NonBlocking Property

In This Topic

Gets or sets data request mode.

Syntax

Visual Basic
C#

'Declaration
 
Public Property NonBlocking As Boolean

public bool NonBlocking {get; set;}

Property Value

If this property is true, true, and the FetchAll property is true also, the data is requested asynchronously.

Remarks

When FetchAll property is false, the NonBlocking property is ignored. When both FetchAll and NonBlocking properties are true, the fill operation is performed asynchronously, and you can use SuspendFill, EndFill, and other asynchronous methods.

Example

The following example demonstrates how to use the NonBlocking property.

csharp

static void UseDataTable(DbDataTable myDataTable, DbConnection myConnection) {

  myDataTable.Connection = myConnection;
  myDataTable.SelectCommand = myConnection.CreateCommand();
  myDataTable.SelectCommand.CommandText = "SELECT * FROM Dept";
  myDataTable.NonBlocking = true;
  myDataTable.Active = true;
  
  while ( true ) {
    Thread.Sleep(100);
    bool isFetching = !System.Threading.Monitor.TryEnter(myDataTable.SyncRoot, 0);
    if (!isFetching)
      System.Threading.Monitor.Exit(myDataTable.SyncRoot);
    else
      break;
    Console.Write("Fetch in process");
  }
  Console.Write("All records are fetched");
}

Visual Basic

Private Shared Sub UseDataTable(ByVal myDataTable As DbDataTable, ByVal myConnection As DbConnection)
  myDataTable.Connection = myConnection
  myDataTable.SelectCommand = myConnection.CreateCommand
  myDataTable.SelectCommand.CommandText = "SELECT * FROM Dept"
  myDataTable.NonBlocking = True
  myDataTable.Active = True
  Do While True
    Thread.Sleep(100)
    If Not Monitor.TryEnter(myDataTable.SyncRoot, 0) Then
      Console.Write("All records are fetched")
      Return
    End If
    Monitor.Exit(myDataTable.SyncRoot)
    Console.Write("Fetch in process")
  Loop
End Sub

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

DbDataTable Class
DbDataTable Members
FetchAll Property
SuspendFill Method
EndFill Method

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