Using Reflection EWS API C#

Question

I'am trying to using EWS API in SSIS Script Task, but, the server doens't have the correspond dll: Microsoft.Exchange.WebServices.dll

So, the reflection is the only solution i found, the file of dll it's in the server and i can use.

I need to instantiate a subclass of an abstract class, but the compiler give this message error: Not found the constructor of Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo

I tried to use Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo, Microsoft.Exchange.WebServices.Data.SearchFilter.IsEqualTo and get nested type of SearchFilter, and none works

   Type typeSearchFilter = DLL2.GetType("Microsoft.Exchange.WebServices.Data.SearchFilter");


    var typeSearchFilterIsEqualTo = typeSearchFilter.GetNestedType("IsEqualTo");

    Type typeSearchFilterIsEqualTo0 = DLL2.GetType("Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo");

    Type typeSearchFilterIsEqualTo1 = DLL2.GetType("Microsoft.Exchange.WebServices.Data.SearchFilter.IsEqualTo");

    dynamic searcherFilter = Activator.CreateInstance(typeSearchFilterIsEqualTo, new object[] { folderSchemaDisplayName, folder})

I expected create a new instance of SearchFilter.IsEqualTo and pass the parameters to constructor and save the result in variable, like this

          dynamic searcherFilter = Activator.CreateInstance(typeSearchFilterIsEqualTo, new object[] { folderSchemaDisplayName, folder});

            var filter = searcherFilter;

Answer 1

I think your "typeSearchFilterIsEqualTo" parameter must be a reference to Microsoft.Exchange.WebServices.Data.FolderSchema.DisplayName, it is a public static field that is also in the DLL.

Here is a full example:

var DLL = Assembly.LoadFile(@"C:\Microsoft.Exchange.WebServices.dll");

var isEqualsTo = DLL.GetType("Microsoft.Exchange.WebServices.Data.SearchFilter+IsEqualTo");

var param1 = DLL.GetType("Microsoft.Exchange.WebServices.Data.FolderSchema").GetField("DisplayName").GetValue(null);
var param2 = "C:\\";

var instance1 = Activator.CreateInstance(isEqualsTo, new[] { param1, param2 });

// or...

var typeParam1 = DLL.GetType("Microsoft.Exchange.WebServices.Data.PropertyDefinitionBase");
var typeParam2 = typeof(object);

var ctor = isEqualsTo.GetConstructor(new[] { typeParam1, typeParam2 });

var instance2 = ctor.Invoke(new[] { param1, param2 });