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ObjectDataSourc用法之三(排序)

SortParameterName參數主要用於對數據源控件進尾排序

1.?????? 準備條件

參數：ObjectDataSource用法之一(SelectMethod來進行簡單的邦定)

添加一個處理對象排序的類Reverser

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;

??? }

}

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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.?????? 在業務處理類中添加如下方法

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;

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說明：當按降序排列的時候，參數order的內容為:屬性名稱+空格+DESC

?????? 當按升序排列的時候，參數order的內容為:屬性名稱

3.?????? Aspx頁面的內容為

<asp:ObjectDataSource ID="ObjectDataSource1" runat="server"

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

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

??? DataSourceID="ObjectDataSource1" 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>

說明：SortParameterName為指定SelectMethod參數指定的方法中用於排序的參數名稱

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