Null Property

Occurs when you specify an intersection of two intersections that do not intersect.

Syntax

Visual Basic
C#

'Declaration
 
Public Shared ReadOnly Property Null As CalcError

'Usage
 
Dim value As CalcError
 
value = CalcError.Null

public static CalcError Null {get;}

Property Value

CalcError object containing this type of error

Example

This example returns the error value.

//Spread for Windows Forms
FarPoint.CalcEngine.ErrorExpression err = new FarPoint.CalcEngine.ErrorExpression(FarPoint.CalcEngine.CalcError.Null);
fpSpread1.ActiveSheet.AddCustomName("Alpha", err);
fpSpread1.ActiveSheet.SetFormula(0, 0, "Alpha * 10");
FarPoint.CalcEngine.Expression expr = fpSpread1.ActiveSheet.GetCustomName("Alpha"); 
if (expr is FarPoint.CalcEngine.ErrorExpression) 
{ 
FarPoint.CalcEngine.ErrorExpression ex = ((FarPoint.CalcEngine.ErrorExpression)(expr)); 
MessageBox.Show("The error is " + ex.ErrorValue.ToString()); 
}
//Spread for Web Forms
FarPoint.CalcEngine.ErrorExpression err = new FarPoint.CalcEngine.ErrorExpression(FarPoint.CalcEngine.CalcError.Null);
FarPoint.Web.Spread.Model.DefaultSheetDataModel dataModel = new FarPoint.Web.Spread.Model.DefaultSheetDataModel();  
dataModel = (FarPoint.Web.Spread.Model.DefaultSheetDataModel)FpSpread1.ActiveSheetView.DataModel;
dataModel.AddCustomName("Alpha", err);
FpSpread1.Sheets[0].SetFormula(0, 0, "Alpha * 10");
FarPoint.CalcEngine.Expression expr = dataModel.GetCustomName("Alpha"); 
if (expr is FarPoint.CalcEngine.ErrorExpression) 
{ 
FarPoint.CalcEngine.ErrorExpression ex = ((FarPoint.CalcEngine.ErrorExpression)(expr)); 
TextBox1.Text = "The error is " + ex.ErrorValue.ToString(); 
}

Visual Basic

'Spread for Windows Forms
Dim err As New FarPoint.CalcEngine.ErrorExpression(FarPoint.CalcEngine.CalcError.Null)
FpSpread1.ActiveSheet.AddCustomName("Alpha", err)
FpSpread1.ActiveSheet.SetFormula(0, 0, "Alpha")
Dim expr As FarPoint.CalcEngine.Expression = FpSpread1.ActiveSheet.GetCustomName("Alpha")
If TypeOf expr Is FarPoint.CalcEngine.ErrorExpression Then
Dim ex As FarPoint.CalcEngine.ErrorExpression = CType(expr, FarPoint.CalcEngine.ErrorExpression)
MessageBox.Show("The error is " & ex.ErrorValue.ToString())
End If
'Spread for Web Forms
Dim err As New FarPoint.CalcEngine.ErrorExpression(FarPoint.CalcEngine.CalcError.Null)
Dim dataModel As New FarPoint.Web.Spread.Model.DefaultSheetDataModel
dataModel = FpSpread1.ActiveSheetView.DataModel
dataModel.AddCustomName("Alpha", err)
FpSpread1.Sheets(0).SetFormula(0, 0, "Alpha")
Dim expr As FarPoint.CalcEngine.Expression = dataModel.GetCustomName("Alpha")
If TypeOf expr Is FarPoint.CalcEngine.ErrorExpression Then
Dim ex As FarPoint.CalcEngine.ErrorExpression = CType(expr, FarPoint.CalcEngine.ErrorExpression)
TextBox1.Text = "The error is " & ex.ErrorValue.ToString()
End If

Requirements

Target Platforms: Windows 7, Windows 8, Windows 10, Windows Vista, Windows Server 2003, Windows Server 2008, Windows Server 2012, Windows XP Professional

Reference

CalcError Class
CalcError Members