[英]C# code to wait until webpage finishes loading
我一輩子都想不通如何讓我的C#代碼等到網頁完成加載。 我什至無法接近ie.documentcompleted或ie.documentcomplete。 實際上,即使我引用的是system.windows.forms程序集,我也無法使用VS2012作為下拉選項為我提供documentcomplete。 請幫忙。
謝謝
public static string getTheBlockArray()
{
SHDocVw.InternetExplorer IE = new SHDocVw.InternetExplorer();
string id = "resultsTable";
object Empty = 0;
object URL = "http://www.cmegroup.com/clearing/trading-practices/block-data.html#contractTypes=FUT,OPT,SPD&exchanges=XCME&assetclass=assetClassId=1,6";
IE.Navigate2(ref URL, ref Empty, ref Empty, ref Empty, ref Empty);
// Some code here to wait until the webpage loads
object theRange = IE.Document.getelementbyID(id).innertext;
string blockString = theRange.ToString();
IE.Quit();
return blockString;
}
嘗試這個:
while(IE.Busy)
{
//You might want to sleep or count or something.
//System.Threading.Thread.Sleep(1000);
}
IE.Completed無法正常工作嗎?
如果可以,您可以嘗試執行以下操作:
IE.completed += (s, e) => {
// your code
};
javascript代碼通過異步請求填充的resultTable元素的內容。 因此,您不應該處理DOM,而必須像javascript一樣直接查詢數據。 下面的代碼可能是一個很好的起點。
class Program
{
private static readonly string url = "http://www.cmegroup.com/clearing/trading-practices/CmeWS/mvc/xsltTransformer.do?xlstDoc=/XSLT/md/blocks-records.xsl&url=/da/BlockTradeQuotes/V1/Block/BlockTrades?exchange={0}&foi={1}&{2}&tradeDate={3}&sortCol={4}&sortBy={5}&_=1372913232800";
static void Main(string[] args)
{
Exchange exchange = Exchange.XCME;
ContractType contractType = ContractType.FUT | ContractType.OPT | ContractType.SPD;
string assetClass = "assetClassId=0"; // See asset_class dropdown options in HTML source for valid values
DateTime tradeDate = new DateTime(2013, 7, 3);
string sortCol = "time"; // Column to sort
SortOrder sortOrder = SortOrder.desc;
string xml = QueryData(exchange, contractType, assetClass, tradeDate, sortCol, sortOrder);
Console.WriteLine(xml);
}
private static string QueryData(Exchange exchange, ContractType contractType, string assetClass, DateTime tradeDate, string sortCol, SortOrder sortOrder)
{
string exc = GetEnumString(exchange);
string ct = GetEnumString(contractType);
string td = tradeDate.ToString("MMddyyyy");
string query = string.Format(url, exc, ct, assetClass, td, sortCol, sortOrder.ToString());
WebRequest request = WebRequest.Create(query);
request.Credentials = CredentialCache.DefaultCredentials;
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
using (Stream stream = response.GetResponseStream())
{
using (StreamReader reader = new StreamReader(stream))
{
return reader.ReadToEnd();
}
}
}
}
private static string GetEnumString(Enum item)
{
return item.ToString().Replace(" ", "");
}
}
[Flags]
enum Exchange
{
/// <summary>
/// CBOT.
/// </summary>
XCBT = 1,
/// <summary>
/// CME.
/// </summary>
XCME = 2,
/// <summary>
/// COMEX.
/// </summary>
XCEC = 4,
/// <summary>
/// DME.
/// </summary>
DUMX = 8,
/// <summary>
/// NYMEX.
/// </summary>
XNYM = 16
}
[Flags]
enum ContractType
{
/// <summary>
/// Futures.
/// </summary>
FUT = 1,
/// <summary>
/// Options.
/// </summary>
OPT = 2,
/// <summary>
/// Spreads.
/// </summary>
SPD = 4
}
enum SortOrder
{
/// <summary>
/// Ascending.
/// </summary>
asc,
/// <summary>
/// Descending.
/// </summary>
desc
}
結果在xml變量中( 請參閱參考資料)。
祝好運。
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