How to use array parameter in c# using CLI function?

Question

I want to use array in C# using CLI function.

CLI Source

public value struct Test
{
    int         nIndex;
    TArrTest    Arr;    // TArrTest : Array struct
}

void Api::Set_Test(array<Test^>^% _Test2)

C# Source

Test[] Test3 = new Test[5];
test3[0].nIndex = 0;
...
...
Api.Set_Test(ref Test3) // Error message

Error Message: The parameter is not convert ref Test[] to ref system.Value[].

How can I call Set_Test in C#?

Knowing when to use the ^ hat is super-duper important in C++/CLI. Only use it for reference types (ref class or ref struct). The % is not correct either, the C++/CLI function doesn't create the array. Delete both. — Hans Passant
– Hans Passant, Commented May 2, 2019 at 13:03

Mark Benningfield · Accepted Answer · 2019-05-02 08:33:14Z

1

Your C++/CLI declaration:

void Api::Set_Test(array<Test^>^% _Test2)

is incorrect. The array is not an array of Test references, since Test is a value type. It should be

void Api::Set_Test(array<Test>^% _Test2)
                             ^------ remove the reference caret inside the angle brackets

answered May 2, 2019 at 8:33

Mark Benningfield

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