C# 操作xml文件操作

1.通过递归获取文件夹下的所有xml文件,并提取xml中内容

xml格式如下

<?xml version="1.0" encoding="utf-8"?>
<ROOT>
    <HEADDATA>
        <FROMPLATFORMCODE>E5119003117</FROMPLATFORMCODE>
        <TOPLATFORMCODE>P540</TOPLATFORMCODE>
        <DATA_NO>50</DATA_NO>
        <DATA_EN>PUECT</DATA_EN>
        <DATA_CN>目</DATA_CN>
        <DATA_TYPE>1</DATA_TYPE>
        <DATA_KEY>24506689-938f-4517a6</DATA_KEY>
        <TIMESTAMP>20190801084902</TIMESTAMP>
        <VERSION>2.0</VERSION>
    </HEADDATA>
    <DESCONTEXT>
        <PROGRAM_BUDGET>188000.000000</PROGRAM_BUDGET>
        <RELATE_CODE>0</RELATE_CODE>
        <PURCHASE_PROJECT_CODE>巴中竞采【2019】279-1号</PURCHASE_PROJECT_CODE>
        <PURCHASE_PROJECT_NAME>计算机(台式电脑)、服务器、交换设备、其他办公用品采购</PURCHASE_PROJECT_NAME>
        <UNIFIED_DEAL_CODE>D01-12513700062370904X-801-033087-T</UNIFIED_DEAL_CODE>
        <INVEST_PROJECT_CODE />
        <TENDER_PROJECT_TYPE>D01</TENDER_PROJECT_TYPE>
    </DESCONTEXT>
    <DESBINARYS />
</ROOT>

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