You can see an article about how to build .net assembly on MATLAB. Here we involve two matlab types, MWArray and MWNumericArray.

Suppose

• matlab ne project name : projname
• class name : classname
• function name : func，with an argument : 2D matrix and output also is 2D matrix
• input array : 2D array in C#, name is myarray

using projname;

classname myclass = new classname();

MWArray results = myclass.func((MWNumericArray)myarray);

double[,] resultArr = (double[,])results.ToArray();

Hope those can help you all.

By the way, you can use "arrname(:)" to convert n-D matrix to n by 1 matrix in matlab