How to read and update XML file with Key and values using c#

Question

User649011760 posted

Hi,

I want to read all nodes under '<appSettings>'  display key and values in windows form. How to read key and value  from below XML file using c#.

I want to update few items under '<appSettings>' for example: I want to change the  <add key="name" value="testUser"/> to <add key key="name" value="Admin"/>, how to change using c#.

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="IsAdmin" value="true" />
    <add key="name" value="testUser" />
    <add key="password" value="testpassword" />
    <add key="Country" value="Canada"/>
  </appSettings>

</configuration>

Thanks,

Answer 1

User2103319870 posted

I want to read all nodes under '<appSettings>'  display key and values in windows form. How to read key and value  from below XML file using c#.

You can use ConfigurationManager.AppSettings property to read the appsettngs values

public class ConfigValue
		{
			public string Key { get; set; }
			public string Value { get; set; }
		}

		private void button1_Click(object sender, EventArgs e)
		{
			List<ConfigValue> lst1 = new List<ConfigValue>();
			//Read appsettings
			var appSettings = ConfigurationManager.AppSettings;
			//loop through each value
			foreach (var key in appSettings.AllKeys)
			{
				ConfigValue configValue = new ConfigValue();
				configValue.Key = key;
				configValue.Value = appSettings[key];
				lst1.Add(configValue);
			}
			//assign to datagridview control
			dataGridView1.DataSource = lst1;
			
		}

For more details : https://docs.microsoft.com/en-us/dotnet/api/system.configuration.configurationmanager.appsettings?view=dotnet-plat-ext-3.1

Answer 2

User649011760 posted

Thanks for Replay, Can you please let me know how to read & update external config file using c#.

Answer 3

User475983607 posted

Thanks for Replay, Can you please let me know how to read & update external config file using c#.

.NET comes with very robust XML file APIs.  

https://docs.microsoft.com/en-us/dotnet/standard/linq/load-xml-file

Set aside some time to learn how to use the APIs.  

You can also Google a solution...

https://www.google.com/search?q=update+app.config+appsettings+programmatically+c%23