Adding new key into web.config file using c# : The Official Microsoft ASP.NET Forums

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YairNevet

Member

96 Points

Adding new key into web.config file using c#

Dec 08, 2008 03:01 PM|LINK

Hi all,

I have the following method which is basically supposed to ADD a new key-value pair into my web.config file each time it's called but instead it's UPDATE the existent values at position [0] [1]:

static public void InsertKeyValuePair(string key, string value)
{
 XmlDocument doc = new XmlDocument();
 doc.Load("Web.config");


 XmlNodeList nodeList = doc.GetElementsByTagName("appSettings");
 XmlNodeList nodeAppSettings = nodeList[0].ChildNodes;


 XmlAttributeCollection xmlAttCollection = nodeAppSettings[0].Attributes;
 xmlAttCollection[0].InnerXml = key;
 xmlAttCollection[1].InnerXml = value;


 doc.Save("Web.config");
}

What can I do in order to ADD and not to UPDATE?

Yair Nevet
Microsoft MCAD.NET

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donchevp

Participant

1216 Points

228 Posts

Re: Adding new key into web.config file using c#

Dec 08, 2008 03:22 PM|LINK

static public void InsertKeyValuePair(string key, string value)
{
 XmlDocument doc = new XmlDocument();
 doc.Load("Web.config");


// This should find the appSettings node (should be only one):
 XmlNode nodeAppSettings = doc.SelectSingleNode("//appSettings");


// Create new <add> node
XmlNode nodeNewKey = doc.CreateElement("add");


// Create new attribute for key=""
XmlAttribute attributeKey = doc.CreateAttribute("key");
// Create new attribute for value=""
XmlAttribute attributeValue = doc.CreateAttribute("value");


// Assign values to both - the key and the value attributes:


attributeKey.value = "myKey";
attributeValue.value = "myValue";


// Add both attributes to the newly created node:
nodeNewKey.Attributes.Append(attributeKey);
nodeNewKey.Attributes.Append(attributeValue);


// Add the node under the 
nodeAppSettings.ChildNodes.Add(nodeNewKey);
 doc.Save("Web.config");
}

I think there was a Configuration manager class to handle this. Not quite sure. Check the System.Configuration and System.Web.Configuration namespaces.

If you really need to add a key using XmlDocument you can do it this way:

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Marked as answer by Samu Zhang - MSFT on Dec 12, 2008 06:09 AM

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YairNevet

Member

96 Points

181 Posts

Re: Adding new key into web.config file using c#

Dec 08, 2008 04:12 PM|LINK

Thank you Calibre!

Yair Nevet
Microsoft MCAD.NET

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donchevp

Participant

1216 Points

228 Posts

Re: Adding new key into web.config file using c#

Dec 09, 2008 06:46 AM|LINK

Can you please mark so other guys know what solved your problem?

Thanks,

Pavel

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My Blog

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YairNevet

Member

96 Points

181 Posts

Re: Adding new key into web.config file using c#

Dec 09, 2008 07:58 AM|LINK

Hi Pavel,

Before i'm approving your message as helped one, can you please tell me how can I replace a node in the AppSettings section?

For instance, if I need to replace: <add key="Age" value="24"> in <add key="Age" value="25">

How?

Yair Nevet
Microsoft MCAD.NET

Edited by YairNevet on Dec 09, 2008 07:15 PM

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donchevp

Participant

1216 Points

228 Posts

Re: Adding new key into web.config file using c#

Dec 09, 2008 01:21 PM|LINK

Sure.

Something like this should work:

static public void InsertKeyValuePair(string key, string value)
    {
      XmlDocument doc = new XmlDocument();
      doc.Load("Web.config");
    

      // This should find the appSettings node (should be only one):
      XmlNode keyAge = doc.SelectSingleNode("//appSettings/add[@key='age']");
      keyAge.Attributes["value"].Value = "25";
      doc.Save("Web.config");
     }

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