How to get information from an App.config

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How to get information from an App.config

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#1 by (1 votes)

1

I'm doing a program where I wanted the user to put in the variable the number they need because it will vary from computer to computer, which will be the number that needs it. I'm using the App.config for this but it's sending me to the blank result the code that I'm using in App.Config is this

<startup>
  <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<appSettings>
    <add key ="teste" value="1234"/>
</appSettings>

The code I am using to receive this value is this

string campoExtra = ConfigurationManager.AppSettings["teste"];
MessageBox.Show(campoExtra);

And the MessageBox comes in white I can not find the error.

c# app.config

asked by anonymous 21.08.2017 / 17:57

1 answer

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score 1 · Accepted Answer

You need to open the configuration file before

ConfigurationManager.OpenExeConfiguration (AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);

Assigns the reading to a variable and reads from it

Configuration config= ConfigurationManager.OpenExeConfiguration(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);


string campoExtra =  config.AppSettings.Settings[key].Value;
MessageBox.Show(campoExtra);

I have a class that assists me in this, if it is of your interest follows below:

public static class AppConfig
{
    private static Configuration config= ConfigurationManager.OpenExeConfiguration(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);



    public static bool HasKey(string key)
    {
        return config.AppSettings.Settings.AllKeys.Contains(key);
    }
    public static string Get(string key)
    {
        return config.AppSettings.Settings[key].Value;
    }
    public static bool GetBolean(string key)
    {
        var value = config.AppSettings.Settings[key].Value;
        if (string.IsNullOrEmpty(value))
            return default(bool);
        return bool.Parse(value);
    }
    public static object GetObject(string key, Type type)
    {
        var method = type.GetMethod("Parse");
        if (method != null)
        {
            var v = method.Invoke(type, new[] { AppConfig.Get(key) });
            return v;
        }
        else
        {
            return AppConfig.Get(key);
        }

    }
    public static T Get<T>(string key)
    {
        var method = typeof(T).GetMethod("Parse", new[] { typeof(string) });
        if (method != null)
        {
            var v = method.Invoke(typeof(T), new[] { AppConfig.Get(key) });
            return (T)v;
        }
        throw new Exception("O tipo não é convertivel");

    }

    public static void SetValue(string key, object value)
    {


        if (value == null)
        {
            if (!HasKey(key))
                config.AppSettings.Settings.Add(key, "");
            else
                config.AppSettings.Settings[key].Value = "";

        }
        else
        {
            if (!HasKey(key))
                config.AppSettings.Settings.Add(key, value.ToString());
            else                   
                config.AppSettings.Settings[key].Value = value.ToString();
        }

        config.Save(ConfigurationSaveMode.Minimal);
    }
}