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Linq: What is the difference between Select and Where
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Where
finds items that match and only returns those that do (filtering).
-> IEnumerable<A> in, IEnumerable<A> out
Select
returns something for all items in the source (projection / transformation). That something might be the items themselves, but are more usually a pr...
How to use ng-repeat for dictionaries in AngularJs?
...
You can use
<li ng-repeat="(name, age) in items">{{name}}: {{age}}</li>
See ngRepeat documentation. Example: http://jsfiddle.net/WRtqV/1/
share
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How to test code dependent on environment variables using JUnit?
...ting for Maven based project. Below is the entry I made in POM file.
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
...
WPF: ItemsControl with scrollbar (ScrollViewer)
...ollbar for an ItemsControl, you can host it in a ScrollViewer like this:
<ScrollViewer VerticalScrollBarVisibility="Auto">
<ItemsControl>
<uc:UcSpeler />
<uc:UcSpeler />
<uc:UcSpeler />
<uc:UcSpeler />
<uc:UcSpeler />
</ItemsContr...
Why use static_cast(x) instead of (int)x?
... that classic C casts make no distinction between what we call static_cast<>(), reinterpret_cast<>(), const_cast<>(), and dynamic_cast<>(). These four things are completely different.
A static_cast<>() is usually safe. There is a valid conversion in the language, or an...
Reading Excel files from C#
...and build structs from the fields.
var query = data.Where(x => x.Field<string>("phoneNumber") != string.Empty).Select(x =>
new MyContact
{
firstName= x.Field<string>("First Name"),
lastName = x.Fie...
setMaxResults for Spring-Data-JPA annotation?
... into my project.
One thing that confuses me is how do I achieve setMaxResults(n) by annotation ?
8 Answers
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LINQ query on a DataTable
...e's Rows collection, since DataRowCollection doesn't implement IEnumerable<T>. You need to use the AsEnumerable() extension for DataTable. Like so:
var results = from myRow in myDataTable.AsEnumerable()
where myRow.Field<int>("RowNo") == 1
select myRow;
And as @Keith says, you'll need...
C# “internal” access modifier when doing unit testing
...Adding to Eric's answer, you can also configure this in the csproj file:
<ItemGroup>
<AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleTo">
<_Parameter1>MyTests</_Parameter1>
</AssemblyAttribute>
</ItemGroup>
Or if you ha...
Relative frequencies / proportions with dplyr
... 4 1 5 5 0.3846154
From the dplyr vignette:
When you group by multiple variables, each summary peels off one level of the grouping. That makes it easy to progressively roll-up a dataset.
Thus, after the summarise, the last grouping variable specified in group_by, 'gear', is peeled off. ...