I take this FETCH but the result does not contain the field enityimage, ...because
string imageUrlQuery = "<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false'>" +
"<entity name='product'>" +
"<attribute name='name'/>" +
"<attribute name='entityimage'/>" +
"</entity>" +
"</fetch>";
foreach (var single_image in xrm.RetrieveMultiple(new FetchExpression(imageUrlQuery)).Entities)
{
byte[] imageBytes = (byte[])(single_image.Attributes["entityimage"]);
MemoryStream ms = new MemoryStream(imageBytes);
Image img = Image.FromStream(ms);
img.Save("url");
}
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