迭代通過相同名稱的元素並通過另一個屬性值返回屬性

我試圖找到一個具有特定屬性值的特定元素，使用LINQ並返回另一個屬性值。如果我將要查找的元素的名稱更改爲唯一的元素並以此方式進行搜索，則會返回正確的值。我不能不幸地這樣做，因爲我無法控制XML格式。那麼，如何讓LINQ通過每個元素「行」並返回我正在尋找的屬性。迭代通過相同名稱的元素並通過另一個屬性值返回屬性

編輯：錯誤是空引用

的XML（樣本）：

<currentTime>2013-01-31 12:34:49</currentTime> 
    <result> 
    <rowset name="kills" key="killID" columns="killID,solarSystemID,killTime,moonID"> 
    <row killID="28024540" solarSystemID="30000967" killTime="2013-01-25 21:41:00" moonID="0"> 
    <victim characterID="888493667" characterName="Syrsyrian" corporationID="98152004" corporationName="Eviscerate." allianceID="0" allianceName="" factionID="0" factionName="" damageTaken="20220" shipTypeID="4306" /> 
    <rowset name="attackers" columns="characterID,characterName,corporationID,corporationName,allianceID,allianceName,factionID,factionName,securityStatus,damageDone,finalBlow,weaponTypeID,shipTypeID"> 
     <row characterID="1062593035" characterName="cal dasiri" corporationID="310281086" corporationName="Un4seen Development" allianceID="1566707582" allianceName="Republic Alliance" factionID="0" factionName="" securityStatus="5.00586641950613" damageDone="2286" finalBlow="1" weaponTypeID="2629" shipTypeID="24698" /> 
     <row characterID="0" characterName="" corporationID="98074388" corporationName="The New Lunar Republic" allianceID="0" allianceName="" factionID="0" factionName="" securityStatus="0" damageDone="9620" finalBlow="0" weaponTypeID="0" shipTypeID="17404" /> 
     <row characterID="584494552" characterName="Diesel24" corporationID="753753190" corporationName="Space-Bar" allianceID="1566707582" allianceName="Republic Alliance" factionID="0" factionName="" securityStatus="3.5" damageDone="2322" finalBlow="0" weaponTypeID="24702" shipTypeID="24702" /> 
     <row characterID="90905050" characterName="Thomas Shaefer" corporationID="187930037" corporationName="The Partisan Brigade" allianceID="1566707582" allianceName="Republic Alliance" factionID="0" factionName="" securityStatus="4.1" damageDone="1940" finalBlow="0" weaponTypeID="27315" shipTypeID="16227" /> 
     <row characterID="624484955" characterName="Full Penetration" corporationID="187930037" corporationName="The Partisan Brigade" allianceID="1566707582" allianceName="Republic Alliance" factionID="0" factionName="" securityStatus="3.1" damageDone="1788" finalBlow="0" weaponTypeID="27371" shipTypeID="16227" /> 
     <row characterID="1695597027" characterName="Algazi" corporationID="187930037" corporationName="The Partisan Brigade" allianceID="1566707582" allianceName="Republic Alliance" factionID="0" factionName="" securityStatus="1.5" damageDone="1258" finalBlow="0" weaponTypeID="1818" shipTypeID="24698" /> 
     <row characterID="92087835" characterName="Yasin Stavrouski" corporationID="310281086" corporationName="Un4seen Development" allianceID="1566707582" allianceName="Republic Alliance" factionID="0" factionName="" securityStatus="0.4" damageDone="561" finalBlow="0" weaponTypeID="8819" shipTypeID="587" /> 
     <row characterID="581357145" characterName="Nykitah" corporationID="187930037" corporationName="The Partisan Brigade" allianceID="1566707582" allianceName="Republic Alliance" factionID="0" factionName="" securityStatus="5" damageDone="445" finalBlow="0" weaponTypeID="24702" shipTypeID="24702" /> 
     <row characterID="92692957" characterName="Mokey PYD" corporationID="98153124" corporationName="Plots Your Demise" allianceID="0" allianceName="" factionID="0" factionName="" securityStatus="0" damageDone="0" finalBlow="0" weaponTypeID="5399" shipTypeID="594" /> 
     <row characterID="90511370" characterName="Rae'll" corporationID="187930037" corporationName="The Partisan Brigade" allianceID="1566707582" allianceName="Republic Alliance" factionID="0" factionName="" securityStatus="-0.4" damageDone="0" finalBlow="0" weaponTypeID="527" shipTypeID="670" /> 
    </rowset> 
    <rowset name="items" columns="typeID,flag,qtyDropped,qtyDestroyed,singleton"> 
     <row typeID="3090" flag="31" qtyDropped="0" qtyDestroyed="1" singleton="0" /> 
     <row typeID="31564" flag="94" qtyDropped="0" qtyDestroyed="1" singleton="0" />

和查詢：

XAttribute two = (from kd1 in loadkillData1.Elements("row") 
        where (string)kd1.Attribute("characterName") == "cal dasiri" 
        select kd1.Attribute("allianceName")).FirstOrDefault(); 

string derp2 = two.Value; 
label10.Content = derp2;

來源

2013-01-31 David Fitzpatrick

將來寫作時請注意格式化。它在可讀性方面有很大的不同。 –

那麼，目前的方法不能正確工作？ – JLRishe

你確定你在枚舉內部'row'元素，而不是單個封閉'row'元素嗎？ – paul

要獲得row所有情況下，使用xd.Descendants()

XAttribute two = (from kd1 in xd.Descendants("row") 
        where (string)kd1.Attribute("characterName") == "cal dasiri" 
        select kd1.Attribute("allianceName")).FirstOrDefault();

來源

2013-01-31 15:22:28 JLRishe

在該LINQ查詢中不需要進行類型轉換。你可以簡單地做kd1.Attribute（「characterName」）。它是XAttribute的標準get屬性，並且是處理它的首選方法。 – Magnum

@Magnum'kd1.Attribute（「characterName」）。Value'將產生一個'NullReferenceException'，用於沒有'characterName'屬性的行（並且在示例XML中有幾行這樣的行）。字符串強制轉換不存在此問題。 – JLRishe

迭代通過相同名稱的元素並通過另一個屬性值返回屬性

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