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using System; using System.Collections.Generic; using System.Data; public class Parent { public int ParentId { get; set; } public string ParentName { get; set; } public List<Child> Children { get; set; } = new List<Child>(); } public class Child { public int ChildId { get; set; } public string ChildName { get; set; } } public class Example { public static List<Parent> MapToParentChild(DataTable dataTable) { var parents = new Dictionary<int, Parent>(); foreach (DataRow row in dataTable.Rows) { int parentId = Convert.ToInt32(row["ParentId"]); string parentName = row["ParentName"].ToString(); int childId = Convert.ToInt32(row["ChildId"]); string childName = row["ChildName"].ToString(); // Check if the parent already exists if (!parents.ContainsKey(parentId)) { parents[parentId] = new Parent { ParentId = parentId, ParentName = parentName }; } // Add the child to the parent's list parents[parentId].Children.Add(new Child { ChildId = childId, ChildName = childName }); } return new List<Parent>(parents.Values); } }
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