C＃/ WPF：Richtextbox：查找所有图像

i want a chat with inline images. The richtextbox good, because i can place images in it, but i want to send the text / images separate. -first: send the text (and place a image-placeholder in the text). -second: send the image and replace it with the placeholder.i want a chat with inline images. The richtextb