Switch<T>.Cases 属性

定义

命名空间:

System.Activities.Statements

程序集:

System.Activities.dll

表示可能执行路径的字典。 每个条目都包含一个键以及一个将在表达式结果与该键匹配时执行的活动。

public:
 property System::Collections::Generic::IDictionary<T, System::Activities::Activity ^> ^ Cases { System::Collections::Generic::IDictionary<T, System::Activities::Activity ^> ^ get(); };

public System.Collections.Generic.IDictionary<T,System.Activities.Activity> Cases { get; }

member this.Cases : System.Collections.Generic.IDictionary<'T, System.Activities.Activity>

Public ReadOnly Property Cases As IDictionary(Of T, Activity)

属性值

IDictionary<T,Activity>

执行路径。

示例

下面的代码示例演示如何设置 Switch<T> 活动的 Cases 属性。

// 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" } }
    }
}

注解

当该活动执行时，所执行的 case 是其键与 Expression 属性匹配的第一个 case。