I'm not sure what I'm missing here. I've got a button that when clicked, I'm using javascript to call a controller. This controller should create an excel file and return it to the user giving them the ability to download/save the file. I've tried a few different methods, but can't manage to get it to work. Here's my javascript side:
function exportList() {
var val = $("#team-dropdown").val();
const date = new Date().toISOString();
const param = {
"Date": date,
"GroupID": 1
}
$.ajax({
url: "#Url.Action("ExportToExcel", "Home")",
type: "POST",
data: param
});
}
Here's my server side:
public FileResult ExportToExcel(DateTime date, int groupID)
{
Load l = new Load();
List<Load> loadList = l.GetLoadsForGroup(date, groupID);
var fileDownloadName = "fileName.xlsx";
var contentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
ExcelPackage pck = new ExcelPackage();
var ws = pck.Workbook.Worksheets.Add("New workbook");
ws.View.ShowGridLines = true;
ws.DefaultColWidth = 25;
ws.Cells[1, 1].Value = "Order #";
var currRow = 2;
foreach (var load in loadList)
{
ws.Cells[2, 2].Value = load.LoadNumber;
}
var fs = new MemoryStream();
pck.SaveAs(fs);
fs.Position = 0;
var fsr = new FileStreamResult(fs, contentType);
fsr.FileDownloadName = fileDownloadName;
return (fsr);
}
Not sure what the best way to do this is. If there's a better way, please feel free to elaborate.
Your method looks fine. In that case you just need to use a html form to post instead of using the js function.
Alternatively, if you would like to use a ActionResult you can write:
public ActionResult ExportToExcel()
{
Load l = new Load();
List<Load> loadList = l.GetLoadsForGroup(date, groupID);
var fileDownloadName = "fileName.xlsx";
var contentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
ExcelPackage pck = new ExcelPackage();
var ws = pck.Workbook.Worksheets.Add("New workbook");
ws.View.ShowGridLines = true;
ws.DefaultColWidth = 25;
ws.Cells[1, 1].Value = "Order #";
var currRow = 2;
foreach (var load in loadList)
{
ws.Cells[2, 2].Value = load.LoadNumber;
}
Response.Clear();
Response.ContentType = contentType;
Response.AddHeader("content-disposition", "attachment; filename=\"" + fileDownloadName + "\"");
Response.BinaryWrite(pck.GetAsByteArray());
Response.Flush();
Response.End();
return View();
}
And you get the same result as your method.
Related
I am trying to upload large binary files from a web client to a .NET 4.6.1 Framework MVC API. These files could range anywhere from 5GB to 20GB.
I have tried splitting the file into chunks to upload each chunk and merge the results at the end, but the merged file is always corrupted. If I work with small files and don't split, the binary will work correctly. However, when I split and merge the file is "corrupted". It won't load or behave as expected.
I have looked all over and haven't seen a proper solution to this so i'm hoping someone can help me here.
I followed this https://forums.asp.net/t/1742612.aspx?How+to+upload+a+big+file+in+Mvc, but I can't get it to work and the corrected solution was never posted. I am keeping track of the order of files before merging on the server.
Javascript (Call to uploadData is made to initiate)
function uploadComplete(file) {
var formData = new FormData();
formData.append('fileName', file.name);
formData.append('completed', true);
var xhr3 = new XMLHttpRequest();
xhr3.open("POST", "api/CompleteUpload", true); //combine the chunks together
xhr3.send(formData);
return;
}
function uploadData(item) {
var blob = item.zipFile;
var BYTES_PER_CHUNK = 750000000; // sample chunk sizes.
