c# - How to convert a string array to a string

Convert a String Array to a String
The Array class provides methods for creating, manipulating, searching, and sorting arrays. The Array class is not part of the System.Collections namespaces. However, it is still considered a collection because it is based on the IList interface. An element is a value in an Array. The length of an Array is the total number of elements it can contain. The Array has a fixed capacity.

The following .net c# tutorial code demonstrates how we can convert a String Array instance to a String object. That means we will get a String instance from the elements of a String Array. Here we will join the String Array elements with a separator and build an instance of the String object. In this .net c# example code, we will use the String class Join() method.

The String Join() method concatenates the elements of a specified array or the members of a collection, using the specified separator between each element or member.

The String Join(String, String[]) method overload concatenates all the elements of a string array, using the specified separator between each element. The Join (string? separator, params string?[] value) method overload has two parameters named separator and value. The separator parameter is the string to use as a separator. The separator is included in the returned string only if the value has more than one element. The value parameter is an Array that contains the elements to concatenate.

So, using this method overload we can join String Array elements to a String object. Here we will pass an empty String for the separator parameter and the String Array for the value parameter. The String(separator, value) method overload returns a string that consists of the elements in value delimited by the separator string or an empty String if provided String Array contains zero elements.

The String Join(string? separator, params string?[] value) method overload throws ArgumentNullException if the value is null. It also throws OutOfMemoryException if the length of the resulting string overflows the maximum allowed length (Int32.MaxValue).

So finally, using this String class Join(String, String[]) method overload the .net c# developers can convert a String Array to a String.
convert-string-array-to-string.aspx

<%@ Page Language="C#" AutoEventWireup="true"%>    
    
<!DOCTYPE html>    
<script runat="server">  
    protected void Button1_Click(object sender, System.EventArgs e)    
    {  
        string[] stringarray = new string[]  
        {  
            "how",  
            "are",  
            "you"
        };  
  
        Label1.Text = "string array.........<br />";  
        foreach (string s in stringarray)  
        {  
            Label1.Text += s + "<br />";  
        }

        string convertedstring = String.Join("", stringarray);
        Label1.Text += "<br />string array to converted string: " + convertedstring;
    }    
</script>    
    
<html xmlns="http://www.w3.org/1999/xhtml">    
<head id="Head1" runat="server">    
    <title>c# example - string array to string</title>    
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<body>    
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    <div>    
        <h2 style="color:DarkBlue; font-style:italic;">    
            c# example - string array to string
        </h2>    
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            ID="Label1"     
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            Font-Size="Large"    
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        <br /><br />  
        <asp:Button     
            ID="Button1"     
            runat="server"     
            Text="convert string array to string"    
            OnClick="Button1_Click"  
            Height="40"    
            Font-Bold="true"    
            />    
    </div>    
    </form>    
</body>    
</html>
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