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ASP.NET - O objeto do Hashtable

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O objeto do Hashtable contem artigos no formulário de pares da chave/valor.



O objeto de SortedList

O objeto do Hashtable contem artigos no formulário de pares da chave/valor e as chaves são usadas como índices, e as buscas muito rápidas podem ser feitas para valores procurarando com suas chaves.

Com o método da adição (), os artigos são adicionados ao Hashtable.

O código abaixo cría um Hashtable nomeado mycountries e quatro elementos são adicionados:

<script runat="server">
Sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New Hashtable
mycountries.Add("N","Norway")
mycountries.Add("S","Sweden")
mycountries.Add("F","France")
mycountries.Add("I","Italy")
end if
end sub
</script>


Emperramento dos dados

Um objeto do Hashtable pode automaticamente gerar os valores e o texto aos seguintes controles:

  • asp: RadioButtonList
  • asp: CheckBoxList
  • asp: DropDownList
  • asp: Listbox

Criar primeiramente um controle de RadioButtonList (sem algum asp: Elementos de ListItem) em uma página de .aspx para ligar dados a um controle de RadioButtonList:

<html>
<body>
<form runat="server">
<asp:RadioButtonList id="rb" runat="server"
AutoPostBack="True" />
</form>
</body>
</html>

Adicionar então o seguinte certificado que constrói a lista:

<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New Hashtable
mycountries.Add("N","Norway")
mycountries.Add("S","Sweden")
mycountries.Add("F","France")
mycountries.Add("I","Italy")
rb.DataSource=mycountries
rb.DataValueField="Key"
rb.DataTextField="Value"
rb.DataBind()
end if
end sub
</script>
<html>
<body>
<form runat="server">
<asp:RadioButtonList id="rb" runat="server"
AutoPostBack="True" />
</form>
</body>
</html>

Então no controle de RadioButtonList, nós adicionamos uma rotina secundária a ser executada quando o usuário estala sobre um artigo. Um texto publicar-se-á em uma etiqueta, quando uma tecla de rádio é estalada:

<script runat="server">
sub Page_Load
if Not Page.IsPostBack then
dim mycountries=New Hashtable
mycountries.Add("N","Norway")
mycountries.Add("S","Sweden")
mycountries.Add("F","France")
mycountries.Add("I","Italy")
rb.DataSource=mycountries
rb.DataValueField="Key"
rb.DataTextField="Value"
rb.DataBind()
end if
end sub
sub displayMessage(s as Object,e As EventArgs)
lbl1.text="Your favorite country is: " & rb.SelectedItem.Text
end sub
</script>
<html>
<body>
<form runat="server">
<asp:RadioButtonList id="rb" runat="server"
AutoPostBack="True" onSelectedIndexChanged="displayMessage" />
<p><asp:label id="lbl1" runat="server" /></p>
</form>
</body>
</html>

Nota: Você não pode escolher a ordem da sorte dos artigos adicionados ao Hashtable. Usar o objeto de SortedList, classificar alfabeticamente ou numericamente artigos.





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Keywords: ASP.NET using The Hashtable Object, vb net hashtable, asp net hashtable, vb net using, asp net object, vb net object, visual basic object, visual basic using, asp net using, c# hashtable, java hashtable, jsp hashtable, c# using, hashmap hashtable, hashtable api, hashtable array, sort hashtable, hashtable collection, vb hashtable, java object, hashtable serializable, arraylist object, hashtable example, c# object, arraylist hashtable, hashtable string, hashtable enumeration, hashtable iterator, value object, static hashtable, hashtable value, object string, hashtable xml, using msdn


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