How to convert Dictionary Keys into array
.Net framework Dictionary<TKey, TValue> class represents a
collection of keys and values. the Dictionary<TKey, TValue>.Keysproperty
allow us to get a collection containing the keys in the Dictionary<TKey,
TValue>. this Keys property value type isSystem.Collections.Generic.Dictionary<TKey,
TValue>.KeyCollection.
to convert a dictionary keys to array, first we need to get the dictionary keys by its 'Keys' property. this property return acollection (generic list) of dictionary keys. after getting the List<T>, we can convert it to an array by List class ToArray() method.
List<T>.ToArray() method allow us to copy the elements of the List<T> to a new array. so we can convert the dictionary keys into array asDictionary<TKey, TValue>.Keys.ToArray().
the following asp.net c# example code demonstrate us how can we convert dictionary keys to an array programmaticallyat run time in an asp.net application.
to convert a dictionary keys to array, first we need to get the dictionary keys by its 'Keys' property. this property return acollection (generic list) of dictionary keys. after getting the List<T>, we can convert it to an array by List class ToArray() method.
List<T>.ToArray() method allow us to copy the elements of the List<T> to a new array. so we can convert the dictionary keys into array asDictionary<TKey, TValue>.Keys.ToArray().
the following asp.net c# example code demonstrate us how can we convert dictionary keys to an array programmaticallyat run time in an asp.net application.
ConvertDictionaryKeysIntoArray.aspx
<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Import Namespace="System.Collections.Generic" %>
<!DOCTYPE html>
<script runat="server">
protected void Button1_Click(object sender, System.EventArgs e)
{
Dictionary<string, string> colors = new Dictionary<string, string>();
colors.Add("Fuchsia", "#FF00FF");
colors.Add("GoldenRod", "#DAA520");
colors.Add("Lavender", "#E6E6FA");
colors.Add("LightGreen", "#90EE90");
Label1.Text = "Dictionary Keys | Values.....<br />";
foreach(KeyValuePair<string,string> pair in colors)
{
Label1.Text += "Key= "+pair.Key +" | Value= "+ pair.Value + "<br />";
}
string[] colorKeyArray = colors.Keys.ToArray();
Label1.Text += "<br />Color Array Items....";
foreach (string color in colorKeyArray)
{
Label1.Text += "<br />" + color;
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>How to convert Dictionary Keys into array</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2 style="color:Crimson; font-style:italic;">
System.Collections.Generic.Dictionary
<br /> How to convert Dictionary Keys into array
</h2>
<hr width="450" align="left" color="DeepPink" />
<br />
<asp:Label
ID="Label1"
runat="server"
ForeColor="DodgerBlue"
Font-Names="Courier New"
Font-Size="X-Large"
Font-Italic="true"
>
</asp:Label>
<br /><br />
<asp:Button
ID="Button1"
runat="server"
OnClick="Button1_Click"
Text="Convert Dictionary Keys into array"
Height="45"
Font-Bold="true"
ForeColor="Navy"
/>
</div>
</form>
</body>
</html>
