C#中的用例切换 [英] use case-switch in c#

问题描述

    public class Icon
    {
        public int IconID { get; set; }
        public string Title { get; set; }
        public string Room { get; set; }
        public string ImageCover { get; set; }
    }
    public class IconManager
    {
        public static List<Icon> GetIcons()
        {
            var Icons = new List<Icon>();
            Icons.Add(new Icon { IconID = 1, Title = "Fan", Room = "Enter-Room", ImageCover = "Assets/1.png" });
            Icons.Add(new Icon { IconID = 2, Title = "AirConditioner", Room = "Enter-Room", ImageCover = "Assets/2.png" });
            Icons.Add(new Icon { IconID = 3, Title = "WifiRouter", Room = "Enter-Room", ImageCover = "Assets/3.png" });
            Icons.Add(new Icon { IconID = 4, Title = "Camera", Room = "Enter-Room", ImageCover = "Assets/4.png" });
            Icons.Add(new Icon { IconID = 5, Title = "OfficePhone", Room = "Enter-Room", ImageCover = "Assets/5.png" });
            Icons.Add(new Icon { IconID = 6, Title = "TV", Room = "Enter-Room", ImageCover = "Assets/6.png" });
            Icons.Add(new Icon { IconID = 7, Title = "Clean", Room = "Enter-Room", ImageCover = "Assets/7.png" });
            return Icons;
        }
    }

当我单击每个项目时，我将导航到该框架，但如何使用 switch case 执行此操作?这是我的 click_event

When I click each item i will navigate to that frame but how to do it with switch case ? here is my click_event

    private void Grid_Clicked(object sender, ItemClickEventArgs e)
    {
        var icon = (Icon)e.ClickedItem;
        IconResult.Text = "You selected a " + icon.Title;
        var container = ForegroundElement.ContainerFromItem(e.ClickedItem) as GridViewItem;
        if (container != null)
        {
            //find the image
            var root = (FrameworkElement)container.ContentTemplateRoot;
            var image = (UIElement)root.FindName("ConnectedElement");

            //prepare the animation
            ConnectedAnimationService.GetForCurrentView().PrepareToAnimate("Image", image);
        }
        switch (icon)
        {
            case icon.Title = "Fan";
            Frame.Navigate(typeof(FanDetail));

        }
    }

我在这里遇到了错误

case icon.Title = "粉丝";它说不能将类型 String 转换为 'ClickableGrid.Icon'

case icon.Title = "Fan"; it said cannot convert type String to 'ClickableGrid.Icon'

推荐答案

不能以这种方式使用 C# switch 语句.您应该将其替换为 if 语句或使用新的 模式匹配功能在 C# 7 中引入:

You can't use C# switch statement this way. You should replace it with a if statement or use the new pattern matching feature introduced with C# 7:

switch (icon)
{
    case Icon i when i.Title == "Fan":
    {
       Frame.Navigate( typeof(FanDetail) );
       break;
    }
    default:
       break;
}

但是，如果您拥有的唯一类型是 Icon，您可以更简单地打开 Title 本身:

However, if the only type you have is an Icon, you can more simply switch on the Title itself:

switch (icon.Title)
{
    case "Fan":
    {
       Frame.Navigate( typeof(FanDetail) );
       break;
    }
    default:
       break;
}

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