entity-framework-4.1

问题 I've system that has a primary data model to perform most of the work. The model has quite a few tables and with performance in mind when I came to add an administrative feature to the application I decided to use a second separate data model. All works well until my second data model needs to access a table that is also in the primary data model. Now, from digging around I can see this can cause problems. The two possible workaround I've come up with are to either: Put the data models in

问题 I have two tables: DeptMaster and LaborMaster where one DeptMaster has many LaborMasters. These are legacy tables from an old database so they don't follow Code First naming conventions. They both use composite keys but with different column names in each table. The classes have navigational properties as well. I would prefer mapping them with attributes but please show me that method if possible but also the fluent way. [Table("DeptMaster"), Schema="HR"] public partial class DeptMaster {

问题 Am new for hamdling Entity Framework.I use the following code for insert the file from fileupload button in mvc4 public ActionResult Index(NewUserModel newUser) { Resume newuserResume = new Resume(); if (Request != null) { HttpPostedFileBase file = Request.Files["UploadedFile"]; if ((file != null) && (file.ContentLength > 0) && !string.IsNullOrEmpty(file.FileName)) { string fileName = file.FileName; string fileextn = Path.GetExtension(fileName); if (fileextn == ".pdf" || fileextn == ".doc") {

问题 Hi im trying to run my MVC 3 application running SQLCE 4 embedded and EF4.1 i have used the data access methods as described in this tutorial This works perfectly locally(obviously), but when running it on my hosting i get the below error message. It is a shared hosting enviroment. Is it an open connection that is the problem? Shouldn't it be handled by the unit of work class that is returning the dbcontext as a singleton throughout the whole application as mentioned in the tutorial? Any tips

问题 I know this question has been asked/answered but I can't find it for the life of me. I am creating and ASP.NET MVC 3 app with an existing db but wanted to go code first so I'm used the EF Power Tools CTP1 to get me started. Ultimately, I will refactor to a better solution but to get going I used the MVCScaffolding to gen up controllers and views. I'm struggling with creating a display value ( FullName ) property on my model that is a combination of the FirstName and LastName columns in the DB

问题 I was getting the following error when runing such this code: var dbContext = new MyDbContext(); var list = dbContext.Set<TEntity>().ToList(); From the changes I made recently to codes I understood that because I added an event to the base class it causes all the problems: public PropertyChangedEventHandler PropertyChangedEvent { get; set; } Applying the NotMapped attribute to the above property my codes now are working again. Now I want to know if there is anyway to autmatically tell

问题 I have an existing table in my database and I want to create some additional tables using Code First/Fluent API (whatever way you may want to categorize it). Following is my DbContext : public class MyContext : DbContext { public DbSet<Entity1> Entities1 { get; set; } public DbSet<Entity2> Entties2 { get; set; } public MyContext() : base(@"data source=....;") {} protected override void OnModelCreating(DbModelBuilder modelBuilder) { Database.SetInitializer(new MyContextInitializer());

问题 I have a database that I created for a site using Entity Framework 4.1 code first. I need to add a simple property to one of my entity classes, and add a corresponding (possibly nullable) column to the database without losing any of the data in the database. I think I can take down the site, alter the database to add the column, and redeploy website with an updated entity class, but I'm not sure that's the best way to do this schema upgrade. Is there a standard (or just better) way of doing a

问题 I'm working on a POCO entities model on an existing database. One table has a compound key public class Table1 { [Key] public virtual int Key1 {get; set;} [Key] public virtual int Key2 {get; set;} public virtual ICollection<Table2> Tables2 {get; set;} //more properties here... } and a second table with no primary key, but 2 properties referencing the compound key of Table1. public class Table2 { public virtual int Key1 {get; set;} public virtual int Key2 {get; set;} [InverseProperty("Tables2"

问题 I'm trying to create ASP.NET MVC Application with Entity Framework, which has One to Many relationship. For that I have successfully managed to load the appropriate list of items to a dropdown control (in Create view), But when I click the Create button (in Create view) page validation is faild, validation error message is The value '1' is invalid. . Error Model public class Post { public int Id { get; set; } ... public virtual Person Author { get; set; } } DataBaseContext protected override