Linq Lambda到XML的连接表达式

我有一个XML文件，格式如下

<?xml version="1.0" encoding="utf-8"?>
<root>

  <EntityType_Data>
    <EntityType>
      <ID>1</ID>
      <Caption>Entity1</Caption>
      <Description>Entity1</Description>
      <ModuleID>3</ModuleID>
      <Category>1</Category>
    </EntityType>
    <EntityType>
      <ID>2</ID>
      <Caption>Entity2</Caption>
      <Description>Entity2</Description>
      <ModuleID>3</ModuleID>
      <Category>1</Category>
    </EntityType>
    <EntityType>
      <ID>3</ID>
      <Caption>Entity4</Caption>
      <Description>Entity4</Description>
      <ModuleID>3</ModuleID>
      <Category>1</Category>
    </EntityType>
    <EntityType>
      <ID>4</ID>
      <Caption>Entity5</Caption>
      <Description>Entity5</Description>
      <ModuleID>3</ModuleID>
      <Category>1</Category>
    </EntityType>
    </EntityType_Data>
  <AttributeType_Table>
    <AttributeType>
      <ID>1</ID>
      <Caption>AttributeType1</Caption>
      <DataType>string</DataType>
      <SqlType>nvarchar(max)</SqlType>
     </AttributeType>
    <AttributeType>
      <ID>1</ID>
      <Caption>AttributeType2</Caption>
      <DataType>integer</DataType>
      <SqlType>int</SqlType>
     </AttributeType>

   </AttributeType_Table>
  <Attributes_Table>
    <Attribute>
      <ID>1</ID>
      <Caption>SingleLineTextbox</Caption>
      <AttributeTypeID>1</AttributeTypeID>
      </Attribute>
    <Attribute>
      <ID>2</ID>
      <Caption>MultiLineTextBox</Caption>
      </Attribute>
    <Attribute>
      <ID>3</ID>
      <Caption>OrgLevel</Caption>
      <AttributeTypeID>3</AttributeTypeID>
      </Attribute>
  </Attributes_Table>
  <EntityRelationtable>
    <EntityTypeAttributeRelation>
      <EntityTypeID>2</EntityTypeID>
      <AttributeID>1</AttributeID>
    </EntityTypeAttributeRelation>
    <EntityTypeAttributeRelation>
      <EntityTypeID>3</EntityTypeID>
      <AttributeID>2</AttributeID>
      </EntityTypeAttributeRelation>
    <EntityTypeAttributeRelation>
      <EntityTypeID>3</EntityTypeID>
      <AttributeID>1</AttributeID>
      </EntityTypeAttributeRelation>
    <EntityTypeAttributeRelation>
      <EntityTypeID>3</EntityTypeID>
      <AttributeID>3</AttributeID>
      </EntityTypeAttributeRelation>
    <EntityTypeAttributeRelation>
      <EntityTypeID>2</EntityTypeID>
      <AttributeID>2</AttributeID>
      </EntityTypeAttributeRelation>
  </EntityRelationtable>
</root>

---

我正在考虑将这个结果与“AttributeType_Table”元素“AttributeID”

结合起来，最后我用with linq query only而不是linq Lambda解决了我的问题

var attributeresult = from a in workingXmldoc.Descendants("EntityRelationtable").Elements("EntityTypeAttributeRelation")
                          join b in workingXmldoc.Descendants("Attributes_Table").Elements("Attribute")
                          on (string)a.Element("AttributeID") equals (string)b.Element("ID")
                          join c in workingXmldoc.Descendants("Attributetype_Table").Elements("AttributeType")
                          on (string)b.Element("AttributeTypeID") equals (string)c.Element("ID")                                                                                           
                          where (string)a.Element("EntityTypeID") == "" + entitytypeId + ""
                          select new {
                              AttributeID = a.Element("AttributeID").Value,
                              AttributeName = b.Element("Caption").Value,
                              AttributeDatatype = c.Element("DataType").Value,
                              AttributeSqltype = c.Element("SqlType").Value
                          };

---

如果有人给了Linq lambda一个值得欣赏的查询..

最后我用with Linq query only而不是Linq lambda解决了我的问题

var attributeresult = from a in workingXmldoc.Descendants("EntityRelationtable").Elements("EntityTypeAttributeRelation")
                          join b in workingXmldoc.Descendants("Attributes_Table").Elements("Attribute")
                          on (string)a.Element("AttributeID") equals (string)b.Element("ID")
                          join c in workingXmldoc.Descendants("Attributetype_Table").Elements("AttributeType")
                          on (string)b.Element("AttributeTypeID") equals (string)c.Element("ID")                                                                                           
                          where (string)a.Element("EntityTypeID") == "" + entitytypeId + ""
                          select new {
                              AttributeID = a.Element("AttributeID").Value,
                              AttributeName = b.Element("Caption").Value,
                              AttributeDatatype = c.Element("DataType").Value,
                              AttributeSqltype = c.Element("SqlType").Value
                          };

---

如果有人给Linq lambda一个值得注意的查询..

我想把这个结果和“AttributeType_Table”元素“AttributeID”连接起来。@srinivasadari:请用这个代码更新你的问题。别忘了告诉我们你在这段代码中遇到了什么问题。我想把这个结果和“AttributeType_Table”元素“AttributeID”结合起来。@srinivasadari：请用这段代码更新你的问题。别忘了告诉我们你在代码中遇到了什么问题。