Data Validation
- 5 minutes to read
This document introduces the Data Validation concept and demonstrates how use the Data Validation API to manage data validation rules in a worksheet.
Data Validation Overview
Data validation ensures that a cell only accepts valid data. When users enter invalid data, a message can be displayed that explains why the value is invalid and/or how to correct the error.
The SpreadsheetControl provides the Data Tools command group located on the Data Ribbon tab, to invoke a Data Validation dialog and to identify cells with invalid data by displaying a red circle around them.
When a user attempts to enter a value that is not correct according to validation rules, an alert is shown. Alert text is specified with the XtraSpreadsheetStringId.Msg_DataValidationFailed enumeration member so it can be easily localized, as described in the Localization topic.
You can also provide a custom message that explains what data can be entered in a cell, and a custom error dialog that appears when incorrect data is entered.
Data Validation API
The DataValidation interface provides information describing the data validation rule - the DataValidation.Range in which the rule is in effect, the DataValidation.ValidationType and other options which can be used while validating data.
Data validation rules in a worksheet are contained in the DataValidationCollection collection which is accessible via the Worksheet.DataValidations property.
To add a new data validation rule, use the DataValidationCollection.Add method of the collection. To cancel a particular rule, remove it from the collection. To remove all data validation rules, clear the collection.
Use the DataValidationCollection.GetDataValidation method to retrieve data validation rules for the specified cell. The DataValidationCollection.GetDataValidations method obtains data validation entries for cells in the specified range or that meet certain criteria.
Data Validation Common Tasks
Task | API Members | User Interface |
|---|---|---|
Restrict data to predefined items in a list. |
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Restrict numbers outside a specified range. |
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Restrict dates and times outside a certain time frame. |
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Limit the number of text characters. |
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Validate data based on formulas or values in other cells. |
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Create a message that explains what data can be entered in a cell. |
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Create a message that appears when the end-user types incorrect data. |
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Display or hide circles around invalid data. The SpreadsheetControl circles only first 255 invalid cells, other invalid entries are ignored. |
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Check whether the cell contains valid data. | ||
Retrieve cells that do not meet the data validation criteria. |
The code snippet below illustrates how to use Data Validation API to create and apply different validation criteria to worksheet cells.
workbook.LoadDocument("Documents\\DataValidation.xlsx");
Worksheet worksheet = workbook.Worksheets[0];
worksheet["C1"].SetValue(DateTime.Now);
worksheet["C1"].NumberFormat = "mmm/d/yyyy h:mm";
// Restrict data entry to a whole number from 10 to 20.
worksheet.DataValidations.Add(worksheet["B1"], DataValidationType.WholeNumber, DataValidationOperator.Between, 10, 20);
// Restrict data entry to a number within limits.
DataValidation validation = worksheet.DataValidations.Add(worksheet["F4:F11"], DataValidationType.Decimal, DataValidationOperator.Between, 10, 40);
// Restrict data entry using criteria calculated by a worksheet formula.
worksheet.DataValidations.Add(worksheet["B4:B11"], DataValidationType.Custom, "=AND(ISNUMBER(B4),LEN(B4)=5)");
// Restrict data entry to 3 symbols.
worksheet.DataValidations.Add(worksheet["D4:D11"], DataValidationType.TextLength, DataValidationOperator.Equal, 3);
// Restrict data entry to values in a drop-down list specified in code.
// Note that the list in code should always use comma to separate entries,
// but the list in UI is displayed using culture-specific list separator.
worksheet.DataValidations.Add(worksheet["A4:A11"], DataValidationType.List, "PASS, FAIL");
// Restrict data entry to values in a drop-down list obtained from a worksheet.
worksheet.DataValidations.Add(worksheet["E4:E11"], DataValidationType.List, ValueObject.FromRange(worksheet["H4:H9"].GetRangeWithAbsoluteReference()));
// Restrict data entry to a time before the specified time.
worksheet.DataValidations.Add(worksheet["C1"], DataValidationType.Time, DataValidationOperator.LessThanOrEqual, DateTime.Now);
// Highlight data validation ranges.
worksheet["H4:H9"].FillColor = Color.LightGray;
int[] MyColorScheme = new int[] { 0xFFC4C4, 0xFFD9D9, 0xFFF6F6, 0xFFECEC, 0xE9D3D3, 0xFFDFC4, 0xFFDAE9};
for (int i = 0; i < worksheet.DataValidations.Count; i++){
worksheet.DataValidations[i].Range.FillColor = Color.FromArgb(MyColorScheme[i]);
}