I have a class which stores the menus data in below format.

public class MenuCondiments
{
   public int GroupId { get; set; }
   public string Name { get; set; }
   public long[] CondimentIds { get; set; }
}

e.g.

Now, I want the output data as below in the class by using linq.

public class Condiments
{
   public int GroupId { get; set; }
   public string Name { get; set; }
   public long CondimentIds { get; set; }
}

Can someone assist here?

CodePudding user response：

You can use Linq and SelectMany() to flatten the inner array:

var menuCondiements = // get menucondiments

var result = menuCondiements
               .SelectMany(                // flatten the
                 m => m.CondimentIds       // inner array
                   .Select(
                     c => new Condiment    // project to 
                     {                     // new Condiment() 
                       GroupId = m.GroupId, 
                       Name = m.Name, 
                       CondimentId = c    // here condimentId is 'c'
                     }));

You should also rename your class and Id to singular rather than plural form since the class represents a single object:

public class Condiment
{
   public int GroupId { get; set; }
   public string Name { get; set; }
   public long CondimentId { get; set; }
}

CodePudding user response：

You can try using classic foreach language construct. Below should give you idea.

var menuCondimentList = new System.Collections.Generic.List<MenuCondiments>
{
    new MenuCondiments {GroupId = 21, Name = "Veg Burger", CondimentIds = new long[] { 100032, 100033, 100045, 100056 } },
    new MenuCondiments {GroupId = 22, Name = "Chicken Burger", CondimentIds = new long[] { 100067, 100040, 100034 } }
};

var condimentList = new System.Collections.Generic.List<Condiments>();
// Using foreach
foreach ( var menuCondiment in menuCondimentList )
{
    foreach(var c in menuCondiment.CondimentIds )
    {
        condimentList.Add(new Condiments
        {
            GroupId = menuCondiment.GroupId,
            Name = menuCondiment.Name,
            CondimentId = c
        });
    }
}