How can I send a base64 encoded image?

问题

I would like to respond to a conversation by providing a barcode (.PNG) that has been base64 encoded. Is that possible? Or is the only method of delivery thru a Url.

回答1:

Try:

replyMessage.Attachments.Add(new Attachment()
{
     ContentUrl = $"data:image/jpeg;base64,{Convert.ToBase64String(bdata)}"
});

Or as JSON:

{
    "attachments": 
    [
        {
            "contentUrl": $"data:image/jpeg;base64,{Convert.ToBase64String(bdata)}"
        }
    ]
}

Where bdata is a byte array

来源：https://stackoverflow.com/questions/37574157/how-can-i-send-a-base64-encoded-image