asp.NetGridViewソートの簡単な実装

 
  
using System; 
  
using System.Data; 
  
using System.Configuration; 
  
using System.Collections; 
  
using System.Web; 
  
using System.Web.Security; 
  
using System.Web.UI; 
  
using System.Web.UI.WebControls; 
  
using System.Web.UI.WebControls.WebParts; 
  
using System.Web.UI.HtmlControls; 
  
 
  
public partial class GridViewSort : System.Web.UI.Page 
  
{ 
  
protected void Page_Load(object sender, EventArgs e) 
  
{ 
  
if (!IsPostBack) 
  
{ 
  
ViewState["SortOrder"] = "PID"; 
  
ViewState["OrderDire"] = "Desc"; 
  
Bind(); 
  
} 
  
} 
  
private void Bind() 
  
{ 
  
gdvSort.AllowSorting = true; 
  
DataView dv = getDt().DefaultView; 
  
dv.Sort = (string)ViewState["SortOrder"] + " " + (string)ViewState["OrderDire"]; 
  
gdvSort.DataSource = dv; 
  
gdvSort.DataBind(); 
  
} 
  
/// 
 
  
///       ，      DataTable 
  
/// 
 
  
///  
  
private DataTable getDt() 
  
{ 
  
DataTable dt = new DataTable(); 
  
dt.Columns.Add("PID", typeof(System.Int32)); 
  
dt.Columns.Add("UserName", typeof(System.String)); 
  
for (int i = 0; i < 10; i++) 
  
{ 
  
DataRow dr = dt.NewRow(); 
  
dr["PID"] = i; 
  
dr["UserName"] = "  " + i; 
  
dt.Rows.Add(dr); 
  
} 
  
return dt; 
  
} 
  
protected void gdvSort_Sorting(object sender, GridViewSortEventArgs e) 
  
{ 
  
string sPage = e.SortExpression; 
  
if (ViewState["SortOrder"].ToString() == sPage) 
  
{ 
  
if (ViewState["OrderDire"].ToString() == "Desc") 
  
{ 
  
ViewState["OrderDire"] = "Asc"; 
  
} 
  
else 
  
{ 
  
ViewState["OrderDire"] = "Desc"; 
  
} 
  
} 
  
else 
  
ViewState["SortOrder"] = e.SortExpression; 
  
Bind(); 
  
} 
  
}