C# Webサイト読込 – テックメモ

レンダリングがIEになるようで、IEのバージョン変更はレジストリからのみ。
毎回、DocumentCompletedが走るので無限ループになってしまったりするので注意。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
            webBrowser1.ScriptErrorsSuppressed = true;
            webBrowser1.Navigate("https://weather.yahoo.co.jp/weather/jp/xxx");
            webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(tenki);
        }

        private void tenki(object sender, WebBrowserDocumentCompletedEventArgs e)
        {

            HtmlElementCollection hec = webBrowser1.Document.All;

            foreach (HtmlElement he in hec)
            {

                if (he.GetAttribute("className").ToString() == "forecastCity")
                {
                    /* 以下のように直接CSSを書いても大丈夫
                    webBrowser1.DocumentText =
                        "<style>" +
                        "*{font: normal 12px;}" +
                        "th,tr,td{padding: 10px; border: 1px solid #ccc;}" +
                        "table{border-collapse: collapse; text-align: center}" +
                        "</style>" +
                        "<table>" + he.InnerHtml + "</table>";
                    */
                    webBrowser1.DocumentText = "<html><head>" +
                        "<link rel='stylesheet' href='//s.yimg.jp/images/weather/pc/v2/css/weatherCommon-2.1.0.css'>" + 
                        "<link href='https://s.yimg.jp/yui/jp/mh/pc/1.4.8/css/std.css' rel='stylesheet' type='text/css' media='all'>" + 
                        "</head>" +
                        "<body><div>" + he.InnerHtml + "</div></body></html>";

                }
            }
        }
    }
}

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace WindowsFormsApp1

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

webBrowser1.ScriptErrorsSuppressed = true;

webBrowser1.Navigate("https://weather.yahoo.co.jp/weather/jp/xxx");

webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(tenki);

}

private void tenki(object sender, WebBrowserDocumentCompletedEventArgs e)

{

HtmlElementCollection hec = webBrowser1.Document.All;

foreach (HtmlElement he in hec)

{

if (he.GetAttribute("className").ToString() == "forecastCity")

{

/* 以下のように直接CSSを書いても大丈夫

webBrowser1.DocumentText =

"<style>" +

"*{font: normal 12px;}" +

"th,tr,td{padding: 10px; border: 1px solid #ccc;}" +

"table{border-collapse: collapse; text-align: center}" +

"</style>" +

"<table>" + he.InnerHtml + "</table>";

webBrowser1.DocumentText = "<html><head>" +

"<link rel='stylesheet' href='//s.yimg.jp/images/weather/pc/v2/css/weatherCommon-2.1.0.css'>" +

"<link href='https://s.yimg.jp/yui/jp/mh/pc/1.4.8/css/std.css' rel='stylesheet' type='text/css' media='all'>" +

"</head>" +

"<body><div>" + he.InnerHtml + "</div></body></html>";

}

こんな感じで読み込むことも可能。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        Boolean isLoad = false;

        public Form1()
        {
            InitializeComponent();

            webBrowser1.ScriptErrorsSuppressed = true;
            
            webBrowser1.Navigate("xxx");
            webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(LoadPage);

            timer1.Start();
        }

        private void LoadPage(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            if (isLoad== true) return;

            HtmlElementCollection hec = webBrowser1.Document.Body.All;

            string body = "";

            //class
            foreach(HtmlElement he in hec)
            {
                if(he.GetAttribute("className").ToString() == "xxx")
                {
                    body += he.InnerHtml;
                }
            }

            /* ID
            foreach (HtmlElement he in hec)
            {
                if (he.Id == "xxx") body += he.InnerHtml;
            }
            */

            webBrowser1.Document.Body.InnerHtml = body;
            isLoad = true;

        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            this.Text = DateTime.Now.ToString();

            if (isLoad == true && DateTime.Now.Minute.ToString() == "59" && DateTime.Now.Second.ToString() == "59") isLoad = false;
            if (isLoad == false && DateTime.Now.Minute.ToString() == "1" && DateTime.Now.Second.ToString() == "1") webBrowser1.Refresh();

        }
    }
}

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace WindowsFormsApp1

{

public partial class Form1 : Form

{

Boolean isLoad = false;

public Form1()

{

InitializeComponent();

webBrowser1.ScriptErrorsSuppressed = true;

webBrowser1.Navigate("xxx");

webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(LoadPage);

timer1.Start();

}

private void LoadPage(object sender, WebBrowserDocumentCompletedEventArgs e)

{

if (isLoad== true) return;

HtmlElementCollection hec = webBrowser1.Document.Body.All;

string body = "";

//class

foreach(HtmlElement he in hec)

{

if(he.GetAttribute("className").ToString() == "xxx")

{

body += he.InnerHtml;

}

/* ID

foreach (HtmlElement he in hec)

{

if (he.Id == "xxx") body += he.InnerHtml;

}

webBrowser1.Document.Body.InnerHtml = body;

isLoad = true;

}

private void timer1_Tick(object sender, EventArgs e)

{

this.Text = DateTime.Now.ToString();

if (isLoad == true && DateTime.Now.Minute.ToString() == "59" && DateTime.Now.Second.ToString() == "59") isLoad = false;

if (isLoad == false && DateTime.Now.Minute.ToString() == "1" && DateTime.Now.Second.ToString() == "1") webBrowser1.Refresh();

}