如何用匿名类型连接两个IEnumerables
本文关键字：两个 IEnumerables 何用匿 类型 连接 | 更新日期: 2023-09-27 18:04:52
我使用Linq-to-Xml创建两个IEnumerables，但我想将第二个列表的结果与第一个列表结合起来。当我使用.Concat()时，我得到以下错误:
'IQueryable<>'不包含'Concat'的定义，并且最佳扩展方法重载' parallelenumerable<>(ParallelQuery<>， IEnumerable<>)'需要一个类型为'ParallelQuery<>'的接收器
我试图.Concat()的两个列表在这里:
var findingDetails = from f in element.Elements(ns + "Group")
select new
{
testID = (string)f.Attribute("id").Value,
title = (string)f.Element(ns + "title"),
idrefFD = (string)f.Element(ns + "Rule").Attribute("id").Value,
severity = (string)f.Element(ns + "Rule").Attribute("severity").Value,
description = (string)f.Element(ns + "Rule").Element(ns + "description"),
fixText = (string)f.Element(ns + "Rule").Element(ns + "fixtext")
};
var getStatus = from gs in element.Descendants(ns + "rule-result")
select new
{
idrefStatus = (string)gs.Attribute("idref").Value,
result = (string)gs.Element(ns + "result"),
dateTime = (string)gs.Attribute("time")
};
在findingDetails使用中产生错误:
var combined = findingDetails.Concat(getStatus);
我想要得到的是一个var，它有findingDetails + getStatus.result和getStatus.dateTime的一切，在一个地方。这就是为什么我只需要迭代一个foreach()循环来访问所有的值，而不是使用嵌套的foreach()循环。
示例XML文档:
<?xml version="1.0" encoding="UTF-8"?>
<cdf:Benchmark style="SCAP_1.1" resolved="1" id="RHEL_6_STIG" xsi:schemaLocation="http://checklists.nist.gov/xccdf/1.1 http://nvd.nist.gov/schema/xccdf-1.1.4.xsd http://cpe.mitre.org/dictionary/2.0 http://scap.nist.gov/schema/cpe/2.2/cpe-dictionary_2.2.xsd" xmlns:cdf="http://checklists.nist.gov/xccdf/1.1" xmlns:cpe="http://cpe.mitre.org/dictionary/2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xhtml="http://www.w3.org/1999/xhtml">
<cdf:status date="2016-04-22">accepted</cdf:status>
<cdf:title>Red Hat Enterprise Linux 6 Security Technical Implementation Guide</cdf:title>
<cdf:description>The Red Hat Enterprise Linux 6 Security Technical Implementation Guide (STIG) is published as a tool to improve the security of Department of Defense (DoD) information systems. Comments or proposed revisions to this document should be sent via e-mail to the following address: disa.stig_spt@mail.mil.</cdf:description>
<cdf:notice id="terms-of-use"></cdf:notice>
<cdf:reference href="http://iase.disa.mil">
<dc:publisher>DISA</dc:publisher>
<dc:source>STIG.DOD.MIL</dc:source>
</cdf:reference>
<cdf:plain-text id="release-info">Release: 11 Benchmark Date: 22 Apr 2016</cdf:plain-text>
<cdf:platform idref="cpe:/o:redhat:enterprise_linux:6"></cdf:platform>
<cdf:version>1</cdf:version>
<cdf:Profile id="MAC-1_Classified">
<cdf:title>I - Mission Critical Classified</cdf:title>
</cdf:Profile>
<cdf:Value id="var_umask_for_daemons">
<cdf:title>daemon umask</cdf:title>
<cdf:description>Enter umask for daemons</cdf:description>
<cdf:value>022</cdf:value>
<cdf:value selector="022">022</cdf:value>
<cdf:value selector="027">027</cdf:value>
</cdf:Value>
<cdf:Group id="V-7055">
<cdf:title>APPNET0031 No Strong Name Verification</cdf:title>
<cdf:description><GroupDescription></GroupDescription></cdf:description>
<cdf:Rule weight="10.0" id="SV-7438r2_rule" severity="medium">
<cdf:version>APPNET0031</cdf:version>
