Data:
The name of the class
Zhang SAN 1
Zhang SAN 1
Li si 2
Zhang SAN 2
Zhang SAN 2

Expected results:
The name of the class
Zhang SAN 1
Zhang SAN 1
Li si 2
Zhang SAN 2

Class 1 case XiaBuQu weighs only to class for 2 to heavy, for such a linq statement

CodePudding user response:

The union,

CodePudding user response:

 public static void Main (string [] args) 
{
Var list=new List () {
New User () {Name="* *", the Age=1}, 
New User () {Name="* *", the Age=1}, 
New User () {Name="bill", the Age=2}, 
New User () {Name="* *", the Age=2}, 
New User () {Name="* *", the Age=2}, 
}; 

Var q=list. The Where (x=& gt; X.A ge==1). The Union (the list. The Where (x=& gt; X.A ge==2). The Distinct (new userCompare ())). ToList (); 
Q.F orEach (x=& gt; Console. WriteLine (x.N ame + ":" + x.A ge)); 
Console.ReadLine(); 
} 

The class userCompare: IEqualityComparer 
{
Public Boolean Equals (User x, the User y) 
{
Return x.N ame. Equals (y.N ame) & amp; & X.A ge. Equals (y.A ge); 
} 

Public int GetHashCode (User obj) 
{
Return (obj. Name + obj. Age). GetHashCode (); 
} 
} 

Public class User 
{
Public int ID {get; set; } 
Public string Name {get; set; } 
Public int the Age {get; set; } 
Public bool? IsChild {get; set; } 

Public User Clone () 
{
Return (User) enclosing MemberwiseClone (); 
} 
} 

CodePudding user response:

A whopping linq zones,

CodePudding user response:

With a distinct

CodePudding user response:

Lambda condition 1 union 2 to heavy, no trouble, thinking is such a train of thought, how to write about the same

 var q=(
The from c in the list 
Where Arthur c. lass==1 
Select new {c.N ame, Arthur c. lass} 
). The Concat (
(from c in the list 
Where Arthur c. lass==2 
Select new {c.N ame, Arthur c. lass}) Distinct ());