using System.Text .RegularExpressions;
private void txtChequeCode_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) { if(e.KeyCode == Keys.Enter ) { if(Regex.Match (this.txtChequeCode .Text .Trim (),@"^\d+$").Success ) { this.txtChequeSum .Focus (); this.txtChequeSum .Select (); } else { MessageBox.Show ("输入无效!,只允许输入数字"); } } }
private void txtChequeSum_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) { if(e.KeyCode == Keys.Enter ) { if(Regex.Match (this.txtChequeSum .Text .Trim (),@"^\d+$").Success ) { this.ButtonSave .Focus (); this.ButtonSave .Select (); } else { MessageBox.Show ("输入无效!,只允许输入数字"); } } } 
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