Dictionary Clear() Method
.Net framework dictionary Clear() method allow us to remove all keys and values from the Dictionary<TKey, TValue>.
this Dictionary<TKey, TValue>.Clear() method exists under System.Collections.Generic namespace. this method has no optional or required parameter.
the Clear() method implements as ICollection<T>.Clear() and IDictionary.Clear(). this method set the Count property value to 0 (zero) but the Capacity remains unchanged.
the following asp.net c# example code demonstrate us how can we remove all elements from dictionary programmatically at run time in an asp.net application.
the Clear() method implements as ICollection<T>.Clear() and IDictionary.Clear(). this method set the Count property value to 0 (zero) but the Capacity remains unchanged.
the following asp.net c# example code demonstrate us how can we remove all elements from dictionary programmatically at run time in an asp.net application.
DictionaryClearMethod.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("BlanchedAlmond", "#FFEBCD");
colors.Add("Brown", "#A52A2A");
colors.Add("Cornsilk", "#FFF8DC");
colors.Add("FireBrick", "#B22222");
colors.Add("GreenYellow", "#ADFF2F");
Label1.Text = "Dictionary Keys...<br />";
foreach (string color in colors.Keys)
{
Label1.Text += color + "<br />";
}
//Clear() method remove all keys and values from the Dictionary.
colors.Clear();
Label1.Text += "<br />After Call Clear() Method. Dictionary Keys...<br />";
foreach (string color in colors.Keys)
{
Label1.Text += color + "<br />";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Dictionary Clear() Method - How to remove all keys and values from the Dictionary</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2 style="color:Navy; font-style:italic;">
System.Collections.Generic.Dictionary Clear() Method
<br /> How to remove all keys and values from the Dictionary
</h2>
<hr width="550" align="left" color="Navy" />
<br />
<asp:Label
ID="Label1"
runat="server"
ForeColor="SeaGreen"
Font-Names="Courier New"
Font-Size="Large"
>
</asp:Label>
<br />
<asp:Button
ID="Button1"
runat="server"
OnClick="Button1_Click"
Text="Test Dictionary Clear() Method"
Height="45"
Font-Bold="true"
ForeColor="DodgerBlue"
/>
</div>
</form>
</body>
</html>

- How to add an item to a Dictionary
- How to check whether Dictionary contains a specific key
- How to check whether Dictionary contains a specific value
- How to convert a Dictionary to a list
- How to iterate over a Dictionary using foreach loop
- How to initialize a Dictionary
- How to add a key value pair to a Dictionary
- How to sort a Dictionary
- How to sort a Dictionary by key
- How to sort a Dictionary by value