mcs/class/Npgsql/Npgsql/Design/NpgsqlParametersEditor.cs

   1 using System;
   2 using System.ComponentModel.Design;
   3
   4 namespace Npgsql.Design
   5 {
   6         /// <summary>
   7         /// Zusammenfassung fr NpgsqlParametersEditor.
   8         /// </summary>
   9         internal class NpgsqlParametersEditor : CollectionEditor
  10         {
  11                 NpgsqlParameterCollection parameters;
  12                 public NpgsqlParametersEditor(Type type) : base(type){
  13                         this.parameters = null;
  14                 }
  15
  16                 protected override bool CanSelectMultipleInstances() {
  17                         return false;
  18                 }
  19
  20                 protected override object CreateInstance(Type itemType) {
  21                         NpgsqlParameter param = base.CreateInstance(itemType) as NpgsqlParameter;
  22                         if (param != null){
  23                                 param.ParameterName = this.GetUniqueParameterName(this.parameters, ":Parameter", 1);
  24                         }
  25                         return param;
  26                 }
  27
  28                 public override object EditValue(System.ComponentModel.ITypeDescriptorContext context, IServiceProvider provider, object value) {
  29                         this.parameters = value as NpgsqlParameterCollection;
  30                         return base.EditValue (context, provider, value);
  31                 }
  32
  33                 protected override string HelpTopic {
  34                         get {
  35                                         return "vs.data.collectioneditor.parameter";
  36                         }
  37                 }
  38                 private string GetUniqueParameterName(NpgsqlParameterCollection parameters, string Prefix, int InitialPostfix){
  39                         int Postfix = InitialPostfix;
  40                         string ReturnValue = String.Empty;
  41                         bool IsInside = true;
  42                         while(IsInside){
  43                                 ReturnValue = String.Concat(Prefix, Postfix.ToString());
  44                                 if(parameters == null)
  45                                         break;
  46                                 IsInside = parameters.Contains(ReturnValue);
  47                                 Postfix++;
  48                         }
  49                         return ReturnValue;
  50                 }
  51         }
  52 }