<cdf:title>Digital signatures assigned to strongly named assemblies must be verified.</cdf:title>
<cdf:description><VulnDiscussion>A strong name consists of the assembly's identity, simple text name, version number, and culture information (if provided)—plus a public key and a digital signature. Strong names serve to identify the author of the code. If digital signatures used to sign strong name assemblies are not verified, any self signed code can be impersonated. This can lead to a loss of system integrity. </VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility>System Administrator</Responsibility><IAControls>DCSL-1</IAControls></cdf:description>
<cdf:reference>
<dc:publisher>DISA</dc:publisher>
<dc:identifier>2030</dc:identifier>
<dc:type>DPMS Target</dc:type>
</cdf:reference>
<cdf:fixtext fixref="F-12596r7_fix">Use regedit to remove the values stored in Windows registry key hKLM'Software'Microsoft'StrongName'Verification. There should be no assemblies or hash values listed under this registry key. All assemblies must require strong name verification in a production environment. Strong name assemblies that do not require verification in a development or test environment must have documented approvals from the IAO.</cdf:fixtext>
<cdf:fix id="F-12596r7_fix"></cdf:fix>
<cdf:check system="http://oval.mitre.org/XMLSchema/oval-definitions-5">
<cdf:check-content-ref href="U_Microsoft_DotNet_Framework_4_V1R4_STIG_SCAP_1-1_Benchmark-oval.xml" name="oval:mil.disa.fso.dotnet:def:2"></cdf:check-content-ref>
</cdf:check>
</cdf:Rule>
</cdf:Group>
<cdf:TestResult start-time="2016-07-20T11:59:59" version="1" test-system="cpe:/a:spawar:scc:4.1" end-time="2016-07-20T12:00:50" id="U_Microsoft_DotNet_Framework_4_V1R4_STIG_SCAP_1-1_Benchmark-xccdf.xml---MAC-2_Classified-1">
<cdf:benchmark href="U_Microsoft_DotNet_Framework_4_V1R4_STIG_SCAP_1-1_Benchmark-xccdf.xml"></cdf:benchmark>
<cdf:organization>SPAWAR Systems Center Atlantic</cdf:organization>
<cdf:identity privileged="true" authenticated="true">CCSAdmin</cdf:identity>
<cdf:profile idref="MAC-2_Classified"></cdf:profile>
<cdf:target>hostname</cdf:target>
<cdf:target-address>192.168.1.000</cdf:target-address>
<cdf:target-facts>
<cdf:fact name="urn:scap:fact:asset:identifier:host_name" type="string">hostname</cdf:fact>
<cdf:fact name="urn:scap:fact:asset:identifier:domain" type="string">.net</cdf:fact>
<cdf:fact name="urn:scap:fact:asset:identifier:fqdn" type="string">hostname.net</cdf:fact>
<cdf:fact name="urn:scap:fact:asset:identifier:os_name" type="string">Windows 7 Enterprise</cdf:fact>
<cdf:fact name="urn:scap:fact:asset:identifier:os_service_pack" type="string">Service Pack 1</cdf:fact>
<cdf:fact name="urn:scap:fact:asset:identifier:ipv4" type="string">192.168.1.000</cdf:fact>
</cdf:target-facts>
<cdf:platform idref="cpe:/a:microsoft:.net_framework:4.0"></cdf:platform>
<cdf:rule-result version="APPNET0031" time="2016-07-20T11:59:59" idref="SV-7438r2_rule" weight="10.0" severity="medium">
<cdf:result>pass</cdf:result>
<cdf:check system="http://oval.mitre.org/XMLSchema/oval-definitions-5">
