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Cast lambda in delegate


Cast lambda in delegate

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Cast lambda in delegate
Tag : chash , By : appdelivery
Date : November 25 2020, 09:00 AM

this one helps. Generally spoken, the compiler is confused about the type of the lambda expression. Either cast it or use a constuctor to clarify. But in this case Where is in fact an extension method to IEnumerables, defined in the class Enumerable (note the difference!). Change your code as follows:
Contexte contexte = new Contexte();
var listField = contexte.GetType().GetField("<offre_Stages>_k__BackingField", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
// either:
IEnumerable<OS> fldVal = (IEnumerable<OS>)listField.GetValue(contexte); // don't use ``dynamic`` as we know it's an ``IEnumerable`1``
fldVal.Where(os => os.id == 1);
// or:
dynamic fldVal = listField.GetValue(contexte);
Enumerable.Where((IEnumerable<OS>)fldVal, os => os.id == 1); // explicit call to the extension method

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Why must a lambda expression be cast when supplied as a plain Delegate parameter


Tag : chash , By : Waynew
Date : March 29 2020, 07:55 AM
should help you out A lambda expression can either be converted to a delegate type or an expression tree - but it has to know which delegate type. Just knowing the signature isn't enough. For instance, suppose I have:
public delegate void Action1();
public delegate void Action2();

...

Delegate x = () => Console.WriteLine("hi");
public static void Invoke(this Control control, Action action)
{
    control.Invoke((Delegate) action);
}

Is it possible to cast a delegate instance into a Lambda expression?


Tag : chash , By : barefootChild
Date : March 29 2020, 07:55 AM
it fixes the issue Everywhere that you're using the term "lambda expression" you actually mean "expression tree".
A lambda expression is the bit in source code which is
parameters => code
x => x * 2

cast delegate type to Delegate and call EndInvoke


Tag : chash , By : boonchew
Date : March 29 2020, 07:55 AM
should help you out You can use reflection to access the EndInvoke() method of the delegate:
using System.Reflection;

private void MonitorTasks(Delegate theDelegate, List<IAsyncResult> returnTags) 
{ 
    MethodInfo endInvoke = theDelegate.GetType().GetMethod("EndInvoke",
        new Type[] { typeof(IAsyncResult) });
    foreach (IAsyncResult returnTag in returnTags) {
        MessageType message = (MessageType) endInvoke.Invoke(theDelegate,
            new object[] { returnTag });
        messages.Add(message);
    } 
}

Type Cast error from lambda to delegate


Tag : chash , By : Thaweesak Suksuwan
Date : March 29 2020, 07:55 AM
around this issue New answer with edited question
The problem is that your lambda expression isn't valid - you're trying to use collection initializer syntax, but your type isn't a collection. So instead of this:
() => new t_user_audit { client.GetAudit(10) }
() => new List<t_user_audit> { client.GetAudit(10) }
public t_User GetAudit(int something)
lazyList = new Lazy<List<t_User>>(() => new List<t_User> { client.GetAudit(10) });
lazyList = new Lazy<List<t_User>>(() => client.GetAudit(10).ToList());

If we can assign a Lambda expression to a delegate type .Does Lambda expression converted to a delegate internally


Tag : development , By : rhyhann
Date : March 29 2020, 07:55 AM
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