XmlDocument.SelectNodes找不到笔记（C＃）

我在使用XmlDocument.SelectNodes解析XML文档时遇到问题。我试图解析XML文档下面是：XmlDocument.SelectNodes找不到笔记（C＃）

<ArrayOfSearchLyricResult xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns="http://api.chartlyrics.com/"> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>2d9e0cae0445e5e483edfe140d89c9f3</LyricChecksum> 
     <LyricId>103</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/DhNJp9jCfEq3QJCOpFdJYQ/You+Sexy+Thing.aspx </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/DhNJp9jCfEq3QJCOpFdJYQ.aspx 
     </ArtistUrl> 
     <Artist>Hot Chocolate</Artist> 
     <Song>You Sexy Thing</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>8101c7b585e1a4bf0703604e21203b08</LyricChecksum> 
     <LyricId>299</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/BDhOYTR9ukGFf4EbrXwreg/Sultans+of+Swing.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/BDhOYTR9ukGFf4EbrXwreg.aspx 
     </ArtistUrl> 
     <Artist>Dire Straits</Artist> 
     <Song>Sultans of Swing</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>7ca62310384a876bfd77cb5973eea84f</LyricChecksum> 
     <LyricId>476</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/bTsqWSvEZ0WZyez2O9ZkmQ/Johnny+B.+Goode.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/bTsqWSvEZ0WZyez2O9ZkmQ.aspx 
     </ArtistUrl> 
     <Artist>Chuck Berry</Artist> 
     <Song>Johnny B. Goode</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>2db7cbd379f393f1cc2db14b0e090890</LyricChecksum> 
     <LyricId>331</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/dSNGSwjFKkOMiM7uw4sWrg/Kids+in+America.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/dSNGSwjFKkOMiM7uw4sWrg.aspx 
     </ArtistUrl> 
     <Artist>Kim Wilde</Artist> 
     <Song>Kids in America</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>fdfe0c7fa58cc330f5f65c07d51bc223</LyricChecksum> 
     <LyricId>290</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/jFWSj6orWEeMOGFVGene2g/London+Calling.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/jFWSj6orWEeMOGFVGene2g.aspx 
     </ArtistUrl> 
     <Artist>The Clash</Artist> 
     <Song>London Calling</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>08ae7d63ce44d9c844e012df821cc8dd</LyricChecksum> 
     <LyricId>518</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/_fHX8YOI6UetK-nsn_YarA/Soul+Man.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/_fHX8YOI6UetK-nsn_YarA.aspx 
     </ArtistUrl> 
     <Artist>Sam & Dave</Artist> 
     <Song>Soul Man</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>afd610c96ee6fed3a1339d4bb0ff03a2</LyricChecksum> 
     <LyricId>1149</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/rIJkhMTUhkKAArFKYB2OwA/Car+Wash.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/rIJkhMTUhkKAArFKYB2OwA.aspx 
     </ArtistUrl> 
     <Artist>Rose Royce</Artist> 
     <Song>Car Wash</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>9b26935781b09651067d568879d16fb1</LyricChecksum> 
     <LyricId>342</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/soiNZ7CHO0C2PV2nRlrsww/Immigrant+Song.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/soiNZ7CHO0C2PV2nRlrsww.aspx 
     </ArtistUrl> 
     <Artist>Led Zeppelin</Artist> 
     <Song>Immigrant Song</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>7640651d7b769712fcd7fa7240b71bb6</LyricChecksum> 
     <LyricId>163</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/vYsnIBonHEq2_UOhPUMgPQ/Video+Killed+the+Radio+Star.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/vYsnIBonHEq2_UOhPUMgPQ.aspx 
     </ArtistUrl> 
     <Artist>The Buggles</Artist> 
     <Song>Video Killed the Radio Star</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>9266af12dd9157562b7c707b53f3bdc3</LyricChecksum> 
     <LyricId>4342</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/LXMjzdL_TkSIhFNHXXrH2Q/The+Power.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/LXMjzdL_TkSIhFNHXXrH2Q.aspx 
     </ArtistUrl> 
     <Artist>Snap!</Artist> 
     <Song>The Power</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>3986a113157b0ac33d0aed5656fd9f06</LyricChecksum> 
     <LyricId>940</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/cNVr9GhXLka4TMfJk7v0fg/Life+in+the+Fast+Lane.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/cNVr9GhXLka4TMfJk7v0fg.aspx 
     </ArtistUrl> 
     <Artist>Eagles</Artist> 
     <Song>Life in the Fast Lane</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>f40ac8bae81540469ead55d0cf57b7a1</LyricChecksum> 
     <LyricId>1588</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/yxjb5R9LbUmjCFSLYRCQ0w/Anarchy+in+the+UK.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/yxjb5R9LbUmjCFSLYRCQ0w.aspx 
     </ArtistUrl> 
     <Artist>Sex Pistols</Artist> 
     <Song>Anarchy in the UK</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>e8a984143781f4bb95427b249e6edf3a</LyricChecksum> 
