将图片数据写以二进制写到文档里

public static void WriteImageFile(string filePath, byte[] imageData)
{
    using (FileStream fs = new FileStream(filePath, FileMode.Create, FileAccess.Write))
    {
        using (BinaryWriter bw = new BinaryWriter(fs))
        {
            bw.Write(imageData);
        }
    }
}