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EvaluateAsExpression-Eigenschaft

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

Namespace:  Microsoft.SqlServer.Dts.Runtime
Assembly:  Microsoft.SqlServer.ManagedDTS (in Microsoft.SqlServer.ManagedDTS.dll)

Syntax

'Declaration
Public Property EvaluateAsExpression As Boolean
    Get
    Set
'Usage
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)

Eigenschaftenwert

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

Hinweise

Expressions and variables can be used to control the flow of a package. For more information, see Hinzufügen von Ausdrücken zu Rangfolgeneinschränkungen.

Beispiele

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