Proprietà Variable.EvaluateAsExpression
Gets or sets a Boolean that indicates whether the variable contains an expression.
Spazio dei nomi Microsoft.SqlServer.Dts.Runtime
Assembly: Microsoft.SqlServer.ManagedDTS (in Microsoft.SqlServer.ManagedDTS.dll)
Sintassi
'Dichiarazione
Public Property EvaluateAsExpression As Boolean
Get
Set
'Utilizzo
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)
Valore proprietà
Tipo: System.Boolean
true if the variable contains an expression; otherwise, false.
Osservazioni
Expressions and variables can be used to control the flow of a package. For more information, see Aggiunta di espressioni ai vincoli di precedenza.
Esempi
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