How to Save Signature as Byte Array in .NET MAUI Signature Pad Control?

This article demonstrates how to save a signature as a byte array using the .NET MAUI Signature Pad control. Follow the steps below.

Step 1: Initialize the Signature Pad Control

XAML

<VerticalStackLayout Padding="50,0,50,0" Spacing="10">
   <Label Text="Signature:" FontSize="20" FontAttributes="Bold" FontFamily="OpenSansSemibold"/>
   <Frame>
       <sign:SfSignaturePad x:Name="signaturePad" Background="WhiteSmoke" HeightRequest="200" DrawCompleted="SfSignaturePad_DrawCompleted"/>
   </Frame>
   <Label Text="Save Signature as Byte Array:" FontSize="20" FontAttributes="Bold" FontFamily="OpenSansSemibold"/>
   <Frame>
       <Image x:Name="image" HeightRequest="250"/>
   </Frame>
</VerticalStackLayout>  

Step 2: Implement the Logic to Convert Signature into a Byte Array

C#

private void SfSignaturePad_DrawCompleted(object sender, EventArgs e)
{
   StreamImageSource streamImageSource = (StreamImageSource)signaturePad.ToImageSource();
   System.Threading.CancellationToken cancellationToken = System.Threading.CancellationToken.None;
   Task<Stream> task = streamImageSource.Stream(cancellationToken);
   Stream stream = task.Result;
   byte[] bytes = new byte[stream.Length];
   stream.Read(bytes, 0, bytes.Length);
   MemoryStream memoryStream = new MemoryStream(bytes);
   image.Source = ImageSource.FromStream(() => memoryStream);
}  

Output:

Download the complete sample from GitHub.

Conclusion
I hope you enjoyed learning how to save a signature as a byte array in the .NET MAUI Signature Pad.

For more features, visit our .NET MAUI Signature Pad’s feature tour and explore the .NET MAUI Signature Pad documentation.

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