaseEntities())
        {
            dc.ImageGalleries.Add(IG);
            dc.SaveChanges();
        }
        return View(model);

    }

}

    @model Image.Models.ImageViewModel

<h2>Upload</h2>
 @using (Html.BeginForm("Upload", "ImageGallery", FormMethod.Post, new { enctype = "multipart/form-data" }))
 {
  @Html.ValidationSummary(true)
  <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>
 }

然后像这样更换控制器---

    public class ImageViewModel
   {
    public int ImageID { get; set; }
    public int ImageSize { get; set; }
    public string FileName { get; set; }
    public byte[] ImageData { get; set; }
    public HttpPostedFileBase File { get; set; }
   }

    public ActionResult Upload(HttpPostedFileBase file)
    {
        ImageGallery IG = new ImageGallery();
    IG.FileName = file.FileName;
      IG.ImageSize = file.ContentLength;

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

           IG.ImageData = data;

        var model = new ImageViewModel
        {
            FileName = file.FileName,
            ImageSize = file.ContentLength,
            ImageData = data,
            File = file
        };


        using(MyDatabaseEntities dc = new MyDatabaseEntities())
        {
            dc.ImageGalleries.Add(IG);
            dc.SaveChanges();
        }
        return View(model);

    }

}

    @model Image.Models.ImageViewModel

<h2>Upload</h2>
 @using (Html.BeginForm("Upload", "ImageGallery", FormMethod.Post, new { enctype = "multipart/form-data" }))
 {
  @Html.ValidationSummary(true)
  <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>
 }

}

然后像这样更改您的查看页面---

    public class ImageViewModel
   {
    public int ImageID { get; set; }
    public int ImageSize { get; set; }
    public string FileName { get; set; }
    public byte[] ImageData { get; set; }
    public HttpPostedFileBase File { get; set; }
   }

    public ActionResult Upload(HttpPostedFileBase file)
    {
        ImageGallery IG = new ImageGallery();
    IG.FileName = file.FileName;
      IG.ImageSize = file.ContentLength;

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

           IG.ImageData = data;

        var model = new ImageViewModel
        {
            FileName = file.FileName,
            ImageSize = file.ContentLength,
            ImageData = data,
            File = file
        };


        using(MyDatabaseEntities dc = new MyDatabaseEntities())
        {
            dc.ImageGalleries.Add(IG);
            dc.SaveChanges();
        }
        return View(model);

    }

}

    @model Image.Models.ImageViewModel

<h2>Upload</h2>
 @using (Html.BeginForm("Upload", "ImageGallery", FormMethod.Post, new { enctype = "multipart/form-data" }))
 {
  @Html.ValidationSummary(true)
  <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>
 }

只需尝试具有如下属性的新视图模型---

    public class ImageViewModel
   {
    public int ImageID { get; set; }
    public int ImageSize { get; set; }
    public string FileName { get; set; }
    public byte[] ImageData { get; set; }
    public HttpPostedFileBase File { get; set; }
   }

    public ActionResult Upload(HttpPostedFileBase file)
    {
        ImageGallery IG = new ImageGallery();
    IG.FileName = file.FileName;
      IG.ImageSize = file.ContentLength;

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

           IG.ImageData = data;

        var model = new ImageViewModel
        {
            FileName = file.FileName,
            ImageSize = file.ContentLength,
            ImageData = data,
            File = file
        };


        using(MyDatabaseEntities dc = new MyDatabaseEntities())
        {
            dc.ImageGalleries.Add(IG);
            dc.SaveChanges();
        }
        return View(model);

    }

}

    @model Image.Models.ImageViewModel

<h2>Upload</h2>
 @using (Html.BeginForm("Upload", "ImageGallery", FormMethod.Post, new { enctype = "multipart/form-data" }))
 {
  @Html.ValidationSummary(true)
  <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>
 }

然后像这样更换控制器---

    public class ImageViewModel
   {
    public int ImageID { get; set; }
    public int ImageSize { get; set; }
    public string FileName { get; set; }
    public byte[] ImageData { get; set; }
    public HttpPostedFileBase File { get; set; }
   }

    public ActionResult Upload(HttpPostedFileBase file)
    {
        ImageGallery IG = new ImageGallery();
    IG.FileName = file.FileName;
      IG.ImageSize = file.ContentLength;

