Switch<T>.Expression Property

Definition

Namespace:

System.Activities.Statements

Assembly:

System.Activities.dll

Gets the object to compare to the keys in the Cases collection.

public:
 property System::Activities::InArgument<T> ^ Expression { System::Activities::InArgument<T> ^ get(); void set(System::Activities::InArgument<T> ^ value); };

[System.Activities.RequiredArgument]
public System.Activities.InArgument<T> Expression { get; set; }

[<System.Activities.RequiredArgument>]
member this.Expression : System.Activities.InArgument<'T> with get, set

Public Property Expression As InArgument(Of T)

Property Value

InArgument<T>

The object to compare to the keys in the Cases collection.

Attributes

RequiredArgumentAttribute

Examples

The following code sample demonstrates setting the Expression property of a Switch<T> activity.

// check if the number is ok...
new Switch<int>()
{
    DisplayName = "Verify Value from User",
    Expression = ExpressionServices.Convert<int>( env => numberFromUser.Get(env).CompareTo(numberToGuess.Get(env)) ),
    Cases =
    {
        { 0, new Assign<bool>()
            {
                To = new OutArgument<bool>(finished),
                Value = true
            }
        },
        {  1, new WriteLine() { Text = "    Try a lower number number..." } },
        { -1, new WriteLine() { Text = "    Try a higher number" } }
    }
}

Remarks

The comparison occurs after the expression is evaluated.