mcs/class/System.Web/System.Web.UI.WebControls/QueryStringParameter.cs

   1 //
   2 // System.Web.UI.WebControls.QueryStringParameter
   3 //
   4 // Authors:
   5 //      Ben Maurer (bmaurer@users.sourceforge.net)
   6 //
   7 // (C) 2003 Ben Maurer
   8 //
   9
  10 #if NET_1_2
  11 using System.Collections;
  12 using System.Collections.Specialized;
  13 using System.Text;
  14
  15 namespace System.Web.UI.WebControls {
  16         public class QueryStringParameter : Parameter {
  17                 protected QueryStringParameter (QueryStringParameter original) : base (original)
  18                 {
  19                         this.QueryStringField = original.QueryStringField;
  20
  21                 }
  22
  23                 public QueryStringParameter (string name, string queryStringField) : base (name)
  24                 {
  25                         QueryStringField = queryStringField;
  26                 }
  27
  28                 public QueryStringParameter (string name, TypeCode type, string queryStringField) : base (name, type)
  29                 {
  30                         QueryStringField = queryStringField;
  31                 }
  32
  33                 protected override Parameter Clone ()
  34                 {
  35                         return new QueryStringParameter (this);
  36                 }
  37
  38                 protected override object Evaluate (Control control)
  39                 {
  40                         if (control == null || control.Page == null || control.Page.Request == null)
  41                                 return null;
  42
  43                         return control.Page.Request.QueryString [QueryStringField];
  44                 }
  45
  46                 public string QueryStringField {
  47                         get {
  48                                 string s = ViewState ["QueryStringField"] as string;
  49                                 if (s != null)
  50                                         return s;
  51
  52                                 return "";
  53                         }
  54                         set {
  55                                 if (QueryStringField != value) {
  56                                         ViewState ["QueryStringField"] = value;
  57                                         OnParameterChanged ();
  58                                 }
  59                         }
  60                 }
  61         }
  62 }
  63 #endif
  64