I have a situation where I am getting an image as httppostedfilebase type in my MVC code. I have a corresponding Image type column in my SQL db.
I need to know how do I convert/Save this httppostedfilebase type as image in my DB.
Create a function to convert HttpPostedFileBase object to file
public byte[] ConvertToByte(HttpPostedFileBase file)
{
byte[] imageByte = null;
BinaryReader rdr = new BinaryReader(file.InputStream);
imageByte = rdr.ReadBytes((int)file.ContentLength);
return imageByte;
}
Code like this in Your Controller
public ActionResult Create(AdminDetailsViewModel viewmodel)
{
if (ModelState.IsValid)
{
HttpPostedFileBase file = Request.Files["ImageData"];
viewmodel.Image = ConvertToByte(file);
db.YourDbContextSet.Add(viewmodel);
db.SaveChanges();
}
}
Hope this will help
Related
I am trying to do an export to excel button when it gets hit I want to call this api and download an excel sheet.
my controller code looks like this and I am honestly stuck because I am unsure what I should be returning back. I am new to .net core api sorry
[Route("api/excel")]
public class ExportToExcel : Controller
{
private readonly ScadaContext _context;
public ExportToExcel(ScadaContext context)
{
_context = context;
}
// GET: api/values
[HttpGet]
public ActionResult GetExcelMainView()
{
var query = _context.Main_View.Where(x => !x.MeterId.StartsWith("HOGC"));
List<Object[]> MainViewList = new List<Object[]>();
foreach(var p in query)
{
MainViewList.Add(new Object[] { "Battery Voltage", p.BatteryVoltage });
}
MemoryStream stream = new MemoryStream();
using (ExcelPackage pck = new ExcelPackage(stream))
{
ExcelWorksheet ws = pck.Workbook.Worksheets.Add("MainView");
ws.Cells["A1"].LoadFromArrays(MainViewList);
Response.Clear();
Response.Headers.Add("content-disposition", "attachment; filename=Clients.xlsx");
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
var bytes = pck.GetAsByteArray();
Response.Body.WriteAsync(bytes, 0, bytes.Length);
}
}
}
Your simplest way to use one of the FileResult subclassess,
such as FileStreamResult
The controller method File(stream,...,...) does it for you:
return File(stream, contentTypeString, willbeSavedWithThisFileName);
should just work. I'm not sure if you'll have to re-"wrap" your package in a memorystream again
var streamagain = new MemoryStream(package.GetAsByteArray());
(with the "handrolled" code you've already written, I'd try return StatusCode(200) as the way to get your Content back to the client).
in UWP there are files and permissions restrictions, so we can only acces files directly from few folders or we can use filepicker to access from anywhere on system.
how can I use the files picked from filepicker and use them anytime again when the app runs ? tried to use them again by path but it gives permission error. I know about the "futureacceslist" but its limit is 1000 and also it will make the app slow if I am not wrong? .
Is there a better way to do this ? or can we store storage files link somehow in local sqlite database?
If you need to access lots of files, asking the user to select the parent folder and then storing that is probably a better solution (unless you want to store 1,000 individually-picked files from different locations). You can store StorageFolders in the access list as well.
I'm not sure why you think it will make your app slow, but the only real way to know if this will affect your performance is to try it and measure against your goals.
Considering this method..
public async static Task<byte[]> ToByteArray(this StorageFile file)
{
byte[] fileBytes = null;
using (IRandomAccessStreamWithContentType stream = await file.OpenReadAsync())
{
fileBytes = new byte[stream.Size];
using (DataReader reader = new DataReader(stream))
{
await reader.LoadAsync((uint)stream.Size);
reader.ReadBytes(fileBytes);
}
}
return fileBytes;
}
This class..
public class AppFile
{
public string FileName { get; set; }
public byte[] ByteArray { get; set; }
}
And this variable
List<AppFile> _appFiles = new List<AppFile>();
Just..
