c# - AcceptChanges 无法继续，因为对象的键值与 ObjectStateManager 中的另一个对象冲突

Question

对数据库的更改已成功提交，但更新对象上下文时出错。 ObjectContext 可能处于不一致状态。内部异常消息:AcceptChanges 无法继续，因为对象的键值与 ObjectStateManager 中的另一个对象冲突。在调用 AcceptChanges 之前确保键值是唯一的。

是我收到的错误消息。这是我使用的两个函数...

    public IList<string> GenerateVersions(decimal id, decimal fId, string folderName, string filename, string objFile)
    {
        List<string> generatedFiles = new List<string>();

        foreach (var tCmdSets in db.IMG_SETTINGS_CMDSETS.Where("it.SETTINGS_FOLDER_ID = @folderid", new ObjectParameter("folderid", id)))
        {
            var strDestinationPath = ImageResizer.Util.PathUtils.RemoveExtension(Path.Combine(tmpDefaultFolder, tCmdSets.SETTINGS_CMDSET_DESTINATION, filename));
            ResizeSettings objResizeCommand = new ResizeSettings(tCmdSets.SETTINGS_CMDSET_COMMAND);

            var strCreatedFile = ImageBuilder.Current.Build(objFile, strDestinationPath, objResizeCommand, false, true);
            generatedFiles.Add("### File created: (" + folderName + " » " + tCmdSets.SETTINGS_CMDSET_NAME + " ») " + Path.GetFileName(strCreatedFile));

            IMG_UPLOAD_GENERATED_FILES tObjGenerated = new IMG_UPLOAD_GENERATED_FILES();

            tObjGenerated.UPLOAD_GENERATED_FILE_NAME = Path.GetFileName(strCreatedFile);
            tObjGenerated.UPLOAD_GENERATED_PATH = Path.GetDirectoryName(strCreatedFile);
            tObjGenerated.SETTINGS_CMDSET_ID = tCmdSets.SETTINGS_CMDSET_ID;
            tObjGenerated.UPLOAD_FILE_ID = fId;

            dbHandler.IMG_UPLOAD_GENERATED_FILES.AddObject(tObjGenerated);
            dbHandler.SaveChanges();
        }
        return generatedFiles;
    }

    public ActionResult UploadBulkFiles(decimal id)
    {
        IMG_SETTINGS_FOLDERS img_settings_folders = db.IMG_SETTINGS_FOLDERS.Single(i => i.SETTINGS_FOLDER_ID == id);
        string strBulkDirectory = Path.Combine(tmpDefaultFolder, img_settings_folders.SETTINGS_FOLDER_BULK);
        string[] objFiles = Directory.GetFiles(strBulkDirectory);
        List<string> lstOuput = new List<string>();

        foreach (var tFile in objFiles)
        {
            System.IO.File.Move(tFile, Path.Combine(tmpDefaultFolder, "masters", img_settings_folders.SETTINGS_FOLDER_NAME, Path.GetFileName(tFile)));

            lstOuput.Add("### File moved to masters (" + img_settings_folders.SETTINGS_FOLDER_NAME + " ») " + Path.GetFileName(tFile));

            IMG_UPLOAD_FILES tObjUploadedFile = new IMG_UPLOAD_FILES();

            tObjUploadedFile.UPLOAD_FILE_NAME = Path.GetFileName(tFile);
            tObjUploadedFile.SETTINGS_FOLDER_ID = img_settings_folders.SETTINGS_FOLDER_ID;

            dbHandler.IMG_UPLOAD_FILES.AddObject(tObjUploadedFile);
            dbHandler.SaveChanges();

            var objGeneratedFiles = GenerateVersions(img_settings_folders.SETTINGS_FOLDER_ID,tObjUploadedFile.UPLOAD_FILE_ID, img_settings_folders.SETTINGS_FOLDER_NAME, Path.GetFileName(tFile), Path.Combine(tmpDefaultFolder, "masters", img_settings_folders.SETTINGS_FOLDER_NAME, Path.GetFileName(tFile)));
            lstOuput.AddRange(objGeneratedFiles);
        }
        if (lstOuput.Count > 0)
        {
            return PartialView("UploadSingleFile", lstOuput);
        }
        else
        {
            return PartialView("NoUploads");
        }
    }

数据模型

IMG_UPLOAD_FILE

• UPLOAD_FILE_ID (PK)
• UPLOAD_FILE_NAME
• SETTINGS_FOLDER_ID

IMG_UPLOAD_GENERATED_FILES

• UPLOAD_GENERATED_FILE_ID (PK)
• UPLOAD_GENERATED_FILE_NAME
• UPLOAD_GENERATED_FILE_PATH
• SETTINGS_CMDSET_ID
• UPLOAD_FILE_ID

Answer 1

我对基于 Oracle 数据库的实体模型有完全相同的场景。 Identity 的实现是通过触发器完成的，因此在将表添加到模型时，它不会将标识列的 StoreGenertedPattern 属性设置为 Identity，因为它不知道该列是标识。

需要打开模型编辑器，找到模型中的实体，单击键列并手动将 StoreGenertedPattern 属性设置为“Identity”。