打开XML文字内容控件 [英] Open XML word content controls

问题描述

这是我的代码试图获取带有标签"company"的内容控件

Here is my code trying to get the content controls with the tag "company"

                using (WordprocessingDocument template = WordprocessingDocument.Open("d:/dev/ProposalTemplate1.dotx", true))
                {
                MainDocumentPart mainPart = template.MainDocumentPart;
                SdtBlock block = mainPart.Document.Body.Descendants<SdtBlock>().Where(r => r.SdtProperties.GetFirstChild<Tag>().Val == "TEST").Single();
                Text t = block.Descendants<Text>().Single();
                t.Text = "COMPANY_NAME"; 
                }

由于查询行，出现错误对象引用未设置为对象的实例"，但我不知道为什么...

I got the error "Object reference not set to an instance of an object" because of the query line but I don't know why...

当我创建一个仅带有一个内容控件的简单模板，而使用较大的Word模板时，此效果很好

This works well when I create a simple template with just one content controls but not when using a bigger word template

有什么主意吗?

编辑 我尝试在没有.Single()的情况下执行此操作，但仍无法正常工作

EDIT I try doing it without .Single() but still not working

            MainDocumentPart mainPart = template.MainDocumentPart;
            var blocks = mainPart.Document.Body.Descendants<SdtBlock>().Where(r => r.SdtProperties.GetFirstChild<Tag>().Val == "Company");
            foreach (SdtBlock block in blocks)
            {
                Text t = block.Descendants<Text>().Single();
                t.Text = "COMPANY1";
            }

编辑2 我更改了Text.Single() 问题仍然存在，SdtBlock block = ...行上的对象引用未设置为对象的实例"

EDIT 2 I change the Text.Single() The problem is still there "Object reference not set to an instance of an object" on the SdtBlock block = ... line

            MainDocumentPart mainPart = template.MainDocumentPart;
            var blocks = mainPart.Document.Body.Descendants<SdtBlock>().Where(r => r.SdtProperties.GetFirstChild<Tag>().Val == "Company");
            foreach (SdtBlock block in blocks)
            {
                var t = block.Descendants<Text>();
                foreach (Text text in t)
                {
                    text.Text = "COMPANY1";
                }
            }

推荐答案

并非所有SdtBlock元素都具有子Tag元素.您假设其中一个存在，并尝试访问Val属性，但这样做会得到空引用异常.

Not all SdtBlock elements have child Tag elements. You are assuming one exists and attempting to access the Val property but are getting a null reference exception in doing so.

您可以通过在Where谓词中检查是否为空来解决此问题:

You can fix it by checking for null within the Where predicate:

var blocks = mainPart.Document.Body.Descendants<SdtBlock>().Where(r => 
    {
        var tag = r.SdtProperties.GetFirstChild<Tag>();
        return tag != null && tag.Val == "Company";
    });

根据评论，我的在此处中提供了有关您最初使用Single时遇到的问题的更多信息.

As per the comments there is more information about the issues you originally had with using Single in my answer here.

这篇关于打开XML文字内容控件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！