使用EPPlus验证Excel（电子表格）文件
场景：有一个包含用户数据的Excel工作表。需要在插入（如果新）或更新（如果存在）数据库中的任何用户数据之前验证excel工作表。如果任何单元格的数据不正确或数据为空，则该单元格将以红色突出显示并带有注释以解释错误。
例如：电子邮件格式不正确
1 个答案:
答案 0 :(得分：1)
我考虑过将其发布为解决方案，以便对使用EPPlus验证excel表格有困难的任何人提供帮助。
EPPlus版本：4.5.2.1
以下是excel工作表结构。
以下是验证Excel工作表的完整代码。
[HttpPost]
public ActionResult BulkUserUpload(HttpPostedFileBase uploadFile)
{
string tempFileName = string.Empty;
string errorMessage = string.Empty;
if (uploadFile != null && uploadFile.ContentLength > 0)
{
//ExcelExtension contains array of excel extension types
if ( Config.ExcelExtension.Any(p => p.Trim() == Path.GetExtension(uploadFile.FileName)) )
{
//save the uploaded excel file to temp location
SaveExcelTemp(uploadFile, out tempFileName);
//validate the excel sheet
if (ValidateExcel(tempFileName, out errorMessage))
{
//save the data
SaveExcelDataToDatabase(tempFileName);
//spreadsheet is valid, show success message or any logic here
}
else
{
//set error message to shown in front end
ViewBag.ErrorMessage = errorMessage;
}
}
else
{
//excel sheet is not uploaded, show error message
}
}
else
{
//file is not uploaded, show error message
}
return View();
}
private bool ValidateExcel(string tempFileName, out string errorMessage)
{
bool result = true;
string error = string.Empty;
string filePath = GetTempFilePath(tempFileName);
FileInfo fileInfo = new FileInfo(filePath);
ExcelPackage excelPackage = new ExcelPackage(fileInfo);
ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.First();
int totalRows = worksheet.Dimension == null ? -1 : worksheet.Dimension.End.Row; //worksheet total rows
int totalCols = worksheet.Dimension == null ? -1 : worksheet.Dimension.End.Column; // total columns
//check spread sheet has rows (empty spreadsheet uploaded)
if (totalRows == -1)
{
result = false;
error = "Empty spread sheet uploaded.";
}
//check rows are more than or equal 2 (spread sheet has only header row)
else if (totalRows < 2)
{
result = false;
error = "Spread sheet does not contain any data";
}
//check total columns equal to headers defined (less columns)
else if (totalCols > 0 && totalCols != GetColumnHeaders().Count)
{
result = false;
error = "Spread sheet column header value mismatch.";
}
if (result)
{
//validate header columns
result &= ValidateColumns(worksheet, totalCols);
if (result)
{
//validate data rows, skip the header row (data rows start from 2)
result &= ValidateRows(worksheet, totalRows, totalCols);
}
if (!result)
{
error = "There are some errors in the uploaded file. Please correct them and upload again.";
}
}
errorMessage = error;
worksheet.Cells[worksheet.Dimension.Address].AutoFitColumns();
excelPackage.Save();
return result;
}
以下是验证方法
private bool SetError(ExcelRange cell, string errorComment)
{
var fill = cell.Style.Fill;
fill.PatternType = OfficeOpenXml.Style.ExcelFillStyle.Solid;
fill.BackgroundColor.SetColor(System.Drawing.Color.Red);
cell.AddComment(errorComment, "");
return false;
}
private bool ValidateHeaderColumns(ExcelWorksheet worksheet, int totlaColumns)
{
bool result = true;
List<string> listColumnHeaders = GetColumnHeaders();
for (int i = 1; i < totlaColumns; i++)
{
var cell = worksheet.Cells[1, i]; //header columns are in first row
if (cell.Value != null)
{
//column header has a value
if (!listColumnHeaders.Contains(cell.Value.ToString()))
{
result &= SetError(cell, "Invalid header. Please correct.");
}
}
else
{
//empty header
result &= SetError(cell, "Empty header. Remove the column.");
