.NET2.0のWebBrowserでHTMLを解析

WebBrowserのNavigateメソッドは非同期で動くので、コールしたあとすぐにはページが読み込まれておらず解析できない。そこでReadyStateがCompleteになるまで待てば解析できる。まつにはDoEventを使う。

タグの数を数えるプログラム（C#）

private void button1_Click(object sender, EventArgs e)
{
    webBrowser1.Navigate(@"http://ambiesoft.com/blog/archives/1603");

    while (webBrowser1.ReadyState != WebBrowserReadyState.Complete)
    {
        Application.DoEvents();
    }

    HtmlDocument doc = webBrowser1.Document;
    System.Collections.Generic.Dictionary<string, int> tagcounter = new Dictionary<string, int>();
    foreach(HtmlElement elm in doc.All)
    {
        int val;
        if (!tagcounter.TryGetValue(elm.TagName, out val))
            val = 0;

        tagcounter[elm.TagName] = val + 1;
    }

    StringBuilder sb = new StringBuilder();
    foreach(KeyValuePair<string,int> kv in tagcounter)
    {
        sb.Append(kv.Key);
        sb.Append(" : ");
        sb.Append(kv.Value);
        sb.AppendLine();
    }

    MessageBox.Show(sb.ToString());
}

private void button1_Click(object sender, EventArgs e)

{

webBrowser1.Navigate(@"http://ambiesoft.com/blog/archives/1603");

while (webBrowser1.ReadyState != WebBrowserReadyState.Complete)

{

Application.DoEvents();

}

HtmlDocument doc = webBrowser1.Document;

System.Collections.Generic.Dictionary<string, int> tagcounter = new Dictionary<string, int>();

foreach(HtmlElement elm in doc.All)

{

int val;

if (!tagcounter.TryGetValue(elm.TagName, out val))

val = 0;

tagcounter[elm.TagName] = val + 1;

}

StringBuilder sb = new StringBuilder();

foreach(KeyValuePair<string,int> kv in tagcounter)

{

sb.Append(kv.Key);

sb.Append(" : ");

sb.Append(kv.Value);

sb.AppendLine();

}

MessageBox.Show(sb.ToString());

}

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