Csharp/CSharp Tutorial/ADO.Net/DataView
Содержание
Attach DataViews to two separate DataGrid controls
<source lang="csharp">using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Data.SqlClient; public class MainClass : System.Windows.Forms.Form {
private System.Windows.Forms.DataGrid dataGrid1;
private System.Windows.Forms.DataGrid dataGrid2;
public MainClass()
{
InitializeComponent();
string ConnectionString ="Integrated Security=SSPI;Initial Catalog=Northwind;Data Source=localhost;";
SqlConnection conn = new SqlConnection(ConnectionString);
conn.Open();
DataSet ds = new DataSet("Orders");
SqlDataAdapter adapter = new SqlDataAdapter("SELECT * FROM Orders", conn);
adapter.Fill(ds, "Orders");
DataView dataView1 = new DataView(ds.Tables["Orders"]);
dataView1.Sort = "ShippedDate ASC";
DataView dataView2 = new DataView(ds.Tables["Orders"]);
dataView2.Sort = "EmployeeID ASC";
dataGrid1.DataSource = dataView1;
dataGrid2.DataSource = dataView2;
}
private void InitializeComponent()
{
this.dataGrid1 = new System.Windows.Forms.DataGrid();
this.dataGrid2 = new System.Windows.Forms.DataGrid();
((System.ruponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
((System.ruponentModel.ISupportInitialize)(this.dataGrid2)).BeginInit();
this.SuspendLayout();
//
// dataGrid1
//
this.dataGrid1.DataMember = "";
this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
this.dataGrid1.Location = new System.Drawing.Point(8, 8);
this.dataGrid1.Size = new System.Drawing.Size(272, 248);
//
// dataGrid2
//
this.dataGrid2.DataMember = "";
this.dataGrid2.HeaderForeColor = System.Drawing.SystemColors.ControlText;
this.dataGrid2.Location = new System.Drawing.Point(288, 8);
this.dataGrid2.Size = new System.Drawing.Size(312, 256);
//
// MainClass
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(600, 273);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.dataGrid2,
this.dataGrid1});
((System.ruponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
((System.ruponentModel.ISupportInitialize)(this.dataGrid2)).EndInit();
this.ResumeLayout(false);
}
[STAThread]
static void Main()
{
Application.Run(new MainClass());
}
}</source>
Create DataViews from DataTable
<source lang="csharp">using System; using System.Data; using System.Data.SqlClient; class MainClass {
static void Main(string[] args)
{
string connString = @"server = .\sqlexpress;integrated security = true;database = northwind";
string sql = @"select contactname, country from customers";
SqlConnection conn = new SqlConnection(connString);
try
{
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = new SqlCommand(sql, conn);
DataSet ds = new DataSet();
da.Fill(ds, "customers");
DataTable dt = ds.Tables["customers"];
DataView dv = new DataView(dt,"country = "Germany"","country",DataViewRowState.CurrentRows);
foreach (DataRowView drv in dv)
{
for (int i = 0; i < dv.Table.Columns.Count; i++)
Console.WriteLine(drv[i]);
}
}
catch(Exception e)
{
Console.WriteLine("Error: " + e);
}
finally
{
conn.Close();
}
}
}</source>
DataView Sorter and Filter
<source lang="csharp">using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Data.OleDb; using System.Data.SqlClient; public class DataViewManagerDemo : System.Windows.Forms.Form {
private System.Windows.Forms.DataGrid dataGrid1;
public DataViewManagerDemo()
{
InitializeComponent();
}
private void InitializeComponent()
{
this.dataGrid1 = new System.Windows.Forms.DataGrid();
((System.ruponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
this.SuspendLayout();
//
this.dataGrid1.DataMember = "";
this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
this.dataGrid1.Location = new System.Drawing.Point(8, 8);
this.dataGrid1.Size = new System.Drawing.Size(448, 328);
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(480, 341);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.dataGrid1});
this.Load += new System.EventHandler(this.DataViewManagerDemo_Load);
((System.ruponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
this.ResumeLayout(false);
}
[STAThread]
static void Main()
{
Application.Run(new DataViewManagerDemo());
}
private void DataViewManagerDemo_Load(object sender, System.EventArgs e)
{
string ConnectionString ="Integrated Security=SSPI;Initial Catalog=Northwind;Data Source=localhost;";
SqlConnection conn = new SqlConnection(ConnectionString);
conn.Open();
DataSet ds = new DataSet("Orders");
SqlDataAdapter adapter = new SqlDataAdapter("SELECT * FROM Orders", conn);
adapter.Fill(ds, "Orders");
DataViewManager dvm = new DataViewManager(ds);
dvm.DataViewSettings["Orders"].RowFilter = "EmployeeID = 4";
