先添加类继承至IEqualityComparer

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public class CommonEqualityComparer<T, V> : IEqualityComparer<T>
{
private Func<T, V> keySelector;
private IEqualityComparer<V> comparer;
public CommonEqualityComparer(Func<T, V> keySelector, IEqualityComparer<V> comparer)
{
this.keySelector = keySelector;
this.comparer = comparer;
}
public CommonEqualityComparer(Func<T, V> keySelector)
: this(keySelector, EqualityComparer<V>.Default)
{ }
public bool Equals(T x, T y)
{
return comparer.Equals(keySelector(x), keySelector(y));
}
public int GetHashCode(T obj)
{
return comparer.GetHashCode(keySelector(obj));
}
}

添加扩展方法

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public static class CommonFunction
{
/// <summary>
/// 扩展Distinct方法
/// </summary>
/// <typeparam name=\"T\">源类型</typeparam>
/// <typeparam name=\"V\">委托返回类型（根据V类型，排除重复项）</typeparam>
/// <param name=\"source\">扩展源</param>
/// <param name=\"keySelector\">委托（执行操作）</param>
/// <returns></returns>
public static IEnumerable<T> Distinct<T, V>(this IEnumerable<T> source, Func<T, V> keySelector)
{
return source.Distinct(new CommonEqualityComparer<T, V>(keySelector));
}
｝

可以直接进行调用，根据Domain中的字段进行筛选

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IList<ScoredSuppliers> scoredSuppliers =
list.Where(s => s.Region == region).ToList().Distinct(c => new { ScoredSupplierId = c.ScoredSupplierId, Type = c.Type }).OrderBy(s=>s.Type).ToList()

由于匿名类型上的 Equals 和 GetHashCode 方法是根据属性的 Equals 和 GetHashcode 定义的，因此仅当同一匿名类型的两个实例的所有属性都相等时，这两个实例才相等。

ITPub博客

根据list集合中的多个属性进行筛选-扩展Distinct方法