entity-framework-4

问题 The stored Proc returns a column with the value to be either 0 or 1 without converting to BIT. In my POCO, if I declare the field as public bool MyColumn {get; set;} I am getting this error: The specified cast from a materialized 'System.Int32' type to the 'System.Boolean' type is not valid. This actually makes sense since EF recognizes the returned value as an integer. I am wondering that is there any easy way to (add annotation or use fluent api maybe) automatically convert 0/1 to False

问题 I'm using Entity Framework 6 and "model first" in my solution, I separated my "Data Model" classes into another project, so that I can add reference to the "Data Model" classes without exposing my "Data Model Contexts" and connections. I don't want to expose my Entity Data Model project (especially the DB Context etc) to my UI Layer. I have this: I have now successfully separated my auto generated entity classes from my data model, I tried it this works by adding an entity or a property to an

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . Can any body say the exact difference between sqlclient vs entityclient (sys.data.sqlclient vs sys.data.entityclient)? 来源： https:/

问题 I have a linq query like this : var trfplanList = (from at in entities.tdp_ProviderAccomodationType join ap in entities.tdp_ProviderAccomodationTariffPlan on at.PATID equals ap.FK_PATID join ac in entities.tdp_ProviderAccomodationCategory on ap.FK_PACID equals ac.PACID where at.FK_ProviderID == CityID && at.IsApproved == 0 && ap.IsApproved == 0 && ac.AccomodationCategory == "Double Occupy" orderby at.AccomodationType,ap.FromDate,ap.SType select new AccomodationTariff { AccomodationType = at

问题 In our database, we have the following tables Tags Id (int) Name (string) IsActive (bool) TagType (string) and DocumentStyles Id (int) Name (string) StyleRules (string) IsAvailable (bool) ThumbnailFileId (int nullable) ConceptTagId (int nullable) With the EF 4.2 designer, I've created the appropriate entities, and am trying to link the foreign key of ConceptTagId to the Tag model. When I add the association (0..1 to many from Tag to DocumentStyle), it correctly links the foreign key and adds

问题 On the server side of my Silverlight solution, I have 2 projects. Website that serves up the Silverlight page. A Entity Framework data access layer. I have a entity with FirstName and LastName properties on it. I want to add a FullName property that will be available from the Silverlight client side. I have added the property: namespace Server.DAL.Model { public partial class Contact { public string FullName { get { return string.Format("{0} {1}", this.FirstName, this.LastName); } } } } When

问题 I used Entity framework with a database having around 50 tables and it worked just fine. But just to see what happens with a larger database in terms of number of tables/entities i tried to implement the Entity Framework to a database that had around 100+ tables. Once i selected all the tables and clicked on the Finish Button on the Entity Framework Wizard its just hanged my VS 2010 so i could not get any results. My Questions are as below; 1.If I have larger Database in terms of Table

问题 So I know that EF entities track their own changes and persist them to the database when savechanges is called, but what about this scenario... I have a page that is designed to edit a blog post. It has two action methods. [HttpGet] public ViewResult EditBlogPost(int Id) { //This action method gets the blog post by the id and returns the edit blog post page. BlogPost blogPost = db.BlogPosts.Where(x => x.Id == Id).FirstOrDefault(); if (blogPost == null) { ViewData["message"] = "Blog post not

问题 I have created migration and created the database and the tables . For example the tables are A B C D E . Now again I have changed some part of code and ran update-database command . Everything went smooth and nice and the tables showed the columns . Now accidentally I manually deleted one two tables D and E . Now when I try to run the migration with update-database . It runs properly but doesn't create the tables which I deleted manually . I tried to delete the existing migration and re-run

问题 In my application I have the following code... public Boolean SaveUserInformation(UserInfoDTO UserInformation) { return dataManager.SaveUserInfo(new UserInfo() { UserInfoID = UserInformation.UserInfoID.HasValue ? UserInformation.UserInfoID.Value : 0, UserID = UserInformation.UserID, ProxyUsername = UserInformation.ProxyUsername, Email = UserInformation.Email, Status = UserInformation.Status }); } This code calls a method on a dataManager object that utilizes Entity Framework... public Boolean