     <LyricId>2451</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/lxqWV5Y390ufAqmFqJea6Q/Bomber.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/lxqWV5Y390ufAqmFqJea6Q.aspx 
     </ArtistUrl> 
     <Artist>Motörhead</Artist> 
     <Song>Bomber</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>95b7f4c731ea5a422e480eff154a8e6d</LyricChecksum> 
     <LyricId>3623</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/_LsLsZ7P4EK-F-LD4dJgDQ/Helter+Skelter.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/_LsLsZ7P4EK-F-LD4dJgDQ.aspx 
     </ArtistUrl> 
     <Artist>The Beatles</Artist> 
     <Song>Helter Skelter</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>3a77790cede59201622ac25b301ce87d</LyricChecksum> 
     <LyricId>4293</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/XdO8JqNWTU6K13vFeHw68Q/Let%27s+Talk+About+Sex.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/XdO8JqNWTU6K13vFeHw68Q.aspx 
     </ArtistUrl> 
     <Artist>Salt-N-Pepa</Artist> 
     <Song>Let's Talk About Sex</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>728c12ddcc6381fd404d2f6bc50dbce2</LyricChecksum> 
     <LyricId>3305</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/xmpyap4BXEWLu1cad77VLg/Jailbreak.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/xmpyap4BXEWLu1cad77VLg.aspx 
     </ArtistUrl> 
     <Artist>Thin Lizzy</Artist> 
     <Song>Jailbreak</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>e651913c110a126e60cbd9673ff8fafe</LyricChecksum> 
     <LyricId>3068</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/rV4f_rbSpkqgjcx2-HfBYA/It%27s+Like+That.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/rV4f_rbSpkqgjcx2-HfBYA.aspx 
     </ArtistUrl> 
     <Artist>Run-D.M.C. vs. Jason Nevins</Artist> 
     <Song>It's Like That</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>717d198977d72d5b0981082a3e332034</LyricChecksum> 
     <LyricId>8880</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/NhBOlAOKEUaKoDFRWgXISA/All+Star.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/NhBOlAOKEUaKoDFRWgXISA.aspx 
     </ArtistUrl> 
     <Artist>Smash Mouth</Artist> 
     <Song>All Star</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>c8032ddab104a0bb786587d17a396010</LyricChecksum> 
     <LyricId>3819</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/YJ5WLxsKuU-VpD3BUl0arQ/Quit+Playing+Games+(With+My+Heart).aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/YJ5WLxsKuU-VpD3BUl0arQ.aspx 
     </ArtistUrl> 
     <Artist>Backstreet Boys</Artist> 
     <Song>Quit Playing Games (With My Heart)</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>0d4a8b407079cdb30f5a5a3f6ee8f974</LyricChecksum> 
     <LyricId>113</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/osJmpBdl-0KhYBCHw7r9nw/Spit+It+Out.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/osJmpBdl-0KhYBCHw7r9nw.aspx 
     </ArtistUrl> 
     <Artist>Slipknot</Artist> 
     <Song>Spit It Out</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>34e4fdc09aab81fbd42170f3e83e7d50</LyricChecksum> 
     <LyricId>1307</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/wqtScsjfpkqIny0WiyZUAw/Soul+Man.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/wqtScsjfpkqIny0WiyZUAw.aspx 
     </ArtistUrl> 
     <Artist>Blues Brothers</Artist> 
     <Song>Soul Man</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>b632cdcbd6ea0001c182ecbe24cff241</LyricChecksum> 
     <LyricId>2270</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/n5ATvSkcJ0yodNSq8nxbGg/Sara.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/n5ATvSkcJ0yodNSq8nxbGg.aspx 
     </ArtistUrl> 
     <Artist>Fleetwood Mac</Artist> 
     <Song>Sara</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>202f72eb5b3d005bcb1d6543157c3224</LyricChecksum> 
     <LyricId>6742</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/2cGCUdLHrU2voMz-rakhqA/The+Mob+Rules.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/2cGCUdLHrU2voMz-rakhqA.aspx 
     </ArtistUrl> 
     <Artist>Black Sabbath</Artist> 
     <Song>The Mob Rules</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>34abefd904136d0c38ac2eeaf16a3c8c</LyricChecksum> 
     <LyricId>1496</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/a2v_0jD83EiJUgb52Pxk-A/School.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/a2v_0jD83EiJUgb52Pxk-A.aspx 
     </ArtistUrl> 
     <Artist>Supertramp</Artist> 
     <Song>School</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult> 
     <TrackId>0</TrackId> 
     <LyricChecksum>930814c7dd18af406703a465c8529628</LyricChecksum> 
     <LyricId>1679</LyricId> 
     <SongUrl> 
    http://www.chartlyrics.com/iML6i8XMjUSVc8M-oqpcMA/Can%27t+Stop.aspx 
     </SongUrl> 
     <ArtistUrl> 
    http://www.chartlyrics.com/iML6i8XMjUSVc8M-oqpcMA.aspx 
     </ArtistUrl> 
     <Artist>Red Hot Chili Peppers</Artist> 
     <Song>Can't Stop</Song> 
     <SongRank>9</SongRank> 
    </SearchLyricResult> 
    <SearchLyricResult xsi:nil="true"/> 
</ArrayOfSearchLyricResult>

