尝试在HTML中将HTML保存为Word时出现HttpContext错误 [英] C# - HttpContext error when trying to save HTML to Word in C#

问题描述

我正在用c＃编写一个插件。并且我在 Stringwriter 中有一个html，我试图根据我在SO和Web上其他地方所研究的其他样本将它作为Word文档输出。如：将数据从c＃导出到word文档和 http：// www。 codeproject.com/Questions/196851/export-an-html-to-word-document-with-fixed-headers

在我的生活中，我找不到为什么我会在第一行 HttpContext 出现NullReference异常（实际上如何处理它是我卡住的）。

下面是代码：

使用System.Web，

  
 
 HttpContext.Current.Response.Clear（）; 
 HttpContext.Current.Response.Buffer = true; 
 HttpContext.Current.Response.ContentType =application // ms-word; 
 HttpContext.Current.Response.AddHeader（Content-Disposition，@attachment; filename = D：\WORK_ORDER.doc）; 
 HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF32; 
 HttpContext.Current.Response.Charset =UTF-16; 
 // HttpContext.Current.EnableViewState = false; 
 HttpContext.Current.Response.BinaryWrite（System.Text.Encoding.UTF8.GetPreamble（））; 
 HttpContext.Current.Response.Output.Write（swSource.ToString（））; 
 HttpContext.Current.Response.Flush（）; 
 HttpContext.Current.Response.End（）; 
  

我相信这太简单了。有人能指出我在这里错过了什么吗？感谢。

更新：我已经发布了堆栈跟踪，但它并不冗长。附加信息更具说服力：

其他信息：未将对象引用设置为对象实例。

所有类似的例子都只显示这个代码，没有实例化，所以我不知道如何做到这一点，所以我希望得到一些建议。

更新：
$ b 根据批准的答案，发生的情况是， code> System.Web 并不意味着你可以在非web应用中使用这个 HttpContext 对象。

请参阅我在下面发表的解答作为回答。 我猜测我会说你的项目是一个类库或一些非web应用程序项目。

如果是这种情况，您将无法访问httpcontext，而您将不得不将项目更改为Web项目，或者您可以查看保存文件的其他方法。例如：
在桌面上将文本文件写入文件夹

*注意我还没有试过建议的解决方案。

I am writing a plugin in c#. And I have an html in a Stringwriter and I am trying to output it as a Word document based on other samples I have researched on SO and other places on the web. Such as this: Exporting data from c# to word document and http://www.codeproject.com/Questions/196851/export-an-html-to-word-document-with-fixed-headers

For the life of me I cannot figure out why I get a NullReference exception on the first line HttpContext appears (actually how to handle it is what I am stuck on).

Here is the code:

using System.Web;

HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.ContentType = "application//ms-word";
HttpContext.Current.Response.AddHeader("Content-Disposition", @"attachment; filename=D:\WORK_ORDER.doc");
HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF32;
HttpContext.Current.Response.Charset = "UTF-16";
// HttpContext.Current.EnableViewState = false;
HttpContext.Current.Response.BinaryWrite(System.Text.Encoding.UTF8.GetPreamble());
HttpContext.Current.Response.Output.Write(swSource.ToString());
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();

I am sure it is too simple. Can somebody point out what I am missing here? Thanks.

Update: I had posted the stack trace, but it is non-informative an lengthy. The additional information is more telling:

Additional information: Object reference not set to an instance of an object.

All the similar examples show only this code, no instantiation, so I am at loss how to do this, so I'd appreciate some advice.

Update:

According to the approved answer all that happened, that importing the reference library System.Web does not mean that you can use this HttpContext object in a non-web app.

See my solution posted below as an answer.

解决方案

If I were to guess I'd say your project is a class library or some non web application project.

If this is the case you will not have access to httpcontext and you'll either have to change your project to a web project or you can look at alternative methods of saving your file. For example: Writing Text File to Folder on Desktop

*note I've not tried the suggested solution.

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