var SIZE = blob.size;
//upload content
var start = 0;
var end = BYTES_PER_CHUNK;
var completed = 0;
var count = SIZE % BYTES_PER_CHUNK == 0 ? SIZE / BYTES_PER_CHUNK : Math.floor(SIZE / BYTES_PER_CHUNK) + 1;
while (start < SIZE) {
var chunk = blob.slice(start, end);
var xhr = new XMLHttpRequest();
xhr.onload = function () {
completed = completed + 1;
if (completed === count) {
uploadComplete(item.zipFile);
}
};
xhr.open("POST", "/api/MultiUpload", true);
xhr.setRequestHeader("contentType", false);
xhr.setRequestHeader("processData", false);
xhr.send(chunk);
start = end;
end = start + BYTES_PER_CHUNK;
}
}
Server Controller
//global vars
public static List<string> myList = new List<string>();
[HttpPost]
[Route("CompleteUpload")]
public string CompleteUpload()
{
var request = HttpContext.Current.Request;
//verify all parameters were defined
var form = request.Form;
string fileName;
bool completed;
if (!string.IsNullOrEmpty(request.Form["fileName"]) &&
!string.IsNullOrEmpty(request.Form["completed"]))
{
fileName = request.Form["fileName"];
completed = bool.Parse(request.Form["completed"]);
}
else
{
return "Invalid upload request";
}
if (completed)
{
string path = HttpContext.Current.Server.MapPath("~/Data/uploads/Tamp");
string newpath = Path.Combine(path, fileName);
string[] filePaths = Directory.GetFiles(path);
foreach (string item in myList)
{
MergeFiles(newpath, item);
}
}
//Remove all items from list after request is done
myList.Clear();
return "success";
}
private static void MergeFiles(string file1, string file2)
{
FileStream fs1 = null;
FileStream fs2 = null;
try
{
fs1 = System.IO.File.Open(file1, FileMode.Append);
fs2 = System.IO.File.Open(file2, FileMode.Open);
byte[] fs2Content = new byte[fs2.Length];
fs2.Read(fs2Content, 0, (int)fs2.Length);
fs1.Write(fs2Content, 0, (int)fs2.Length);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message + " : " + ex.StackTrace + " " + file2);
}
finally
{
if(fs1 != null) fs1.Close();
if (fs2 != null)
{
fs2.Close();
System.IO.File.Delete(file2);
}
}
}
[HttpPost]
[Route("MultiUpload")]
public string MultiUpload()
{
try
{
var request = HttpContext.Current.Request;
var chunks = request.InputStream;
string path = HttpContext.Current.Server.MapPath("~/Data/uploads/Tamp");
string fileName = Path.GetTempFileName();
string newpath = Path.Combine(path, fileName);
myList.Add(newpath);
using (System.IO.FileStream fs = System.IO.File.Create(newpath))
{
byte[] bytes = new byte[77570];
int bytesRead;
while ((bytesRead = request.InputStream.Read(bytes, 0, bytes.Length)) > 0)
{
fs.Write(bytes, 0, bytesRead);
}
}
return "test";
}
catch (Exception exception)
{
return exception.Message;
}
}
I am trying to download an excel file with large data set. On server side I am using EPPlus library to generate excel. I then pass the stream obj to client side. Client side code download the excel file using that stream obj.
When I open the downloaded file I get corrupt file error message. Where I am going wrong?
Server side code (C#)
public async Task<IActionResult> DownloadExcel(Model postData)
{
string apiUrl = "Api/URL/Get";
apiUrl += "?Status=" + postData.Status +
"&Gender=" + postData.Gender +
"&CurrentAge=" + postData.CurrentAge;
var result = await CallAPI.GetListFromApiAsync<ResultModel>(apiUrl);
var stream = new MemoryStream();
using (ExcelPackage excel = new ExcelPackage(stream))
{
var workSheet = excel.Workbook.Worksheets.Add("Sheet1");
// Column
workSheet.Cells[1, 1].Value = "Column 1";
workSheet.Cells[1, 2].Value = "Column 2";
.
.
.
workSheet.Cells[1, 19].Value = "Column 19";
// Row
int recordIndex = 2;
foreach (var d in result)
{
workSheet.Cells[recordIndex, 1].Value = d.data1;
workSheet.Cells[recordIndex, 2].Value = d.data2;
.
.
.
