C＃相当于Delphi的DisableControls / EnableControls

Question

What is the C# equivalent of Delphi's DisableControls / EnableControls methods (used to disable updating of databound controls while iterating through the underlying dataset)? I have googled for half an hour and did not find an answer...

I have a list box and a rich edit box bound to a binding source, but I need to do an operation that iterates through the entire dataset, and both controls get updated as I move through the underlying dataset. In Delphi this is easy enough: enclose the block that does the iteration between DisableControls and EnableControls . I can't find the C#/.NET equivalent, and I have looked really hard!

Answer 1

IIRC, setting Enabled to false does not prevent the controls from reacting to data changes in WinForms.

Collection-bound controls like the ListBox typically have methods BeginUpdate() and EndUpdate() which temporarily disable visual updates.

Also, the property mentioned by DarkSquirrel might be worth a look

Answer 2

I don't have access to Visual Studio right now, so I can't test this, but look through the methods for the control instance. Code such as:

// set the Enabled property of 
// the controls to False; this should
// disable the controls for user access

listBox.Enabled = False;  
richEditBox.Enabled = False;  

// perform iteration  
// and other operations

// set the Enabled property back 
// to True  

listBox.Enabled = True;  
richEditBox.Enabled = True;  

The exact name of the property may differ slightly, but I'm pretty sure that this is what it is.

Answer 3

到目前为止，我知道，你不需要在C＃中使用Disiable / EnableControls，因为这种类型的DataSet不适用于当前游标，如Delphi TDataSets。

Answer 4

I assume you are using WinForms, in that case you can try using the methods SuspendLayout / ResumeLayout .

Code sample from MSDN:

private void AddButtons()
{
   // Suspend the form layout and add two buttons.
   this.SuspendLayout();
   Button buttonOK = new Button();
   buttonOK.Location = new Point(10, 10);
   buttonOK.Size = new Size(75, 25);
   buttonOK.Text = "OK";

   Button buttonCancel = new Button();
   buttonCancel.Location = new Point(90, 10);
   buttonCancel.Size = new Size(75, 25);
   buttonCancel.Text = "Cancel";

   this.Controls.AddRange(new Control[]{buttonOK, buttonCancel});
   this.ResumeLayout();
}