FromAppSettings
Get a value from AppSettings section of Web.Config and change its type to the correct one or return a default value in case the key doesn't exists.
Source
public static T FromAppSettings<T>(this string key, T defaultValue = default(T)) where T : IConvertible
{
if (string.IsNullOrWhiteSpace(key))
return defaultValue;
var value = ConfigurationManager.AppSettings[key];
if (string.IsNullOrWhiteSpace(value))
return defaultValue;
var tc = Type.GetTypeCode(typeof(T));
switch (tc)
{
case TypeCode.Boolean:
case TypeCode.Byte:
case TypeCode.DateTime:
case TypeCode.Decimal:
case TypeCode.Double:
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
case TypeCode.String:
T output;
try
{
output = (T)Convert.ChangeType(value, tc);
}
catch
{
output = defaultValue;
}
return output;
default:
throw new NotSupportedException();
}
}Example
//Example 1
var email = "EMail".FromAppSettings(string.Empty);
//Example 2
var email = "EMail".FromAppSettings("noreply@extensionmethod.net");
//Example 3
var id = "AppID".FromAppSettings(int.MinValue);