public static T GetArgument <T>(IEnumerable <string> arguments, string name, T defaultValue)
{
if (arguments == null)
{
return(defaultValue);
}
foreach (string arg in arguments)
{
if (arg.StartsWith("-") || arg.StartsWith("/"))
{
int pos = arg.IndexOfAny(new[] { '=', ':' }, 1);
string argName = pos < 0 ? arg.Substring(1) : arg.Substring(1, pos - 1);
if (string.Compare(name, argName, StringComparison.OrdinalIgnoreCase) == 0)
{
string value = pos < 0 ? string.Empty : arg.Substring(pos + 1).Trim();
if (value.Length == 0)
{
if (typeof(T) == typeof(bool)) // special case for bool args: if it's there, return true
{
return((T)(object)true);
}
return(defaultValue);
}
return(Extensions.ChangeType(value, defaultValue));
}
}
}
return(defaultValue);
}
public static object GetArgument(string name, object defaultValue, Type conversionType, IFormatProvider provider)
{
if (name == null)
{
throw new ArgumentNullException("name");
}
if (conversionType == null)
{
throw new ArgumentNullException("conversionType");
}
string s;
if (!_namedArguments.TryGetValue(name, out s))
{
return(defaultValue);
}
if (conversionType == typeof(bool) && string.IsNullOrEmpty(s))
{
return(true);
}
return(Extensions.ChangeType(s, conversionType, defaultValue, provider));
}
public static object GetArgument(int index, object defaultValue, Type conversionType, IFormatProvider provider)
{
if (!_positionArguments.TryGetValue(index, out string s))
{
return(defaultValue);
}
return(Extensions.ChangeType(s, conversionType, defaultValue, provider));
}
public static T GetArgument <T>(int index, T defaultValue, IFormatProvider provider)
{
if (!_positionArguments.TryGetValue(index, out string s))
{
return(defaultValue);
}
return(Extensions.ChangeType(s, defaultValue, provider));
}
public static T GetArgument <T>(string name, T defaultValue, IFormatProvider provider)
{
if (name == null)
{
throw new ArgumentNullException(nameof(name));
}
if (!_namedArguments.TryGetValue(name, out string s))
{
return(defaultValue);
}
if (typeof(T) == typeof(bool) && string.IsNullOrEmpty(s))
{
return((T)(object)true);
}
return(Extensions.ChangeType(s, defaultValue, provider));
}
