签名板Xamarin.Forms将签名另存为文件 [英] Signature Pad Xamarin.Forms Saving signature as a file

问题描述

我是Xamarin的初学者. 我试图编写一个简单的应用程序来借助Signature Pad保存签名. 来自MainPage.xaml的一段代码

I am a beginner in Xamarin. I tried to write a simple app to save the signature with the help of Signature Pad. A piece of code from MainPage.xaml

<controls:SignaturePadView x:Name="SignaturePAD"
                           Grid.Row="1" 
                           StrokeColor="Black" 
                           StrokeWidth="3"
                           BackgroundColor="Gray" 
                           CaptionTextColor="Black"
                           PromptTextColor="Black"
                           SignatureLineColor="Black"
                           CaptionText="Podpis odbiorcy">
</controls:SignaturePadView>

<Button Grid.Row="2" 
        x:Name="SaveButton"
        Text="Potwierdź" 
        Clicked="SaveSignature"/>

和MainPage.xaml.cs中的一个片段

and a fragment from MainPage.xaml.cs

public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();
    }

    public async void SaveSignature(object sender, EventArgs e)
    {
        Stream image = await SignaturePAD.GetImageStreamAsync(SignatureImageFormat.Png);

    }

}

我的问题是如何将其保存到手机库中? 我将不胜感激

And my question is how can I save it into the my phone gallery? I will be grateful for any help

推荐答案

SignaturePad返回流-因此您可以使用普通的C#I/O将其写入文件，例如FileStream

the SignaturePad returns a stream - so you can write it to a file using normal C# I/O, like FileStream

Stream image = await SignaturePAD.GetImageStreamAsync(SignatureImageFormat.Png);

using (FileStream file = new FileStream(file_path, FileMode.Create, System.IO.FileAccess.Write))
{
  image.CopyTo(file);
}

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