小编inq*_*one的帖子

使用Powershell 3.0时,-Filter或-Include参数是否适用于任何人？我已经尝试了以下两个命令:

Copy-Item -Path c:\temp -Include "*.TXT" -Destination C:\temp2

和

Copy-Item -Path c:\temp -Filter "*.TXT" -Destination C:\temp2

实际上,对于-Filter选项,在c:\ TEMP2中创建一个空的"temp"文件夹.我知道以下命令有效:

Copy-Item -Path c:\temp\*.TXT -Destination C:\temp2

但只是想知道是否有人之前遇到过这个问题？

我正试图从网站上删除产品名称.奇怪的是,我似乎只抓了12件物品.我已经尝试了HtmlAgilityPack和HTTPClient,我得到了相同的随机结果.这是我的HtmlAgilityPack代码:

using HtmlAgilityPack;
using System.Net.Http;

var url = @"http://www.roots.com/ca/en/men/tops/shirts-and-polos/";
HtmlWeb web = new HtmlWeb();
var doc = web.Load(url, "GET", proxy, new NetworkCredential(PROXY_UID, PROXY_PWD, PROXY_DMN));
var nodes = doc.DocumentNode.Descendants("div")
            .Where(div => div.GetAttributeValue("class", string.Empty) == "product-name")
            .Select(div => div.InnerText.Trim())
            ;

[更新1] @CodingKuma建议我试试Selenium Webdriver.这是我使用Selenium Webdriver的代码:

IWebDriver chromeDriver = new ChromeDriver(@"C:\TEMP\Projects\Chrome\chromedriver_win32");
chromeDriver.Url = "http://www.roots.com/ca/en/men/tops/shirts-and-polos/";
var items = chromeDriver.FindElements(By.ClassName("product-name"));
items.Count().Dump();
chromeDriver.Quit();

我尝试了这段代码,但仍然没有运气.该页面上有20多个项目,但我似乎只是随机获得12.如何抓取该网站上的所有项目？

我有一个简单的LINQ lambda连接查询,但我想添加一个带有where子句的第3个连接.我该怎么做呢？

这是我的单个连接查询:

var myList = Companies
    .Join(
        Sectors,
        comp => comp.Sector_code,
        sect => sect.Sector_code,
        (comp, sect) => new {Company = comp, Sector = sect} )
    .Select( c => new {
        c.Company.Equity_cusip,
        c.Company.Company_name,
        c.Company.Primary_exchange,
        c.Company.Sector_code,
        c.Sector.Description
    });

我想将以下SQL命令添加到上面的LINQ查询中并仍然保持投影:

SELECT
    sector_code, industry_code 
FROM
    distribution_sector_industry 
WHERE
    service = 'numerical'

第3次连接将使用Sector_code上的Sector表和Distribution_sector_industry进行.

提前致谢.

我正在使用LINQPad,我想知道表的架构细节.

我知道我是用SQL做的:

SELECT column_name,* 
FROM information_schema.columns
WHERE table_name = '{table_name}'
ORDER BY ordinal_position

我怎么能用LINQ做到这一点？

我发现这段代码将我的数据结果导出到Excel:

List<User> users  = ....
var filename = "test.html";

var writer = LINQPad.Util.CreateXhtmlWriter();
writer.Write(users);

System.IO.File.WriteAllText(filename, writer.ToString());

// Open the file in excel
Process.Start("Excel" , filename); 

这将以格式化模式导出数据.什么是复制只是"导出>导出到Excel"的代码？

也许是深夜,但我在这里难倒.我正在尝试将具有相同属性的多个列表合并为一个.我认为LINQ的.UNION可以做到这一点,但我错了.这是我的一些列表的示例:

LIST1 (report names):
Date      Name    Title         Product
02/01/13  Steve   Hello World   Report
02/05/13  Greg    Howdy         Report

LIST2 (song names):
Date      Name    Title         Product
01/01/13  John    Time          Song
01/05/13  Bob     Sorry         Song

LIST3 (games names):
Date      Name      Title         Product
12/01/12  Google    Bike Race     Game
12/05/12  Apple     Temple Run    Game

我的课非常简单.这是它的样子:

public class MyClass {
  public DateTime Date { get; set; }
  public string Name { get; set; }
  public string Title { get; set; }
  public string Product { get; …

我有一个MongoDB集合.这是源数据的网格(excel)视图.

