I have a project in c# winforms, with a file called: PublicSettings.cs (this file is within a folder called: Class) where I have a variable.
Now, I want to use that variable from another file within the same project.
PublicSettings.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace LVSetup.Class
{
class PublicSettings
{
private string _ConnStr = "Connection";
public string ConnStr
{
get
{
return this._ConnStr;
}
set
{
this._ConnStr = value;
}
}
}
}
I want to use the variable ConnStr in the file: frmLogin.cs
frmLogin.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using LVSetup.Class;
namespace LVSetup
{
public partial class frmLogin : Form
{
public frmLogin()
{
InitializeComponent();
}
private void btnEnter_Click(object sender, EventArgs e)
{
string a = PublicSettings.ConnStr;
}
}
}
But there is no ConnStr within PublicSettings, just (Equals and ReferenceEquals)
What could be wrong here?
You need to make this field static in order to access it without creating a class instance. Or create and instance. What suites the best depends on the logic that you want to apply for this class and how it will be used later.
Instance approach
private void btnEnter_Click(object sender, EventArgs e)
{
var settings = new PublicSettings();
string a = settings.ConnStr;
}
Static field approach
class PublicSettings
{
private static string _ConnStr = "Connection";
public static string ConnStr
{
get
{
return _ConnStr;
}
set
{
_ConnStr = value;
}
}
}
For a connection string, I would either use a Configuration file (app.config) or make the property a static read-only property (since there's often no reason to change a connection string at run-time):
class PublicSettings
{
public static string ConnStr
{
get
{
return "Connection";
}
}
}
Related
My aim is to save the all form data via button click (as opposed to upon closing). To that end, I've used the example given in the following thread. Saving the form state then opening it back up in the same state
I've tried to adapt my code to the best of my ability, but nothing happens, and there are no errors shown. What am I doing wrong?
Here's the relevant parts of my code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Xml.Serialization;
namespace WindowsFormsApplication1
{
public partial class frmPayroll : Form
{
SaveData sd = new SaveData();
public frmPayroll()
{
InitializeComponent();
}
private void saveToolStripMenuItem_Click(object sender, EventArgs e)
{
writeConfig();
}
private void writeConfig()
{
using (StreamWriter sw = new StreamWriter("config.xml"))
{
sd.Married = rdoMarr.Checked;
sd.PayPd = cbPayPd.Text;
sd.Allow = cbAllow.Text;
sd.Gross = txtGross.Text;
sd.Fit = txtFit.Text;
sd.Soc = txtSoc.Text;
sd.Med = txtMed.Text;
sd.NetPay = txtNet.Text;
sd.PayPd = cbPayPd.Text;
XmlSerializer ser = new XmlSerializer(typeof(SaveData));
ser.Serialize(sw, sd);
}
}
private void frmPayroll_Load(object sender, EventArgs e)
{
if (File.Exists("config.xml"))
{
loadConfig();
}
sd.Married = rdoMarr.Checked;
sd.PayPd = cbPayPd.Text;
sd.Allow = cbAllow.Text;
sd.Gross = txtGross.Text;
sd.Fit = txtFit.Text;
sd.Soc = txtSoc.Text;
sd.Med = txtMed.Text;
sd.NetPay = txtNet.Text;
}
private void loadConfig()
{
XmlSerializer ser = new XmlSerializer(typeof(SaveData));
using (FileStream fs = File.OpenRead("config.xml"))
{
sd = (SaveData)ser.Deserialize(fs);
}
}
}
public struct SaveData
{
public bool Married;
public string PayPd;
public string Allow;
public string Gross;
public string Fit;
public string Soc;
public string Med;
public string NetPay;
}
}
You are loading your object by deserializing.
But Where are you assigning the states back to your controls?
look at frmPayroll_Load function.
You are trying to assign the data back to the object again.
You have to assign data back to form controls.
Should be something like this (you may need to apply data conversions if required):
rdoMarr.Checked = sd.Married;
.
.
.
.
txtFit.Text = sd.Fit;
.
.
.
.
I have two solutions TranferService and Sender. TranferService has WCF service and IISHost to host that service. In Sender solution i have windows forms application. In that form i used button to browse and select file, text box to display selected file path, and another button(Send) to transfer that file through WCF service. But i am unable to access textbox value in the transfer solution. it shows"the name does not exist in the current context".
