/// <summary>
/// Removes default values from a list
/// </summary>
/// <typeparam name="T">Value type</typeparam>
/// <param name="Value">List to cull items from</param>
/// <param name="EqualityComparer">Equality comparer used (defaults to GenericEqualityComparer)</param>
/// <returns>An IEnumerable with the default values removed</returns>
public static IEnumerable <T> RemoveDefaults <T>(this IEnumerable <T> Value, IEqualityComparer <T> EqualityComparer = null)
{
if (Value.IsNull())
{
return(Value);
}
EqualityComparer = EqualityComparer.NullCheck(new GenericEqualityComparer <T>());
return(Value.Where(x => !x.IsDefault(EqualityComparer)));
}
/// <summary>
/// Removes default values from a list
/// </summary>
/// <typeparam name="T">Value type</typeparam>
/// <param name="value">List to cull items from</param>
/// <param name="equalityComparer">Equality comparer used (defaults to GenericEqualityComparer)</param>
/// <returns>An IEnumerable with the default values removed</returns>
public static IEnumerable <T> RemoveDefaults <T>(this IEnumerable <T> value,
IEqualityComparer <T> equalityComparer = null)
{
if (value.IsNull())
{
return(value);
}
equalityComparer = equalityComparer.NullCheck(() => new GenericEqualityComparer <T>());
return(value.Where(x => !x.IsDefault(equalityComparer)));
}
/// <summary>
/// Removes default values from a list
/// </summary>
/// <typeparam name="T">Value type</typeparam>
/// <param name="Value">List to cull items from</param>
/// <param name="EqualityComparer">Equality comparer used (defaults to GenericEqualityComparer)</param>
/// <returns>An IEnumerable with the default values removed</returns>
public static IEnumerable <T> RemoveDefaults <T>(this IEnumerable <T> Value, IEqualityComparer <T> EqualityComparer = null)
{
if (Value.IsNull())
{
yield break;
}
EqualityComparer = EqualityComparer.NullCheck(new GenericEqualityComparer <T>());
foreach (T Item in Value.Where(x => !EqualityComparer.Equals(x, default(T))))
{
yield return(Item);
}
}
/// <summary>
/// 从列表中移除默认值
/// </summary>
public static IEnumerable <T> RemoveDefaults <T>(this IEnumerable <T> value, IEqualityComparer <T> equalityComparer = null)
{
if (value == null)
{
yield break;
}
equalityComparer = equalityComparer.NullCheck(new GenericEqualityComparer <T>());
foreach (T item in value.Where(x => !equalityComparer.Equals(x, default(T))))
{
yield return(item);
}
}
/// <summary>
/// Determines the position of an object if it is present, otherwise it returns -1
/// </summary>
/// <typeparam name="T">Object type</typeparam>
/// <param name="list">List of objects to search</param>
/// <param name="Object">Object to find the position of</param>
/// <param name="equalityComparer">Equality comparer used to determine if the object is present</param>
/// <returns>The position of the object if it is present, otherwise -1</returns>
public static int PositionOf <T>(this IEnumerable <T> list, T Object, IEqualityComparer <T> equalityComparer = null)
{
Guard.NotNull(list, "list");
equalityComparer = equalityComparer.NullCheck(() => new GenericEqualityComparer <T>());
int count = 0;
foreach (var item in list)
{
if (equalityComparer.Equals(Object, item))
{
return(count);
}
++count;
}
return(-1);
}
/// <summary>
/// Determines if the object is null
/// </summary>
/// <typeparam name="T">Object type</typeparam>
/// <param name="Object">The object to check</param>
/// <param name="equalityComparer">Equality comparer used to determine if the object is equal to default</param>
/// <returns>True if it is null, false otherwise</returns>
public static bool IsDefault <T>(this T Object, IEqualityComparer <T> equalityComparer = null)
{
return(equalityComparer.NullCheck(() => new GenericEqualityComparer <T>()).Equals(Object, default(T)));
}
/// <summary>
/// Determines if the object is null
/// </summary>
public static bool IsDefault <T>(this T obj, IEqualityComparer <T> equalityComparer = null)
{
return(equalityComparer.NullCheck(new GenericEqualityComparer <T>()).Equals(obj, default(T)));
}
