I have a xamarin app where I need to read from a json file I have added in the Asset folder.
This is how the folder tree is in the solution explorer.
The code being used to read this json file is called from the User class in the Model folder.
This is how I have tried to access this file.
string path = Path.Combine(Directory.GetCurrentDirectory(), "..", "Assets", "data", "User.json");
var assembly = typeof(User).GetType().Assembly;
var stream = assembly.GetManifestResourceStream($"{assembly.GetName().Name}.{"User.json"}");
using (var reader = new StreamReader(stream))
{
string jsonString = await reader.ReadToEndAsync();
users = JsonConvert.DeserializeObject<List<User>>(jsonString);
}
The stream variable is null.
Please help out.
First check that you have set User.json file to Buid Action:EmbeddedResource.
then do like below:
var assembly = IntrospectionExtensions.GetTypeInfo(typeof(User)).Assembly;
Stream stream = assembly.GetManifestResourceStream("TravulRecd.Assets.data.User.json");
string jsonString = "";
using (var reader = new System.IO.StreamReader(stream))
{
jsonString = reader.ReadToEnd();
}
Related
I need to save the information from an input page into a JSON File and output the information onto another page reading from the JSON File. I've tried many things and what seemed to work for me is using the specialfolder localapplication data.
Now, I don't quite understand how I can output the information and also check if the data is even put in correctly.
I previously used StreamReader to output the information on the JSON file and then put it on a ListView but this doesn't work if I have the file in the specialfolder. It says "stream cant be null". The commented out code is the code I tried in previous attempts.
Code:
ListPageVM (Read Page)
private ObservableCollection<MainModel> data;
public ObservableCollection<MainModel> Data
{
get { return data; }
set { data = value; OnPropertyChanged(); }
}
public ListPageVM()
{
var assembly = typeof(ListPageVM).GetTypeInfo().Assembly;
Stream stream = assembly.GetManifestResourceStream(Path.Combine(System.Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "eintraege.json"/"SaveUp.Resources.eintraege.json"/));
//var file = Path.Combine(System.Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "eintraege.json");
using (var reader = new StreamReader(stream))
{
var json = reader.ReadToEnd();
List<MainModel> dataList = JsonConvert.DeserializeObject<List<MainModel>>(json);
data = new ObservableCollection<MainModel>(dataList);
}
}
MainPageVM (Write Page)
public Command Einfügen
{
get
{
return new Command(() =>
{
// Data ins Json
_mainModels.Add(DModel);
Datum = DateTime.Now.ToString("dd.mm.yyyy");
//var assembly = typeof(ListPageVM).GetTypeInfo().Assembly;
//FileStream stream = new FileStream("SaveUp.Resources.eintraege.json", FileMode.OpenOrCreate, FileAccess.Write);
var file = Path.Combine(System.Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "eintraege.json");
//Stream stream = assembly.GetManifestResourceStream("SaveUp.Resources.eintraege.json");
if (!File.Exists(file))
{
File.Create(file);
}
using (var writer = File.AppendText(file))
{
string data = JsonConvert.SerializeObject(_mainModels);
writer.WriteLine(data);
}
});
}
}
you are trying to read and write resources, not files. That won't work. Instead do this
var path = Path.Combine(System.Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "eintraege.json");
File.WriteAllText(path, myjson);
to read the data back
var json = File.ReadAllText(path);
In public ScenarioPage() of ScenarioPage.cs I have the following code to read from a json file:
var assembly = typeof(ScenarioPage).GetTypeInfo().Assembly;
Stream stream = assembly.GetManifestResourceStream("firstSession.json");
using (StreamReader reader = new StreamReader(stream)) // System.ArgumentNullException
{
var json = reader.ReadToEnd();
List<SessionModel> data = JsonConvert.DeserializeObject<List<SessionModel>>(json);
foreach(SessionModel scenario in data)
{
label.Text = scenario.title;
break;
};
}
I am getting an ArgumentNullException for the stream input. firstSession.json is in the same folder as ScenarioPage.cs, and it is set as an embedded resource. It seems like Visual Studio is not recognizing that my json file is there. Is this is a bug? Or is there something wrong with my code?