Code for TransferService
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
namespace TransferService
{
// NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "TransferService" in both code and config file together.
public class TransferService : ITransferService
{
public File DownloadDocument()
{
File file = new File();
String path = txtSelectFilePath.Text;
file.Content = System.IO.File.ReadAllBytes(#path);
//file.Name = "ImagingDevices.exe";
return file;
}
}
}
I am getting error on this line
String path = txtSelectFilePath.Text;
code for form.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Sender
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Browse_Click(object sender, EventArgs e)
{
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
txtSelectFilePath.Text = openFileDialog1.FileName;
}
}
private void Send_Click(object sender, EventArgs e)
{
TransferService.TransferServiceClient client = new TransferService.TransferServiceClient();
TransferService.File file = client.DownloadDocument();
System.IO.File.WriteAllBytes(#"C:\DownloadedFiles\" + file.Name, file.Content);
MessageBox.Show(file.Name + " is downloaded");
}
}
}
Code for ITransferService.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
namespace TransferService
{
// NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "ITransferService" in both code and config file together.
[ServiceContract]
public interface ITransferService
{
[OperationContract]
File DownloadDocument();
}
[DataContract]
public class File
{
[DataMember]
public string Name { get; set; }
[DataMember]
public byte[] Content { get; set; }
}
}
Thanx a lot in advance..........
Then create a constructor to your class that receives a path as string something like this:
public class TransferService : ITransferService
{
private string _path;
public TransferService(string path) {
_path = path
}
public File DownloadDocument()
{
File file = new File();
//String path = txtSelectFilePath.Text;
file.Content = System.IO.File.ReadAllBytes(_path);
//file.Name = "ImagingDevices.exe";
return file;
}
}
and then on form.cs
TransferService.TransferServiceClient client = new TransferService.TransferServiceClient(txtSelectFilePath.Text);
I'm doing some test using the .NET 4.5 TestTools and Visual Studio 2010. I m testing a singleton class that creates an COM Instance somewhere during construction/initialization, so the classes state will be keep the same in all tests. The Problem is, each test runs for itself, running all test will give a strange result - the first test succeeds, all other fail
"System.Runtime.InteropServices.InvalidComObjectException: COM object
that has been separated from its underlying RCW cannot be used.."
result of a corrupted COM reference (see myComInstance below).
Not quite sure if i explained the problem correctly. Below is my singleton class
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace APITestTrial3
{
public partial class frmMbxControl : Form
{
private frmMbxControl()
{
InitializeComponent();
Connect("abhishek281mbx","PCMBXsrv.281","appmat1.bsd.com");
}
private static frmMbxControl g_Mbx;
public static frmMbxControl GetMbx()
{
if (g_Mbx == null)
{
g_Mbx = new frmMbxControl();
}
return g_Mbx;
}
private string Connect(string mbxName, string serverName, string hostName)
{
// frmControls frm = new frmControls();
mbx.HostName = hostName;
mbx.MbxName = mbxName;
mbx.ServerName = serverName;
mbx.replybox = "replyBox";
if (mbx.Status != 0)
{
if (mbx.Connect())
{
Console.WriteLine("Connected");
return ("Connected");
}
else
{
return ("Not Connected");
}
}
return ("Connected");
}
public String Send(String txnName, String txn)
{
String msgReply = "";
String rep = "";
//mbx.Send(txnName, txn);
mbx.Open("ReplyBox1","c");
mbx.SendAndReply(txnName, txn, "ReplyBox1");
if (mbx.WaitForMsg("ReplyBox1", 0, ref msgReply, ref rep) == CwMboxLib.CwWaitResult.CwWaitOk)
{
rep = msgReply;
mbx.Close("ReplyBox1");
}
return msgReply;
}
private void frmMbxControl_Load(object sender, EventArgs e)
{
}
}
}
Another class uses GetMbx() and Send() method of above class.
I am trying to call a public function inside a public class in my web application but for some reason the function is not accessible even though I can get to the class fine and the function is marked as public. When I call FileUploader, the only options I am given are equals and referanceequals. What stupid thing am I over looking? Please not that the class is in a secondary project called Classes in my app. I do not have problems accessing a difference class in the project that FileUploader is in.
using System;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Auth;
using Microsoft.WindowsAzure.Storage.Blob;
using Microsoft.WindowsAzure;
using System.IO;
using System.Configuration;
using FFInfo.Classes;
namespace FFInfo
{
public partial class FUTest : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
if (fuFile.HasFile)
{
}
}
}
}
FileUploaders.cs
using FFInfo.DAL;
using FFInfo.DAL.Tables;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;
using System;
using System.Web;
namespace FFInfo.Classes
{
public class FileUploader
{
public Int64 UploadSiteImage(string ConnectionString, string ContainerName, string FilePath, HttpPostedFile UploadedFile)
{
CloudStorageAccount SiteImages = CloudStorageAccount.Parse(ConnectionString);
CloudBlobClient SiteImagesBlob = SiteImages.CreateCloudBlobClient();
CloudBlobContainer SiteImageContainer = SiteImagesBlob.GetContainerReference(ContainerName);
SiteImageContainer.CreateIfNotExists();
CloudBlockBlob Image = SiteImageContainer.GetBlockBlobReference(FilePath + UploadedFile.FileName);
using (UploadedFile.InputStream)
{
Image.UploadFromStream(UploadedFile.InputStream);
}
using (var db = new Compleate())
{
File NewFile = new File()
{
ContainerName = ContainerName,
FilePath = FilePath,
FileName = UploadedFile.FileName,
ContentType = UploadedFile.ContentType
};
db.Files.Add(NewFile);
db.SaveChanges();
return NewFile.FileID;
}
}
}
}
Did you perhaps mean for the UploadSiteImage method to be static?
