在dotnet核心模型中添加图片

Question

I have a dotnet core (+razor +ef) application with the usual model of a Product :-)

A product should have a picture associated, uploaded from the Products\\Create.cshtml and Products\\Edit.cshtml pages, stored in a table of the DB, and showed in the Products\\Details.cshtml .

My model is something like this:

public class Product
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public decimal Price { get; set; }
    public byte[] Image { get; set; }
}

First question: is it correct the use of byte[] for the picture?

Second question: since I guess I cannot automatically scaffolding the CRUD pages for a picture, how can I upload the image from the razor Create.cshtml page?

Thanks a lot

Answer 1

In your View you can

1) Either go with embedded image bytes:

<img src="data:image/jpeg;base64,@Convert.ToBase64String(Model.Image)" />

2) Or - use the separate controller action like GetImage below, which returns the file:

<img src="@Url.Action("GetImage", new { productId = Model.Id })" />

In this case you will need an additional controller action like this:

[HttpGet] 
public FileStreamResult GetImage(Guid productId) 
{ 
    using (var dbContext = new DbContext()) 
    { 
        var product = dbContext.Product.FirstOrDefault(x => x.Id == productId); 
        var ms = new MemoryStream(product.Image); 
        return new FileStreamResult(ms, "image/jpeg"); 
    } 
} 

NOTE: if the images are not too big, storing them in DB might be OK. If not - I would suggest to consider storing them on file system (or in cloud storage) with metadata (like file name, etc.) in your database. But that is a different story for sure.