How can we add list or multiple values for a single key in web.config in asp .net

问题

How can we add list or multiple values for a single key in web.config?

For example: I have key named "xyz" it has a list of values, that is , val1, val2, val3 etc.

And this can be obtained in my code as other keys are accessible.

回答1:

Add in web config as comma separated valued like

<add key = "xyz" value="val1, val2, val3"/>

access them as

  string[]  xyzValues = System.Configuration.ConfigurationManager.AppSettings["xyz"].Split(",");

回答2:

You can't do it directly but with a little more coding you may have custom config section in your config files. https://msdn.microsoft.com/en-us/library/2tw134k3.aspx link describes how to do custom config.

Other way could be use a separator in value and define multiple values and then use that values using split function(like other have mentioned)

回答3:

Define a separator character.

Then, get the application setting by its key and use string.Split to get those multiple values as an array or IEnumerable<string>:

IEnumerable<string> values = ConfigurationManager.AppSettings["xyz"].Split(',');

回答4:

You can use the appsettings tag

<appSettings>
  <add key="xyz" value="val1;val2;val3" />
</appSettings>

C# Code

string[] values = ConfigurationManager.AppSettings["xyz"].Split(';');

来源：https://stackoverflow.com/questions/32737620/how-can-we-add-list-or-multiple-values-for-a-single-key-in-web-config-in-asp-ne