Question

C# TextBox中只能输入数字的几种常用方法(C#)

Answer 1

if (e.KeyChar > 0x20){try{double.Parse(((TextBox)sender).Text + e.KeyChar.ToString());}catch{ e.KeyChar = (char)0; //处理非法字符}}}private void TextBox_KeyPress(object sender, KeyPressEventArgs e){if(e.KeyChar!=8&&!Char.IsDigit(e.KeyChar)){ e.Handled = true;}}或者private void TextBox_KeyPress(object sender, KeyPressEventArgs e){if(e.KeyChar!='\b'&&!Char.IsDigit(e.KeyChar)){ e.Handled = true;}}private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e){if(e.KeyChar!='\b')//这是允许输入退格键{if((e.KeyChar<'0')||(e.KeyChar>'9'))//这是允许输入0-9数字{ e.Handled = true;}}}private void button1_Click(object sender, EventArgs e){string text = this.textBox1.Text; if (text != null) MessageBox.Show(text);}private void textBox1_Validating(object sender, CancelEventArgs e){const string pattern = @"^\d+\.?\d+$";