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");
}