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DataGridTextBoxColumn.GetPreferredHeight(Graphics, Object) Metodo

  • Riferimento

Definizione

Spazio dei nomi:
System.Windows.Forms
Assembly:
System.Windows.Forms.dll

Ottiene l'altezza da utilizzare per il ridimensionamento automatico delle colonne.

protected public:
 override int GetPreferredHeight(System::Drawing::Graphics ^ g, System::Object ^ value);
protected internal override int GetPreferredHeight (System.Drawing.Graphics g, object value);
override this.GetPreferredHeight : System.Drawing.Graphics * obj -> int
Protected Friend Overrides Function GetPreferredHeight (g As Graphics, value As Object) As Integer

Parametri

g
Graphics

Oggetto Graphics utilizzato per disegnare forme sullo schermo.

value
Object

Valore da disegnare.

Restituisce

Int32

Altezza in base alla quale vengono automaticamente ridimensionate le celle.

Esempio

Nell'esempio seguente viene usato l'oggetto GetPreferredHeight per restituire l'altezza a cui viene ridimensionata automaticamente una colonna.

public ref class MyGridColumn: public DataGridTextBoxColumn
{
public:
   int GetPrefHeight( Graphics^ g, String^ val )
   {
      return this->GetPreferredHeight( g, val );
   }

};

public ref class Form1: public Form
{
protected:
   DataGrid^ dataGrid1;

private:
   void GetPreferredHeight()
   {
      Graphics^ g;
      g = this->CreateGraphics();
      int gridPreferredHeight;
      MyGridColumn^ myTextColumn;
      
      // Assuming column 1 of a DataGrid control is a 
      // DataGridTextBoxColumn.
      myTextColumn = dynamic_cast<MyGridColumn^>(dataGrid1->TableStyles[ 0 ]->GridColumnStyles[ 1 ]);
      String^ myVal;
      myVal = "A long string value";
      gridPreferredHeight = myTextColumn->GetPrefHeight( g, myVal );
      Console::WriteLine( gridPreferredHeight );
   }

};

public class Form1: Form
{
 protected DataGrid dataGrid1;

private void GetPreferredHeight(){
   Graphics g;
   g = this.CreateGraphics();
   int gridPreferredHeight;
   MyGridColumn myTextColumn;
    // Assuming column 1 of a DataGrid control is a 
    // DataGridTextBoxColumn.
   myTextColumn = (MyGridColumn)
   dataGrid1.TableStyles[0].GridColumnStyles[1];
   string myVal;
   myVal = "A long string value";
   gridPreferredHeight= myTextColumn.GetPrefHeight(g, myVal);
   Console.WriteLine(gridPreferredHeight);
   }
}

public class MyGridColumn:DataGridTextBoxColumn{
   public int GetPrefHeight(Graphics g, string val){
      return this.GetPreferredHeight(g, val);
   }
}

Public Class Form1
   Inherits Form
   Protected dataGrid1 As DataGrid
    
   Private Sub GetPreferredHeight()
      Dim g As Graphics
      g = Me.CreateGraphics()
      Dim gridPreferredHeight As Integer
      Dim myTextColumn As MyGridColumn
      ' Assuming column 1 of a DataGrid control is a 
      ' DataGridTextBoxColumn.
      myTextColumn = CType(dataGrid1.TableStyles(0). _
      GridColumnStyles(1), MyGridColumn)
      Dim myVal As String
      myVal = "A long string value"
      gridPreferredHeight = myTextColumn.GetPrefHeight _
      (g, myVal)
      Console.WriteLine(gridPreferredHeight)
   End Sub 
End Class 

Public Class MyGridColumn
Inherits DataGridTextBoxColumn
   public Function GetPrefHeight(g As Graphics , val As string) _
   As Integer
      return me.GetPreferredHeight(g, val)
   End Function
End Class

Si applica a

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