Berikut adalah contoh sederhana yang menunjukkan bagaimana delegasi yang berguna dapat membuat kode sederhana yang mengikuti prinsip KERING. Ini juga memungkinkan Anda untuk menjaga kode sangat dekat dengan tempat yang dibutuhkan.
Action<Button, Action<Button>> prepareButton =
(btn, nxt) => {
btn.Height = 32;
btn.Width= 64;
nxt(btn);
};
prepareButton(myBtn1, btn => btn.Text = "A");
prepareButton(myBtn2, btn => btn.Text = "B");
prepareButton(myBtn3, btn => btn.Text = "C");
Ini adalah contoh nyata dari keuntungan yang diberikan oleh delegasi.
protected override void PageInitialize()
{
const string selectCodeFormat = "javascript:selectCode('{0}', '{1}');";
const string onClick = "return toggleElement(this);";
Func<HtmlGenericControl> getElement = null;
Action<HtmlGenericControl> setElement = null, addChild = null;
HtmlGenericControl level1Element = null, level2Element = null, level3Element = null, level4Element = null;
string className = null, code = null, description = null;
using (var records = Core.Database.ExecuteRecords("code.SocCodeTree"))
{
while (records.Read())
{
code = records.GetString("Code");
description = records.GetString("Description");
if (records.GetString("Level4") != "")
{
className = "Level4";
setElement = e => level4Element = e;
getElement = () => level4Element;
addChild = e => level3Element.Controls.Add(e);
}
else if (records.GetString("Level3") != "")
{
className = "Level3";
setElement = e => level3Element = e;
getElement = () => level3Element;
addChild = e => level2Element.Controls.Add(e);
}
else if (records.GetString("Level2") != "")
{
className = "Level2";
setElement = e => level2Element = e;
getElement = () => level2Element;
addChild = e => level1Element.Controls.Add(e);
}
else
{
className = "Level1";
setElement = e => level1Element = e;
getElement = () => level1Element;
addChild = e => Root.Controls.Add(e);
}
var child = new HtmlGenericControl("li");
child.Attributes["class"] = className;
var span = new HtmlGenericControl("span") {
InnerText = code + " - " + description + " - "
};
span.Attributes["onclick"] = onClick;
child.Controls.Add(span);
var a = new HtmlAnchor() {
InnerText = "Select",
HRef = string.Format(selectCodeFormat, code, description)
};
child.Controls.Add(a);
setElement(new HtmlGenericControl("ul"));
child.Controls.Add(getElement());
addChild(child);
}
}
}