选择webbrowser下拉列表项 [英] Select Item of webbrowser dropdown list

问题描述

您好，



我正在开展一个网页自动化项目。我在这方面很新。我想使用Webbrowser控件来选择下拉列表中的项目。现在，如何从下面的HTML代码段中选择一个项目。我想从这个HTML代码中选择，例如2009：

Hello,

I'm working on a webpage automation project. And I am very new in this. I want to use Webbrowser control to select an item in the dropdownlist. Now,how do I programmetically select an item from the HTML snippet below. I would like to select,say for example,"2009" from this HTML code :

<select name = "yr">
<option value= "">Year</option>
<option>2009</option>
<option>2010</option>
<option>2011</option>
<option>2012</option>
</select>

$ b我的代码中有$ b错误：

error in my code:

dynamic TheItem = (from X in webBrowser1.Document.GetElementsByTagName("select").Cast<HtmlElement>()where X.GetAttribute("name") == "starting_date" X.GetElementsByTagName("option").FirstOrDefault;
if (TheItem != null)
{
    dynamic Item = (from X in TheItem.Cast <HtmlElement>() where X.InnerText == "18").FirstOrDefault;
    if (Item != null)
    {
        Item.SetAttribute("Selected", Convert.ToString(true));
    }
}

错误：

查询正文必须以select子句或group子句结束

error:
A query body must end with a select clause or a group clause

推荐答案

您的LINQ查询不是结构化的正确。试试这个...

Your LINQ query isn't structured correctly. Try this...

var optionItems = (from X in webBrowser1.Document.GetElementsByTagName("select").Cast<HtmlElement>()
where X.GetAttribute("name") == "starting_date" select X.GetElementsByTagName("option"));

if (optionItems != null) 
{
    dynamic optionToSelect = (from X in optionItems.Cast<HtmlElement>() where X.InnerText == "18" select X).FirstOrDefault();

    if (optionToSelect != null) 
    {
        optionToSelect.SetAttribute("Selected", Convert.ToString(true));
    }
}

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