List (t) Implementation object operations, find findall contains foreach sort

Object class:

News publication entity
[Mapto ( " Us_news " )]
Public   Abstract   Class Newsbll
{
[Mapto ( " FID " )]
Public   Abstract   String Id { Get ;}
///   <Summary>
/// Title
///   </Summary>
[Mapto ( " Fcaption " )]
Public   Abstract   String Caption { Get ; Set ;}
///   <Summary>
/// News category PK-ss_Item.ID
///   </Summary>
[Mapto ( " FTYPE " )]
[Manytoone (localkey =   " FTYPE " , Foreignkey =   " FID " )]
Public   Abstract Dictitembll type { Get ; Set ;}
///   <Summary>
/// News content
///   </Summary>
[Mapto ( " Fcontent " )]
Public   Abstract   String Content { Get ; Set ;}
///   <Summary>
/// Publisher
///   </Summary>
[Mapto ( " Fuserid " )]
Public   Abstract   String Userid { Get ; Set ;}
}
News category
[Mapto ( " Ss_item " )]
Public   Abstract   Class Dictitembll
{

[Mapto ("FID")]
Public Abstract IntId {Get;}

///   <Summary>
/// Group ID
///   </Summary>
[Mapto ( " Fclassid " )]
Public   Abstract   Int Classid { Get ; Set ;}
///   <Summary>
/// Parent node ID
///   </Summary>
[Mapto ( " Fparentid " )]
Public   Abstract   Int Parentid { Get ; Set ;}
///   <Summary>
/// Dictionary name
///   </Summary>
[Mapto ( " Fname " )]
Public   Abstract   String Name { Get ; Set ;}

# Endregion

}

1. Use Find to search for a single matching Value

 

Newsbll news = List. Find ( Delegate (Newsbll X)
{
Return X. type. ID =   10001 ; // Search for a single object with ID = 10001 in the category (type) Sub-object in the News list
});

2. Use findall to search for Multiple matching values.

List < Newsbll > Newslist = List. Find ( Delegate (Newsbll X)
{
Return X. type. ID =   10001 ; // Search for multiple objects with ID = 10001 in the category (type) Sub-object in the News list
});

3. Check whether the value meeting the condition exists using contains

 

Bool Iscontains = List. Find ( Delegate (Newsbll X)
{
Return X. type. ID =   10001   && X. userid = " Ejiyuan " ; // Search for the id = 10001 in the subobject of category (type) in the News list, and whether the publisher is ejiyuan.
});

4. Use foreach to operate on each list object

 

List. Find ( Delegate (Newsbll X)
{
X. Caption =   " 10001 " ; // Change all titles in the list to 10001

});

5. sort by sort and by category ID

List. Sort ( Delegate (Newsbll X, documentbll y)
{
If (X. type. ID < Y. type. ID)
{
Return   - 1 ;
}
Else   If (X. type. ID = Y. type. ID)
{
Return   0 ;
}
Else   Return   1 ;
});