bleis-tift https://blog.hatena.ne.jp/bleis-tift/ ぐるぐる～ https://bleis-tift.hatenablog.com/ VB.NET .NET Public Shared Function IsAlpha(ByVal str As String) As Boolean If IsNothing(str) Then Return False End If For Each ch As Char In str.ToCharArray If Not Char.IsLetter(ch) Then Return False End If Next Return True End Function 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fbleis-tift.hatenablog.com%2Fentry%2F20080111%2F1200039934" title="画面が青いよ！ - ぐるぐる～" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2008-01-11 17:25:34 rich https://bleis-tift.hatenablog.com/entry/20080111/1200039934 1.0 100%