Questions tagged [anonymous-delegates]
39 questions
22
votes
4 answers
Anonymous delegate as function parameter
I'm trying to pass parameter, which is anonymous delegate (no input parameters, no return value), to function.
Something like this:
private function DoSomething(delegate cmd)
{
cmd();
}
Then, I'm want to use this function to call function in…
No1Lives4Ever
- 6,430
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- 140
10
votes
2 answers
Dispatcher.Invoke with anonymous delegate works in Silverlight but not WPF
In Silverlight 4 I have a custom service class which has an asynchronous Completed event. Inside the Completed event I take the returned data and invoke a populate method via something like this:
private void service_Completed(object sender,…
Edward J. Stembler
- 103
- 1
- 1
- 4
10
votes
2 answers
type arguments can't be inferred from the usage for higher-order function
I have the following higher-order function:
public static Func Not(Func otherFunc)
{
return arg => !otherFunc(arg);
}
And trying to call it like that:
var isValidStr = LinqUtils.Not(string.IsNullOrWhiteSpace);
Compiler…
Grozz
- 8,317
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6
votes
2 answers
Why is casting to a generic type slower than an explicit cast in C#?
I'm building a message dispatch map in C# and mostly just playing around with some different approaches. I am curious about a performance difference I am measuring, but it's not obvious why from looking at the IL.
The message map:
delegate void…
Chronic Game Programmer
- 196
- 1
- 3
6
votes
3 answers
Passing in an anonymous delegate to a thread...why does this work?
In my program, we split up a large amount of data that needs to be looked over across four threads.
Thread one = new Thread(delegate() { NewMethod(recordsSplitIntoQuarters[0], param2, param3, param4, param5); });
Thread two = new Thread(delegate()…
seekerOfKnowledge
- 524
- 5
- 25
5
votes
5 answers
Anonymous Delegates and generic Lists in C#
Can you explain me code below :
private static List _Posts;
public static Post GetPost(Guid id)
{
return _Posts.Find(delegate(Post p)
{
return p.Id == id;
});
}
What is the point to find an object in a generic list by…
Canavar
- 47,715
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4
votes
1 answer
Anonymous delegate not using new local for every iteration when data on local stackalloc
When using anonymous delegates in C# the CLR will generate a copy of the local (e.g. variables in the current scope) on the heap for used variables. Such a local will be put onto the heap for every declared variable of the current scope.
You can see…
Matthias
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- 25
4
votes
2 answers
Is it possible to get the method body (text) of an Action?
I have a circumstance where I have enqueued a number of Action objects and I have a threadpool working through each Action. However, if the application shuts down before the queue is empty, I would like to log what is remaining in the queue before…
Mark Avenius
- 13,679
- 6
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- 50
4
votes
3 answers
"dynamic" for anonymous delegates?
I wonder if there is a possibility to make the "dynamic" type for variables work for anonymous delegates.
I've tried the following:
dynamic v = delegate() {
};
But then I got the following error message:
Cannot convert anonymous method to type…
Van Coding
- 24,244
- 24
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3
votes
3 answers
Can I return a reference to new object instance from a C# delegate?
I'm learning/experimenting with some functional patterns within C# and I've hit a bump I can't quite explain. I'm sure it's a simple answer (I hope) but I'm struggling to see it. Likely has to do with closures, etc and my inability to get…
robcom88
- 63
- 1
- 6
2
votes
2 answers
C# anonymus delegates efficiency/safety
I have progress form which delegate:
// in ProgressForm thread
public delegate void executeMethod(object parameters);
private executeMethod method;
public object parameters;
// ...
private void ProgressForm_Shown(object…
Przemysław Michalski
- 9,627
- 7
- 31
- 37
2
votes
2 answers
Please help me understand anonymous delegates?
I've downloaded the VCSharpSample pack from Microsoft and started reading on Anonymous Delegates. I can more or less understand what the code is doing, but I don't understand the reason behind it. Maybe if you gave me some examples where it would…
Sergio Tapia
- 40,006
- 76
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2
votes
2 answers
how to use anonymous generic delegate in C# 2.0
I have a class called NTree:
class NTree
{
delegate bool TreeVisitor(T nodeData);
public NTree(T data)
{
this.data = data;
children = new List>();
_stopTraverse = false;
}
...
…
char m
- 7,840
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2
votes
6 answers
lambda expressions in C#?
I'm rather new to these could someone explain the significance (of the following code) or perhaps give a link to some useful information on lambda expressions? I encounter the following code in a test and I am wondering why someone would do…
Matt
- 303
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2
votes
1 answer
NCalc creating custom functions in vb.net
What is the equivalent code for creating a custom function in vb2010 instead of c#?
Expression e = new Expression("SecretOperation(3, 6)");
e.EvaluateFunction += delegate(string name, FunctionArgs args)
{
if (name ==…
user3557528
- 21
- 1