Variable.EvaluateAsExpression Property

Reference

Definition

Namespace:: Microsoft.SqlServer.Dts.Runtime

Assembly:: Microsoft.SqlServer.ManagedDTS.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets or sets a Boolean that indicates whether the variable contains an expression.

public:
 property bool EvaluateAsExpression { bool get(); void set(bool value); };

[Microsoft.SqlServer.Dts.Runtime.Localization.LocalizablePropertyDescription(typeof(Microsoft.SqlServer.Dts.Runtime.Localized), "EvaluateAsExpressionDesc")]
public bool EvaluateAsExpression { get; set; }

[<Microsoft.SqlServer.Dts.Runtime.Localization.LocalizablePropertyDescription(typeof(Microsoft.SqlServer.Dts.Runtime.Localized), "EvaluateAsExpressionDesc")>]
member this.EvaluateAsExpression : bool with get, set

Public Property EvaluateAsExpression As Boolean

Property Value

Boolean

true if the variable contains an expression; otherwise, false.

Attributes: LocalizablePropertyDescriptionAttribute

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

Expressions and variables can be used to control the flow of a package. For more information, see Add Expressions to Precedence Constraints.

Applies to

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