获取格式错误时导出HTML表格到Excel

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我在C＃中，但是当打开导出HTML表到Excel中脱颖而出它给我的错误，如：获取格式错误时导出HTML表格到Excel

我尝试了不同的扩展名与“办公室document.spreadsheetml.sheet“像.xlsx也仍然给出相同的错误。以下是我的C＃代码：

//StrExport.Append(@"<html xmlns='urn:schemas-microsoft-com:office:Spreadsheet' xmlns:ss='urn:schemas-microsoft-com:office:Spreadsheet' xmlns='http://www.w3.org/TR/REC-html40'><head><title>Time</title>"); 
     //StrExport.Append(@"<body lang=EN-US id=h1><div class=Section1>"); 
     StrExport.Append(@"<html xmlns:o='urn:schemas-microsoft-com:office:office' xmlns:w='urn:schemas-microsoft-com:office:excel' xmlns='http://www.w3.org/TR/REC-html40'><head><title>Time</title>"); 
     StrExport.Append(@"<body lang=EN-US style='mso-element:header' id=h1><span style='mso--code:DATE'></span><div class=Section1>"); 
     StrExport.Append("<DIV style='font-size:12px;'>"); 
     StrExport.Append(dvInfo.InnerHtml); 
     StrExport.Append("</div></body></html>"); 
     string strFile = "StudentInformations.xls"; 
     // string strFile = "StudentInformations.xlsx"; 
     string strcontentType = "application/excel"; 
     //string strcontentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"; 
     Response.ClearContent(); 
     Response.ClearHeaders(); 
     Response.BufferOutput = true; 
     Response.ContentType = strcontentType; 
     Response.AddHeader("Content-Disposition", "attachment; filename=" + strFile); 
     Response.Write(StrExport.ToString()); 
     Response.Flush();    
     Response.End();

请提供此消息的解决方案。

来源

2016-06-10 jitendra kumar