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1答案
990 次观看

如何用VB.NET计算部分匹配的单词的出现次数?

我正在使用 VB 9.0 拆分文本文件,然后计算术语<sequence>的出现次数。假设我还想对同一术语以不同格式的出现次数进行计数,例如<sequence,然后将它们分组在一起,以便将结果输出到文本框,即 txtMyTerms.Text=<sequence>+<sequence 该怎么做?我当前的代码如下: Dim str As String = txtSource.Text Dim arr As String() = str.Split(Nothing) Dim searchTerm As String = "...

0
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1答案
107 次观看

Linq query help

I'm attempting to write a linq query which uses several tables of related data and have gotten stuck. The expected result: I need to return the three most populous metropolitan areas per region by population descending. tables w/sample data: MetroAreas -- ID, Name 2, Greater New York Cities -...

37
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1答案
21464 次观看

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19
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4答案
19844 次观看

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如果我使用扩展方法语法,以下查询将如何显示? var query = from c in checks group c by string.Format("{0} - {1}", c.CustomerId, c.CustomerName) into customerGroups select new { Customer = customerGroups.Key, Payments = customerGroups }

66
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7答案
32834 次观看

扩展方法语法vs查询语法

如果有足够的时间使用带有lambda表达式的标准linq关键字或linq扩展方法,我正在尝试解决。他们似乎做同样的事情,只是写法不同。纯粹是风格问题吗? var query = from p in Products where p.Name.Contains("foo") orderby c.Name select p; // or with extension methods: var query = Products .Where(p => p.Name.Contains("foo")) .OrderBy(p => p.Nam...