How do I check particular attributes exist or not in XML

Question

Part of the XML content    lt section name  Header  gt     lt placeholder name  HeaderPane  gt  lt  placeholder gt   lt  section gt    lt section name  Middle  split  20  gt     lt placeholder name  ContentLeft   gt  lt  placeholder gt     lt placeholder name  ContentMiddle  gt  lt  placeholder gt     lt placeholder name  ContentRight  gt  lt  placeholder gt   lt  section gt    lt section name  Bottom  gt     lt placeholder name  BottomPane  gt  lt  placeholder gt   lt  section gt    I want to check in each node and if attribute split exist  try to assign an attribute value in a variable   Inside a loop  I try   foreach  XmlNode xNode in nodeListName        if xNode ParentNode Attributes  split   Value                      parentSplit   xNode ParentNode Attributes  split   Value            But I m wrong if the condition checks only the value  not the existence of attributes  How should I check for the existence of attributes

User · Answer

Another way to handle the situation is exception handling.

Every time a non-existent value is called, your code will recover from the exception and just continue with the loop. In the catch-block you can handle the error the same way you write it down in your else-statement when the expression (... != null) returns false. Of course throwing and handling exceptions is a relatively costly operation which might not be ideal depending on the performance requirements.

User · Answer

You can actually index directly into the Attributes collection  if you are using C  not VB    foreach  XmlNode xNode in nodeListName      XmlNode parent   xNode ParentNode    if  parent Attributes    null       amp  amp  parent Attributes  split      null           parentSplit   parent Attributes  split   Value

User · Answer

var splitEle   xn Attributes  split     if  splitEle   null       return splitEle  Value

User · Answer

Just for the newcomers  the recent versions of C  allows the use of   operator to check nulls assignments  parentSplit   xNode ParentNode Attributes  split    Value

User · Answer

You can use the GetNamedItem method to check and see if the attribute is available  If null is returned  then it isn t available  Here is your code with that check in place   foreach  XmlNode xNode in nodeListName        if xNode ParentNode Attributes GetNamedItem  split      null                 if xNode ParentNode Attributes  split   Value                              parentSplit   xNode ParentNode Attributes  split   Value

User · Answer

EDIT  Disregard - you can t use ItemOf  that s what I get for typing before I test    I d strikethrough the text if I could figure out how   or maybe I ll simply delete the answer  since it was ultimately wrong and useless   END EDIT  You can use the ItemOf string  property in the XmlAttributesCollection to see if the attribute exists   It returns null if it s not found   foreach  XmlNode xNode in nodeListName        if  xNode ParentNode Attributes ItemOf  split      null                 parentSplit   xNode ParentNode Attributes  split   Value            XmlAttributeCollection ItemOf Property  String

User · Answer

You can use LINQ nbsp to nbsp XML   XDocument doc   XDocument Load file    var result    from ele in doc Descendants  section                 select ele  ToList     foreach  var t in result        if  t Attributes  split   Count      0                   Exist               Suggestion from  UrbanEsc     if t Attributes  split   Any                     OR   XDocument doc   XDocument Load file     var result    from ele in doc Descendants  section   Attributes  split                  select ele  ToList      foreach  var t in result             Response Write   lt br  gt      t Value

User · Answer

If your code is dealing with XmlElements objects  rather than XmlNodes  then there is the method XmlElement HasAttribute string name    So if you are only looking for attributes on elements  which it looks like from the OP  then it may be more robust to cast as an element  check for null  and then use the HasAttribute method   foreach  XmlNode xNode in nodeListName      XmlElement xParentEle   xNode ParentNode as XmlElement    if  xParentEle    null   amp  amp  xParentEle HasAttribute  split             parentSplit   xParentEle Attributes  split   Value

[c#] How do I check particular attributes exist or not in XML?

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