Variable.Expression Variable.Expression Variable.Expression Property

Definition

Gets or sets the expression contained in a variable.

public:
 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.

Examples

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

Remarks

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