IXlSheet.DataValidations Property
Provides access to the collection of data validation rules specified in a worksheet.
Namespace: DevExpress.Export.Xl
Assembly: DevExpress.Printing.v24.2.Core.dll
Declaration
Property Value
| Type | Description |
|---|---|
| IList<XlDataValidation> | A collection of XlDataValidation objects that specify data validation rules applied to cell ranges. |
Remarks
Data validation allows you to impose restrictions on cells to prevent other users from entering incorrect values in validated cells. For example, you can create a drop-down list of allowed values, restrict the number of characters entered into a cell, restrict data entry to a number within limits, display an error message, provide an input message explaining what values can be entered into cells, etc.
An XlDataValidation class instance provides information describing the data validation rule: the XlDataValidation.Ranges property enables you to specify cell ranges for which the rule is in effect, while XlDataValidation.Type, XlDataValidation.Criteria1, XlDataValidation.Criteria2, XlDataValidation.Operator and other properties can be used to specify the validation criteria.
All data validation rules in a worksheet are contained in a collection which can be accessed using the DataValidations property. To add a new data validation rule, use the collection’s Add method.
The following example demonstrates how to apply data validation of different types to worksheet cells to prevent end-users from entering invalid values.
Note
A complete sample project is available at https://github.com/DevExpress-Examples/excel-export-api-examples
// Apply data validation to cells.
// Restrict data entry in the range A2:A5 to a 5-digit number.
XlDataValidation validation = new XlDataValidation();
validation.Ranges.Add(XlCellRange.FromLTRB(0, 1, 0, 4));
validation.Type = XlDataValidationType.Custom;
validation.Criteria1 = "=AND(ISNUMBER(A2),LEN(A2)=5)";
// Add the specified rule to the worksheet collection of data validation rules.
sheet.DataValidations.Add(validation);
// Restrict data entry in the cell range C2:C5 to a whole number between 600 and 2000.
validation = new XlDataValidation();
validation.Ranges.Add(XlCellRange.FromLTRB(2, 1, 2, 4));
validation.Type = XlDataValidationType.Whole;
validation.Operator = XlDataValidationOperator.Between;
validation.Criteria1 = 600;
validation.Criteria2 = 2000;
// Display the error message.
validation.ErrorMessage = "The salary amount must be between 600$ and 2000$.";
validation.ErrorTitle = "Warning";
validation.ErrorStyle = XlDataValidationErrorStyle.Warning;
validation.ShowErrorMessage = true;
// Display the input message.
validation.InputPrompt = "Please enter a whole number between 600 and 2000";
validation.PromptTitle = "Salary";
validation.ShowInputMessage = true;
// Add the specified rule to the worksheet collection of data validation rules.
sheet.DataValidations.Add(validation);
// Restrict data entry in the cell range D2:D5 to a decimal number within the specified limits.
// Bonus cannot be greater than 10% of the salary.
validation = new XlDataValidation();
validation.Ranges.Add(XlCellRange.FromLTRB(3, 1, 3, 4));
validation.Type = XlDataValidationType.Decimal;
validation.Operator = XlDataValidationOperator.Between;
validation.Criteria1 = 0;
// Use a formula to specify the validation criterion.
validation.Criteria2 = "=C2*0.1";
// Display the error message.
validation.ErrorMessage = "Bonus cannot be greater than 10% of the salary.";
validation.ErrorTitle = "Information";
validation.ErrorStyle = XlDataValidationErrorStyle.Information;
validation.ShowErrorMessage = true;
// Add the specified rule to the worksheet collection of data validation rules.
sheet.DataValidations.Add(validation);
// Restrict data entry in the cell range E2:E5 to values in a drop-down list obtained from the cells G2:G5.
validation = new XlDataValidation();
validation.Ranges.Add(XlCellRange.FromLTRB(4, 1, 4, 4));
validation.Type = XlDataValidationType.List;
validation.ListRange = XlCellRange.FromLTRB(6, 1, 6, 4).AsAbsolute();
// Add the specified rule to the worksheet collection of data validation rules.
sheet.DataValidations.Add(validation);