Variable.Expression Property

Gets or sets the expression contained in a variable.

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


Public Property Expression As String
Dim instance As Variable
Dim value As String

value = instance.Expression

instance.Expression = value
public string Expression { get; set; }
property String^ Expression {
    String^ get ();
    void set (String^ value);
member Expression : string with get, set
function get Expression () : String
function set Expression (value : String)

Property Value

Type: System.String
A String that contains the expression.


The Expression method returns the expression entered in the value property only when the EvaluateAsExpression property is set to true; otherwise, an empty string is returned if false.


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");
            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")
            Console.WriteLine("Value was not 11")
        End If
End Sub

Sample Output:

Value was 11