var fileOpenPicker = new FileOpenPicker();
IReadOnlyList<StorageFile> files = await fileOpenPicker.PickMultipleFilesAsync();
foreach (var file in files)
{
var byteArray = await file.ToByteArray();
_appFiles.Add(new AppFile { FileName = file.DisplayName, ByteArray = byteArray });
}
UPDATE
using Newtonsoft.Json;
using System.Linq;
using Windows.Security.Credentials;
using Windows.Storage;
namespace Your.Namespace
{
public class StateService
{
public void SaveState<T>(string key, T value)
{
var localSettings = ApplicationData.Current.LocalSettings;
localSettings.Values[key] = JsonConvert.SerializeObject(value);
}
public T LoadState<T>(string key)
{
var localSettings = ApplicationData.Current.LocalSettings;
if (localSettings.Values.ContainsKey(key))
return JsonConvert.DeserializeObject<T>(((string) localSettings.Values[key]));
return default(T);
}
public void RemoveState(string key)
{
var localSettings = ApplicationData.Current.LocalSettings;
if (localSettings.Values.ContainsKey(key))
localSettings.Values.Remove((key));
}
public void Clear()
{
ApplicationData.Current.LocalSettings.Values.Clear();
}
}
}
A bit late, but, yes the future access list will slow down your app in that it returns storagfile, storagefolder, or storeageitem objects. These run via the runtime broker which hits a huge performance barrier at about 400 objects regardless of the host capability
We're making an ASP.Net MVC app that needs to be able to generate a PDF and display it to the screen or save it somewhere easy for the user to access. We're using PdfSharp to generate the document. Once it's finished, how do we let the user save the document or open it up in a reader? I'm especially confused because the PDF is generated server-side but we want it to show up client-side.
Here is the MVC controller to create the report that we have written so far:
public class ReportController : ApiController
{
private static readonly string filename = "report.pdf";
[HttpGet]
public void GenerateReport()
{
ReportPdfInput input = new ReportPdfInput()
{
//Empty for now
};
var manager = new ReportPdfManagerFactory().GetReportPdfManager();
var documentRenderer = manager.GenerateReport(input);
documentRenderer.PdfDocument.Save(filename); //Returns a PdfDocumentRenderer
Process.Start(filename);
}
}
When this runs, I get an UnauthorizedAccessException at documentRenderer.PdfDocument.Save(filename); that says, Access to the path 'C:\Program Files (x86)\Common Files\Microsoft Shared\DevServer\10.0\report.pdf' is denied. I'm also not sure what will happen when the line Process.Start(filename); is executed.
This is the code in manager.GenerateReport(input):
public class ReportPdfManager : IReportPdfManager
{
public PdfDocumentRenderer GenerateReport(ReportPdfInput input)
{
var document = CreateDocument(input);
var renderer = new PdfDocumentRenderer(true, PdfSharp.Pdf.PdfFontEmbedding.Always);
renderer.Document = document;
renderer.RenderDocument();
return renderer;
}
private Document CreateDocument(ReportPdfInput input)
{
//Put content into the document
}
}
Using Yarx's suggestion and PDFsharp Team's tutorial, this is the code we ended up with:
Controller:
[HttpGet]
public ActionResult GenerateReport(ReportPdfInput input)
{
using (MemoryStream stream = new MemoryStream())
{
var manager = new ReportPdfManagerFactory().GetReportPdfManager();
var document = manager.GenerateReport(input);
document.Save(stream, false);
return File(stream.ToArray(), "application/pdf");
}
}
ReportPdfManager:
public PdfDocument GenerateReport(ReportPdfInput input)
{
var document = CreateDocument(input);
var renderer = new PdfDocumentRenderer(true,
PdfSharp.Pdf.PdfFontEmbedding.Always);
renderer.Document = document;
renderer.RenderDocument();
return renderer.PdfDocument;
}
private Document CreateDocument(ReportPdfInput input)
{
//Creates a Document and puts content into it
}
I'm not familar with PDF sharp but for MVC is mostly done via built in functionality. You need to get your pdf document represented as an array of bytes. Then you'd simply use MVC's File method to return it to the browser and let it handle the download. Are there any methods on their class to do that?
public class PdfDocumentController : Controller
{
public ActionResult GenerateReport(ReportPdfInput input)
{
//Get document as byte[]
byte[] documentData;
return File(documentData, "application/pdf");
}
}
I've put together a function that creates a sharepoint folder in a document library based on the url that's past in as an argument. The code works and the folder shows up in sharepoint from the webapplication.
