public static void AssertGenericArgumentNotNull <T>(T arg, string argName)
{
Type type = typeof(T);
if (type.IsValueType && (!type.IsGenericType || type.GetGenericTypeDefinition() != typeof(Nullable <>)))
{
return;
}
ArgumentHelper.AssertNotNull <object>((object)arg, argName);
}
/// <summary>
/// Attempts to convert the specified value back.
/// </summary>
/// <param name="value">
/// The value to convert.
/// </param>
/// <param name="targetType">
/// The type of the binding target property.
/// </param>
/// <param name="parameter">
/// The converter parameter to use.
/// </param>
/// <param name="culture">
/// The culture to use in the converter.
/// </param>
/// <returns>
/// A converted value.
/// </returns>
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
ArgumentHelper.AssertNotNull(targetType, "targetType");
try
{
return(System.Convert.ChangeType(value, targetType, culture));
}
catch (Exception)
{
return(DependencyProperty.UnsetValue);
}
}
public static void AssertNotNull <T>(IEnumerable <T> arg, string argName, bool assertContentsNotNull)
{
ArgumentHelper.AssertNotNull <IEnumerable <T> >(arg, argName);
if (!assertContentsNotNull || !typeof(T).IsClass)
{
return;
}
foreach (T obj in arg)
{
if ((object)obj == null)
{
throw new ArgumentException("An item inside the enumeration was null.", argName);
}
}
}
public static void AssertNotNull <T>(this IEnumerable <T> arg, string argName, bool assertContentsNotNull)
{
ArgumentHelper.AssertNotNull <T>(arg, argName, assertContentsNotNull);
}
public static void AssertNotNull <T>(this T?arg, string argName) where T : struct
{
ArgumentHelper.AssertNotNull <T>(arg, argName);
}
public static void AssertEnumMember <TEnum>(TEnum enumValue, string argName, params TEnum[] validValues) where TEnum : struct, IConvertible
{
ArgumentHelper.AssertNotNull <TEnum[]>(validValues, "validValues");
if (Attribute.IsDefined((MemberInfo)typeof(TEnum), typeof(FlagsAttribute), false))
{
long num = enumValue.ToInt64((IFormatProvider)CultureInfo.InvariantCulture);
bool flag;
if (num == 0L)
{
flag = true;
foreach (TEnum @enum in validValues)
{
if (@enum.ToInt64((IFormatProvider)CultureInfo.InvariantCulture) == 0L)
{
flag = false;
break;
}
}
}
else
{
foreach (TEnum @enum in validValues)
{
num &= [email protected]((IFormatProvider)CultureInfo.InvariantCulture);
}
flag = num != 0L;
}
if (!flag)
{
return;
}
throw new ArgumentException(string.Format((IFormatProvider)CultureInfo.InvariantCulture, "Enum value '{0}' is not allowed for flags enumeration '{1}'.", new object[2]
{
(object)enumValue,
(object)typeof(TEnum).FullName
}), argName);
}
else
{
foreach (TEnum @enum in validValues)
{
if (enumValue.Equals((object)@enum))
{
return;
}
}
if (!Enum.IsDefined(typeof(TEnum), (object)enumValue))
{
throw new ArgumentException(string.Format((IFormatProvider)CultureInfo.InvariantCulture, "Enum value '{0}' is not defined for enumeration '{1}'.", new object[2]
{
(object)enumValue,
(object)typeof(TEnum).FullName
}), argName);
}
else
{
throw new ArgumentException(string.Format((IFormatProvider)CultureInfo.InvariantCulture, "Enum value '{0}' is defined for enumeration '{1}' but it is not permitted in this context.", new object[2]
{
(object)enumValue,
(object)typeof(TEnum).FullName
}), argName);
}
}
}