asp.net mvc - Many to many insert with repository Entity Framework -


my entities:

public class product : base.baseentity {     public product()     {         this.colors = new hashset<color>();     }      [stringlength(50)]     public string productname { get; set; }     public int categoryid { get; set; }     [stringlength(100)]     public string stockfinishes { get; set; }     [stringlength(50)]     public string guarantee { get; set; }     [stringlength(50)]     public string installation { get; set; }      public virtual productentity.category ownercategory { get; set; }     public virtual ilist<variationentity.variation> variations { get; set; }     public virtual icollection<productentity.color> colors { get; set; } }  public class color : base.baseentity {     public color()     {         this.products = new hashset<product>();     }      [stringlength(50)]     public string colorname { get; set; }      public virtual icollection<productentity.product> products { get; set; } }

my controller:

[httppost] public actionresult newproduct(models.dto.productdto.productvm productmodel) {         if (modelstate.isvalid)         {             data.models.orm.entity.productentity.product productentity = new data.models.orm.entity.productentity.product();              productentity.productname = productmodel.productname;             productentity.createdby = user.userid;             productentity.categoryid = productmodel.categoryid;             productentity.stockfinishes = productmodel.stockfinishes;             productentity.guarantee = productmodel.guarantee;             productentity.installation = productmodel.installation;              rpproduct.insert(productentity);             rpproduct.savechanges();              if (productmodel.selectedcolors != null)             {                 foreach (var colorid in productmodel.selectedcolors)                 {                     data.models.orm.entity.productentity.color color = rpcolor.firstordefault(x => x.id == colorid);                     productentity.colors.add(color);                 }                  db.savechanges();             }              return redirecttoaction("productlist");         }         else         {             viewbag.error = "an error occurred while adding new product";             return view();         } }

there no error, product colors not inserted database. can't repository.

how can add product colors repository or without repository?

sorry bad english :(

i prefer manage many many relations myself not entity framework.

in view need table store colors of products columns colorid , productid. there should dbset on dbcontext.

after can save new entity productcolors stores colorid , productid. entities color , product can have reference table, not color , product table.

public class productcolor : base.baseentity {     public productcolor()     {     }      public int colorid { get; set; }     public virtual color color { get; set; }      public int productid { get; set; }     public virtual product product { get; set; } }

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