在Windows手机上使用图像选择器不需要等到选择一个图像

Question

在Windows phone 8上，我有一个函数，从图片库中获取图像，应该将其作为基本字符串发送到服务器，但是当调用pick image时，它会将我传输到图片库页面，但不会等到我选择它继续向服务器发送空数据。

public void Chplaceimg(string PlaceID)
{
    YOimage changeplaceimg = new YOimage();
    if (changeplaceimg.pickImage() != null)
    {
        var pairs = new List<KeyValuePair<string, string>>
        {
           new KeyValuePair<string, string> ("id", _id),
           new KeyValuePair<string, string> ("image", changeplaceimg._base64Image),
           new KeyValuePair<string, string> ("place", PlaceID)
        };
        var serverData = serverConnection.connect("image.php", pairs);
    }
}
public bool pickImage()
{
    var photoChooserTask = new PhotoChooserTask();
    photoChooserTask.Completed += PhotoChooserTaskCompleted;
    photoChooserTask.Show();
    return true;
}
//run function convertToBase64 when an image is choosed
private void PhotoChooserTaskCompleted(object sender, PhotoResult e)
{
    if (e.TaskResult == TaskResult.OK)
    {
       convertToBase64(e);
    }
}

Answer 1

您必须将服务调用作为PhotoChooserTaskCompleted回调的一部分。

//run function convertToBase64 when an image is choosed
private void PhotoChooserTaskCompleted(object sender, PhotoResult e)
{
    if (e.TaskResult == TaskResult.OK)
    {
        // send data to server here
        convertToBase64(e);
    }
}