如何使用一个流设置两个图像源

Question

我有这段代码

 Task.Run(async () =>
 {    
              stream = await DependencyService.Get<IPicturePicker>().GetImageStreamAsync();

                 if (stream != null)
                 {

                     Device.BeginInvokeOnMainThread(() =>
                     {
                         ImageOne.Source = ImageSource.FromStream(() => stream);
                         ImageTwo.Source = ImageSource.FromStream(() => stream);

                     });

                 }
} 

代码的问题是只有ImageTwo.Source被设置（因为它是最后一个）。如何使用相同的流设置ImageOne和ImageTwo？有没有比我正在做的更好的方法呢？

Answer 1

以下是您可以做的事情：

Device.BeginInvokeOnMainThread(async () =>
            {
                Stream stream = await DependencyService.Get<IPicturePicker>().GetImageStreamAsync();
                var memoryStream = new MemoryStream();
                await stream.CopyToAsync(memoryStream);

                image1.Source = ImageSource.FromStream(() => { return new MemoryStream(memoryStream.ToArray()); });
                image2.Source = ImageSource.FromStream(() => { return new MemoryStream(memoryStream.ToArray()); });
            });

Answer 2

也许你可以这样做：

$today = date("Y-m-d");
$todaytime = strtotime($today);

$testdate = "2017-06-31";
$testtime = strtotime($testdate);

$back7days = strtotime("-7 days",$todaytime);
if($testtime < $back7days)
    echo "X"; // do somthing if testdate was more than 7 days ago


$fwd7days = strtotime("+7 days", $todaytime);
if($testtime > $fwd7days)
    echo "Y"; // do somthing if testdate is more than 7 days in future  

你应该测试，我没有尝试过。