通过VB.NET中的字符串变量设置控件属性值

Question

I am very new to vb.net and the finding the terminology/concepts a little daunting at the moment, so forgive the newbieness of this question.

I'm wanting to set some control properties via variables. For instance:

Dim f As DateTimePicker
Dim g As String = "Short"
f.Format = DateTimePickerFormat.g

This doesn't work. What am I doing wrong and how can I correct it?

Answer 1

If you are trying to set it the system short format, you would just do it like this:

Dim f As New DateTimePicker
f.Format = DateTimePickerFormat.Short

Your idea was correct, but the Format property accepts an enumerated value which are predefined Enum values . Without going into reflection (which is a more advanced topic) you need to use a predefined value instead of trying to set it dynamically with a string value.

Edit

If you really want to use a string value to set the Format , you can do it this way:

Dim f As New DateTimePicker

' This must be set to a valid DateTimePickerFormat name.
Dim formatType As String = "Short"

f.Format = DirectCast([Enum].Parse(GetType(DateTimePickerFormat), formatType), DateTimePickerFormat)