如何将值从web.config应用程序密钥获取到列表

Question

I have the following in my web.config:

<add key="someValuestoReturn" value="60,59,58,57,56"/>

I want to return a list of this integer values into my my method but i'm having a difficult to call the list of the values from the web.config:

    Private int GetValues(){

    var _list = System.Configuration.ConfigurationManager.AppSettings["someValuestoReturn"].ToList();  //<< doesn't work

return _list
    }

What would be the best way to achieve this?

Thank you

Answer 1

I might suggest you to solve this on another way..

lets first create an a empty list of a strings which we are going later to put into an array:

After that we need to find your key and we need to get values from a key into our new created list, but we must take care about spliting because your values are comma separated, so check my code below:

List<string> values = new List<string>();

foreach (string key in ConfigurationManager.AppSettings)
        {
            if (key.StartsWith("someValuestoReturn"))
            {
                string value = ConfigurationManager.AppSettings[key].Split(',');
                values.Add(value);
            }

        }

string[] myValuesfromWebConfig = values.ToArray();

And that's it, you get all of your values stored in a array called myValuesfromWebConfig

And if you want something else than a string, just change your list/array type from string to int for example..

As you can see I included

string value = ConfigurationManager.AppSettings[key].Split(',');

HERE MORE ABOUT Split method

because your values are comma separated, and I guess you would like to add them to a array/list separately.. :)

Thanks

EDIT:

Because of your error that you wrote in comment, we can skip adding it to an a array, simply delete that line, you will have your values stored in list values anyway, so at the end it migth look like this:

List<string> values = new List<string>();

foreach (string key in ConfigurationManager.AppSettings)
{
     if (key.StartsWith("someValuestoReturn"))
     {
                    string value = ConfigurationManager.AppSettings[key].Split(',');
                    values.Add(value);
     }

}

Now if you need to read that values or do whatever you want with them, you can loop throught them and that's it, for example:

foreach(var item in values)
{
  //Do whatever you want with your item
}

Answer 2

A string is returned not a List .

For a List use:

var _list = System.Configuration.ConfigurationManager.AppSettings["someValuestoReturn"].Split(",");

Answer 3

System.Configuration.ConfigurationManager.AppSettings["someValuestoReturn"].Split(',');

它将返回一个字符串数组