我的代码是：

{ 
    string apiurl = "http://api.chartlyrics.com/apiv1.asmx/SearchLyricText?lyricText="; 
    string lyric = System.Net.WebUtility.UrlEncode(input); 
    var myList = new List<string>(); 
    XmlDocument xmlDoc = new XmlDocument(); 
    XmlNamespaceManager ns = new XmlNamespaceManager(xmlDoc.NameTable); 
    ns.AddNamespace("ns", "http://api.chartlyrics.com/"); 
    xmlDoc.Load(apiurl + lyric); 
    XmlNodeList songs = xmlDoc.SelectNodes("//SearchLyricResult", ns); 
    foreach (XmlNode song in songs) 
    { 
     XmlNode artistNode = song.SelectSingleNode("Artist"); 
     XmlNode songNode = song.SelectSingleNode("Song"); 
     if ((artistNode != null) && (songNode != null)) 
      myList.Add(artistNode.InnerText + " - " + songNode.InnerText); 
    } 
    var results = myList.ToArray(); 
    return results; 
}

在我的各种谷歌搜索，我发现XmlNamespaceManager的一些技巧害得我在添加到代码，但这并没有太大的帮助。我相信这个问题出现在我的XPath中，因为当我使用//*节点时，我的foreach循环运行，但我没有从SelectSingleNode行获得任何东西。在添加命名空间之前，//*没有运行，所以有进展。我已经试过的XPath是：
//ArrayOfSearchLyricResult/SearchLyricResult //返回什么
//SearchLyricResult //返回什么
//* //返回一切
预先感谢任何帮助。

来源

2017-06-20 NostraThomas

您已经做了正确的事情并为您的查询创建了名称空间管理器，但您必须实际使用您定义的名称空间前缀。

这应该给你你期待的结果：

XmlNodeList songs = xmlDoc.SelectNodes("/ns:ArrayOfSearchLyricResult/ns:SearchLyricResult", ns); 
foreach (XmlNode song in songs) 
{ 
    XmlNode artistNode = song.SelectSingleNode("ns:Artist", ns); 
    XmlNode songNode = song.SelectSingleNode("ns:Song", ns); 
    if ((artistNode != null) && (songNode != null)) 
     myList.Add(artistNode.InnerText + " - " + songNode.InnerText); 
}

来源

2017-06-20 14:43:31 JLRishe

就是这样。谢谢！我知道这是我忽略的非常简单的事情。有一件事，我必须改变（“ns：Artist”）和（“ns：Song”）到（“ns：Artist”，ns）和（“ns：Song”，ns）。否则就会抛出异常。 – NostraThomas

@NostraThomas好的。您需要在XPath使用名称空间的任何时候传递'ns'。 – JLRishe

也有一个类似的question。我想也可以帮忙，祝你有美好的一天！

{ 
    string apiurl = "http://api.chartlyrics.com/apiv1.asmx/SearchLyricText?lyricText="; 
    string lyric = System.Net.WebUtility.UrlEncode(input); 
    var myList = new List<string>(); 

    XmlDocument xmlDoc = new XmlDocument(); 
    XmlNamespaceManager ns = new XmlNamespaceManager(xmlDoc.NameTable); 
    ns.AddNamespace("ns", "http://api.chartlyrics.com/"); 
    xmlDoc.Load(apiurl + lyric); 

    //I'd change this part only 
    XmlNodeList searchResult = xmlDoc.SelectNodes("/ns:ArrayOfSearchLyricResult/ns:SearchLyricResult", ns) 
    foreach (XmlNode item in searchResult) 
    { 
     if (item != null) 
     { 
     myList.Add(item["Artist"].InnerText + " - " + example["Song"].InnerText;); 
     } 
    } 

    var results = myList.ToArray(); 
    return results; 
}

来源

2017-06-20 15:12:50

XmlDocument.SelectNodes找不到笔记（C＃）

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