Csharp/C Sharp by API/System.Data/DataRow

Материал из .Net Framework эксперт
Версия от 15:12, 26 мая 2010; Admin (обсуждение | вклад) (1 версия)
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DataRow.RowState

<source lang="csharp">

using System; using System.Drawing; using System.Collections; using System.ruponentModel; using System.Windows.Forms; using System.Data; using System.Data.rumon; public class DataRowUpdateState : System.Windows.Forms.Form {

 private System.Windows.Forms.DataGrid dataGrid1;
 private System.ruponentModel.Container components = null;
 public DataRowUpdateState()
 {
   InitializeComponent();
   CreateCustomersTable();
 }
 protected override void Dispose( bool disposing )
 {
   if( disposing )
   {
     if (components != null) 
     {
       components.Dispose();
     }
   }
   base.Dispose( disposing );
 }
 private void InitializeComponent()
 {
   this.dataGrid1 = new System.Windows.Forms.DataGrid();
   ((System.ruponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
   this.SuspendLayout();
   // 
   // dataGrid1
   // 
   this.dataGrid1.DataMember = "";
   this.dataGrid1.Location = new System.Drawing.Point(8, 8);
   this.dataGrid1.Name = "dataGrid1";
   this.dataGrid1.Size = new System.Drawing.Size(416, 296);
   this.dataGrid1.TabIndex = 0;
   // 
   // DataRowUpdateState
   // 
   this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
   this.ClientSize = new System.Drawing.Size(432, 309);
   this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                   this.dataGrid1});
   this.Name = "DataRowUpdateState";
   this.Text = "DataRowUpdateState";
   ((System.ruponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
   this.ResumeLayout(false);
 }
 [STAThread]
 static void Main() 
 {
   Application.Run(new DataRowUpdateState());
 }
 private void CreateCustomersTable()
 {
   System.Data.DataTable custTable = new DataTable("Customers");
   DataColumn dtColumn;
   
   dtColumn = new DataColumn();
   dtColumn.DataType = System.Type.GetType("System.Int32");
   dtColumn.ColumnName = "id";
   dtColumn.Caption = "Cust ID";
   dtColumn.ReadOnly = true;
   dtColumn.Unique = true;
   custTable.Columns.Add(dtColumn);
   dtColumn = new DataColumn();
   dtColumn.DataType = System.Type.GetType("System.String");
   dtColumn.ColumnName = "Name";
   dtColumn.Caption = "Cust Name";
   dtColumn.AutoIncrement = false;
   dtColumn.ReadOnly = false;
   dtColumn.Unique = false;
   custTable.Columns.Add(dtColumn);
   dtColumn = new DataColumn();
   dtColumn.DataType = System.Type.GetType("System.String");
   dtColumn.ColumnName = "Address";
   dtColumn.Caption = "Address";
   dtColumn.ReadOnly = false;
   dtColumn.Unique = false;
   // Add Address column to the table.
   custTable.Columns.Add(dtColumn);
   DataColumn[] PrimaryKeyColumns = new DataColumn[1];
   PrimaryKeyColumns[0] = custTable.Columns["id"];
   custTable.PrimaryKey = PrimaryKeyColumns;
   DataSet ds = new DataSet("Customers");
   ds.Tables.Add(custTable);
   DataRow row1 = custTable.NewRow();
   row1["id"] = 1;
   row1["Address"] = "USA";
   row1["Name"] = "George";
   custTable.Rows.Add(row1);
       MessageBox.Show(row1.RowState.ToString());
   row1.RejectChanges();
   MessageBox.Show(row1.RowState.ToString());
   row1.Delete();
   MessageBox.Show(row1.RowState.ToString());
   
   dataGrid1.DataSource = ds.DefaultViewManager;      
 }

}

 </source>