Try (new FileUploader()). <-- will get intelisense here.
But, yeah, you probably want the method to be public static
I keep getting this error and I know why but I need help figuring out how I can solve it. The only way I have been able to add my items it to make a new form but that seems silly.
It wont work if I make all my methods static =(
I keep getting,
"An object reference is required for the non-static field, method, or
property 'Handicap_Calculator.FormMain.listViewLog'
\Form1.cs 74 13 Handicap Calculator"
Here´s my code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Handicap_Calculator
{
public partial class FormMain : Form
{
//FormAddScore FormAddNewScore = new FormAddScore();
public static bool addScoreIsShown = false;
public static FormAddScore _FormAddScore;
public static ListViewItem Item;
//public static List<string> ScoreInfo = new List<string>();
public FormMain()
{
InitializeComponent();
}
public void button1_Click(object sender, EventArgs e)
{
try
{
if (_FormAddScore == null || _FormAddScore.IsDisposed)
{
_FormAddScore = new FormAddScore();
}
_FormAddScore.Show();
if (_FormAddScore.WindowState == FormWindowState.Minimized)
{
_FormAddScore.WindowState = FormWindowState.Normal;
}
_FormAddScore.BringToFront();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
public static void AddScore()
{
int Round = 1;
DateTime date = _FormAddScore.date;
string course = _FormAddScore.course;
int holes = _FormAddScore.holes;
int score = _FormAddScore.score;
float courseRating = _FormAddScore.courseRating;
float slopeRating = _FormAddScore.slopeRating;
string[] ScoreInfo = new string[7];
ScoreInfo[0] = Round.ToString();
ScoreInfo[1] = date.ToString();
ScoreInfo[2] = course;
ScoreInfo[3] = holes.ToString();
ScoreInfo[4] = score.ToString();
ScoreInfo[5] = courseRating.ToString();
ScoreInfo[6] = slopeRating.ToString();
AddToList(ScoreInfo);
}
public static void AddToList(string[] ScoreInfo)
{
Item = new ListViewItem(ScoreInfo);
//listViewLog.Items.Add(Item);
}
}
}
Edit...
Here is the class im calling it from:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Handicap_Calculator
{
public partial class FormAddScore : Form
{
public DateTime date;
public string course;
public int holes;
public int score;
public float courseRating;
public float slopeRating;
public FormAddScore()
{
InitializeComponent();
}
private void FormAddScore_FormClosing(object sender, FormClosingEventArgs e)
{
FormMain.addScoreIsShown = false;
}
public void getscore()
{
try
{
date = dateTimePicker1.Value;
course = textBoxCourse.Text;
holes = Convert.ToInt16(textBoxHoles.Text);
score = Convert.ToInt16(textBoxScore.Text);
courseRating = Convert.ToSingle(textBoxCourseRating.Text);
slopeRating = Convert.ToSingle(textBoxSlopeRating.Text);
}
catch(Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
private void button1_Click(object sender, EventArgs e)
{
getscore();
FormMain.AddScore();
}
}
}
The simple solution is to define your methods AddScore and AddToList as non-static.
public void AddScore()
{
//your code
}
public void AddToList(string[] ScoreInfo)
{
// your code
}
If you want to use static methods you should pass the instance of your Form to the method, on which you want to add items to the ListView.
public static void AddScore(FormMain mainForm)
{
//your code
AddToList(mainForm, ScoreInfo);
}
public static void AddToList(FormMain mainForm, string[] ScoreInfo)
{
// your code
}
Update:
According to your updated code the solution is to pass the instance of your FormMain to your FormAddScore when you create it. In FormAddScore you store the reference to the FormMain instance to call the methods on.
public partial class FormAddScore : Form
{
// your code
private FormMain _mainForm;
public FormAddScore(){
InitializeComponent();
}
public FormAddScore(FormMain mainForm) : this(){
_mainForm = mainForm;
}
In your FormMain when you create the instance of FormAddScore you should use the constructor that expects an instance of FormMain
_FormAddScore = new FormAddScore(this);
With this setup you can change your methods to non-static and you can call the methods of FormMain in your FormAddScore, by using the stored reference in variable _mainForm.
_mainForm.AddScore();