c# - 如何从 Xamarin Forms 中的自定义控件创建图像？
问题描述
我的应用程序中有一个自定义控件，效果很好。现在我想从那个视图中制作一个图像。
我的自定义控件：
<?xml version="1.0" encoding="UTF-8"?>
<Grid xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:controls="clr-namespace:Project.Controls"
xmlns:ffimageloading="clr-namespace:FFImageLoading.Forms;assembly=FFImageLoading.Forms"
xmlns:fftransformations="clr-namespace:FFImageLoading.Transformations;assembly=FFImageLoading.Transformations"
xmlns:yummy="clr-namespace:Xamarin.Forms.PancakeView;assembly=Xamarin.Forms.PancakeView"
x:Name="ParentView"
x:Class="Project.Controls.CustomControl">
<Label x:Name = "myLabelInMyXaml" BackgroundColor = "{Binding CustomColorViewModel}"/>
它背后的代码：
public partial class CustomControl : Grid
{
public static readonly BindableProperty ItemProperty = BindableProperty.Create(nameof(Item), typeof(Item), typeof(CustomGrid), propertyChanged: ItemChanged);
public static readonly BindableProperty CustomColorProperty = BindableProperty.Create(nameof(IsAnonymousSubColor), typeof(Color), typeof(CustomGrid), propertyChanged: CustomColorChanged);
public Color CustomColor
{
get { return (Color)GetValue(CustomColorProperty); }
set { SetValue(CustomColorProperty, value); }
}
static void CustomColorChanged (object bindable, object oldValue, object newValue)
{
var x = bindable as CustomGrid;
if (x.Item != null)
{
x.myLabelInMyXaml.BackgroundColor = x.CustomColor;
}
}
static void ItemChanged (object bindable, object oldValue, object newValue)
{
var x = bindable as CustomGrid;
}
public Item Item
{
get { return (Item) GetValue(ItemProperty); }
set { SetValue(ItemProperty, value); }
}
public CustomGrid()
{
InitializeComponent();
}
}
所以这段代码运行良好，并且在应用程序中显示良好。现在我准备了一个按钮来通过 Xamarin.Essentials 插件共享它。https://docs.microsoft.com/en-us/xamarin/essentials/share?tabs=android
await Share.RequestAsync(new ShareFileRequest
{
Title = Title,
File = new ShareFile("" /* this is where the image will go*/)
});
现在我的问题是，我怎样才能把这个自定义控件变成一个图像源？我将其转换为 HTTP 地址之后的部分已经是我准备好的。所以澄清一下；问题是关于如何将自定义控件转换为图像源/字节 []。