如果"fstick"列中的值与同一集合中"sedol"列的值匹配,我只想返回一个列表.最后,我想要这个:

这是我到目前为止所尝试的:

var list1 = collection.AsQueryable();
var list2 = collection.AsQueryable();
var docs = list1.Where(c => list2.Any(a => a.Sedol == c.FSTicker));

还有这个:

var docs = collection.AsQueryable()
        .Where(c => c.FSTicker.Contains(c.Sedol));

每次,我都会收到以下错误:

System.ArgumentException: Unsupported filter: {document}{fstick}.Contains({document}{sedol}).
at MongoDB.Driver.Linq.Translators.PredicateTranslator.Translate(Expression node)
at MongoDB.Driver.Linq.Translators.PredicateTranslator.Translate(Expression node, IBsonSerializerRegistry serializerRegistry)
at MongoDB.Driver.Linq.Translators.QueryableTranslator.TranslateWhere(WhereExpression node)
at MongoDB.Driver.Linq.Translators.QueryableTranslator.Translate(Expression node)
at MongoDB.Driver.Linq.Translators.QueryableTranslator.TranslatePipeline(PipelineExpression node)
at MongoDB.Driver.Linq.Translators.QueryableTranslator.Translate(Expression node)
at MongoDB.Driver.Linq.Translators.QueryableTranslator.Translate(Expression node, IBsonSerializerRegistry serializerRegistry)
at MongoDB.Driver.Linq.MongoQueryProviderImpl`1.Translate(Expression expression)
at MongoDB.Driver.Linq.MongoQueryProviderImpl`1.Execute(Expression expression)
at MongoDB.Driver.Linq.MongoQueryableImpl`2.GetEnumerator()

以防万一,这是我的班级:

[BsonIgnoreExtraElements]
public class Datapull
{
    [BsonElement("fstick")]
    public string FSTicker { get; set; …

这是我的json字符串.

{
    "?xml" : {
        "@version" : "1.0",
        "@encoding" : "UTF-8"
    },
    "DataFeed" : {
        "@FeedName" : "issuerDetails",
        "SecurityDetails" : {
            "Security" : {
                "SecurityID" : {
                    "@idValue" : "AAPL-NSDQ",
                    "@fiscalYearEnd" : "2016-12-31T00:00:00.00"
                },
                "FinancialModels" : {
                    "FinancialModel" : [{
                            "@id" : "780",
                            "@name" : "Estimates - Energy",
                            "@clientCode" : "A",
                            "Values" : [{
                                    "@name" : "EBITDA",
                                    "@clientCode" : "EBITDA",
                                    "@currency" : "C$",
                                    "Value" : [{
                                            "@year" : "2014",
                                            "#text" : "555.64"
                                        }, {
                                            "@year" : "2015",
                                            "#text" : "-538.986" …

我想尝试我的手和webscraping.我注意到Anglesharp非常适合.Net环境.我正在尝试从yelp网站获取所有描述和评级的列表,我不会收到任何错误或任何结果.这是html的一部分(在" https://www.yelp.ca/biz/walmart-toronto-12 "中更详细):

<div class="rating-very-large">
    <i class="star-img stars_2" title="2.0 star rating">
        <img alt="2.0 star rating" class="offscreen" height="303" src="//s3-media4.fl.yelpcdn.com/assets/srv0/yelp_styleguide/c2252a4cd43e/assets/img/stars/stars_map.png" width="84">
    </i>
        <meta itemprop="ratingValue" content="2.0">
</div>
<p itemprop="description" lang="en">This Walmart still terrifies me<br><br>Baby things can be found on the back right of the lower level. Godspeed.</p> 

<div class="rating-very-large">
    <i class="star-img stars_1" title="1.0 star rating">
        <img alt="1.0 star rating" class="offscreen" height="303" src="//s3-media4.fl.yelpcdn.com/assets/srv0/yelp_styleguide/c2252a4cd43e/assets/img/stars/stars_map.png" width="84">
    </i>
        <meta itemprop="ratingValue" content="1.0">
</div>
<p itemprop="description" lang="en">Wow I don&#39;t even know where to begin, </p> 

这是我的查询:

var config = …

我有一个非常简单的LinqToSql列表.

var list = DB.Where(c => c.Status.Equals("active")).Select(c => c.Name);

我正在尝试将该列表导入MongoDB.这是我到目前为止所拥有的:

const string connectionString = "mongodb://localhost";
var client = new MongoClient(connectionString);
MongoServer server = client.GetServer();
MongoDatabase database = server.GetDatabase("test");
var collection = database.GetCollection("salesppl");
collection.Insert(list);

我也尝试过InsertBatch和Save,但没有运气.以下是我为每个错误消息:InsertBatch

BsonSerializationException:Serializer StringSerializer期望序列化选项类型为RepresentationSerializationOptions,而不是DocumentSerializationOptions.

插入

BsonSerializationException:Serializer EnumerableSerializer期望ArraySerializationOptions类型的序列化选项,而不是DocumentSerializationOptions.

保存

InvalidOperationException:Save只能用于具有Id的文档.

注意: 我认为这没有任何意义,但我通过LinqPad这样做.

那么,如何将此列表保存到MongoDb？