C# Base64 String file extension mime type

Question

When I send a base64 string to an web api, do I need to pass the mime type eg jpg to define the file extension when the file is saved? if not how would I know what file type to save it as?

Answer 1

您可以在单独的变量中发送文件类型，在 base64 字符串前面加上分隔符，然后提取它，或者将 base64 字符串转换为字节数组，然后读取前几个字节以确定图像格式。