interop

I have an AddIn which I want to invoke through Excel interop from a C# winforms application. I can't get the addin etc. to load unless I uninstall and resinstall it each time (this is apparantly something to do with Excel not loading addins when you use interop - btw, can't get their example to work in C#). Unfortunately this is slow and annoying to the user so I need to streamline it. I want to have one instance of Excel but load an already installed addin without forcing this install/reinstall problem. I've searched and searched but everything I find on google gives the solution to install

I'm currently working on a library that's to be exposed to COM for use in a legacy project that's being upgraded. I'm creating interfaces that are to be exposed, and they have properties on them with long, int, etc types. Using the DescriptionAttribute, I can get helpstrings generated in the .tlb for interfaces, classes, and methods, but for some reason it doesn't seem to want to work for properties. Is there anyway to get a helpstring generated in the TLB output for properties ? You have to put the attribute on the getter and setter individually. Like this: using System; using System

On the MSDN I've found the following description for the two attributes: PreserveSig Set the PreserveSig field to true to directly translate unmanaged signatures with HRESULT or retval values; set it to false to automatically convert HRESULT or retval values to exceptions. By default, the PreserveSig field is true. SetLastError Enables the caller to use the Marshal.GetLastWin32Error API function to determine whether an error occurred while executing the method. In Visual Basic, the default is true (which adds some overhead); in C# and C++, the default is false. My question is: How these two

I am rather perplexed by this. If we take the method cellForRowAtIndexPath: in UITableView for example, it's method signature is: func cellForRowAtIndexPath(_ indexPath: NSIndexPath!) -> UITableViewCell! And its return value is: An object representing a cell of the table or nil if the cell is not visible or indexPath is out of range. That sounds like the perfect reason to use a standard optional. In fact, since all pointer based types in Objective-C can be nil... it seems to make sense that all Objective-C pointer types should be imported as standard optionals. I know from the WWDC talk that

Basically what I need to do is this FileChannel.MapMode.READ_ONLY I tried doing the obvious (.. FileChannel MapMode READ_ONLY) but that ends up throwing an exception java.lang.NoSuchFieldException: MapMode even the / notation specified as for access static fields in the interop documentation produces the same exception (. (FileChannel/MapMode) READ_ONLY) You access inner classes with $ java.nio.channels.FileChannel$MapMode/READ_ONLY Martin Valjavec The syntax (FileChannel/MapMode) is a simplification and intended only for static fields and methods (for fields, you may even omit the parentheses

I am using Ms Office Interop assemblies to create a MS Project file. To save the file created, I am using FileSaveAs method and it prompts a message saying that if you want to replace the existing file. I want to suppress the message, and I didn't find any parameter in FileSaveAs method for this purpose. Any Idea on this? I'am using C# as my programming language. dotNetkow I ran into this issue when working with Excel Interop. The best I've been able to find is to disable all Office alerts, like this: Microsoft.Office.Interop.MSProject.Application msProjectApp = new Microsoft.Office.Interop