Object‑c usage 3 (sorting)

 

Object‑c usage 3 (sorting)

SortParameterName records are used to sort data sources at the end.

1. Quasi-renewal

Metric data: One of the ObjectDataSource usage (SelectMethod is used to sort the parameter values)

Add a class Reverser for processing object sorting

Public class Reverser <T>: IComparer <T>

{

Private Type type = null;

Private ReverserInfo info;

Public Reverser (string className, string name, ReverserInfo. Direction direction)

{

Try

{

This. type = Type. GetType (className, true );

This.info. name = name;

This.info. direction = direction;

}

Catch (Exception e)

{

Throw new Exception (e. Message );

}

}

Int IComparer <T>. Compare (T t1, T t2)

{

Object x = this. type. InvokeMember (this.info. name, BindingFlags. Public | BindingFlags. Instance | BindingFlags. GetProperty, null, t1, null );

Object y = this. type. InvokeMember (this.info. name, BindingFlags. Public | BindingFlags. Instance | BindingFlags. GetProperty, null, t2, null );

If (this.info. direction! = ReverserInfo. Direction. ASC)

Swap (ref x, ref y );

Return (new CaseInsensitiveComparer (). Compare (x, y );

}

Private void Swap (ref object x, ref object y)

{

Object temp = null;

Temp = x;

X = y;

Y = temp;

}

}

 

Public struct ReverserInfo

{

Public enum Direction

{

ASC = 0,

DESC,

};

Public enum Target

{

CUSTOMER = 0,

FORM,

FIELD,

SERVER,

};

Public string name;

Public Direction direction;

Public Target target;

}

2. Add the following methods to the business processing class:

Public List <EntityMember> OrderItems (string order)

{

String orderName = order. Split ('') [0];

ReverserInfo. Direction dir = ReverserInfo. Direction. ASC;

If (order. Split (''). Length> 1 & order. Split ('') [1] = "DESC") dir = ReverserInfo. Direction. DESC;

List <EntityMember> result = new List <EntityMember> ();

XmlDocument doc = new XmlDocument ();

Doc. Load (_ path );

XmlNodeList nodes = doc. SelectNodes ("/Members/Member ");

Foreach (XmlNode node in nodes)

{

Result. add (new EntityMember (node. selectSingleNode (". /UID "). innerText, node. selectSingleNode (". /PWD "). innerText, node. selectSingleNode (". /Email "). innerText ));

}

Reverser <EntityMember> reverser = new Reverser <EntityMember> ("EntityMember", orderName, dir );

Result. Sort (reverser );

Return result;

 

Description: when the order is in descending order, the content of the order is: Natural name + space + DESC

When the order is in ascending order, the order content is as follows: Dynamic

3. The content of Aspx indexes is

<Asp: ObjectDataSource ID = "objectperformance1" runat = "server"

SelectMethod = "OrderItems" SortParameterName = "order" TypeName = "Member"> </asp: ObjectDataSource>

<Asp: GridView ID = "GridView1" runat = "server" AutoGenerateColumns = "False"

Performanceid = "objectperformance1" AllowSorting = "true">

<Columns>

<Asp: BoundField DataField = "UID" HeaderText = "UID" SortExprEssion = "UID"/>

<Asp: BoundField DataField = "PWD" HeaderText = "PWD" SortExprEssion = "PWD"/>

<Asp: BoundField DataField = "Email" HeaderText = "Email" SortExprEssion = "Email"/>

</Columns>

</Asp: GridView>

Description: SortParameterName indicates the sequence number used in the method specified by the SelectMethod parameter.