workSheet.Cells[recordIndex, 19].Value = d.data4;
recordIndex++;
}
for (int i = 1; i < 20; i++)
{
workSheet.Column(i).AutoFit();
}
string fileName = #"download.xlsx";
string fileType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
stream.Position = 0;
return File(stream, fileType, fileName);
}
}
Client side ajax call
$.ajax({
url: "/SomeURL/DownloadExcel",
type: "POST",
data: form.serialize(),
success: function (result) {
var binaryData = [];
binaryData.push(result);
var blob = new Blob([binaryData], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;' });
var link = document.createElement('a');
link.href = window.URL.createObjectURL(blob);
link.download = 'download.xlsx';
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}
});
This is my C# code to make Bitmap
public void VerificationCode(int captchaWidth = 75, int captchaHeight = 25)
{
var colorList = new List<Color> { Color.Red, Color.Orange, Color.Yellow, Color.Green, Color.Blue, Color.Brown };
Response.ContentType = "image/gif";
Response.Clear();
Response.BufferOutput = true;
var randString = new Random((int)DateTime.Now.Ticks).Next(99999).ToString("00000");
Session["VerificationCode"] = randString;
var bitmap = new Bitmap(captchaWidth, captchaHeight);
var graph = Graphics.FromImage(bitmap);
var font = new Font("Arial", 16, FontStyle.Italic);
var fontColor = Color.FromArgb(153, 153, 153);
graph.Clear(Color.White);
graph.DrawString(randString, font, new SolidBrush(fontColor), 0, 0);
var random = new Random((int)DateTime.Now.Ticks);
var randomColor = new Random((int)DateTime.Now.Ticks);
for (var i = 0; i < 100; i++)
{
var c = randomColor.Next(0, colorList.Count);
var randPixelX = random.Next(0, captchaWidth);
var randPixelY = random.Next(0, captchaHeight);
bitmap.SetPixel(randPixelX, randPixelY, colorList[c]);
}
bitmap.Save(Response.OutputStream, ImageFormat.Gif);
}
$('#ChangeCaptcha').on('click', function () {
$.ajax({
url: '#Url.Action("VerificationCode", "Base")',
type: 'Get',
async: false,
success: function (data) {
console.log(data);
$('#CaptchaImage').attr('src', "data:image/gif;base64," + data);
}
});
});
This is my Javascript code using ajax to get Bitmap to change img src.
But It's doesn't work.I alway get error message. Could any one can help me to fix this issue. I have used change minitype to "data:image/bmp;base64" or "data:image/gif," then I always get error.
You are serializing Bitmap to response stream. Your JS will receive a .net serialized object of type System.Byte[] and not a Base64 encoded string.
Save your bitmap to byte array through MemoryStream.ToArray()
Convert this array to Base64 string with Convert.ToBase64String(bitmapBytes)
Send resulting string to JS
I am trying to print a PDF file generated through reportViewer in my Web API, but the browser shows an error when tries to open the PDF file.
This is the code inside the controller in my Web API:
// ...generate candidatosDataSet
LocalReport relatorio = new LocalReport();
string rootPath = HttpRuntime.AppDomainAppPath;
relatorio.ReportPath = rootPath + #"\Reports\Report.rdlc";
relatorio.DataSources.Add(new ReportDataSource("Candidatos", candidatosDataSet));
relatorio.Refresh();
byte[] relatorioBytes = ExportUtils.GerarArquivoPDF(relatorio);
response = Request.CreateResponse(HttpStatusCode.OK, relatorioBytes);
response.Content.Headers.ContentDisposition = System.Net.Http.Headers.ContentDispositionHeaderValue.Parse("attachment; filename=relatorio.pdf");
response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/pdf");
This is how I am generating PDF File through reportViewer
public static byte[] GerarArquivoPDF(LocalReport relatorio)
{
String reportType = "PDF";
String mimeType;
String encoding;
String fileNameExtension;
String deviceInfo;
Warning[] warnings;
string[] streams;
byte[] renderedBytes;
deviceInfo = "<DeviceInfo>" + " <OutputFormat>" + reportType + "</OutputFormat>" + "</DeviceInfo>";
renderedBytes = relatorio.Render(
reportType,
deviceInfo,
out mimeType,
out encoding,
out fileNameExtension,
out streams,
out warnings);
return renderedBytes;
}
Here is my AngularJS service method:
function obterTermoConfirmacaoCandidatura(candidatoId) {
return $http.get(configValues.baseUrl + 'candidato/GetRelatorio',
{
params: { candidatoId: candidatoId },
responseType: 'arraybuffer'
});
}
And this is the code that I am using to print the file on the AngularJS controller:
function imprimirTermoConfirmacaoCandidatura(id) {
CandidatoAPIService.obterTermoConfirmacaoCandidatura(id)
.then(function (response) {
