FlexReport for WPF | ComponentOne
C1.WPF.FlexReport.4.6.2 Assembly / C1.WPF.FlexReport Namespace / C1FlexReport Class / Evaluate Method / Evaluate(String) Method
A string with a VBScript expression to be evaluated.
Example

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    Evaluate(String) Method
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    Evaluates a VBScript expression in the current report context.
    Syntax
    'Declaration
     
    Public Overloads Function Evaluate( _
       ByVal expression As String _
    ) As Object
    public object Evaluate( 
       string expression
    )

    Parameters

    expression
    A string with a VBScript expression to be evaluated.

    Return Value

    The value of the expression.
    Remarks

    Use this method to evaluate expressions as they would be evaluated while generating a report. This can be useful in designer-type applications, to provide an "Immediate Window" where users can test expressions.

    If the expression string contains invalid syntax or causes an evaluation error, the control raises the ReportError event. In this case, the Handled parameter of the event is set to true, so the exception is ignored by default.

    Example

    Expressions may contain simple VBScript expressions such as:

    Expressions may also contain references to the Report object and all its sub-objects. For example:

    Finally, data fields, Field, and Section objects may be referenced directly by name.

    Console.WriteLine(_c1r.Evaluate("2+2"));
      4
    Console.WriteLine(_c1r.Evaluate(" \"A\" & \"B\" ");
      AB
    Console.WriteLine(_c1r.Evaluate("Report.DataSource.RecordSource"));
      SELECT * FROM Employees
    Console.WriteLine(_c1r.Evaluate("Report.DataSource.Recordset.Fields.Count"));
      7
    Console.WriteLine(_c1r.Evaluate("Report.Fields(0).Name"));
      FirstNameField
    Console.WriteLine(_c1r.Evaluate("FirstNameField.Value"));
      Andrew
    Console.WriteLine(_c1r.Evaluate("CategoryName"));
      Beverages
    See Also