检查文本框内的文本 [英] Check the Text within textbox

问题描述

大家好，

Hi all,

How could we check the text at the time of entering the text in textbox, whether it is String or Int ?

推荐答案

当然总是 我>一个字符串.但是，您可以使用例如 Int32.TryParse > [ ^ ].

Of course it is always a string. However you may check if such string can be parsed to a number, using, for instance Int32.TryParse[^].

检查此

Hi ,
Check this

private void button1_Click(object sender, EventArgs e)
   {
       TryToParse(textBox1.Text);
   }
   void TryToParse(string value)
   {
       int number;
       bool result = Int32.TryParse(value, out number);
       if (result)
       {
           MessageBox.Show("Number");
       }
       else
       {
           MessageBox.Show("String");
       }
   }

最好的问候
M.Mitwalli

Best Regards
M.Mitwalli

尝试一下:-

Try This:-

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    if ((e.KeyChar >= ''a'' && e.KeyChar <= ''z'') || (e.KeyChar >= ''A'' && e.KeyChar <= ''Z''))
      {
           e.Handled = true;
           MessageBox.Show("Int Entered.", "TextBox Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
       }
    else
    {
        MessageBox.Show("String Entered.", "TextBox Message", MessageBoxButtons.OK,          
        MessageBoxIcon.Information);
    }
}

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