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

           IG.ImageData = data;

        var model = new ImageViewModel
        {
            FileName = file.FileName,
            ImageSize = file.ContentLength,
            ImageData = data,
            File = file
        };


        using(MyDatabaseEntities dc = new MyDatabaseEntities())
        {
            dc.ImageGalleries.Add(IG);
            dc.SaveChanges();
        }
        return View(model);

    }

}

    @model Image.Models.ImageViewModel

<h2>Upload</h2>
 @using (Html.BeginForm("Upload", "ImageGallery", FormMethod.Post, new { enctype = "multipart/form-data" }))
 {
  @Html.ValidationSummary(true)
  <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>
 }

}

然后像这样更改您的查看页面---

    public class ImageViewModel
   {
    public int ImageID { get; set; }
    public int ImageSize { get; set; }
    public string FileName { get; set; }
    public byte[] ImageData { get; set; }
    public HttpPostedFileBase File { get; set; }
   }

    public ActionResult Upload(HttpPostedFileBase file)
    {
        ImageGallery IG = new ImageGallery();
    IG.FileName = file.FileName;
      IG.ImageSize = file.ContentLength;

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

           IG.ImageData = data;

        var model = new ImageViewModel
        {
            FileName = file.FileName,
            ImageSize = file.ContentLength,
            ImageData = data,
            File = file
        };


        using(MyDatabaseEntities dc = new MyDatabaseEntities())
        {
            dc.ImageGalleries.Add(IG);
            dc.SaveChanges();
        }
        return View(model);

    }

}

    @model Image.Models.ImageViewModel

<h2>Upload</h2>
 @using (Html.BeginForm("Upload", "ImageGallery", FormMethod.Post, new { enctype = "multipart/form-data" }))
 {
  @Html.ValidationSummary(true)
  <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>
 }

试试这个

[NotMapped]
public HttpPostedFileBase File { get; set; }

这不会映射到数据库

出现此错误是因为它们的表中没有数据类型HttpPostedFileBase

[NotMapped]
public HttpPostedFileBase File { get; set; }

这不会映射到数据库

发生此错误的原因是表中没有数据类型HttpPostedFileBase

您无法在数据库中存储HttpPostedFileBase。将其从数据模型中删除，并使用包含该属性的视图模型。@StephenMuecke然后我将不得不进行许多更改。是否可以仅在数据模型和控制器中进行一些更改以使其工作？是否需要在视图中显示/编辑ImageGallery的任何属性？如果没有，那么只需使用public ActionResult UploadHttpPostedFileBase文件，并在视图中从数据模型中删除该属性，它仍然没有完全意义……如果我删除该属性，然后像这样尝试--public ActionResult UploadImageGallery IG，HttpPostedFileBase文件{file.FileName=IG.FileName；在这里我无法设置要保存到db中的文件名和内容长度属性。我在这里没有意义。请以其他方式查看代码：-IG.FileName=file.FileName；无法在数据库中存储HttpPostedFileBase。请将其从数据模型中删除并使用包含该属性的视图模型。@StephenMuecke然后我将不得不进行许多更改。是否可以仅在数据模型和控制器中进行一些更改以使其正常工作？是否需要在视图中显示/编辑ImageGallery的任何属性？如果不需要，则只需在视图中使用public ActionResult UploadHttpPostedFileBase文件和从数据模型中删除该属性仍然没有完全意义…如果我删除该属性，然后像这样尝试--public ActionResult UploadImageGallery IG，HttpPostedFileBase文件{file.FileName=IG.FileName；在这里，我无法设置要保存到db中的文件名和内容长度属性。我在这里没有意义。请以其他方式查看代码：-IG.FileName=file.FileName；您要求我添加一个答案，我已经完成了，您接受另一个答案，其中just剽窃了我的。祝你以后好运。你让我添加一个答案，我已经做了，你接受了另一个剽窃我的答案。祝你以后好运得到任何帮助。