In the original language design, there was no explicit support for the param array that C# supports. Instead, one flags an ordinary array with an attribute, as follows:

void Trace1( String* format, [ParamArray]Object* args[] );

void Trace2( String* format, Object* args[] );

While these both look the same, the ParamArray attribute tags this for C# or other .NET languages as an array taking a variable number of elements with each invocation. In C++/CLI, the design for directly supporting this looked as follows:

void Trace1( String^ format, ... array<Object^>^ args );

void Trace2( String^ format, array<Object^>^ args );

in which the ellipsis […] preceding the array declaration tags it as a param array. Unfortunately, this has recently failed to make the list of features to be implemented for the inaugural release of C++/CLI. However, I can’t bear to [at least as yet] remove it from the translation tool. 

看来问题在于自己看的文档是草案啊，手头的编译器可能还没能实现所有！！！