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distinct a list of class objects by one attribute

By C0OK1EC0OK1E on Nov 05, 2020
        class ItemEqualityComparer : IEqualityComparer<Class>
        {
            public bool Equals(Class x, Class y)
            {
                // Two items are equal if their keys are equal.
                return x.Attribute == y.Attribute;
            }

            public int GetHashCode(Class obj)
            {
                return obj.Attribute.GetHashCode();
            }
        }
        
        // then select distinct in method
        List<Class> returnList = new List<Class>();
        returnList = sourceList.Distinct(new ItemEqualityComparer()).ToList();

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