System.Missingmethodexception: Method Not Found

System.MissingMethodException: Method not found?

This is a problem which can occur when there is an old version of a DLL still lingering somewhere around. Make sure that the latest assemblies are deployed and no duplicated older assemblies are hiding in certain folders. Your best bet would be to delete every built item and rebuild/redeploy the entire solution.

System.MissingMethodException: Method not found: '?' when trying to build a custom dynamic type with a delegate method

You're using the wrong dispatch mechanism!

OpCodes.Callvirt is for virtual method calls, eg. overridable instance methods, the resolution of which needs to be deferred until runtime.

For static method invocation you'll want a plain old OpCodes.Call instruction instead:

generator.EmitCall(OpCodes.Call, method, Types.EmptyTypes);

Exception thrown: 'System.MissingMethodException'

Could be several issues. The most common one is that you included the DLL library which is the wrong version (e.g. without the method that's missing). Easiest thing to do is to open the exe in the decompiler (e.g. Reflector) and step through it.

Another issue could be the wrong bitness (but probably not).

System.MissingMethodException Message=Method not found: DryIoc.Rules DryIoc.Rules.WithoutFastExpressionCompiler()

Prism's open source, you can modify parts to use DryIoc 5 and use those dlls.

It's not like you're forced to use nuget packages, they're meant to help. If they hinder, get rid of them.

System.MissingMethodException: Method not found: 'System.String .get_DayName()'

Perhaps you only need to recompile? I ran this code locally and it worked fine.

class Program
{
    static void Main(string[] args)
    {
        TimeBand.DoSomething();
    }
}


public class TimeBand
{
    public DayOfWeek DayName { get; set; }
    public int customerId { get; set; }

    public static void DoSomething()
    {
        var TimeBandList = new List<TimeBand>
            {
                new TimeBand()
                    {
                        DayName = DayOfWeek.Monday,
                        customerId = 10
                    },
                new TimeBand()
                    {
                        DayName = DayOfWeek.Tuesday,
                        customerId = 11
                    }
            };


            DateTime date = DateTime.Now;
            var timeBandRange = new List<TimeBand>();

            timeBandRange = TimeBandList.Where
                          (p => p.customerId == 1  
                             && p.DayName == date.DayOfWeek).ToList();
                }
            }

Issue with InMemory DB Entity Framework Core 6 - method not found

The solution was upgrading my entities package to .NET 6

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