Develop Reference

File.Exists(Path) always return false when get 'string (Path)' from text file

I write codes to receive the path of a text file and store it in a string variable that I declare in public.
Then I want to know if the file exists or not by using
System.IO.File.Exists(pathoffile)
But it always returns false even though there is a file.
And then when I try to add the string path directly like this
public string propertyfile = #"C:\Users\PFA Wongsawat\Desktop\part_no_and_path_list.txt"
The function
System.IO.File.Exists(pathoffile)
return true
I already check the receive path(string) that I read from the text file. By cutting off "\n" and "\r" and using trim() too.But it still returns false.
Have I missed something? What difference between these two?. I'm too new to this c#. I'm very bad at this sorry in advance.
Here are my codes
public string pathfromread, partnumber, pathfile, portname, partnofromserial,propertypathfile; //Declare Variables
public string propertyfile = #"C:\Users\PFA Wongsawat\Desktop\Properties.txt";
public string pathoffile ;
public string backuppath ;
public string pdffolderpath ;
private void propertyget()
{
if (File.Exists(propertyfile))
{
StreamReader readpropertyfile = new StreamReader(propertyfile);
string readproperty;
while ((readproperty = readpropertyfile.ReadLine()) != null)
{
string[] propertyfromread = readproperty.Trim().Split('=');
if (propertyfromread.GetValue(0).ToString() == "pathoffile")
{
pathoffile = propertyfromread.GetValue(1).ToString();
pathoffile = pathoffile.Replace("\n", "").Replace("\r", "");
MessageBox.Show(pathoffile, "path file");
}
else if ((propertyfromread.GetValue(0).ToString() == "backuppath"))
{
backuppath = propertyfromread.GetValue(1).ToString();
backuppath = backuppath.Replace("\n", "").Replace("\r", "");
MessageBox.Show(backuppath);
}
else if ((propertyfromread.GetValue(0).ToString() == "pdffolderpath"))
{
pdffolderpath = propertyfromread.GetValue(1).ToString();
pdffolderpath = pdffolderpath.Replace("\n", "").Replace("\r", "");
MessageBox.Show(pdffolderpath);
}
else if ((propertyfromread.GetValue(0).ToString() == "portname"))
{
portname = propertyfromread.GetValue(1).ToString();
portname = portname.Replace("\n", "").Replace("\r", "");
MessageBox.Show(portname);
}
}
}
private void Form1_Load(object sender, EventArgs e)
{
propertyget();
dv = dt.DefaultView; //set dv index count to != 0 to prevent error from null input when click on remove button
if (System.IO.File.Exists(pathoffile))//Check if file exist or not
{
}
else
{
try
{
MessageBox.Show("Database Text File Missing. Please Select New File", "Database Text File Missing", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
OpenFileDialog regispath = new OpenFileDialog();
regispath.Title = "Select Database Text File (part_no_and_path_list.txt)";
regispath.Multiselect = false;
regispath.Filter = "Text file (*.txt)|*.txt";
regispath.RestoreDirectory = true;
regispath.ShowDialog();
pathfile = regispath.FileName;
File.Copy(pathfile, pathoffile);
}
catch
{
And this is my property text file
pathoffile=#"C:\Users\PFA Wongsawat\Desktop\part_no_and_path_list.txt"
backuppath=#"C:\Users\PFA Wongsawat\Documents\part_no_and_path_list.txt"
pdffolderpath=#"C:\Users\PFA Wongsawat\Downloads\"
portname=COM3
In this case the result always a messageBox showing "Database Text File Missing. Please Select New File"
Thank you and sorry for my bad English.

You don't put #" and " in the text file, you only put them in the code because that's how the c# compiler knows they're strings (and knows not to interpret slashes as an escape character)
Just make your text file look like:
pathoffile=C:\Users\PFA Wongsawat\Desktop\part_no_and_path_list.txt
I also recommend you use:
Split(new []{'='}, 2)
This will allow you to use = in your path, by making split return a maximum of 2 split values; any = that are legitimately in the path would be preserved
Actually I recommend you use one of the various built in settings mechanisms that c# has; we haven't needed to read and write our own configuration files for about 25 years
If you really do want to continue rolling your own you can reduce your code massively by using a dictionary
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
public class Settings{
private Dictionary<string,string> _conf = new Dictionary<string,string>();
public string PathOfFile {
get => _conf["pathoffile"];
}
public void ReadConfig(){
File.ReadAllLines("conf.txt").ToDictionary(
x => x.Split(new[]{'='},2)[0],
x => x.Split(new[]{'='},2)[1]
);
}
}
Yep, it's all you need. Every time you want to add another setting, add another property (like public string PathOfFile), add another love to the file and make sure the string in the property matches the line in the file
In other areas, please read up on c# naming conventions; PublicThingsAreNamedLikeThis, _privateLikeThis, localLikeThis, neverlikethis

Thank you I've already solved this problem
By remove "#" and '""' from path in the property text file like this.
pathoffile=C:\Users\PFA Wongsawat\Desktop\part_no_and_path_list.txt
backuppath=C:\Users\PFA Wongsawat\Documents\part_no_and_path_list.txt
pdffolderpath=C:\Users\PFA Wongsawat\Downloads\
portname=COM3
The reason I can't see this because I debug the program by seeing the result in message box and it not match with the real one. Thank you.

