Entity Framework

Question

I m using Entity Framework in my mvc application.The entity framework has created data model of my Database.In my Model,I want to declare some attributes to my model properties.for Example(Display Name above my property).Now i make changes to Database model and if i update the model,those properties are gone.

Should I create another model with same properties or any other method to avoid this.Please suggest me a method to avoid this.

Thanks

Muralidharan Deenathayalan · Answer

If you make any changes in the generated Person.cs class you changes will be gone. Please try with the metadata behaviour to extend the existing person class. http://weblogs.asp.net/rajbk/archive/2010/05/04/a-basic-t4-template-for-generating-model-metadata-in-asp-net-mvc2.aspx http://drc.ideablade.com/xwiki/bin/view/Documentation/model-metadata-class http://stackoverflow.com/questions/7868230/attaching-metadata-class-to-ado-net-entity-data-model-classes http://www.codeproject.com/Articles/148486/Adding-Metadata-to-Entities-in-The-Data-Model

Mohamed Sherif · Answer

Thanks For Your Reply.Hope this might help me in later part. But my question was Public Class Person { [Display Name][Required] public string Name public int age } The Display NameRequired attirbutes are gone if i regenerate Database.Can you please help on this.

Sanjay Kumar · Answer

Hi http://www.itorian.com/2012/09/using-stored-procedure-entity-framework.html

Muralidharan Deenathayalan · Answer

You should use partial class for this. For example in your EDM you have person class with the following properties and Person.cs looks like the below one. Person.cs public partial class Person { //extra code removes for readability Name Age Gender Title } In the same project add one PersonExtened.cs or some thing like that. public partial class Person { DisplayName Address } Compile the code. When you're creating object you should be able to Person class with NameDisplayNameAddress etc properties. Don't modify directly to the edm file. When you're doing updating the database you might loose you're changes. Hope this helps you.