how to create instance from dll file and run its method?

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Hi,
I append some dll files to my program, and set these names as item to menustrip. I want when click on these items run dll automaticly. so, these dll files implement an interface dll!

C#

private void Form1_Load(object sender, EventArgs e) { foreach (var file in Directory.GetFiles(@"F:\tamrin\calcut\calcut\bin\Debug\plugin\", "*.dll")) { s = file.ToString(); var asm = Assembly.LoadFrom(file.ToString());
                foreach (var type in asm.GetTypes())
                {
                        AssemblyName asn = asm.GetName();
                        string[] b = asn.ToString().Split(',');
                        menu.Items.Add(b[0]);

// how to create instance from dll file and run its method?//
                    }
                }
            }

Posted 9-May-15 22:52pm

meliti

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Kornfeld Eliyahu Peter · Answer 1 · 2015-05-09T23:03:00

Solution 1

.NET framework (since 4) has a part that addresses extensiblity via interfaces - it called Managed Extensibility Framework[^]...
It enables you to define extension points (like menu) and load DLLs based on interfaces implemented by those DLLs...
I wrote an article about it that show the ides via a extensible web application: Extensible Web Application[^]

Posted 9-May-15 23:03pm

Kornfeld Eliyahu Peter

Comments

Sergey Alexandrovich Kryukov 10-May-15 11:54am

MEF is one of the approaches, my 5, but I think that in many cases, the plug-in architecture developed from scratch will give much simpler and very reliable solution which is easy to use. I explained it in Solution 3, please see.
—SA

Abhinav S · Answer 2 · 2015-05-09T23:13:00

Try

C#

Type t = asn.GetType(file.ToString() + "ClassName");  //Classname is class to be instantiated
var methodInfo = t.GetMethod("MyMethod", new Type[] { typeof(byte[]), typeof(int) });//myMethod is method to be instantiated
var o = Activator.CreateInstance(t);
var result = methodInfo.Invoke(o, params);//invoke the method

Once the assembly is loaded, load the class and then invoke the method.

Sergey Alexandrovich Kryukov · Answer 3 · 2015-05-10T05:52:00

Solution 3

Please see my past answers:
Access a custom object that resides in plug in dll[^],
Gathering types from assemblies by it's string representation[^],
C# Reflection InvokeMember on existing instance[^],
Dynamically Load User Controls[^].

—SA

Posted 10-May-15 5:52am

Sergey Alexandrovich Kryukov