Delete files based on variable SSIS Script

I have a script in ssis which deletes the file and I need to modify the script by adding variable so that process can be executed dynamically. I would appreciate if some can help me out by showing how to add variable in the script below:-
enter public void Main()
{
int RetentionPeriod = 0;
string directoryPath = #"\\ABCD\EFG\HIJ";--need to add location variable
string[] oldFiles = System.IO.Directory.GetFiles(directoryPath, "*.csv");
foreach (string currFile in oldFiles)
{
FileInfo currFileInfo = new FileInfo(currFile);
if (currFileInfo.LastWriteTime < (DateTime.Now.AddDays(-RetentionPeriod)))---need to add date variable here
{
currFileInfo.Delete();
}
}
// TODO: Add your code here
Dts.TaskResult = (int)ScriptResults.Success;
}
}
}
As shown in the script I need to add two variable namely location variable and Date variable.Both the variables have string data type
I know this question is very silly but I have no exp in writing SSIS scripts

string directoryPath = Dts.Variables["User::NameOfStringVariable"].Value
You also have to add the variable to the ReadOnly list on the script task configuration. here is a screen shot from another question that shows you where to make the variable accessible to the script:
and in case you don't know where/how to add a variable to a package. One easy way is to right click on the grey area of the control flow and choose variables and that will bring up the variables window then simply add the variable with the appropriate datatype that you want.

this is over coded: try this:
set a variable as answered above to contain the file path
Add this to main after setting a System.IO; reference
public void Main()
{
string FilePath = Dts.Variables["UserControl::File"].Value.ToString();
if (File.Exists(FilePath))
{
File.Delete(FilePath);
}
Dts.TaskResult = (int)ScriptResults.Success;
}

C# - my ReadLine() gives me a null value when I should get a string

Solved - Accidentally wiped the actual file of data but the ide doesn't update that file unless you reopen it so I thought the data was still in there.
I'm working on a project in C# that reads in a fake inventory and then transactions to go with that inventory in another class. I know the code is quite messy at the moment, i'm just trying to figure out one thing specifically.
this code here will read in my file "Inventory.in", check if the file exists(which it does) and then start my streamreader and readline into a string.
private void btnFill_Click(object sender, EventArgs e)
{
string strInputLine;
string inFile = "Inventory.in";
StreamReader iSR;
InvRec currInvent;
if (File.Exists(inFile))
{
iSR = new StreamReader(inFile);
strInputLine = iSR.ReadLine();
while (strInputLine != null)
{
all of it isn't there but the point of emphasis is that the
"strInputLine = iSR.ReadLine();"
does indeed give me the correct value from that file.
now moving on to my question, the second block of code from another button is below:
private void btnProcess_Click(object sender, EventArgs e)
{
string strInputVal;
string inFileName = "Transactions.in";
TransRec currTrans;
StreamReader iSR2;
transListClass transactionList = new transListClass();
InvRec inventItem = inventoryList.Retrieve();
if (File.Exists(inFileName))
{
iSR2 = new StreamReader(inFileName);
strInputVal = iSR2.ReadLine();
while (strInputVal != null)
{
my problem lies when I try and do my ReadLine() into iSR2. it gives me null instead of the value from the file I'm supposed to get. Everything is the same otherwise, it just refuses to give me the correct value. I'm following the debugger in Visual Studio 2010, so I know the file is found and exists, I see it being opened, just a null value instead of my string I need.
Thank you to anybody in advance, I appreciate it.
-Anthony
edit:
the second block of code is supposed to read from "Transactions.in" instead of the first one that reads from "Inventory.in"
Important edit:
I have noticed when i changed "Transactions.in" to "Inventory.in" in the second block of code for the process button, it reads the values from Inventory.in and gives me a proper string unlike null from Transactions.in. The file is found and is just a text file named Transactions.in that was provided by my teacher, nobody else had a problem with it.

Select multiple image files using fileupload control(ASP.net C#) and save it in database in one click.