Where did you put the Json File, I put it in the Json File in the root Of PCL like following screenshot.
Then use following code to read the Json File.
void GetJsonData()
{
string jsonFileName = "firstSession.json";
ContactList ObjContactList = new ContactList();
var assembly = typeof(MainPage).GetTypeInfo().Assembly;
Stream stream = assembly.GetManifestResourceStream($"{assembly.GetName().Name}.{jsonFileName}");
using (var reader = new System.IO.StreamReader(stream))
{
var jsonString = reader.ReadToEnd();
//Converting JSON Array Objects into generic list
ObjContactList = JsonConvert.DeserializeObject<ContactList>(jsonString);
}
EmployeeView.ItemsSource = ObjContactList.contacts;
}
And here is running GIF.
I update my demo to you. you can test it
https://github.com/851265601/Xamarin.Android_ListviewSelect/blob/master/PlayMusicInBack.zip
I am using the below code to read a file from sharepoint 2019 and the return values are not string. Example of return values: 0\0\0(\u0001\0\0\u001e\0\0\0\0\0\0
using (ClientContext clientContext = new ClientContext("http://sharepoint2019/sites/test/"))
{
KeywordQuery keywordQuery = new KeywordQuery(clientContext);
keywordQuery.QueryText = "SharePoint";
keywordQuery.EnablePhonetic = true;
SearchExecutor searchExecutor = new SearchExecutor(clientContext);
ClientResult<ResultTableCollection> results = searchExecutor.ExecuteQuery(keywordQuery);
clientContext.ExecuteQuery();
foreach (var resultRow in results.Value[0].ResultRows)
{
Console.WriteLine("{0}: {1} ({2})", resultRow["Title"], resultRow["Path"], resultRow["Write"]);
File file= clientContext.Web.GetFileByUrl(resultRow["Path"].ToString());
var stream = file.OpenBinaryStream();
clientContext.Load(file);
clientContext.ExecuteQuery();
FileInformation fileInformation = File.OpenBinaryDirect(clientContext, (string)file.ServerRelativeUrl);
using (System.IO.StreamReader sr = new System.IO.StreamReader(fileInformation.Stream))
{
// Read the stream to a string, and write the string to the console.
String line = sr.ReadToEnd();
Console.WriteLine(line);
}
}
}
If you are reading some files like Word (not txt file), you will need use Open Xml library to read the string in Word, filestream can't return the real string as expected:
Get Plain Text of a Word Document using Open XML (CSOpenXmlGetPlainText)
Open a word processing document from a stream (Open XML SDK)
I am trying to make a program which is able to download files with URI(URL) using httpwebrequest and cookies(for credential information to keep login status).
I can download files with following code but files get corrupted after being downloaded.
when I download xlsx file(on the web page) into text file at local drive, I see some part of numbers and words from an original file in a corrupted file, therefore I assume I have reached to the right file.
however, when I download xlsx file(on the web page) in xlsx file at local drive, it seems like it fails to open saying
excel cannot open the file 'filename.xlsx' because the file format or
file extension is not valid. Verify that the file has not been
corrupted and that the file extension matches the format of the file.
Is there any way I can keep fully original file content after I download?
