private void foo1()
{
RootObject testObject = new RootObject()
{
RootIntElement = 1,
RootStringElement = "test",
Childs = new List <ChildObject>()
};
testObject.Childs.Add(new ChildObject()
{
ChildIntElement = 11, ChildStringElement = "Child1"
});
testObject.Childs.Add(new ChildObject()
{
ChildIntElement = 12, ChildStringElement = "Child2"
});
testObject.Childs.Add(new ChildObject()
{
ChildIntElement = 13, ChildStringElement = "Child3"
});
testObject.Childs.Add(new ChildObject()
{
ChildIntElement = 14, ChildStringElement = "Child4"
});
testObject.Childs.Add(new ChildObject()
{
ChildIntElement = 15, ChildStringElement = "Child5"
});
List <ChildObject> targets = new List <ChildObject>();
targets.Add(new ChildObject()
{
ChildIntElement = 11, ChildStringElement = "TargetChild1"
});
targets.Add(new ChildObject()
{
ChildIntElement = 11, ChildStringElement = "TargetChild2"
});
targets.Add(new ChildObject()
{
ChildIntElement = 11, ChildStringElement = "TargetChild3"
});
targets.Add(new ChildObject()
{
ChildIntElement = 14, ChildStringElement = "TargetChild4"
});
targets.Add(new ChildObject()
{
ChildIntElement = 16, ChildStringElement = "TargetChild5"
});
testObject.Childs.ForEach(l =>
{
l.Childs = targets.Where(p => p.ChildIntElement.ToString() == l.ChildIntElement.ToString()).ToList();
});
var result1 = targets.Find(u => u.ChildIntElement == 10);
var result2 = targets.First(u => u.ChildIntElement == 110); //throw exception!!
var result3 = targets.FirstOrDefault(u => u.ChildIntElement == 10);
var result4 = targets.FindAll(u => u.ChildIntElement == 11);
var result5 = targets.Any(u => u.ChildIntElement == 15);
int pageindex = 10;
int pagesize = 2;
var result6 = targets.Skip((pageindex - 1) * pagesize).Take(pagesize).ToList();
var result7 = targets.Select(o => o.ChildStringElement).Distinct()
.Select((o, i) => string.Format("{0}. {1}", i + 1, o)).ToList();
ChildObject FirstOrDefaultResult = targets.FirstOrDefault(u => u.ChildIntElement == 24);
}
private void foo5()
{
List <RootObject> RootObjectList = new List <RootObject>
{
//root1: 对象完整
new RootObject()
{
RootIntElement = 1,
RootStringElement = "root1",
Childs = new List <ChildObject> {
new ChildObject()
{
ChildIntElement = 11, ChildStringElement = "Child11"
},
new ChildObject()
{
ChildIntElement = 12, ChildStringElement = "Child12"
},
new ChildObject()
{
ChildIntElement = 13, ChildStringElement = "Child13"
},
}
},
//root2: 对象完整
new RootObject()
{
RootIntElement = 2,
RootStringElement = "root2",
Childs = new List <ChildObject> {
new ChildObject()
{
ChildIntElement = 21, ChildStringElement = "Child21"
},
new ChildObject()
{
ChildIntElement = 22, ChildStringElement = "Child22"
},
new ChildObject()
{
ChildIntElement = 23, ChildStringElement = "Child23"
}
}
},
//root3: 对象内String为null
new RootObject()
{
RootIntElement = 3,
RootStringElement = null,
Childs = new List <ChildObject>()
},
//root4: 对象内ojbect为null
new RootObject()
{
RootIntElement = 4,
RootStringElement = "root4",
Childs = null
},
};
var result1 = RootObjectList.Select(l => l.RootIntElement);
var result2 = RootObjectList.Select(l => l.RootStringElement);
var result3 = RootObjectList.Where(l => l.RootIntElement == 21);
var result4 = RootObjectList.FindAll(l => l.RootIntElement == 21);
var result5 = RootObjectList.SelectMany(l => l.Childs ?? new List <ChildObject>()).ToList();
RootObject result6 = RootObjectList.First();
//RootObject result6 = RootObjectList.First(a => a.RootIntElement == 20); 查不到将报错
RootObject result7 = RootObjectList.FirstOrDefault(a => a.RootIntElement == 99);
var result8 = RootObjectList.Sum(l => l.RootIntElement);
var result9 = RootObjectList.Where(m => m.Childs != null).Sum(l => l.Childs.Sum(m => m.ChildIntElement));
var result10 = RootObjectList.OrderByDescending(o => o.RootIntElement);
result10.First().RootStringElement = "test!!!";
List <ChildObject> joinTargets = new List <ChildObject>()
{
new ChildObject()
{
ChildIntElement = 11, ChildStringElement = "TargetChild11"
},
new ChildObject()
{
ChildIntElement = 22, ChildStringElement = "TargetChild22"
},
new ChildObject()
{
ChildIntElement = 34, ChildStringElement = "TargetChild34"
},
new ChildObject()
{
ChildIntElement = 36, ChildStringElement = "TargetChild36"
}
};
RootObjectList.ForEach(l =>
{
if (l.Childs != null)
{
l.Boys = (from c in joinTargets
join u in l.Childs
on c.ChildIntElement equals u.ChildIntElement
select c).ToList();
l.Boys.ForEach(a => a.ChildStringElement = "test!!!");
}
});
}
