How to change XML Attribute

Question

How can I change an attribute of an element in an XML file  using C

User · Answer

Using LINQ to xml if you are using framework 3 5   using System Xml Linq   XDocument xmlFile   XDocument Load  books xml      var query   from c in xmlFile Elements  catalog   Elements  book                   select c    foreach  XElement book in query        book Attribute  attr1   Value    MyNewValue      xmlFile Save  books xml

User · Answer

If the attribute you want to change doesn t exist or has been accidentally removed  then an exception occurs  I suggest you first create a new attribute and send it to a function like the following   private void SetAttrSafe XmlNode node params XmlAttribute   attrList                foreach  var attr in attrList                        if  node Attributes attr Name     null                                node Attributes attr Name  Value   attr Value                            else                               node Attributes Append attr                                   Usage      XmlAttribute attr   dom CreateAttribute  name       attr Value   value     SetAttrSafe node  attr

User · Answer

Mike        Everytime I need to modify an XML document I work it this way     Here is the variable with which you assign a new value to the attribute string newValue   string Empty  XmlDocument xmlDoc   new XmlDocument     xmlDoc Load xmlFile    XmlNode node   xmlDoc SelectSingleNode  Root Node Element    node Attributes 0  Value   newValue   xmlDoc Save xmlFile      xmlFile is the path of your file to be modified   I hope you find it useful

User · Answer

Mike        Everytime I need to modify an XML document I work it this way     Here is the variable with which you assign a new value to the attribute string newValue   string Empty  XmlDocument xmlDoc   new XmlDocument     xmlDoc Load xmlFile    XmlNode node   xmlDoc SelectSingleNode  Root Node Element    node Attributes 0  Value   newValue   xmlDoc Save xmlFile      xmlFile is the path of your file to be modified   I hope you find it useful

User · Answer

If the attribute you want to change doesn t exist or has been accidentally removed  then an exception occurs  I suggest you first create a new attribute and send it to a function like the following   private void SetAttrSafe XmlNode node params XmlAttribute   attrList                foreach  var attr in attrList                        if  node Attributes attr Name     null                                node Attributes attr Name  Value   attr Value                            else                               node Attributes Append attr                                   Usage      XmlAttribute attr   dom CreateAttribute  name       attr Value   value     SetAttrSafe node  attr

User · Answer

Using LINQ to xml if you are using framework 3 5   using System Xml Linq   XDocument xmlFile   XDocument Load  books xml      var query   from c in xmlFile Elements  catalog   Elements  book                   select c    foreach  XElement book in query        book Attribute  attr1   Value    MyNewValue      xmlFile Save  books xml

User · Answer

Mike        Everytime I need to modify an XML document I work it this way     Here is the variable with which you assign a new value to the attribute string newValue   string Empty  XmlDocument xmlDoc   new XmlDocument     xmlDoc Load xmlFile    XmlNode node   xmlDoc SelectSingleNode  Root Node Element    node Attributes 0  Value   newValue   xmlDoc Save xmlFile      xmlFile is the path of your file to be modified   I hope you find it useful

User · Answer

Using LINQ to xml if you are using framework 3 5   using System Xml Linq   XDocument xmlFile   XDocument Load  books xml      var query   from c in xmlFile Elements  catalog   Elements  book                   select c    foreach  XElement book in query        book Attribute  attr1   Value    MyNewValue      xmlFile Save  books xml

User · Answer

Mike        Everytime I need to modify an XML document I work it this way     Here is the variable with which you assign a new value to the attribute string newValue   string Empty  XmlDocument xmlDoc   new XmlDocument     xmlDoc Load xmlFile    XmlNode node   xmlDoc SelectSingleNode  Root Node Element    node Attributes 0  Value   newValue   xmlDoc Save xmlFile      xmlFile is the path of your file to be modified   I hope you find it useful

User · Answer

Using LINQ to xml if you are using framework 3 5   using System Xml Linq   XDocument xmlFile   XDocument Load  books xml      var query   from c in xmlFile Elements  catalog   Elements  book                   select c    foreach  XElement book in query        book Attribute  attr1   Value    MyNewValue      xmlFile Save  books xml