}
}
return result;
}
private bool ValidateRows(ExcelWorksheet worksheet, int totalRows, int totalCols)
{
bool result = true;
for (int i = 2; i <= totalRows; i++) //data rows start from 2`
{
for (int j = 1; j <= totalCols; j++)
{
var cell = worksheet.Cells[i, j];
switch (j)
{
//email address
case 1:
{
result &= ValidateEmailAddress(cell, "Email address");
break;
}
//first name
case 2:
{
result &= ValidateText(cell, "First name");
break;
}
//last name
case 3:
{
result &= ValidateText(cell, "Last name");
break;
}
//address line 1
case 4:
{
result &= ValidateText(cell, "Address line 1");
break;
}
//address line 2
case 5:
{
result &= ValidateText(cell, "Address line 2");
break;
}
//city
case 6:
{
result &= ValidateText(cell, "City");
break;
}
//telephone number
case 7:
{
result &= ValidateText(cell, "Telephone number");
break;
}
//mobile number
case 8:
{
result &= ValidateText(cell, "Mobile number");
break;
}
//job title
case 9:
{
result &= ValidateJobTitle(cell, "Job title");
break;
}
//salary
case 10:
{
result &= ValidateNumber(cell, "Salary");
break;
}
//role
case 11:
{
result &= ValidateRole(cell, "Role");
break;
}
//branch
case 12:
{
result &= ValidateBranch(cell, "Branch");
break;
}
//joined date
case 13:
{
result &= ValidateDate(cell, "Joined date");
break;
}
}
}
}
return result;
}
private bool ValidateEmailAddress(ExcelRange cell, string columnName)
{
bool result = true;
result = ValidateText(cell, columnName); //validate if empty or not
if (result)
{
if (!ValidateEmail(cell.Value.ToString())) //ValidateEmail => true, if email format is correct
{
result = SetError(cell, "Email address format is invalid.");
}
else if (cell.Value.ToString().Length > 150)
{
result = SetError(cell, "Email address too long. Max characters 150.");
}
}
return result;
}
private bool ValidateText(ExcelRange cell, string columnName)
{
bool result = true;
string error = string.Format("{0} is empty", columnName);
if (cell.Value != null)
{
//check if cell value has a value
if (string.IsNullOrWhiteSpace(cell.Value.ToString()))
{
result = SetError(cell, error);
}
}
else
{
result = SetError(cell, error);
}
return result;
}
private bool ValidateNumber(ExcelRange cell, string columnName)
{
bool result = true;
double value = 0.0;
string error = string.Format("{0} format is incorrect.", columnName);
result = ValidateText(cell, columnName);
if (result)
{
if (!double.TryParse(cell.Value.ToString(), out value))
{
result = SetError(cell, error);
}
}
return result;
}
private bool ValidateDate(ExcelRange cell, string columnName)
{
bool result = true;
DateTime date = DateTime.MinValue;
string error = string.Format("{0} format is incorrect.", columnName);
result = ValidateText(cell, columnName);
if (result)
{
if (!DateTime.TryParse(cell.Value.ToString(), out date))
{
result = SetError(cell, error);
}
}
return result;
}
private bool ValidateJobTitle(ExcelRange cell, string columnName)
{
bool result = true;
string error = "Job title does not exist.";
List<JobTitle> listJobTitle = JobTitle.GetJobTitles((int)JobTitle.JobTitleStatus.Active);
result = ValidateText(cell, columnName);
if (result)
{
if (!listJobTitle.Any(x => x.Name.ToLowerInvariant() == cell.Value.ToString().ToLowerInvariant()))
{
result = SetError(cell, error);
}
}
return result;
}
ValidateBranch（）和ValidateRole（）方法的实现与ValidateJobTitle（）方法相同。
以下是经过验证的带有错误的Excel工作表。
希望这对任何人都有帮助。
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