如果字段为空，则dataSet.writeXml不写空标记C# [英] dataSet.writeXml does not write an empty tag if the field was empty C#

问题描述

我想使用.writeXml函数创建DataSet的XML.如果我的数据集中的条目为空，那么我想使用一个空标签而不是缺少标签:

I want to create a XML of my DataSet using the .writeXml-function. If an entry in my DataSet was null, i would like to have an empty tag instead of a missing tag:

例如，如果约翰没有年龄，应该是什么样子:

example how it should look like if John had no age:

  <MyDataSet>
    <ID>8613458</ID>
    <AW_ID>37534778</AW_ID>
    <NAME>Peter</NAME>
    <AGE>22</AGE>
  </MyDataSet>
  <MyDataSet>
    <ID>8613459</ID>
    <AW_ID>37534779</AW_ID>
    <NAME>John</NAME>
    <AGE></AGE>
  </MyDataSet>

示例现在的样子:

  <MyDataSet>
    <ID>8613458</ID>
    <AW_ID>37534778</AW_ID>
    <NAME>Peter</NAME>
    <AGE>22</AGE>
  </MyDataSet>
  <MyDataSet>
    <ID>8613459</ID>
    <AW_ID>37534779</AW_ID>
    <NAME>John</NAME>
  </MyDataSet>

您知道我需要做什么吗?谢谢您的帮助！

Do you know what I need to do? Thanks for your help!!

推荐答案

我认为您无法更改，因此如果它们为NULL，则将写入空值，因为NULL与空值不同.
但是，如果age的数据类型是字符串，则只需遍历数据集并将所有NULL更改为空字符串，然后再将其写入XML，即可获得想要的效果.

I don't think you can change so that it writes empty values if they are NULL since NULL is different from empty.
However, if the datatype of age is a string, just go through the dataset and change any NULLs to empty strings before writing it to XML and you'd get the effect you want.

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