c# - How to split a string with specific delimiter to populate an array

String Split() Method

The following asp.net c# example code demonstrate us how can we split a string by specified delimiter and populate an array with splitted elements programmatically at run time in an asp.net application. .Net frameworks String Class represent text as a series of Unicode characters.

String.Split() method return a new string array that contains the substrings in this instance that are delimited by elements of a specified string or Unicode character array. This member is overloaded, those are String.Split(Char[]), Split(Char[], Int32), Split(Char[], StringSplitOptions), Split(Char[], Int32, StringSplitOptions) and Split(String[], Int32, StringSplitOptions).

In this example, we only discuss about String.Split(Char[]) overloaded method. String.Split(Char[]) method return a string array that contains the substrings in this instance that are delimited by elements of a specified Unicode character array. This method require to pass a parameter named 'separator' which type is System.Char[]. This parameter value represent an array of Unicode characters that delimit the substrings in this instance, an empty array that contains no delimiters or null.

String.Split(Char[]) method return value type is System.String[] which represent a string array whose elements contain in the substrings in this instance that are delimited by one or more characters in parameter value.

In the following example, we initializes a string object with value, whose substrings are separated by '.' (dot). Then we call the String.Split(Char[]) method and pass the parameter value (Char Array) to it. We specify that the string will be splitted by the character '.' (dot) and create an array with elements.

Split.aspx


<%@ Page Language="C#" %>

<!DOCTYPE html>

<script runat="server">
    protected void page_Load(object sender, System.EventArgs e) {
        if(!this.IsPostBack)
        {
            TextBox1.Text = "Red.Green.Blue.HotPink.Pink";
            TextBox1.Width = 250;
        }
    }
    protected void Button1_Click(object sender, System.EventArgs e) {
        string myString = TextBox1.Text.ToString();
        char[] separator = new char[] {'.'};
        string[] colorList = myString.Split(separator);
        ListBox1.DataSource = colorList;
        ListBox1.DataBind();
        ListBox1.Height = 100;
        Label1.Text = "String split and populate ListBox successfully!";
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to split a string with specific delimiter and populate an array in asp.net</title>
</head> 
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Teal">asp.net string example: Split</h2>
        <asp:Label 
             ID="Label1" 
             runat="server" 
             Font-Size="Large"
             ForeColor="HotPink"
             Font-Bold="true"
             Font-Italic="true"
             >
        </asp:Label>
        <br /><br />
        <asp:ListBox 
             ID="ListBox1" 
             runat="server" 
             BackColor="DodgerBlue" 
             ForeColor="AliceBlue"
             >
        </asp:ListBox>
        <br /><br />
        <asp:Label 
             ID="Label2" 
             runat="server" 
             Text="Test String"
             ForeColor="DarkGreen"
             >
        </asp:Label>
        <asp:TextBox 
             ID="TextBox1" 
             runat="server" 
             BackColor="DarkSeaGreen" 
             ForeColor="DarkGreen"
             >
        </asp:TextBox>
        <br /><br />
        <asp:Button 
             ID="Button1" 
             runat="server" 
             OnClick="Button1_Click"
             Font-Bold="true"
             Text="Split String And Populate ListBox"
             ForeColor="DarkGreen"
             />   
    </div>
    </form>
</body>
</html>

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