ADO.NET 2.0 Dataset和Datatable 新功能新特性-优快云博客

本文介绍.NET Framework 2005中DataSet性能提升，包括索引引擎的优化，将Dataset序列化为二进制文件的方法，以及如何更独立地使用DataTable进行读写操作。

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1.新的索引引擎更快的执行效率
下面这段代码在2003中需要157秒，在2005中只要11秒就可以完成：

DataSet ds = new DataSet();

            ds.Tables.Add("BigTable");
            ds.Tables[0].Columns.Add("ID", Type.GetType("System.Int32"));
            ds.Tables[0].Columns["ID"].Unique = true;
            ds.Tables[0].Columns.Add("Value", Type.GetType("System.Int32"));

Cursor.Current = Cursors.WaitCursor;

DateTime datBegin = DateTime.Now;

            Random rand = new Random();
            int i, intValue;
            DataRow dr;

            for (i = 1; i <= 500000; i++)
            {
                try
                {
                    intValue = rand.Next();

dr = ds.Tables[0].NewRow();

dr["ID"] = intValue;
dr["Value"] = intValue;

                    ds.Tables[0].Rows.Add(dr);
                }
                catch { }
            }

Cursor.Current = Cursors.Default;

MessageBox.Show("Elapsed Time: " + (DateTime.Now - datBegin).Seconds.ToString());
MessageBox.Show("count = " + ds.Tables[0].Rows.Count.ToString());
2.Dataset可以序列化为二进制文件
string connstr = "server=(local);database=northwind;integrated security=true;async=true";

            DataSet ds = new DataSet();
            SqlDataAdapter dadpt = new SqlDataAdapter("select * from [order details]", connstr);
            dadpt.Fill(ds);

BinaryFormatter bf = new BinaryFormatter();
FileStream fs = new FileStream(@"c:/xml1.txt",FileMode.OpenOrCreate);

ds.RemotingFormat = SerializationFormat.Binary;

            bf.Serialize(fs,ds);     3.更独立的Datatable
DataTable Write XML string connstr = "server=(local);database=northwind;integrated security=true;async=true";
            SqlDataAdapter dadpt = new SqlDataAdapter("select * from [order details]", connstr);
            DataTable dt = new DataTable("Customer");
            dadpt.Fill(dt);

dt.WriteXml(@"c:/DataTable.xml",true);
dt.WriteXmlSchema(@"c:/DataTableSchema.xml"); DataTable Read XML
StreamReader sr = new StreamReader(@"C:/DataTableSchema.xml");

DataTable dt = new DataTable();
dt.ReadXmlSchema(sr);

dt.ReadXml(new StreamReader(@"c:/dataTable.xml"));

            this.dataGridView1.DataSource = dt;    DataTable Merge
string connstr = "server=(local);database=northwind;integrated security=true;async=true";
            SqlDataAdapter dadpt = new SqlDataAdapter("select * from customers", connstr);
            DataTable dt = new DataTable("Customer");
            dadpt.Fill(dt);

            SqlDataAdapter dadpt1 = new SqlDataAdapter("select * from customers", connstr);
            DataTable dt1 = new DataTable("Customer1");
            dadpt1.Fill(dt1);

dt.Merge(dt1);

            this.dataGridView1.DataSource = dt; DataTable Load DataReader
string connstr = "server=(local);database=northwind;integrated security=true;async=true";
            SqlConnection conn = new SqlConnection(connstr);
            conn.Open();
            SqlCommand cmd = new SqlCommand("select * from [order details]", conn);
            SqlDataReader dr = cmd.ExecuteReader();

DataTable dt = new DataTable("Customer");
dt.Load(dr);

this.dataGridView1.DataSource = dt;