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EvaluateAsExpression Propiedad

Gets or sets a Boolean that indicates that the variable contains an expression.

Espacio de nombres:  Microsoft.SqlServer.Dts.Runtime
Ensamblado:  Microsoft.SqlServer.ManagedDTS (en Microsoft.SqlServer.ManagedDTS.dll)

Sintaxis

'Declaración
Public Property EvaluateAsExpression As Boolean
    Get
    Set
'Uso
Dim instance As Variable
Dim value As Boolean

value = instance.EvaluateAsExpression

instance.EvaluateAsExpression = value

public bool EvaluateAsExpression { get; set; }

public:
property bool EvaluateAsExpression {
    bool get ();
    void set (bool value);
}

member EvaluateAsExpression : bool with get, set

function get EvaluateAsExpression () : boolean
function set EvaluateAsExpression (value : boolean)

Valor de la propiedad

Tipo: System. . :: . .Boolean
A Boolean that indicates if the variable contains an expression.

Comentarios

Expressions and variables can be used to control the flow of a package. For more information, see Agregar expresiones a las restricciones de precedencia.

Ejemplos

The following example sets the EvaluateAsExpression flag to show that the variable contains an expression, and then can use the Expression property.

static void Main(string[] args)
    {
        Package p = new Package();
        p.Variables.Add("x", false, "", 1);
        Variable v = p.Variables.Add("y", false, "", 1);
        v.Expression = "@x + 10";
        v.EvaluateAsExpression = true;
        if (v.Value.ToString() == "11")
            Console.WriteLine("Value was 11");
        else
            Console.WriteLine("Value was not 11");
    }

Shared  Sub Main(ByVal args() As String)
        Dim p As Package =  New Package() 
        p.Variables.Add("x", False, "", 1)
        Dim v As Variable =  p.Variables.Add("y",False,"",1) 
        v.Expression = "@x + 10"
        v.EvaluateAsExpression = True
        If v.Value.ToString() = "11" Then
            Console.WriteLine("Value was 11")
        Else 
            Console.WriteLine("Value was not 11")
        End If
End Sub

Sample Output:

Value was 11