将JSON数组传递给MVC Controller Action无法正常工作

Question

我们希望将JSON array传递给MVC Controller Action。操作将卡列表作为参数。当我们调用Action时，参数为null。

这是客户端代码：

function PrintCards() {
    var CardsArray = [];
    CardsArray = GenerateArrayOfCards();
    //CardsArray has the desired data
    var errors = JsonResults('/Operator/PrintCards', 'Cards=' + CardsArray, 'Post');
    if (errors != '') {
        alert('Something went wrong!');
        return false;
    }
    alert('Cards got Successfully assigned.');
}

在服务器端，我们有以下Action

Public Function PrintCards(Cards As List(Of Card)) As JsonResult
    Try
        PrintAllCards(Cards)
        Return Json(String.Empty, "application/json", UTF8Encoding.UTF8)
    Catch ex As Exception
        Return Json(New With {.error = "Something went wrong!"}, "application/json", UTF8Encoding.UTF8)
    End Try
End Function

问题在于，在Action中，Cards为null，而在视图（客户端）中，数组具有数据。有没有转换或丢失的东西？