ASP.NET Web API將圖像上傳到SQL Server數據庫

Question

我正在使用圖像編寫文章API，並且一直在遵循本教程中有關在ASP.NET Web API中上傳文件的信息， Title和Content已按預期保存到數據庫中。

這里的問題是，我發布的圖像保存到本地文件夾中，但Filename ， Filepath ， Filelength和Filecreatedtime未保存到數據庫中。

使用郵遞員將文章發布到數據庫：

ImageFolder ：

GET索引：

數據庫：

這是我的Article模型：

namespace Wwf_Article.Models
{
    using System;
    using System.Collections.Generic;

    public partial class Article
    {
        public int ID { get; set; }
        public string Title { get; set; }
        public string Content { get; set; }
        public string FileName { get; set; }
        public string FilePath { get; set; }
        public float FileLength { get; set; }
        public DateTime FileCreatedTime { get; 
    }
}

這是我的POST控制器

[Mime]
public async Task<IHttpActionResult> Post()
{

        var fileuploadPath = HttpContext.Current.Server.MapPath("~/ImageFolder");

        var multiFormDataStreamProvider = new MultiFileUploadProvider(fileuploadPath);

        await Request.Content.ReadAsMultipartAsync(multiFormDataStreamProvider);

        string uploadingFileName = multiFormDataStreamProvider.FileData.Select(x => x.LocalFileName).FirstOrDefault();

        Article article = new Article
        {
            Title = HttpContext.Current.Request.Form["Title"],
            Content = HttpContext.Current.Request.Form["Content"],

            //these four lines below aren't saved to DB 
            FilePath = uploadingFileName,
            FileName = Path.GetFileName(uploadingFileName),
            FileLength = new FileInfo(uploadingFileName).Length,
            FileCreatedTime = DateTime.Now
        };

        db.Articles.Add(article);
        db.SaveChanges();

        return Ok();
}

任何想法如何解決此問題？

Answer 1

您提到的以下4四行是Article模型類的一部分嗎？ 我的意思是（FilePath，FileName，FileLength和FileCreatedTime）

Answer 2

1-如果是，我認為您可以使用存儲過程來實現您的請求，如下所示

  CREATE PROC spInsertArticle
   @Title varchar(100),
   @Content varchar(100),
   @FileName varchar(500),
   @FilePath varchar(500),
   @FileLength varchar(500)

AS

  Insert Into ArticleTable(Title,Content,FileName,
        FilePath,FileLength,FileContentTime)
    Values (@Title,@Content,@FileName,
        @FilePath,@FileLength,GetDate())

2-回到您的api項目並創建一個名為ArticleModel的模型類：

        public class ArticleModel
        {
           public string Title {get; set; }
           public string Content {get; set; }
           public string FileName {get; set; }
           public string FilePath {get; set; }
           public string FileLength {get; set; }
        }

3-在ArticleController中創建一個api post方法

  [Route("api/ArticleController/PostArticle")]
    public HttpResponseMessage PostArticle(ArticleModel obj)
    {
        if (ModelState.IsValid)
        {
            try
            {
                string PhotoPath =        Convert.ToString(ConfigurationManager.AppSettings["ImagePath"]);

                ArticleModel newObj = new ArticleModel();

                newObj.Title  = obj.Title ;
                newObj.Content = obj.Content;
                newObj.FileName = obj.FileName;
                newObj.FilePath = obj.FilePath;
                newObjl.FileLength = obj.FileLength;

                if (String.IsNullOrEmpty(newObj.Content))
                {

                }
                else
                {                        
                    string startingFilePath = PhotoPath;

                    string FilePath = SaveImage(newObj.Content, startingFilePath, newObj.FileName);

