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Switch<T>.Expression Property

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

Namespace:  System.Activities.Statements
Assembly:  System.Activities (in System.Activities.dll)

[RequiredArgumentAttribute]
public InArgument<T> Expression { get; set; }

Property Value

Type: System.Activities.InArgument<T>
The object to compare to the keys in the Cases() collection.

The comparison occurs after the expression is evaluated.

The following code sample demonstrates setting the Expression property of a Switch<T> activity. This example is from the Using Procedural Activities sample.


// 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" } }
    }
}


.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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