dataset对XML的操作。writexml() and readxml。dataset.AcceptChanges()。dataset.DIspose()。释放资源

private void DemonstrateReadWriteXMLDocumentWithStreamReader()
{
// Create a DataSet with one table and two columns.
DataSet OriginalDataSet = new DataSet("dataSet");
OriginalDataSet.Namespace= "NetFrameWork";
DataTable table = new DataTable("table");
DataColumn idColumn = new DataColumn("id",
Type.GetType("System.Int32"));
idColumn.AutoIncrement= true;

DataColumn itemColumn = new DataColumn("item");
table.Columns.Add(idColumn);
table.Columns.Add(itemColumn);
OriginalDataSet.Tables.Add(table);

// Add ten rows.
DataRow newRow;
for(int i = 0; i < 10; i++)
{
newRow = table.NewRow();
newRow["item"]= "item " + i;
table.Rows.Add(newRow);
}
OriginalDataSet.AcceptChanges();

// Print out values of each table in the DataSet
// using the function defined below.
PrintValues(OriginalDataSet, "Original DataSet");

// Write the schema and data to an XML file.
string xmlFilename = "XmlDocument.xml";

// Use WriteXml to write the document.
OriginalDataSet.WriteXml(xmlFilename);

// Dispose of the original DataSet.
OriginalDataSet.Dispose();

// Create a new DataSet.
DataSet newDataSet = new DataSet("New DataSet");

// Read the XML document into the DataSet.
newDataSet.ReadXml(xmlFilename);

// Print out values of each table in the DataSet
// using the function defined below.
PrintValues(newDataSet,"New DataSet");
}

private void PrintValues(DataSet dataSet, string label)
{
Console.WriteLine("\n" + label);
foreach(DataTable table in dataSet.Tables)
{
Console.WriteLine("TableName: " + table.TableName);
foreach(DataRow row in table.Rows)
{
foreach(DataColumn column in table.Columns)
{
Console.Write("\table " + row[column] );
}
Console.WriteLine();
}
}
}