问题
In Excel, the DATE function for example shows "=number" against each field.
If I enter a string in these fields in place of a number, I get the #VALUE! error.
Can similar functionality be achieved with Excel-DNA?
回答1:
I don't think Excel supports a way to show those types for user-defined functions. Excel-DNA registers functions with the right types (like taking a Double). Excel completely controls how things are displayed in the Function Arguments dialog, and some aspects only work for built-in functions, like having mandatory parameters (displayed in bold).
来源：https://stackoverflow.com/questions/21585612/argument-type-validation-in-the-function-wizard