I am able to select multiple files using fileupload control but when I try to save it to a database it's giving me an "Object reference not set to an instance of an object" error.
if (FileUpload1.HasFiles)
{
foreach (HttpPostedFile uploaded in FileUpload1.PostedFiles)
{
bindata = new BinaryReader(uploaded.InputStream);
ImageByteArray = bindata.ReadBytes(uploaded.ContentLength);
// byte array is sent to a method
dbmt.SaveImageToDB(ImageByteArray);
}
}
And the following is my code for the SaveImageToDB method
public void SaveImageToDB(byte[] ImageByteArray)
{
try
{
scon.Open();
scm.Connection = scon;
scm.CommandType = CommandType.StoredProcedure;
scm.CommandText = "SaveProfileImage";
SqlParameter paramImgArray = scm.Parameters.Add("#ImgBody", SqlDbType.Image,0);
paramImgArray.Direction = ParameterDirection.Input;
paramImgArray.Value = ImageByteArray;
scm.ExecuteNonQuery();
}
catch( SqlException sqx )
{
throw sqx;
}
}

Set The Property AllowMultiple = True in fileupload control.
protected void uploadFile_Click(object sender, EventArgs e)
{
if (UploadImages.HasFiles)
{
foreach (HttpPostedFile uploadedFile in UploadImages.PostedFiles)
{
uploadedFile.SaveAs(System.IO.Path.Combine(Server.MapPath("~/Images/"),
uploadedFile.FileName));
listofuploadedfiles.Text += String.Format("{0}<br/>", uploadedFile.FileName);
}
}
}

I understand that it is giving an error in the said method, but on which line inside that method is giving this error?
I assume that the method you have given here is complete (i.e. there is no code which you have deleted before pasting it here), so i guess there are only 2 objects which could be null and those are "scon" and "scm". Put a breakpoint on the line "scon.Open();" and on line "scm.Connection = scon;". Once the execution stops on each of these lines, hover your mouse over "scon" and then over "scm". I guess either one of them will be null.
Hope this helps.

The problem was my object. It was not instantiated correctly. I was accessing a class within appcode called DBmiddleTier to access a database and write the image file. Here is what I did wrong: DBMiddleTier dbmt; <-----"WRONG". Here is what I did to correct the problem DBMiddleTier dbmt = new DBMiddleTier();

C# String Property and string literal concatenation issue

I am a bit new at C# and I have run into a string concatenation issue. I am hoping someone might be able to give me a hint and help me resolve this. I have searched Google extensively and have spent more than a week on this so any help/advice would be greatly appreciated.
I have created a custom PathEditor for a string property. The property basically allows the user to key in a file to use in the app. If the file typed in is correct, it shows in the property cell as it should. What I am trying to do is output to the property cell an error message if the file typed in does not exist - I check this in my file validator. Here is the string literal issue.
If I use:
return inputFile+"Error_";
this works OK and I get the outpur file123.txtError_ in the property grid cell.
If I use:
return "Error_"+inputFile;
I get only the inputFile without the literal "Error_". Sot he property grid cell shows file123.txt in the property grid cell.
I have checked and inputFile is a string type. Any ideas as to why this is happening?
Also, is there any way to change to font, and/or, color of the message output? I tried to change the background of the property grid cell and I understand that this is not possible to do.
Thank you.
Z
More of the code:
[
Description("Enter or select the wave file. If no extension, or a non .wav extension, is specified, the default extension .wav will be added to the filename."),
GridCategory("Sound"),
Gui.Design.DisplayName ("Input Sound"),
PathEditor.OfdParamsAttribute("Wave files (*.wav)|*.wav", "Select Audio File"),
Editor(typeof(PathEditor), typeof(System.Drawing.Design.UITypeEditor))
]
public string InputWavefile
{
get { return System.IO.Path.GetFileName(inputtWavefile); }
set
{
if (value != inputWavefile) // inputWavefile has been changed
{
// validate the input stringg
_inputWavefile = FileValidation.ValidateFile(value);
// assign validated value
inputWavefile = _inputWavefile;
}
}
}

My guess is that you've got a funky character at the start of inputFile which is confusing things - try looking at it in the debugger using inputFile.ToCharArray() to get an array of characters.
The string concatenation itself should be fine - it's how the value is being interpreted which is the problem, I suspect...

I'm guessing your filename looks something like this, C:\Folder\FileName.txt when you start out.
In your FileValidation.ValidateFile() method you
return "Error_" + InputFileName;
it now looks like this: Error_C:\Folder\FileName.txt.
So, when you run the line below,
get { return System.IO.Path.GetFileName( _inputWavefile ); }
it strips off the path and returns the filename only, FileName.txt.
Even when the filename is not valid, you are still running System.IO.Path.GetFileName() on it.

Assuming this is a PropertyGrid in winforms app. Then it's neither a string concatenation issue, nor PropertyGrid issue, as could be proven by the following snippet. So you need to look elsewhere in your code:
public partial class Form1 : Form {
PropertyGrid pg;
public Form1() {
pg = new PropertyGrid();
pg.Dock = DockStyle.Fill;
this.Controls.Add(pg);
var inputFile = "some fileName.txt";
var obj = new Obj();
obj.One = "Error_" + inputFile;
obj.Two = inputFile + "Error_";
pg.SelectedObject = obj;
}
}
class Obj {
public string One { get; set; }
public string Two { get; set; }
}