dvm.DataViewSettings["Orders"].Sort = "ShippedDate ASC";
DataView dataView1 = dvm.CreateDataView(ds.Tables["Orders"]);
dataGrid1.DataSource = dataView1;
}
}</source>
Loop through DataRowView in DataView
<source lang="csharp">using System; using System.Data; using System.Data.SqlClient; class MainClass {
static void Main(string[] args)
{
string connString = @"server = .\sqlexpress;integrated security = true;database = northwind";
string sql = @"select contactname, country from customers";
SqlConnection conn = new SqlConnection(connString);
try
{
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = new SqlCommand(sql, conn);
DataSet ds = new DataSet();
da.Fill(ds, "customers");
DataTable dt = ds.Tables["customers"];
DataView dv = new DataView(dt,"country = "Germany"","country",DataViewRowState.CurrentRows);
foreach (DataRowView drv in dv)
{
for (int i = 0; i < dv.Table.Columns.Count; i++)
Console.WriteLine(drv[i]);
}
}
catch(Exception e)
{
Console.WriteLine("Error: " + e);
}
finally
{
conn.Close();
}
}
}</source>
Multiple Data View
<source lang="csharp">using System.Data.SqlClient; using System.Data; using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms;
public class MultipleView : System.Windows.Forms.Form
{
private System.Windows.Forms.DataGrid gridArgentina;
private System.Windows.Forms.DataGrid gridBrazil;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.DataGrid gridAll;
public MultipleView()
{
this.gridArgentina = new System.Windows.Forms.DataGrid();
this.gridBrazil = new System.Windows.Forms.DataGrid();
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.label3 = new System.Windows.Forms.Label();
this.gridAll = new System.Windows.Forms.DataGrid();
((System.ruponentModel.ISupportInitialize)(this.gridArgentina)).BeginInit();
((System.ruponentModel.ISupportInitialize)(this.gridBrazil)).BeginInit();
((System.ruponentModel.ISupportInitialize)(this.gridAll)).BeginInit();
this.SuspendLayout();
//
// gridArgentina
//
this.gridArgentina.DataMember = "";
this.gridArgentina.Location = new System.Drawing.Point(12, 32);
this.gridArgentina.Size = new System.Drawing.Size(416, 88);
this.gridArgentina.TabIndex = 0;
//
// gridBrazil
//
this.gridBrazil.DataMember = "";
this.gridBrazil.Location = new System.Drawing.Point(12, 156);
this.gridBrazil.Size = new System.Drawing.Size(416, 96);
this.gridBrazil.TabIndex = 1;
//
// label1
//
this.label1.Location = new System.Drawing.Point(12, 12);
this.label1.Size = new System.Drawing.Size(156, 16);
this.label1.Text = "Customers From Argentina:";
//
// label2
//
this.label2.Location = new System.Drawing.Point(12, 136);
this.label2.Size = new System.Drawing.Size(156, 16);
this.label2.Text = "Customers From Brazil:";
//
// label3
//
this.label3.Location = new System.Drawing.Point(12, 268);
this.label3.Size = new System.Drawing.Size(156, 16);
this.label3.Text = "All Customers:";
//
// gridAll
//
this.gridAll.DataMember = "";
this.gridAll.Location = new System.Drawing.Point(12, 288);
this.gridAll.Size = new System.Drawing.Size(416, 96);
//
// MultipleView
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
this.ClientSize = new System.Drawing.Size(440, 398);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.gridAll,
this.label3,
this.label2,
this.label1,
this.gridBrazil,
this.gridArgentina});
this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.Text = "Multiple Views";
this.Load += new System.EventHandler(this.MultipleView_Load);
((System.ruponentModel.ISupportInitialize)(this.gridArgentina)).EndInit();
((System.ruponentModel.ISupportInitialize)(this.gridBrazil)).EndInit();
((System.ruponentModel.ISupportInitialize)(this.gridAll)).EndInit();
this.ResumeLayout(false);
}
private void MultipleView_Load(object sender, System.EventArgs e)
{
string connectionString = "Data Source=localhost;Initial Catalog=Northwind;Integrated Security=SSPI";
string SQL = "SELECT * FROM Customers";
SqlConnection con = new SqlConnection(connectionString);
SqlCommand com = new SqlCommand(SQL, con);
SqlDataAdapter adapter = new SqlDataAdapter(com);
DataSet ds = new DataSet("Northwind");
con.Open();
adapter.Fill(ds, "Customers");
con.Close();
DataView viewArgentina = new DataView(ds.Tables["Customers"]);
DataView viewBrazil = new DataView(ds.Tables["Customers"]);
viewArgentina.RowFilter = "Country = "Argentina"";
viewBrazil.RowFilter = "Country = "Brazil"";
gridArgentina.DataSource = viewArgentina;
gridBrazil.DataSource = viewBrazil;
gridAll.DataSource = ds.Tables["Customers"].DefaultView;
}
[STAThread]
static void Main()
{
Application.Run(new MultipleView());
}
}</source>
