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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("="); } }

As an example of the SetField<T> operator, shown in Listing 10-16, first I display the sequence of DataRow objects that contain the students. Next, I query one of the students by name from the sequence of DataRow objects and change that name using the SetField<T> operator. I then display the sequence of DataRow objects after the change has been made. Rinse and repeat for each prototype. Listing 10-16. An Example of Each SetField Operator Prototype Student[] students new Student { Id new Student { Id new Student { Id new Student { Id }; = = = = = { 1, Name = "Joe Rattz" }, 7, Name = "Anthony Adams" }, 13, Name = "Stacy Sinclair" }, 72, Name = "Dignan Stephens" }

Console.WriteLine(); } The purpose of the method is to output the header of a DataTable in a tabular form.

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DataTable dt1 = GetDataTable(students); IEnumerable<DataRow> seq1 = dt1.AsEnumerable(); Console.WriteLine("{0}Results before calling any prototype:", System.Environment.NewLine); foreach (DataRow dataRow in seq1) { Console.WriteLine("Student Id = {0} is {1}", dataRow.Field<int>("Id"), dataRow.Field<string>("Name")); } // Using prototype 1. (from s in seq1 where s.Field<string>("Name") == "Anthony Adams" select s).Single<DataRow>().SetField(dt1.Columns[1], "George Oscar Bluth"); Console.WriteLine("{0}Results after calling prototype 1:", System.Environment.NewLine); foreach (DataRow dataRow in seq1) { Console.WriteLine("Student Id = {0} is {1}", dataRow.Field<int>("Id"), dataRow.Field<string>("Name")); } // Using prototype 2. (from s in seq1 where s.Field<string>("Name") == "George Oscar Bluth" select s).Single<DataRow>().SetField("Name", "Michael Bluth"); Console.WriteLine("{0}Results after calling prototype 2:", System.Environment.NewLine);

As you may recall, in the LINQ to Objects API, there are a handful of Standard Query Operators that exist for the purpose of making sequence set-type comparisons. We are referring to the Distinct, Except, Intersect, Union, and SequenceEqual operators. Each of these operators performs a set operation on two sequences. For these set-type operators, determining sequence element equality is necessary to perform the set operation. These operators perform comparisons by calling the GetHashCode and Equals methods on the elements. For a DataRow, this results in a reference comparison, which is not the desired behavior. This will result in the wrong determination of element equality, causing the operators to return unexpected results. Because of this, each of these operators has an additional prototype that we omitted in the LINQ to Objects chapters; this additional prototype allows an IEqualityComparer object to be provided as an argument. Conveniently, a comparer object has been provided for us specifically for these versions of the operators, System.Data.DataRowComparer.Default. This comparer class is in the System.Data namespace in the System.Data.Entity.dll assembly. This comparer determines element equality by comparing the number of columns and the static data type of each column and using the IComparable interface on the column s dynamic data type if that type implements the interface; otherwise, it calls the System.Object s static Equals method. Each of these additional operator prototypes is defined in the System.Linq.Enumerable static class just as the other prototypes of these operators are. In this section, we provide some examples to illustrate the incorrect and, more importantly, correct way to make these sequence comparisons when working with DataSet objects.

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The Distinct operator removes duplicate rows from a sequence of objects. It returns an object that, when enumerated, enumerates a source sequence of objects and returns a sequence of objects with the duplicate rows removed. Typically, this operator determines duplicates by calling each element s data type s GetHashCode and Equals methods. However, for DataRow type objects, this would cause an incorrect result. Because we are going to call the additional prototype and provide the System.Data.DataRowComparerDefault comparer object, the element equality will be properly determined. With it, a row is deemed to be a duplicate by comparing DataRow objects using the number of columns in a row and the static data type of each column and then using the IComparable interface on each column if its dynamic data type implements the IComparable interface, or calling the static Equals method in System.Object if it does not.

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