C# WinForm TextBox 只能输入数字【正则替换】

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private void txtMaxCount_TextChanged(object sender, EventArgs e) {     //替换非数字     this.txtMaxCount.Text = Regex.Replace(this.txtMaxCount.Text, @"[^\d]*", "");     // 将光标定位到文本框的最后     this.txtMaxCount.SelectionStart = this.txtMaxCount.Text.Length; }