Variable.EvaluateAsExpression-Eigenschaft
Gets or sets a Boolean that indicates whether 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)
Eigenschaftswert
Typ: System.Boolean
true if the variable contains an expression; otherwise, false.
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