如何使用XDocument从集合中读取值来生成XML？

Question

我有一个字符串列表

List<string> lststr = new List<string>() { "1,", "2" };

我需要生成以下

<DbRuleMappings>
  <DbRuleMapping dbDetailId="1" ruleMasterId="1" activeFlag="1" />
  <DbRuleMapping dbDetailId="1" ruleMasterId="2" activeFlag="1" />
  <DbRuleMapping dbDetailId="1" ruleMasterId="3" activeFlag="1" />
  <DbRuleMapping dbDetailId="1" ruleMasterId="4" activeFlag="1" />
  <DbRuleMapping dbDetailId = "2" ruleMasterId="1" activeFlag="1"/>
  <DbRuleMapping dbDetailId = "2" ruleMasterId="2" activeFlag="1"/>
  <DbRuleMapping dbDetailId = "2" ruleMasterId="3" activeFlag="1"/>
  <DbRuleMapping dbDetailId = "2" ruleMasterId="4" activeFlag="1"/>
 </DbRuleMappings>

我的尝试......没有工作

List<string> lststr = new List<string>() { "1,", "2" };            

XDocument docDBRuleMapping =
        new XDocument(
           new XElement("DbRuleMappings",
                   Enumerable.Range(1, 4).Select(x => x)
                   .Select(i => new XElement("DbRuleMapping",  
                           new XAttribute("dbDetailId", i),
                           new XAttribute("ruleMasterId", i),
                           new XAttribute("activeFlag", 1)))));

Answer 1

您目前根本没有使用lststr。您需要基本上使用SelectMany与lststr加入Enumerable.Range。使用查询表达式可能最容易完成：

var detailIds = new List<int> { 1, 2 };

var doc = new XDocument(new XElement("DbRuleMappings",
    from detailId in detailIds
    from ruleId in Enumerable.Range(1, 4)
    select new XElement("DbRuleMapping",  
        new XAttribute("dbDetailId", detailId),
        new XAttribute("ruleMasterId", ruleId),
        new XAttribute("activeFlag", 1))));

（我已经将输入更改为List<int>而不是List<string>给定数据...如果您确实需要，它会与List<string>一起正常工作。

如果您不喜欢查询表达式，请参阅以下内容：

var detailIds = new List<int> { 1, 2 };

var doc = new XDocument(new XElement("DbRuleMappings",
    detailIds.SelectMany(_ => Enumerable.Range(1, 4),
        (detailId, ruleId) => new XElement("DbRuleMapping",  
            new XAttribute("dbDetailId", detailId),
            new XAttribute("ruleMasterId", ruleId),
            new XAttribute("activeFlag", 1)))));