Linq does not name the Equals method

Question

I have the following class

public class ModInfo : IEquatable<ModInfo>
{
    public int ID { get; set; }
    public string MD5 { get; set; }

    public bool Equals(ModInfo other)
    {
        return other.MD5.Equals(MD5);
    }

    public override int GetHashCode()
    {
        return MD5.GetHashCode();
    }
}

I load some data into the list of this class using the following method:

public void ReloadEverything() {
    var beforeSort = new List<ModInfo>();
    // Bunch of loading from local sqlite database. 
    // not included since it reload boring to look at
    var modinfo = beforeSort.OrderBy(m => m.ID).AsEnumerable().Distinct().ToList();
}

The problem is that the call Distinct()does not do this work. There are still objects that are equal to each other.

According to this article: https://msdn.microsoft.com/en-us/library/vstudio/bb348436%28v=vs.100%29.aspx this is how you should do an excellent job, however it looks like it does not call the Equals method of the ModInfo object. What could be the reason for this?

Example values:

modinfo[0]: id=2069, MD5 =0AAEBF5D2937BDF78CB65807C0DC047C
modinfo[1]: id=2208, MD5 = 0AAEBF5D2937BDF78CB65807C0DC047C

I don’t care what value is chosen, they are likely to be the same, since the md5 value will be the same.

Answer 1

Object.Equals, IEquatable.

:

public override bool Equals(object other)
{
    ModInfo mod = other as ModInfo;
    if (mod != null)
        return Equals(mod);
    return false;
}

.

. : IEquatable

EDIT: , , GetHashCode.

public class ModInfo : IEquatable<ModInfo>
{
    public int ID { get; set; }
    public string MD5 { get; set; }

    public bool Equals(ModInfo other)
    {
        if (other == null) return false;
        return (this.MD5.Equals(other.MD5));
    }

    public override int GetHashCode()
    {
        unchecked
        {
            int hash = 13;
            hash = (hash * 7) + MD5.GetHashCode();
            return hash;
        }
    }

    public override bool Equals(object obj)
    {
        ModInfo other = obj as ModInfo;
        if (other != null)
        {
            return Equals(other);
        }
        else
        {
            return false;
        }
    }
}

:

ModInfo mod1 = new ModInfo {ID = 1, MD5 = "0AAEBF5D2937BDF78CB65807C0DC047C"};
ModInfo mod2 = new ModInfo {ID = 2, MD5 = "0AAEBF5D2937BDF78CB65807C0DC047C"};

// You should get true here
bool areEqual = mod1.Equals(mod2);

List<ModInfo> mods = new List<ModInfo> {mod1, mod2};

// You should get 1 result here
mods = mods.Distinct().ToList();

GetHashCode?

Answer 2

public bool Equals(object other)
    {
        return this.Equals(other as ModInfo)
    }

. : https://msdn.microsoft.com/en-us/library/ms173147(v=vs.80).aspx