[VB.NET] 常用VB.NET字串處理

當字串長度是固定的時候，取出時可指定位置，Substring是由0開始

Sample:
Dim stringReader As String = "ABCDEFG"
Dim StrtNO As String = stringReader.Substring(2, 3)

Result:
StrtNO ="CDE"



當字串長度是不固定時，從右側取出指定位數
Sample:
Dim stringReader As String = "ABCDEFG"
Dim StrtNO As String = stringReader.Substring(stringReader .Length - 3)

Result:
StrtNO = "EFG"