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如何获取x:code-behind/XAML中元素的名称

xamarin.forms xamarin xaml c#

3

Diego Venâncio · 技术社区 · 7 年前

<Image x:Name="image1" Source="image1.png">
<Image.GestureRecognizers>
<TapGestureRecognizer Tapped="OnTapGestureTap" NumberOfTapsRequired="1" />
</Image.GestureRecognizers>
</Image>

<Image x:Name="image2" Source="image2.png">
<Image.GestureRecognizers>
<TapGestureRecognizer Tapped="OnTapGestureTap" NumberOfTapsRequired="1" />
</Image.GestureRecognizers>
</Image>

单击时,图像会调用一些操作。现在在 xaml.cs 文件我需要得到的图像被点击使用转换 :

    async void OnTapGestureTap(object sender, EventArgs args)
    {
        switch () //--HOW VERIFY IN SWiTCH WHICH IMAGE WAS CLICKED???
        {
            case image1:
                await Navigation.PushAsync(new Image1Page());
                break;
            case image2:
                await Navigation.PushAsync(new Image2Page());
                break;
        }
    }

4 回复 | 直到 7 年前

1

4

SushiHangover 7 年前

您可以检索原始图像名称并打开该字符串:

if (sender is Image image)
{
    switch (image.Source as FileImageSource).File) 
    {
        case "image1.png":
            Console.WriteLine("image1.png");
            break;
        case "image2.png":
            Console.WriteLine("image2.png");
            break;
    }
}

2

TheGeneral 7 年前

如果你真的把心放在一个开关上,这可能会奏效。假设发送方实际上是一个 Image x:Name

使现代化

 if(sender == image1)
      ...

async void OnTapGestureTap(object sender, EventArgs args)
{
   if(sender is Image image)
   {
      switch (image.Name) // switch on the name
      {
         case "image1":
            await Navigation.PushAsync(new Image1Page());
            break;
         case "image2":
            await Navigation.PushAsync(new Image2Page());
            break;
      }
   }
}

笔记 :这完全没有经过测试

3

1

Marko Ivanovic 7 年前

你可以用来自图像的属性

<Image ClassId="image1" Source="image1.png">
   <Image.GestureRecognizers>
      <TapGestureRecognizer Tapped="OnTapGestureTap" NumberOfTapsRequired="1" />
   </Image.GestureRecognizers>
</Image>

<Image ClassId="image2" Source="image2.png">
   <Image.GestureRecognizers>
      <TapGestureRecognizer Tapped="OnTapGestureTap" NumberOfTapsRequired="1" />
   </Image.GestureRecognizers>
</Image>

在后台切换一下

async void OnTapGestureTap(object sender, EventArgs args)
{
    var image = sender as Image;
    switch (image.ClassId)
    {
        case "image1":
            await Navigation.PushAsync(new Image1Page());
            break;
        case "image2":
            await Navigation.PushAsync(new Image2Page());
            break;
    }
}

4

0

sfyan_pgr 7 年前

试试这个

 async void OnTapGestureTap(object sender, EventArgs args)
{ 
  var image = sender as Image;

    switch (image) 
    {
        case image1:
            await Navigation.PushAsync(new Image1Page());
            break;
        case image2:
            await Navigation.PushAsync(new Image2Page());
            break;
    }
}

5

0

kristytoman 5 年前

StyleID 如果未指定,则此属性将继承 x:Name

x:姓名

if (sender == image1)
{
    await Navigation.PushAsync(new Image1Page());
}
else if (sender == image2) 
{
    await Navigation.PushAsync(new Image2Page());
}

名称“image1”在当前上下文中不存在。

但是当XAML加载它时,将创建上下文。