vb.net 获取汉字首字母的办法

建一个窗体，放两个文本框，一个输入汉字，一个显示拼音首字母，输入汉字的文本框TextChanged中调用getpy函数就行了

Public Class getchinesepyfirst

Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged

getpy()

End Sub

Function getpy()

Dim str As String

Dim i As Integer

str = TextBox1.Text.ToString

Dim ret As String

ret = ""

For i = 1 To Len(str)

ret = ret & getpychar(Mid(str, i, 1))

Next

TextBox2.Text = ret

Return 0 '看需求也可以改成Return ret

End Function

'获取汉字拼音第一字母

Function getpychar(ByVal as_char As String) As String

Dim tmp

tmp = 65536 + Asc(as_char)

If (tmp >= 45217 And tmp <= 45252) Then

getpychar = "A"

ElseIf (tmp >= 45253 And tmp <= 45760) Then

getpychar = "B"

ElseIf (tmp >= 45761 And tmp <= 46317) Then

getpychar = "C"

ElseIf (tmp >= 46318 And tmp <= 46825) Then

getpychar = "D"

ElseIf (tmp >= 46826 And tmp <= 47009) Then

getpychar = "E"

ElseIf (tmp >= 47010 And tmp <= 47296) Then

getpychar = "F"

ElseIf (tmp >= 47297 And tmp <= 47613) Then

getpychar = "G"

ElseIf (tmp >= 47614 And tmp <= 48118) Then

getpychar = "H"

ElseIf (tmp >= 48119 And tmp <= 49061) Then

getpychar = "J"

ElseIf (tmp >= 49062 And tmp <= 49323) Then

getpychar = "K"

ElseIf (tmp >= 49324 And tmp <= 49895) Then

getpychar = "L"

ElseIf (tmp >= 49896 And tmp <= 50370) Then

getpychar = "M"

ElseIf (tmp >= 50371 And tmp <= 50613) Then

getpychar = "N"

ElseIf (tmp >= 50614 And tmp <= 50621) Then

getpychar = "O"

ElseIf (tmp >= 50622 And tmp <= 50905) Then

getpychar = "P"

ElseIf (tmp >= 50906 And tmp <= 51386) Then

getpychar = "Q"

ElseIf (tmp >= 51387 And tmp <= 51445) Then

getpychar = "R"

ElseIf (tmp >= 51446 And tmp <= 52217) Then

getpychar = "S"

ElseIf (tmp >= 52218 And tmp <= 52697) Then

getpychar = "T"

ElseIf (tmp >= 52698 And tmp <= 52979) Then

getpychar = "W"

ElseIf (tmp >= 52980 And tmp <= 53688) Then

getpychar = "X"

ElseIf (tmp >= 53689 And tmp <= 54480) Then

getpychar = "Y"

ElseIf (tmp >= 54481 And tmp <= 62289) Then

getpychar = "Z"

Else '如果不是中文，则不处理

getpychar = as_char

End If

End Function

End Class