请问VB.NET 中如何判断一个字符是全角还是半角?

有没有哪个类有现成的方法??
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Dim s As String = Me.TextBox1.Text.Trim
Dim count As Integer = System.Text.UnicodeEncoding.Unicode.GetByteCount(s)

MessageBox.Show(count.ToString)
如果count=1就是半角,为2就是全角!

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