I attach a part of result content as well.
private void btsDownload_Click(object sender, EventArgs e)
{
try
{
string filepath1 = #"PathAndNameofFile.txt";
string sTmpCookieString = GetGlobalCookies(webBrowser1.Url.AbsoluteUri);
HttpWebRequest fstRequest = (HttpWebRequest)WebRequest.Create(sLinkDwPage);
fstRequest.Method = "GET";
fstRequest.CookieContainer = new System.Net.CookieContainer();
fstRequest.CookieContainer.SetCookies(webBrowser1.Document.Url, sTmpCookieString);
HttpWebResponse fstResponse = (HttpWebResponse)fstRequest.GetResponse();
StreamReader sr = new StreamReader(fstResponse.GetResponseStream());
string sPageData = sr.ReadToEnd();
sr.Close();
string sViewState = ExtractInputHidden(sPageData, "__VIEWSTATE");
string sEventValidation = this.ExtractInputHidden(sPageData, "__EVENTVALIDATION");
string sUrl = ssItemLinkDwPage;
HttpWebRequest hwrRequest = (HttpWebRequest)WebRequest.Create(sUrl);
hwrRequest.Method = "POST";
string sPostData = "__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=" + sViewState + "&__EVENTVALIDATION=" + sEventValidation + "&Name=test" + "&Button1=Button";
ASCIIEncoding encoding = new ASCIIEncoding();
byte[] bByteArray = encoding.GetBytes(sPostData);
hwrRequest.ContentType = "application/x-www-form-urlencoded";
Uri convertedURI = new Uri(ssDwPage);
hwrRequest.CookieContainer = new System.Net.CookieContainer();
hwrRequest.CookieContainer.SetCookies(convertedURI, sTmpCookieString);
hwrRequest.ContentLength = bByteArray.Length;
Stream sDataStream = hwrRequest.GetRequestStream();
sDataStream.Write(bByteArray, 0, bByteArray.Length);
sDataStream.Close();
using (WebResponse response = hwrRequest.GetResponse())
{
using (sDataStream = response.GetResponseStream())
{
StreamReader reader = new StreamReader(sDataStream);
{
string sResponseFromServer = reader.ReadToEnd();
FileStream fs = File.Open(filepath1, FileMode.OpenOrCreate, FileAccess.Write);
Byte[] info = encoding.GetBytes(sResponseFromServer);
fs.Write(info, 0, info.Length);
fs.Close();
reader.Close();
sDataStream.Close();
response.Close();
}
}
}
}
catch
{
MessageBox.Show("Error");
}
}
StreamReader is for dealing with text data. Using it corrupts your binary data(excel file).
Write sDataStream directly to file. For ex.
sDataStream.CopyTo(fs)
PS: I prepared a test case (using similar logic) to show how your code doesn't work
var binaryData = new byte[] { 128,255 };
var sr = new StreamReader(new MemoryStream(binaryData));
var str3 = sr.ReadToEnd();
var newData = new ASCIIEncoding().GetBytes(str3); //<-- 63,63
Just compare binaryData with newData
I have created hierarchical structure for managing file in bucket. Planning to create folder for each month i.e. dec-2017. There will be more than 10k pdf files in each folder.
Written C# code for getting objects from bucket. This code is working fine for accessing files that are on root of bucket. I am having issues with accessing files in folder i.e. my-bucket/dec-2017/test.pdf is not accessed using code.
Refer my bucket structure here
I am using following code, Can anyone don this before?
if (_storageService == null)
{
_storageService = CreateStorageClient();
}
ObjectsResource.GetRequest downloadRequest = null;
//string objectName = "dec-2017%2Ftest.pdf";
string objectName = "dec-2017/test.pdf";
downloadRequest = new ObjectsResource.GetRequest(_storageService, bucketName, objectName);
MemoryStream stream = new MemoryStream();
downloadRequest.Download(stream);
bytes = stream.ToArray();
Please check below sample code -
using Google.Apis.Auth.OAuth2;
using Google.Cloud.Storage.V1;
string file = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Test.csv");
File.WriteAllText(file, "test");
GoogleCredential credential = null;
BucketConnector bucketConnector = new BucketConnector();
credential = bucketConnector.ConnectStream();
var storageClient = StorageClient.Create(credential);
string folderPath = ConfigurationParameters.FOLDER_NAME_IN_BUCKET;
using (FileStream file = File.OpenRead(localPath))
{
objectName = folderPath + Path.GetFileName(localPath);
storage.UploadObject(bucketName, objectName, null, file);
}