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copied!<p>If you are looking to use C for a performance gain, most likely you are planning to do so through the use of pointers. C# does allow for use of pointers, using the unsafe keyword. Have you considered that?</p> <p>Also how will you be calling this code.. will it be called often (e.g. in a loop?) If so, marshalling the data back and forth may more than offset any performance gains.</p> <hr> <p><strong>Follow Up</strong></p> <p>Take a look at <a href="http://www.vsj.co.uk/dotnet/display.asp?id=174" rel="nofollow noreferrer">Native code without sacrificing .NET performance</a> for some interop options. There are ways to interop without too much of a performance loss, but those interops can only happen with the simplest of data types. </p> <p>Though I still think that you should investigate speeding up your code using straight .NET.</p> <hr> <p><strong>Follow Up 2</strong></p> <p>Also, may I suggest that if you have your heart set on mixing native code and managed code, that you create your library using c++/cli. Below is a simple example. Note that I am not a c++/cli guy, and this code doesn't do anything useful...its just meant to show how easily you can mix native and managed code.</p> <pre><code>#include "stdafx.h" using namespace System; System::Collections::Generic::List<int> ^MyAlgorithm(System::Collections::Generic::List<int> ^sourceList); int main(array<System::String ^> ^args) { System::Collections::Generic::List<int> ^intList = gcnew System::Collections::Generic::List<int>(); intList->Add(1); intList->Add(2); intList->Add(3); intList->Add(4); intList->Add(5); Console::WriteLine("Before Call"); for each(int i in intList) { Console::WriteLine(i); } System::Collections::Generic::List<int> ^modifiedList = MyAlgorithm(intList); Console::WriteLine("After Call"); for each(int i in modifiedList) { Console::WriteLine(i); } } System::Collections::Generic::List<int> ^MyAlgorithm(System::Collections::Generic::List<int> ^sourceList) { int* nativeInts = new int[sourceList->Count]; int nativeIntArraySize = sourceList->Count; //Managed to Native for(int i=0; i<sourceList->Count; i++) { nativeInts[i] = sourceList[i]; } //Do Something to native ints for(int i=0; i<nativeIntArraySize; i++) { nativeInts[i]++; } //Native to Managed System::Collections::Generic::List<int> ^returnList = gcnew System::Collections::Generic::List<int>(); for(int i=0; i<nativeIntArraySize; i++) { returnList->Add(nativeInts[i]); } return returnList; } </code></pre>

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