However, when I query the SPWeb object for the folder afterward, it says the folder doesnt exist. Which makes no sense to me. Stranger still, is that this very same code worked no too long ago. I had been using it to create tree structures in sharepoint.
Even if the query folder fails, the GetFolder still returns a the folder, but when I add files to the returned folder, I get a runtime exception indicating that the file doesn't exist...which I assume means the folder I am trying to add it to doesn't exist since the file I am adding, doesn't exist yet. Which is why I am adding it.
So my question is, why am I getting this error, and why does FolderExists return false when the folder actually exists? We know it exists because GetFolder actually returns it...
I've included some actual code from the app to make things clear.
If someone could have a look at the code and see and anything jumps out at them, that would be fantabulous...Thanks
Code to build folders:
public void CreateFolder(SPUriBuilder url)
{
try
{
Log.Instance.WriteToLog("CreateFolder({0})", url);
var library = GetLibrary(url.Library);
if (library != null)
{
// parse out string data
//
var parent = library.RootFolder.ServerRelativeUrl;
var segments = url.Account.Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
var path = parent;
// get default folder collection
//
SPFolderCollection subFolders = _web.GetFolder(parent).SubFolders;
// check for sub-folders to create
//
if (segments.Length > 0)
{
int i = 0;
do
{
// check for folder and create if non-existant
//
var buildPath = String.Format("{0}/{1}", path, segments[i]);
if (_web.GetFolder(buildPath).Exists == false)
_web.GetFolder(path).SubFolders.Add(segments[i]);
// retrieve new sub-folder collection
//
subFolders = _web.GetFolder(buildPath).SubFolders;
path = buildPath;
// next folder in path
//
i++;
}
while (i < segments.Length);
}
// finally, add folder of interest
//
subFolders.Add(url.Folder);
}
}
catch (Exception e)
{
throw new SPImportException("Exception: {0}, creating folder: {1} in Library: {2}", e.Message, url.Folder, url.Library);
}
}
Code to Query folder:
public bool FolderExists(SPUriBuilder url)
{
return _web.GetFolder(url.Uri.LocalPath).Exists;
}
Code to Get Folder:
private SPFolder GetFolder(SPUriBuilder url)
{
return _web.GetFolder(url.Uri.LocalPath);
}
The SPUriBuilder is a custom class I created to assemble the Uri:
public class SPUriBuilder
{
public string SiteUrl { get; private set; }
public string Library { get; private set; }
public string Parent { get; private set; }
public string Folder { get; private set; }
public string File { get; private set; }
public string Account { get; private set; }
public Uri Uri { get; private set; }
public SPUriBuilder(string siteUrl, string library, string account, string parent, string folder)
{
this.SiteUrl = siteUrl;
this.Library = library;
this.Account = account;
this.Parent = parent.Replace("\\", "/");
this.Parent = this.Parent.StartsWith("/") ? this.Parent.Substring(1) : this.Parent;
this.Folder = folder;
StringBuilder url = new StringBuilder();
url.AppendFormat("{0}/{1}/{2}", SiteUrl, Library, Account);
if (String.IsNullOrEmpty(Parent) == false)
url.AppendFormat("/{0}", Parent);
url.AppendFormat("/{0}", Folder);
this.Uri = new Uri(url.ToString());
}
public SPUriBuilder(SPUriBuilder uri, string file)
: this(uri.SiteUrl, uri.Library, uri.Account, uri.Parent, uri.Folder)
{
this.File = file;
StringBuilder url = new StringBuilder();
url.AppendFormat("{0}/{1}", this.Uri.ToString(), this.File);
this.Uri = new Uri(url.ToString());
}
public override string ToString()
{
return Uri.ToString();
}
}
I found the answer this to this myself. The problem was in the code used to create the folder.
var parent = library.RootFolder.ServerRelativeUrl;
// This line of code is incorrect, so it returned the wrong data, thus building the folder path incorrectly.
