Dev report 计算列

CalculatedField calcField = new CalculatedField();
            this.CalculatedFields.Add(calcField);

            // Define its properties.
            calcField.DataSource = this.DataSource;
            calcField.DataMember = this.DataMember;
            calcField.FieldType = FieldType.Decimal;
            calcField.DisplayName = "A Calculated Field";
            calcField.Name = "myField";
            calcField.Expression = "[TotalShopCost] * 0.1";

            // Bind a label's Text property to the calculated field.
            this.FindControl("txtSum", true).DataBindings.Add("Text", null, "myField");