<cdf:check-content-ref href="U_Microsoft_DotNet_Framework_4_V1R4_STIG_SCAP_1-1_Benchmark-oval.xml" name="oval:mil.disa.fso.dotnet:def:2"></cdf:check-content-ref>
</cdf:check>
</cdf:rule-result>
<cdf:rule-result version="APPNET0046" time="2016-07-20T11:59:59" idref="SV-7444r3_rule" weight="10.0" severity="medium">
<cdf:result>fail</cdf:result>
<cdf:fix id="F-12602r12_fix"></cdf:fix>
<cdf:check system="http://oval.mitre.org/XMLSchema/oval-definitions-5">
<cdf:check-content-ref href="U_Microsoft_DotNet_Framework_4_V1R4_STIG_SCAP_1-1_Benchmark-oval.xml" name="oval:mil.disa.fso.dotnet:def:15"></cdf:check-content-ref>
</cdf:check>
</cdf:rule-result>
</cdf:TestResult>
</cdf:Benchmark>
我改变了查询，现在看起来像这样:
var findingDetails = from f in element.Elements(ns + "Group")
select new
{
idrefStatus = (string)"",
result = (string)"",
dateTime = (string)"",
testID = (string)f.Attribute("id").Value,
title = (string)f.Element(ns + "title"),
idref = (string)f.Element(ns + "Rule").Attribute("id").Value,
severity = (string)f.Element(ns + "Rule").Attribute("severity").Value,
description = (string)f.Element(ns + "Rule").Element(ns + "description"),
fixText = (string)f.Element(ns + "Rule").Element(ns + "fixtext")
};
var getStatus = from gs in element.Descendants(ns + "rule-result")
select new
{
idrefStatus = (string)gs.Attribute("idref").Value,
result = (string)gs.Element(ns + "result"),
dateTime = (string)gs.Attribute("time"),
testID = (string)"",
title = (string)"",
idref = (string)"",
severity = (string)"",
description = (string)"",
fixText = (string)""
};
var combined = findingDetails.Concat(getStatus);
但是现在输出看起来像这样
foreach (var cf in combined)
{
Console.WriteLine(cf.idref + ", " + cf.result);
}
SV-7438r2_rule,
SV-7444r3_rule,
SV-40966r1_rule,
SV-41075r1_rule,
, pass
, fail
, pass
, pass
然而，我想得到这样的东西:
SV-7438r2_rule, pass
SV-7444r3_rule, fail
SV-40966r1_rule, pass
SV-41075r1_rule, pass
从您预期的输出("然而，我试图得到这样的东西:…")和您添加的数据似乎您正在寻找的是join而不是concat列表(concat将给您n*m记录)
这就是你要找的东西:
XNamespace ns = "http://checklists.nist.gov/xccdf/1.1";
var findingDetails = (from f in XDocument.Load("data.xml").Descendants(ns + "Group")
let rule = f.Element(ns + "Rule")
select new
{
testID = (string)f.Attribute("id").Value,
title = (string)f.Element(ns + "title"),
idref = (string)rule.Attribute("id").Value,
severity = (string)rule.Attribute("severity").Value,
description = (string)rule.Element(ns + "description"),
fixText = (string)rule.Element(ns + "fixtext")
}).ToList();
var getStatus = (from gs in XDocument.Load("data.xml").Descendants(ns + "rule-result")
select new
{
idrefStatus = (string)gs.Attribute("idref").Value,
result = (string)gs.Element(ns + "result"),
dateTime = (string)gs.Attribute("time"),
}).ToList();
var result = (from d in findingDetails
join f in getStatus on d.idref equals f.idrefStatus
select new { d, f }).ToList();
如果你的Group没有匹配的rule-result，那么使用left join代替
如果用完全相同的属性声明两个匿名类型，则可以将它们连接在一起。
你不能连接两个不同的类型，但你可以将它们强制转换为object，然后连接:
List<int> ints = new List<int>() { 1, 2, 3 };
List<string> strings = new List<string> { "a", "b", "c" };
ints.Cast<object>().Concat( strings.Cast<object>() );