                    FileInfo fInfo = new FileInfo(FilePath);

                    newObj.Content = fInfo.Name;
                }

                ArticleEntities context = new ArticleEntities();
                var newArticle = context.spInsertArticle(newObj.Title, newObj.Content,
                newObj.FileName, newObj.FilePath, newObj.FileLength);

                return Request.CreateResponse(HttpStatusCode.Created, newArticle);
            }
            catch (Exception ex)
            {
                return Request.CreateResponse(HttpStatusCode.InternalServerError, ex);
            }
        }
        else
        {
            return Request.CreateResponse(HttpStatusCode.BadRequest, ModelState);
        }
    }

4-最后創建PostArticle方法中提到的SaveImage方法

    private string SaveImage(string base64, string FilePath, string ImageName)
    {
        //Get the file type to save in
        var FilePathWithExtension = "";
        string localBase64 = "";

        if (base64.Contains("data:image/jpeg;base64,"))
        {
            FilePathWithExtension = FilePath + ImageName + ".jpg";
            localBase64 = base64.Replace("data:image/jpeg;base64,", "");
        }
        else if (base64.Contains("data:image/png;base64,"))
        {
            FilePathWithExtension = FilePath + ImageName + ".png";
            localBase64 = base64.Replace("data:image/png;base64,", "");
        }
        else if (base64.Contains("data:image/bmp;base64"))
        {
            FilePathWithExtension = FilePath + ImageName + ".bmp";
            localBase64 = base64.Replace("data:image/bmp;base64", "");
        }
        else if (base64.Contains("data:application/msword;base64,"))
        {
            FilePathWithExtension = FilePath + ImageName + ".doc";
            localBase64 = base64.Replace("data:application/msword;base64,", "");
        }
        else if (base64.Contains("data:application/vnd.openxmlformats-officedocument.wordprocessingml.document;base64,"))
        {
            FilePathWithExtension = FilePath + ImageName + ".docx";
            localBase64 = base64.Replace("data:application/vnd.openxmlformats-officedocument.wordprocessingml.document;base64,", "");
        }
        else if (base64.Contains("data:application/pdf;base64,"))
        {
            FilePathWithExtension = FilePath + ImageName + ".pdf";
            localBase64 = base64.Replace("data:application/pdf;base64,", "");
        }

        using (MemoryStream ms = new MemoryStream(Convert.FromBase64String(localBase64)))
        {
            using (FileStream fs = new FileStream(FilePathWithExtension, FileMode.Create, FileAccess.Write))
            {
                //Create the specified directory if it does not exist
                var photofolder = System.IO.Path.GetDirectoryName(FilePathWithExtension);
                if (!Directory.Exists(photofolder))
                {
                    Directory.CreateDirectory(photofolder);
                }

                ms.WriteTo(fs);
                fs.Close();
                ms.Close();
            }
        }

        return FilePathWithExtension;
    }

5，以郵遞員或招搖工具嘗試此操作，它將為您服務。 我可以進行任何討論

Answer 3

首先，創建一個通用接口倉庫類

   public interface IRepository<T> where T : class
   {
        T GetById(int id);
        void Add(T entity);
   }

Answer 4

創建一個將實現接口的類

        public class EFRepository<T> : IRepository<T> where T : class
        {
                   public EFRepository(PayrollcshrnewEntities dbContext)
                    {
                            if (dbContext == null)
                                  throw new ArgumentNullException("dbContext");
                            DbContext = dbContext;
                            DbSet = DbContext.Set<T>();
          }

           protected ArticleEntities DbContext { get; set; }

           protected DbSet<T> DbSet { get; set; }

                public virtual T GetById(int id)
                {            
                       return DbSet.Find(id);
                 }

                 public virtual void Add(T entity)
                 {
                      DbEntityEntry dbEntityEntry = DbContext.Entry(entity);
                      if (dbEntityEntry.State != EntityState.Detached)
                      {
                            dbEntityEntry.State = EntityState.Added;
                       }
                       else
                      {
                              DbSet.Add(entity);
                       }
              }
          }

Answer 5

由於某種原因，在刪除edmx並使用ADO重新創建EF設計器表之后，POST控制器開始工作。

事實證明edmx圖中缺少字段。

謝謝大家的幫助