//
var segments = url.Account.Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
var path = parent;
// This is the replacement line of code that fixed the issue.
//
var segments = url.Uri.LocalPath.Substring(parent.Length+1).Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
// as well, this line had to be removed since it was no longer needed
//
// finally, add folder of interest
//
subFolders.Add(url.Folder);
Ultimately the issue turned out be that the folder structure did not exist that I was attempting to create the file in. One or more segments in the path were missing.
So if you ever see this error, make sure you're the folder exists that you are adding the file to. If it isn't, you will certainly experience this error.
We have a problem with SharePoint's search box. Whenever we try to search for something we get:
Unable to validate data. at
System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean
fEncrypt, Byte[] buf, Byte[] modifier,
Int32 start, Int32 length, IVType
ivType, Boolean useValidationSymAlgo)
at
System.Web.UI.ObjectStateFormatter.Deserialize(String
inputString) exeption.
Does any one know the reason for this exception, or a way to work around it?
New entry:
I'm using a SPGridView where i use the datakeys property in a web part. The webpart works, but we found that using the datakeys property breaks seach in that if you try to use the search textbox and click the seach button it gets this exception:
Unable to validate data. at System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, IVType ivType, Boolean useValidationSymAlgo)
at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString)
This is what i have tryed to do:
Make the gridview not spgridview and set autogenerate true (works)
Remove the datakeynames (works)
Test with a empty gridvew (failes)
Test with a non-empty gridview (failes)
Change Machine Keys (failes)
Turn of view state on the gridvew (failes)
Move the gridview ti a ascx file (failes)
I can't seem to figure this one out. Have enyone got this error and been able to work around it?
EDit 10.09.2009
This is the last code I tested. I used a MSDN excample as referance. I have also tried without Data table MSDN Example
public class TestErrorGridView : System.Web.UI.WebControls.WebParts.WebPart
{
Control ascxToAdd;
protected DataTable PropertyCollection = new DataTable();
private DataColumn key;
public TestErrorGridView()
{
key = PropertyCollection.Columns.Add("ID", typeof(string));
PropertyCollection.Columns.Add("Name", typeof(string));
}
public void AddProperty(TestBindObject data)
{
DataRow newRow = PropertyCollection.Rows.Add();
newRow["ID "] = data.ID;
newRow["Name"] = data.Name;
}
public void BindGrid(SPGridView grid)
{
SPBoundField fldPropertyName = new SPBoundField();
fldPropertyName.HeaderText = "ID";
fldPropertyName.DataField = "ID";
grid.Columns.Add(fldPropertyName);
SPBoundField fldPropertyValue = new SPBoundField();
fldPropertyValue.HeaderText = "Name";
fldPropertyValue.DataField = "Name";
grid.Columns.Add(fldPropertyValue);
PropertyCollection.PrimaryKey = new DataColumn[] { key };
grid.DataSource = PropertyCollection.DefaultView;
grid.DataKeyNames = new string[] { key.ColumnName };
grid.DataBind();
}
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
}
protected override void CreateChildControls()
{
base.CreateChildControls();
TestBindObject t1 = new TestBindObject() { ID = 1, Name = "Test3" };
this.AddProperty(t1);
SPGridView testGrid = new SPGridView() { AutoGenerateColumns = false };
this.BindGrid(testGrid);
this.Controls.Add(testGrid);
}
}
[Serializable]
public class TestBindObject
{
public int ID { get; set; }
public string Name { get; set; }
}
From the error message I'd say that you are operating in a web-farm environment. Have you set the same machineKey in each of the SharePoint web.config files? See this link for a little more info.