如题，C#在xml文件中指定节点插入节点和属性

Question

<TableColumns>
<TableColumn id="MIEdIndex">
<Width>6.61471cm</Width>
</TableColumn>
<TableColumn id="IndexUnit">
在这里插入节点和属性
<Width>2.19578cm</Width>
</TableColumn>
<TableColumn id="MIEdQty">
<Width>2.88487cm</Width>
</TableColumn>
<TableColumn id="MIEdAoyQty">
<Width>2.85988cm</Width>
</TableColumn>
<TableColumn id="MIEdUpQty">
<Width>2.83488cm</Width>
</TableColumn>
<TableColumn id="MIEdUpAoyQty">
<Width>2.85988cm</Width>
</TableColumn>
</TableColumns>
插入节点后代码为这样，哪位大神帮帮忙
<TableColumns>
<TableColumn id="MIEdIndex">
<Width>6.61471cm</Width>
</TableColumn>
<TableColumn id="IndexUnit">
<Visibility>
<Hidden>true</Hidden>
</Visibility>
<Width>2.19578cm</Width>
</TableColumn>
<TableColumn id="MIEdQty">
<Width>2.88487cm</Width>
</TableColumn>
<TableColumn id="MIEdAoyQty">
<Width>2.85988cm</Width>
</TableColumn>
<TableColumn id="MIEdUpQty">
<Width>2.83488cm</Width>
</TableColumn>
<TableColumn id="MIEdUpAoyQty">
<Width>2.85988cm</Width>
</TableColumn>
</TableColumns>

Answer 1

书c#对xml的应用，里面涉及到多有操作