Variable.Expression Variable.Expression Variable.Expression Property


Gets or sets the expression contained in a variable.

 property System::String ^ Expression { System::String ^ get(); void set(System::String ^ value); };
[Microsoft.SqlServer.Dts.Runtime.Localization.LocalizablePropertyDescription(typeof(Microsoft.SqlServer.Dts.Runtime.Localized), "ExpressionDesc")]
public string Expression { get; set; }
Public Property Expression As String
Property Value

A String that contains the expression.


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


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.

Applies to