var contentType = response.headers('Content-Type') || "application/octet-stream";
var file = new Blob([response.data], {
type: contentType
});
var fileUrl = URL.createObjectURL(file);
var printWindow = $window.open(fileUrl);
printWindow.print();
}, function (error) {
alert(error.data);
});
}
The response from Web API was comming as string, with double quotes in beginning and in the end of the response, so the PDF File could not be rendered correctly. Also I converted the response from server to base64, by this method:
function b64toBlob(b64Data, contentType) {
var sliceSize = 512;
b64Data = b64Data.replace(/"/g, '');
b64Data = b64Data.replace(/^[^,]+,/, '');
b64Data = b64Data.replace(/\s/g, '');
var byteCharacters = window.atob(b64Data);
var byteArrays = [];
for (var offset = 0; offset < byteCharacters.length; offset += sliceSize) {
var slice = byteCharacters.slice(offset, offset + sliceSize);
var byteNumbers = new Array(slice.length);
for (var i = 0; i < slice.length; i++) {
byteNumbers[i] = slice.charCodeAt(i);
}
var byteArray = new Uint8Array(byteNumbers);
byteArrays.push(byteArray);
}
var blob = new Blob(byteArrays, { type: contentType });
return blob;
}
And changed the method on AngularJS controller to convert the response do base64:
function imprimirTermoAutorizacaoUsoImagem() {
CandidatoAPIService.obterTermoAutorizacaoUsoImagem()
.then(function (response) {
var contentType = response.headers('Content-Type') || "application/octet-stream";
var file = UtilsService.b64toBlob(response.data, "application/pdf");
var fileUrl = URL.createObjectURL(file);
var printWindow = $window.open(fileUrl);
printWindow.print();
}, function (error) {
alert(error.data);
});
}
And removed the responseType on the AngularJS service:
function obterTermoConfirmacaoCandidatura(candidatoId) {
return $http.get(configValues.baseUrl + 'candidato/GetObterTermoConfirmacaoCandidatura',
{
params: { candidatoId: candidatoId }
});
}
I need to call a c# function in my code behind using a javascript where i set two variables that i need to call my function with these variables, following my codes:
C# code behind:
public string CallWebMethod(string url, Dictionary<string, string> dicParameters)
{
try
{
byte[] requestData = this.CreateHttpRequestData(dicParameters);
HttpWebRequest httpRequest = (HttpWebRequest)HttpWebRequest.Create(url);
httpRequest.Method = "POST";
httpRequest.KeepAlive = false;
httpRequest.ContentType = "application/json; charset=utf-8";
httpRequest.ContentLength = requestData.Length;
httpRequest.Timeout = 30000;
HttpWebResponse httpResponse = null;
String response = String.Empty;
httpRequest.GetRequestStream().Write(requestData, 0, requestData.Length);
httpResponse = (HttpWebResponse)httpRequest.GetResponse();
Stream baseStream = httpResponse.GetResponseStream();
StreamReader responseStreamReader = new StreamReader(baseStream);
response = responseStreamReader.ReadToEnd();
responseStreamReader.Close();
return response;
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
private byte[] CreateHttpRequestData(Dictionary<string, string> dic)
{
StringBuilder sbParameters = new StringBuilder();
foreach (string param in dic.Keys)
{
sbParameters.Append(param);//key => parameter name
sbParameters.Append('=');
sbParameters.Append(dic[param]);//key value
sbParameters.Append('&');
}
sbParameters.Remove(sbParameters.Length - 1, 1);
UTF8Encoding encoding = new UTF8Encoding();
return encoding.GetBytes(sbParameters.ToString());
}
and this is my javascript :
<script>
function SendNeedHelpLinkTrace() {
var keysToSend = ['pCatchLinkVirement', 'pCatchLinkCarteBancaire', 'pCatchLinkRechargePaiementFactureTelecom', 'pCatchLinkPaiementVignetteImpotTaxe', 'pCatchLinkPaiementFactureEauElectricite', 'pCatchLinkServiceFatourati', 'pCatchLinkCihExpress', 'pCatchLinkEdocuments']
var lChannelId = document.getElementById('<%= HiddenChannelId.ClientID%>').value;
var lServiceId = "900149";
var lClientId = document.getElementById('<%= HiddenClientId.ClientID%>').value;
//alert(lClientId);
var lData = keysToSend.reduce(function(p,c){
var _t = sessionStorage.getItem(c);
return isEmpty(_t) ? p : p + ' | ' + _t;
}, '')
function isEmpty(val){
return val === undefined || val === null;
}
var lCollect;
console.log(lClientId);
console.log(lData);
alert(lData);
// this is the dictionnary:
lDataCollected = lClientId + ";" + lChannelId + ";" + lServiceId + ";" + lData;
console.log(lDataCollected);
//this is the url:
var url="http://10.5.230.21:4156/CatchEvent.asmx/CollectData";
sessionStorage.clear();
}
How should i proceed ?