# 列表验证

//Add a List validation to B column. Values should be in a list
var val = worksheet.DataValidations.AddListValidation("B:B");
//Shows error message when the input doesn't match the accepted values
val.ShowErrorMessage = true;
//Style of warning. "information" and "warning" allow users to ignore the validation,
//while "stop" and "undefined" doesn't
val.ErrorStyle = OfficeOpenXml.DataValidation.ExcelDataValidationWarningStyle.information;
//Title of the error mesage box
val.ErrorTitle = "This is the title";
//Message of the error
val.Error = "This is the message";
//Set to true to show a prompt when user clics on the cell
val.ShowInputMessage = true;
//Set the message for the prompt
val.Prompt = "This is a input message";
//Set the title for the prompt
val.PromptTitle = "This is the title from the input message";
//Define the accepted values
val.Formula.Values.Add("This is accepted");
val.Formula.Values.Add("This is also accepted");
val.Formula.Values.Add("Any other thing is rejected");
//Set to true if blank value is accepted
val.AllowBlank = false;

//Add a List validation to the C column
var val2 = worksheet.DataValidations.AddListValidation("C:C");
//Define the Cells with the accepted values
val2.Formula.ExcelFormula = "=$D$3:$D$5";
//Fill the cells with the accepted values
worksheet.Cells["D3"].Value = "Val1";
worksheet.Cells["D4"].Value = "Val2";
worksheet.Cells["D5"].Value = "Val3";