VB - 如何判斷輸入是否為數字 <!-- HTML generated using hilite.me --><div style="background: #000000; overflow:auto;width:auto;border:solid gray;border-width:.1em .1em .1em .8em;padding:.2em .6em;"><pre style="margin: 0; line-height: 125%"><span style="color: #ff0000">if</span> <span style="color: #ff0000">NOT</span> IsNumeric(TextBox1.Text) <span style="color: #ff0000">Then</span> MessageBox.Show (<span style="color: #87ceeb">"欄位輸入必須為數值"</span>) <span style="color: #ff0000">Exit</span> <span style="color: #ff0000">Sub</span> <span style="color: #ffff00">End</span> <span style="color: #ff0000">If</span> </pre></div>