自己手动创建dataset的方法（不用从数据库倒入）
I）首先总体区分一下DataSet、DataTable、DataView:
DataView是一张DataTable的虚拟视图，主要用来显示数据的，其实数据的更改都是发生在DataTable中。如果以数据库来打方，DataSet就是一个功能简单的数据库，是多个表(DataTable)的集 合，DataTable就是对应数据库中的表，而DataView则对应数据库中的视图(View)。
简单说就是：
DataSet：数据集。一般包含多个DataTable，用的时 候，dataset["表名"]得到DataTable
DataTable：数据表。
DataView 表示用于排序、筛选、搜索、编辑和导航的 DataTable 的可绑定数据的自定义视图，是一张DataTable的虚拟视图，主要用来显示数据的。
II）自己手动向DataSet中添加数据其实就是手动向DataTable中添加数据：
一下代码来自MSDN：
// Put the next line into the Declarations section. private System.Data.DataSet dataSet; private void MakeDataTables() { // Run all of the functions. MakeParentTable(); MakeChildTable(); MakeDataRelation(); BindToDataGrid(); } private void MakeParentTable() { // Create a new DataTable. System.Data.DataTable table = new DataTable("ParentTable"); // Declare variables for DataColumn and DataRow objects. DataColumn column; DataRow row; // Create new DataColumn, set DataType, // ColumnName and add to DataTable. column = new DataColumn(); column.DataType = System.Type.GetType("System.Int32"); column.ColumnName = "id"; column.ReadOnly = true;//只读类型 column.Unique = true;//不能重复 // Add the Column to the DataColumnCollection. table.Columns.Add(column);//添加列 // Create second column. column = new DataColumn(); column.DataType = System.Type.GetType("System.String"); column.ColumnName = "ParentItem"; column.AutoIncrement = false; column.Caption = "ParentItem"; column.ReadOnly = false; column.Unique = false; // Add the column to the table. table.Columns.Add(column); // Make the ID column the primary key column. DataColumn[] PrimaryKeyColumns = new DataColumn[1]; PrimaryKeyColumns[0] = table.Columns["id"]; //设置DataTable的主键 table.PrimaryKey = PrimaryKeyColumns; // Instantiate the DataSet variable. dataSet = new DataSet(); // Add the new DataTable to the DataSet. dataSet.Tables.Add(table); // Create three new DataRow objects and add // them to the DataTable for (int i = 0; i<= 2; i++) { row = table.NewRow(); row["id"] = i; row["ParentItem"] = "ParentItem " + i; table.Rows.Add(row); } } private void MakeChildTable() { // Create a new DataTable. DataTable table = new DataTable("childTable"); DataColumn column; DataRow row; // Create first column and add to the DataTable. column = new DataColumn(); column.DataType= System.Type.GetType("System.Int32"); column.ColumnName = "ChildID"; column.AutoIncrement = true;//自动增长 column.Caption = "ID"; column.ReadOnly = true; column.Unique = true; // Add the column to the DataColumnCollection. table.Columns.Add(column); // Create second column. column = new DataColumn(); column.DataType= System.Type.GetType("System.String"); column.ColumnName = "ChildItem"; column.AutoIncrement = false; column.Caption = "ChildItem"; column.ReadOnly = false; column.Unique = false; table.Columns.Add(column); // Create third column. column = new DataColumn(); column.DataType= System.Type.GetType("System.Int32"); column.ColumnName = "ParentID"; column.AutoIncrement = false; column.Caption = "ParentID"; column.ReadOnly = false; column.Unique = false; table.Columns.Add(column); dataSet.Tables.Add(table); // Create three sets of DataRow objects, // five rows each, and add to DataTable. for(int i = 0; i <= 4; i ++) { row = table.NewRow(); row["childID"] = i; row["ChildItem"] = "Item " + i; row["ParentID"] = 0 ; table.Rows.Add(row); } for(int i = 0; i <= 4; i ++) { row = table.NewRow(); row["childID"] = i + 5; row["ChildItem"] = "Item " + i; row["ParentID"] = 1 ; table.Rows.Add(row); } for(int i = 0; i <= 4; i ++) { row = table.NewRow(); row["childID"] = i + 10; row["ChildItem"] = "Item " + i; row["ParentID"] = 2 ; table.Rows.Add(row); } } private void MakeDataRelation() { // DataRelation requires two DataColumn // (parent and child) and a name. DataColumn parentColumn = dataSet.Tables["ParentTable"].Columns["id"]; DataColumn childColumn = dataSet.Tables["ChildTable"].Columns["ParentID"]; DataRelation relation = new DataRelation("parent2Child", parentColumn, childColumn); //添加DataRelation dataSet.Tables["ChildTable"].ParentRelations.Add(relation); } private void BindToDataGrid() { // Instruct the DataGrid to bind to the DataSet, with the // ParentTable as the topmost DataTable. dataGrid1.SetDataBinding(dataSet,"ParentTable"); }