C# 3.0 ("C# Orcas") introduces several language extensions that build on C# 2.0 to support the creation and use of higher order, functional style class libraries. The extensions enable construction of compositional APIs that have equal expressive power of query languages in domains such as relational databases and XML. Use this tag if your question specifically pertains to C# 3.0 specific features. Otherwise, just use the C# Tag.
I am working on a WPF, C# 3.0 project, and I get this error:
Error 1 Metadata file
'WORK=- \Tools\VersionManagementSystem\BusinessLogicLayer\bin\Debug
\BusinessLogicLayer.dll' could not be found C:\-=WORK=-…
Right, so I have an enumerable and wish to get distinct values from it.
Using System.Linq, there's, of course, an extension method called Distinct. In the simple case, it can be used with no parameters, like:
var distinctValues =…
Using reflection, how can I get all types that implement an interface with C# 3.0/.NET 3.5 with the least code, and minimizing iterations?
This is what I want to re-write:
foreach (Type t in this.GetType().Assembly.GetTypes())
if (t is…
Given a datasource like that:
var c = new Car[]
{
new Car{ Color="Blue", Price=28000},
new Car{ Color="Red", Price=54000},
new Car{ Color="Pink", Price=9999},
// ..
};
How can I find the index of the first car satisfying a certain condition…
I'm working on a little something and I am trying to figure out whether I can load an XDocument from a string. XDocument.Load() seems to take the string passed to it as a path to a physical XML file.
I want to try and bypass the step of first having…
I have quickly read over the Microsoft Lambda Expression documentation.
This kind of example has helped me to understand better, though:
delegate int del(int i);
del myDelegate = x => x * x;
int j = myDelegate(5); //j = 25
Still, I don't…
Background: Over the next month, I'll be giving three talks about or at least including LINQ in the context of C#. I'd like to know which topics are worth giving a fair amount of attention to, based on what people may find hard to understand, or…
There is a lot of talk about monads these days. I have read a few articles / blog posts, but I can't go far enough with their examples to fully grasp the concept. The reason is that monads are a functional language concept, and thus the examples are…
I'm trying to use LINQ to return a list of ids given a list of objects where the id is a property. I'd like to be able to do this without looping through each object and pulling out the unique ids that I find.
I have a list of objects of type…
I am looking for good ideas for implementing a generic way to have a single line (or anonymous delegate) of code execute with a timeout.
TemperamentalClass tc = new TemperamentalClass();
tc.DoSomething(); // normally runs in 30 sec. Want to error…
I realize that it seems to be a duplicate of What is the difference between a Field and a Property in C#? but my question has a slight difference (from my point of view):
Once I know that
I will not use my class with "techniques that only works on…
A coworker asked me today how to add a range to a collection. He has a class that inherits from Collection. There's a get-only property of that type that already contains some items. He wants to add the items in another collection to the property…
Take the method System.Windows.Forms.Control.Invoke(Delegate method)
Why does this give a compile time error:
string str = "woop";
Invoke(() => this.Text = str);
// Error: Cannot convert lambda expression to type 'System.Delegate'
// because it is…
In my query string, I have an age variable ?age=New_Born.
Is there a way I can check if this string value New_Born is in my Enum list
[Flags]
public enum Age
{
New_Born = 1,
Toddler = 2,
Preschool = 4,
Kindergarten = 8
}
I could…
I usually create a sequence from a single value using array syntax, like this:
IEnumerable sequence = new string[] { "abc" };
Or using a new List. I'd like to hear if anyone has a more expressive way to do the same thing.
