ArcGISRuntime.Samples.Desktop.Pages.FilterFeatureLayer.GetFilterTest C# (CSharp) Method

        private string GetFilterTest()
        {
            if (string.IsNullOrEmpty(pNumTextBox.Text))
            {
                return "1=1";
            }

            int pNum;
            if (int.TryParse(pNumTextBox.Text, out pNum))
            {
                return "SUM_P_NUM >= " + pNumTextBox.Text;
            }
            else
            {
                pNumTextBox.Text = string.Empty;
                MessageBox.Show("不正な入力値です");
                return "1=1";
            }
        }
    }