The Intersect operator produces a sequence of DataRow objects that is the intersection of two sequences of DataRow objects.
public static IEnumerable<T> Intersect<T> ( this IEnumerable<T> first, IEnumerable<T> second, IEqualityComparer<T> comparer);
The Intersect Operator with and Without the Comparer Object
using System; using System.Linq; using System.Collections; using System.Collections.Generic; using System.Data; class Program/*from w ww . j a va 2s. c o m*/ { static void Main(string[] args) { Student[] students = { new Student { Id = 1, Name = "Joe Ruby" }, new Student { Id = 7, Name = "Apache Python" }, new Student { Id = 13, Name = "Scala Sinclair" }, new Student { Id = 72, Name = "Django SQL" } }; Student[] students2 = { new Student { Id = 5, Name = "Abe Html" }, new Student { Id = 7, Name = "Apache Python" }, new Student { Id = 29, Name = "Future Man" }, new Student { Id = 72, Name = "Django SQL" } }; DataTable dt1 = GetDataTable(students); IEnumerable<DataRow> seq1 = dt1.AsEnumerable(); DataTable dt2 = GetDataTable(students2); IEnumerable<DataRow> seq2 = dt2.AsEnumerable(); IEnumerable<DataRow> intersect = seq1.Intersect(seq2, System.Data.DataRowComparer.Default); Console.WriteLine("{0}Results of Intersect() with comparer{0}", System.Environment.NewLine); OutputDataTableHeader(dt1, 15); foreach (DataRow dataRow in intersect) { Console.WriteLine("{0,-15}{1,-15}", dataRow.Field<int>(0), dataRow.Field<string>(1)); } intersect = seq1.Intersect(seq2); Console.WriteLine("{0}Results of Intersect() without comparer{0}", System.Environment.NewLine); OutputDataTableHeader(dt1, 15); foreach (DataRow dataRow in intersect) { Console.WriteLine("{0,-15}{1,-15}", dataRow.Field<int>(0), dataRow.Field<string>(1)); } } static void OutputDataTableHeader(DataTable dt, int columnWidth) { string format = string.Format("{0}0,-{1}{2}", "{", columnWidth, "}"); // Display the column headings. foreach (DataColumn column in dt.Columns) { Console.Write(format, column.ColumnName); } Console.WriteLine(); foreach (DataColumn column in dt.Columns) { for (int i = 0; i < columnWidth; i++) { Console.Write("="); } } Console.WriteLine(); } static DataTable GetDataTable(Student[] students) { DataTable table = new DataTable(); table.Columns.Add("Id", typeof(Int32)); table.Columns.Add("Name", typeof(string)); foreach (Student student in students) { table.Rows.Add(student.Id, student.Name); } return (table); } } class Student { public int Id; public string Name; }