User · Answer

Here s the beginnings of a parser class to get you started   This ended up being my solution to a similar problem   using System  using System Collections Generic  using System Linq  using System Text  using System Threading Tasks  using System Xml Linq   namespace XML       public class Parser                private string  FilePath   string Empty           private XDocument  XML Doc   null            public Parser string filePath                         FilePath   filePath               XML Doc   XDocument Load  FilePath                            lt summary gt              Replaces values of all attributes of a given name  attributeName  with the specified new value  newValue  in all elements               lt  summary gt               lt param name  attributeName  gt  lt  param gt               lt param name  newValue  gt  lt  param gt          public void ReplaceAtrribute string attributeName  string newValue                        ReplaceAtrribute string Empty  attributeName  new List lt string gt       newValue                           lt summary gt              Replaces values of all attributes of a given name  attributeName  with the specified new value  newValue  in elements with a given name  elementName                lt  summary gt               lt param name  elementName  gt  lt  param gt               lt param name  attributeName  gt  lt  param gt               lt param name  newValue  gt  lt  param gt          public void ReplaceAtrribute string elementName  string attributeName  string newValue                        ReplaceAtrribute elementName  attributeName  new List lt string gt       newValue                            lt summary gt              Replaces values of all attributes of a given name  attributeName  and value  oldValue                with the specified new value  newValue  in elements with a given name  elementName                lt  summary gt               lt param name  elementName  gt  lt  param gt               lt param name  attributeName  gt  lt  param gt               lt param name  oldValue  gt  lt  param gt               lt param name  newValue  gt  lt  param gt          public void ReplaceAtrribute string elementName  string attributeName  string oldValue  string newValue                        ReplaceAtrribute elementName  attributeName  new List lt string gt    oldValue    newValue                                          lt summary gt              Replaces values of all attributes of a given name  attributeName   which has one of a list of values  oldValues                with the specified new value  newValue  in elements with a given name  elementName               If oldValues is empty then oldValues will be ignored               lt  summary gt               lt param name  elementName  gt  lt  param gt               lt param name  attributeName  gt  lt  param gt               lt param name  oldValues  gt  lt  param gt               lt param name  newValue  gt  lt  param gt          public void ReplaceAtrribute string elementName  string attributeName  List lt string gt  oldValues  string newValue                        List lt XElement gt  elements    XML Doc Elements   Descendants   ToList                 foreach  XElement element in elements                                if  elementName    string Empty   element Name LocalName ToString      elementName                                        if  element Attribute attributeName     null                                                 if  oldValues Count    0    oldValues Contains element Attribute attributeName  Value                             element Attribute attributeName  Value   newValue                                                                              public void SaveChangesToFile                          XML Doc Save  FilePath

User · Answer

Here s the beginnings of a parser class to get you started   This ended up being my solution to a similar problem   using System  using System Collections Generic  using System Linq  using System Text  using System Threading Tasks  using System Xml Linq   namespace XML       public class Parser                private string  FilePath   string Empty           private XDocument  XML Doc   null            public Parser string filePath                         FilePath   filePath               XML Doc   XDocument Load  FilePath                            lt summary gt              Replaces values of all attributes of a given name  attributeName  with the specified new value  newValue  in all elements               lt  summary gt               lt param name  attributeName  gt  lt  param gt               lt param name  newValue  gt  lt  param gt          public void ReplaceAtrribute string attributeName  string newValue                        ReplaceAtrribute string Empty  attributeName  new List lt string gt       newValue                           lt summary gt              Replaces values of all attributes of a given name  attributeName  with the specified new value  newValue  in elements with a given name  elementName                lt  summary gt               lt param name  elementName  gt  lt  param gt               lt param name  attributeName  gt  lt  param gt               lt param name  newValue  gt  lt  param gt          public void ReplaceAtrribute string elementName  string attributeName  string newValue                        ReplaceAtrribute elementName  attributeName  new List lt string gt       newValue                            lt summary gt              Replaces values of all attributes of a given name  attributeName  and value  oldValue                with the specified new value  newValue  in elements with a given name  elementName                lt  summary gt               lt param name  elementName  gt  lt  param gt               lt param name  attributeName  gt  lt  param gt               lt param name  oldValue  gt  lt  param gt               lt param name  newValue  gt  lt  param gt          public void ReplaceAtrribute string elementName  string attributeName  string oldValue  string newValue                        ReplaceAtrribute elementName  attributeName  new List lt string gt    oldValue    newValue                                          lt summary gt              Replaces values of all attributes of a given name  attributeName   which has one of a list of values  oldValues                with the specified new value  newValue  in elements with a given name  elementName               If oldValues is empty then oldValues will be ignored               lt  summary gt               lt param name  elementName  gt  lt  param gt               lt param name  attributeName  gt  lt  param gt               lt param name  oldValues  gt  lt  param gt               lt param name  newValue  gt  lt  param gt          public void ReplaceAtrribute string elementName  string attributeName  List lt string gt  oldValues  string newValue                        List lt XElement gt  elements    XML Doc Elements   Descendants   ToList                 foreach  XElement element in elements                                if  elementName    string Empty   element Name LocalName ToString      elementName                                        if  element Attribute attributeName     null                                                 if  oldValues Count    0    oldValues Contains element Attribute attributeName  Value                             element Attribute attributeName  Value   newValue                                                                              public void SaveChangesToFile                          XML Doc Save  FilePath

[c#] How to change XML Attribute

Examples related to c#

Examples related to xml

Examples related to linq-to-xml

Examples related to xmldocument