using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Transactions;namespace Activity
{public class ActivitySceneService{public List<DrawPlay> GetDraw(int activitySceneID){using (var dbContext = new DbContext()){var merchant = dbContext.Find<Merchant>(1);var playList = new List<DrawPlay>();playList = dbContext.Draw001Plays.Where(u => u.ActivitySceneID == activitySceneID).Distinct(new Compare<DrawPlay>((x, y) => (x != null && y != null && x.UserID == y.UserID))).ToList();//放置比较器return playlist;}}}public delegate bool CompareDelegate<T>(T x, T y);public class Compare<T> : IEqualityComparer<T>{private CompareDelegate<T> _compare;public Compare(CompareDelegate<T> d){this._compare = d;}public bool Equals(T x, T y){if (_compare != null){return this._compare(x, y);}else{return false;}}public int GetHashCode(T obj){return obj.ToString().GetHashCode();}}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;namespace NAMESPACE
{public class CLASSNAME{public void Test(){using (var dbContext = new DbContext()){dbContext.DATABASE.Distinct(new Compare<MODELTYPE>((x, y) => (x != null && y != null && x.FIELD> VALUE && y.FIELD> VALUE))).ToList();}}}//使用委托public delegate bool CompareDelegate<T>(T x, T y);public class Compare<T> : IEqualityComparer<T>{private CompareDelegate<T> _compare;public Compare(CompareDelegate<T> d){this._compare = d;}public bool Equals(T x, T y){if (_compare != null){return this._compare(x, y);}else{return false;}}public int GetHashCode(T obj){return obj.ToString().GetHashCode();}}
}

Distinct项目内使用using Qxun.Framework.Utilityvar onlineRecords = dbContext.OnLineRecords.ToList().Distinct(new CompareExtend<OnLineRecord>((x, y) => x != null && y != null && x.MerchantID == y.MerchantID && x.ActivitySceneID == y.ActivitySceneID));****************************************CompareExtend类********************************************************using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace Qxun.Framework.Utility
{public delegate bool CompareDelegate<T>(T x, T y);public class CompareExtend<T> : IEqualityComparer<T>{private CompareDelegate<T> _compare;public CompareExtend(CompareDelegate<T> d){this._compare = d;}public bool Equals(T x, T y){if (_compare != null){return this._compare(x, y);}else{return false;}}public int GetHashCode(T obj){return obj.ToString().GetHashCode();}}
}