[英]Constant NullReference Exception using OpenXML on a DOCX file
I'm trying to parse through a lengthy file and remove sections that I don't want. 我正在尝试解析一个冗长的文件,并删除不需要的部分。 From research It appears that the OpenXml SDK was the easiest reference for manipulating and searching through the word doc. 从研究看来,OpenXml SDK是操纵和搜索doc文档的最简单参考。 Unfortunately, it's not always consistent because I keep getting NullReferenceExceptions
when trying to assign nodes like to a run object. 不幸的是,它并不总是一致的,因为在尝试将节点分配给运行对象时,我不断收到NullReferenceExceptions
。 Essentially, my program should go through the docx file and find the tags (ver 1) and then remove everything in between it and the closing tag (/ver 1). 本质上,我的程序应该遍历docx文件并找到标签(版本1),然后删除其与结束标签之间的所有内容(/版本1)。 this only seems to work for some section as other sections I get the NullReferenceException
and I feel it has to do with the messy formatting that MS Word uses but I don't know. 这似乎只对某些部分有效,而其他部分却得到了NullReferenceException
,我认为这与MS Word使用的混乱格式有关,但我不知道。
Here's the code for a particular section if anyone could help I'd Appreciate it. 如果有人可以帮助,以下是特定部分的代码,我将不胜感激。
IEnumerable<OpenXmlElement> elem = main.Document.Body.Descendants().ToList();
foreach (OpenXmlElement elems in elem)
{
if (elems is Text && elems.InnerText == s_Ver1)// s_Ver1 = "(Ver 1)"
{
Run run = (Run)elems.Parent;
Paragraph p = (Paragraph)run.Parent;
p.RemoveAllChildren();
p.Remove();
foreach (OpenXmlElement endelems in elem)
{
if (endelems is Text && elems.InnerText == e_Ver1)//e_Ver1 = "(/Ver1)"
{
run = (Run)endelems.Parent;
p = (Paragraph)run.Parent;
p.Remove();
break;
}
else
{
Run d_Run = (Run)endelems.Parent;
Paragraph d_p = (Paragraph)d_Run.Parent;
d_p.RemoveAllChildren();
d_p.Remove();*/
try
{
endelems.Remove();
}
catch(Exception err)
{
MessageBox.Show(err.ToString());
}
}
}
}
}
Edit 编辑
try catch with in the code ( around the endelems.remove() ) 尝试在代码中捕捉(在endelems.remove()周围)
System.InvalidOperationException: The Parent of this element is Null
//it also says line 141 but I'm not sure how to get line numbering in vs2010
try catch error around entire thing 尝试抓住整个事情的错误
System.NullReferenceException: Object reference not set to an instance of an object
//line 114 which would be Paragraph p = (Paragraph)run.Parent; line
I am not quite sure what you are trying to do here, but... 我不确定您要在这里做什么,但是...
You get a static list of children from the body. 您会从身体中获得一个静态的孩子清单。
You iterate over possibly deleted children. 您遍历可能已删除的子级。 And then call remove a child that were already removed with RemoveAllChildren()
. 然后调用remove一个已经通过RemoveAllChildren()
删除的孩子。
Not to mention this faulty logic. 更不用说这种错误的逻辑了。
if (endelems is Text && elems.InnerText == e_Ver1)//e_Ver1 = "(/Ver1)"
{
...
else
{
Run d_Run = (Run)endelems.Parent;
}
In the else clause, endelems will probably not have a parent that is a Run
, since it probably wouldn't be a Text
element. 在else子句中,endelems可能没有作为Run
的父对象,因为它可能不是Text
元素。
--- EDIT --- pseudocode -编辑-伪代码
IEnumerable<Text> elems = wd.MainDocumentPart.Document.Body.Descendants<Text>();
foreach (Text elem in elems)
{
if(elem.InnerText.Equals("Ver 1"))
{
IEnumerable<OpenXmlElement> afterelems = elem.ElementsAfter();
foreach(OpenXmlElement openelem in afterelems)
{
if(openelem is Text && ((Text)openelem).InnerText.Equals("Ver 2"))
{
break;
} else if(openelem is Text) {
openelem.Remove();
}
}
break;
}
}
foreach (Run run in wd.MainDocumentPart.Document.Body.Descendants<Run>().Where(run => run.Descendants<Text>().Count() == 0 && run.Descendants<Break>().Count() == 0))
{
run.Remove();
}
foreach (Paragraph par in wd.MainDocumentPart.Document.Body.Descendants<Paragraph>().Where(par => par.Descendants<Run>().Count() == 0 && par.Descendants<Table>().Count() == 0))
{
par.Remove();
}
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