entity-framework-4

Hi I am binding a WPF textbox to an Entity Framework property as follows: <TextBox Grid.Column="1" Grid.Row="0" Margin="5,2" Text="{Binding Path=MyEntityObject.SizeLower, Mode=TwoWay}" /> It binds fine to the property and when I change it, it saves to the DB as expected. But if I delete the content of the Textbox I get the red error border around it. I dont have any validator in place so I am guessing the texbox is complaining about the value not being nullable. But in fact this property in the DB is nullable, so I cannot understand why it would error. The system generated EF property

I have a situation where I have a table of entries that I'll be querying on, but in some cases I'll have additional information available. For instance, if I have a table of people , I want to be able to search by name, but I also want to store some coordinates and search based on their location, but also expose that distance in the object model. So, for instance, suppose my people table looks something like this: PersonId int Name nvarchar(100) Address nvarchar(100) Latitude float(10,6) Longitude float(10,6) And the entity class is defined like this: public class Person { public int PersonId

I have a web project which works perfectly locally. But when I change the connection string in my published web site on Azure to connect to my database on SQL Azure it will start giving this error. System.Data.Entity.Infrastructure.UnintentionalCodeFirstException: Code generated using the T4 templates for Database First and Model First development may not work correctly if used in Code First mode. To continue using Database First or Model First ensure that the Entity Framework connection string is specified in the config file of executing application. To use these classes, that were generated

Hi I'm back with another question,I have started using EF and I'm having problem with it. OverView: I made an EF model ,and found out that one table (named UserRoles) didn't showed up in the EF Model Diagram ,I tried to add it through "Update data model" ,but wizard didn't showed me that table to add (as if it was already added) ,I also tried to refresh model through "Update data model" wizard it was not helpful. Problem Explained: The original DB Diagram. Partial EF Model Diagram I tried to add it through "Update data model" I tried to rename an entity in the EF diargram to "UserRoles",an

Is there a good reason why the Table attribute (which can be used to map a POCO class to the correct database name/schema) is in the EntityFramework.dll? Doesn't this prevent you from creating a Domain project that simply contains your entities with no dependency on a specific data access technology? For example, if I use this attribute I don't believe the classes would be portable to Silverlight. Is this an oversight, or am I missing something? I realize I could use the fluent API to circumvent this, but the attribute seems preferable for this purpose. I think because the TableAttribute has

I want my application to verify database consitency at startup time. Is there an easy way to verify whether or not the database schema is exactly what I expect it to be using Entity Framework? EF4 itself does some verification. If a mapped type contains a column that does not exist in the target table, when EF4 is materializing it triggers an exception. Fine. However there are some things it does not do: It does not verify the entire database at first. It does not trigger an exception when the target table contains a column that is not mapped. Is there an easy way I can accomplish that? As to

I'm trying to make a query where I cast a text column, which contains an integer as text, to an Int32. Here's the query: SELECT VALUE t FROM MyEntities AS t WHERE CAST(t.TextColumn AS Edm.Int32) > 5 However, I get an System.Data.EntitySqlException with the following message: Type 'Edm.Int32' could not be found. Make sure that the required schemas are loaded and that the namespaces are imported correctly. Near type name, line 1, column 75. According to MSDN , Edm.Int32 should be a valid type. Does anyone know what's wrong? Edit: After some trial and error, I found that the following works:

I am a newbie with Entity Framework and I need to insert an object Comment that has a related FK object User into the database. public Class Comment { public int CommentID { get; set; } public string CommentContent { get; set; } public virtual User User { get; set; } public virtual DateTime CommentCreationTime { get; set; } } public class User { public int UserID { get; set; } public string UserName { get; set; } public string UserPassword { get; set; } public string UserImageUrl{get; set;} public DateTime UserCreationDate { get; set; } public virtual List<Comment> Comments { get; set; } }