(C#) SendGrid HTML Email with Embedded Images

See more SendGrid Examples

Demonstrates how to send an HTML email with embedded images using SendGrid.

Chilkat .NET Downloads

Chilkat .NET Framework

Chilkat for .NET Core

// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code

Chilkat.HttpRequest req = new Chilkat.HttpRequest();
Chilkat.Http http = new Chilkat.Http();

bool success;

// First.. load a JPG file and build an HTML img tag with the JPG data inline encoded.
// Our HTML img tag will look like this:
// <img src="data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEA3ADcAA..." alt="" style="border-width:0px;" />
Chilkat.BinData bdJpg = new Chilkat.BinData();
success = bdJpg.LoadFile("qa_data/jpg/starfish.jpg");
if (success == false) {
    Debug.WriteLine("Failed to load JPG file.");
    return;
}

// Note: HTML containing embedded base64 image data may not be visible in all email clients.
// For example, GMail might not display the image, but viewing in Outlook might be OK.
Chilkat.StringBuilder sbHtml = new Chilkat.StringBuilder();
sbHtml.Append("<html><body><b>This is a test<b><br /><img src=\"data:image/jpeg;base64,");
// Append the base64 image data to sbHtml.
bdJpg.GetEncodedSb("base64",sbHtml);
sbHtml.Append("\" alt=\"\" style=\"border-width:0px;\" /></body></html>");

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.UpdateString("personalizations[0].to[0].email","matt@chilkat.io");
json.UpdateString("personalizations[0].to[0].name","Matt");
json.UpdateString("from.email","admin@chilkatsoft.com");
json.UpdateString("subject","Test HTML email with images");
json.UpdateString("content[0].type","text/html");
json.UpdateSb("content[0].value",sbHtml);

http.AuthToken = "SENDGRID_API_KEY";

Chilkat.HttpResponse resp = null;
resp = http.PostJson3("https://api.sendgrid.com/v3/mail/send","application/json",json);
if (http.LastMethodSuccess != true) {
    Debug.WriteLine(http.LastErrorText);
}
else {
    Debug.WriteLine("response status code: " + Convert.ToString(resp.StatusCode));
    // Display the response.
    // If successful, the response code is 202 and the response body string is empty.
    // (The response body string may also be empty for error response codes.)
    Debug.WriteLine(resp.BodyStr);

}