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Get paragraph between two paragraph in C#

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User29410129 posted

how to get specific paragraph from more than two paragraph in C#. whole line are stored in var

Paragraph 1 start

// multiple line in paragraph 1

Paragraph 1 End

Paragraph 2 start

// multiple line in paragraph 2

Paragraph 2 start

Paragraph 3 start

// multiple line in paragraph 3

Paragraph 3 end

I want to get text between "Paragraph 3 start" and "Paragraph 3 end" from the variable. how i can implement this scenario?

Thursday, July 13, 2017 7:11 AM

Answers

User475983607 posted

Finding text in string requires a delimiter of some sort. Paragraphs are separated by two new line character. Use this fact to split the paragraphs into an array then select the second index, paragraph 3.

namespace ConsoleDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            string text = @"paragraph 1
some text

paragraph 2 

paragraph 3 with text
and a new line";

            string[] paragraphs = text.Split(new string[] { Environment.NewLine + Environment.NewLine }, StringSplitOptions.None);

            Console.WriteLine(paragraphs[2]);
        }


    }
}

Results

paragraph 3 with text
and a new line

Marked as answer by Anonymous Thursday, October 7, 2021 12:00 AM

Thursday, July 13, 2017 10:33 AM

User-707554951 posted

Hi DanyalHaider,

Working code based on your needs:

var MultiParagraphString = @"Paragraph 1 start
line in paragraph 1
line in paragraph 1
Paragraph 1 End
Paragraph 2 start
line in paragraph 2
line in paragraph 2
line in paragraph 2
Paragraph 2 start
Paragraph 3 start 
line in paragraph 3
line in paragraph 3
line in paragraph 3
line in paragraph 3
Paragraph 3 end";
            int par = 3;//get text between "Paragraph 3 start" and "Paragraph 3 end";
            string[] paragraphs = MultiParagraphString.Split(new string[] { "\r\n" }, StringSplitOptions.None);
            List<int> indes = new List<int>();
            for (int i = 0; i < paragraphs.Length; i++) {
                //paragraphs[i].Contains("3")
                if (paragraphs[i].Contains("Paragraph 3 start")) {
                    indes.Add(i);
                }
                if (paragraphs[i].Contains("Paragraph 3 end"))
                {
                    indes.Add(i);
                }
            }
            for (int j = indes[0]+1; j < indes[1]; j++) {
                Response.Write(paragraphs[j]);
            }

Best regards

Cathy

Marked as answer by Anonymous Thursday, October 7, 2021 12:00 AM

Friday, July 14, 2017 2:55 AM

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User1970566204 posted

hi,

may i know your are using (asp.net + c# [web page]) or (c# [win form] ) !?

Thursday, July 13, 2017 9:04 AM
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User29410129 posted

I am using Asp.net + C#

Thursday, July 13, 2017 9:40 AM

User1970566204 posted

working samples;

aspx page

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="paragraph.aspx.cs" Inherits="test.paragraph" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:Literal runat="server" ID="ltrPageContent"></asp:Literal>
        </div>
        <div>
            Enter the Paragraph number :
            <asp:TextBox ID="txtParagraphNumber" runat="server"></asp:TextBox>
        </div>
        <div>
            <asp:Button ID="btnGet" runat="server" Text="Get Paragraph" OnClick="btnGet_Click" /></div>

        requested paragraph ::<asp:Literal ID="ltrRequested" runat="server"></asp:Literal>
    </form>
</body>
</html>

code file

using System;

namespace test
{
    public partial class paragraph : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

            //get Page Content
            var iPageContent = getPageContent();

            //show Page Content
            ltrPageContent.Text = iPageContent;

            //get paragraph
            ltrRequested.Text = getParagraph(iPageContent, 4);              
        }

        private string getPageContent()
        {
            //html tag <p>
            return "<p>paragraph 1..................</p><p>paragraph 2...........</p><p>paragraph 3..........</p>";
        }

        private string getParagraph(string iPageContent ,int Index)
        {
            string[] Spliter = new string[] { "<p>" };
            string[] paragraphs = iPageContent.Split(Spliter, StringSplitOptions.RemoveEmptyEntries);
            return paragraphs.Length >= Index ? paragraphs[Index - 1].ToString().Replace("</p>","") : "specified paragraph not found";
        }

        //based on give paragraph number
        protected void btnGet_Click(object sender, EventArgs e)
        {
           ltrRequested.Text= getParagraph(getPageContent(), Convert.ToInt32(txtParagraphNumber.Text.Trim()));
        }
    }
}

Thursday, July 13, 2017 9:51 AM