邮件发送excel带预览excel功能

excel 打开后的内容:
思路：

1、邮件发送excel 是作为附件发送出去的；

2、excel 预览是，必须另外点击预览按钮，并不能直接预览邮件内容然后在邮件主体内容展示出来

根据以上两点基本没法实现邮件发送后邮件自带预览功能。

伪方法：

1、在邮件生成时把邮件要预览的部分粘贴成内容动态图片

2、在邮件生成后读取邮件里面的图片

3、把图片一高清方式设置按比例设置大小，这样图片大小是等比放大，这样不会变窄变长

4、邮件发送是把刚才获取的图片添加到邮件正文当中，从而达到类似预览的效果

步骤如下：

1、把excel 要发送出去的内容区域选中，复制后选中连接的图片，生成内容是动态的图片2、在邮件生成后读取邮件里面的图片

csharp 复制代码

#region Spire.XLS 获取img
Workbook workbook = new Workbook();
workbook.LoadFromFile(filePath);
//获取工作表
Worksheet sheet = workbook.Worksheets["汇总分析"];
Dictionary<string, string> keyValuesImg = new Dictionary<string, string>();
foreach (Spire.Xls.ExcelPicture picture in sheet.Pictures)
{
	/*Jpg:压缩,Png:无损压缩,Bmp:无压缩*/
	Image image = picture.Picture;
	MemoryStream ms = new MemoryStream();
	image.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
	picture.Picture.Save("C:\\Image" + picture.Name + ".PNG", System.Drawing.Imaging.ImageFormat.Png);
	picture.Picture.Save($@"{AppDomain.CurrentDomain.BaseDirectory}ExcelReport\OEE\OEE报表\Image" + picture.Name + ".PNG", System.Drawing.Imaging.ImageFormat.Png);
	if (!keyValuesImg.ContainsKey(picture.Name.Trim()))
	{
		keyValuesImg.Add(picture.Name.Trim(), Convert.ToBase64String(ms.ToArray()));
	}

	//Image image = picture.Picture;
	//MemoryStream ms = new MemoryStream();
	设置质量
	//EncoderParameters encoderParameters = new EncoderParameters(1);
	//encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);
	//ImageCodecInfo jpgEncoder = GetImageEncoder(ImageFormat.Bmp);
	保存
	//image.Save(ms, jpgEncoder, encoderParameters);
	//baseimg = Convert.ToBase64String(ms.ToArray());
	//picture.Picture.Save("C:\\Image" + picture.Name + ".Bmp", jpgEncoder, encoderParameters);

}
workbook.Dispose();

#endregion

3、设置图片等比大小和质量

csharp 复制代码

/*Jpg:压缩,Png:无损压缩,Bmp:无压缩*/
//设置质量
EncoderParameters encoderParameters = new EncoderParameters(1);
encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);
ImageCodecInfo jpgEncoder = GetImageEncoder(ImageFormat.Bmp);

4、把图片添加到邮件正文当中，并发送邮件

csharp 复制代码

#region SendEmail

/*创建 HTML 内容，将图片嵌入其中*/
string htmlBody = "<html><body>";
htmlBody += @"<p style='font-size:14px; font-weight:bold'>Dear All，</p>";
htmlBody += @"<p style='font-size:14px;'>&nbsp;&nbsp;&nbsp;&nbsp以下是当月设备OEE Report，请查阅<a href='https://xxxxxxx.com.hk/Home/Report?type=OEEReport'>【Dashboard】</a>，谢谢！</p>";
htmlBody += @"<p style='font-size:14px;'>&nbsp;&nbsp;&nbsp;&nbsp如需详细了解请查看附件明细数据，或 公共盘查询：<a href='file://filesvr02/Dashboard/OEE'>\\filesvr02\Dashboard\OEE</a></p>";
foreach (var entry in keyValuesImg)
{
	htmlBody += string.Format("<p><img src='data:image/png;base64,{0}' /></p>", entry.Value.ToString());
}
htmlBody += @"</body></html>";

/*文件流发送*/
MemoryStream memoryStream = new MemoryStream(File.ReadAllBytes(filePath));
// Create a StreamAttachment from the memory stream
List<StreamAttachment> attachment = new List<StreamAttachment>()
{
	new StreamAttachment{
		stream = memoryStream,
		name = $@"OEE-Report-{DateTime.Now.AddDays(-1).ToString("M-d")}.xlsx",
		mediaTyp = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
	}
};
EmailHelper.SendToEmail(listemai1, listemai2, "OEE-Report", htmlBody.ToString(), true, attachment, "Dashboard");
memoryStream.Dispose();

#endregion

效果：