In order to be able to read a file in asp.net, the file path must be written in this:
1.
C:\\yung\\Desktop
returns
however, the string that the fileUpload get returns is
2.
C:\yung\Desktop
After reading the comments i have this code:
string FilePath = FileUploadPublicInfo.PostedFile.FileName;
System.IO.StreamReader file = new System.IO.StreamReader(FilePath);
string line = File.ReadLines(FilePath.ToString()).Skip(4).ToString();
TextBox1.Text = line.ToString();
But now its giving this error:
System.Linq.Enumerable+<SkipIterator>d__30`1[System.String]
How to solve this problem?
Thank you.
I'm not so sure I understand the question, but I think you are looking for string.Replace:
string DoubleSlash(string singleSlash)
{
return singleSlash.Replace(#"\", #"\\");
}
The reason backslashes disappear is that C# compiler treats slashes in string literals as a special "escape" character. Because of this treatment, backslash needs to be encoded as two slashes in a regular string literal.
C# offers two ways of inserting backslashes the way you need:
Use verbatim literals - prefix it with "at" sign, i.e. #"C:\\yung\\Desktop", or
Double each slash - put two slashes for each slash in the result: C:\\\\yung\\\\Desktop
Ok, i have manage to solve this problem, turns out it was not reading anything.
This is the code that i finally get:
This is to retrieve the File's path, using this, would give the file path will double slash, so there is not a need for Replace(#"\",#"\")
string FilePath = FileUploadPublicInfo.PostedFile.FileName;
Then read the specified file
System.IO.StreamReader file = new System.IO.StreamReader(FilePath);
If you know which line you specifically want, this retrieves the 5th line
string line = File.ReadLines(FilePath.ToString()).Skip(4).First().ToString();
Thank you so much for your help...
Related
I'm completely a junior here. I have tried something like
save a path and file string in a file like:
c:\aaa\bbb\text.txt
then I need to read again as path but I get c:\aaa\bbb\text.txt from streamreader, but I need c:\\\aaa\\\bbb\\\text.txt
Can anyone help me?
I think you might be confusing string literals with a string.
Say I write var myString = "\\" or var myString = #"\", this will show in the debugger as \\, because the debugger will format it as a literal. But if print it to the console, a file, or press the magnifying glass next to the string in the debugger, it will be shown as \, because that is the actual string value. See also verbatim string literal
So, if you do myStreamWriter.Write("c:\\aaa\\bbb\\text.txt");, you will be actually saving the string c:\aaa\bbb\text.txt, and that is also the string that will be read back.
However I fail to understand why you would want three slashes, I can only assume the OP thinks the escaping is done multiple times.
I need to send the value I receive from the model with this link, the proposalName field must be in quotes.How can I do it?
Here is my service url.
string path = string.Format("{ProposalId:{proposalId},ProposalName:{"proposalName"},VendorId:{vendorId}}",
Uri.EscapeDataString(proposalId.ToString()),
Uri.EscapeDataString(proposalName),
Uri.EscapeDataString(vendorId.ToString()));
You can simply put quotes around by escaping the quotes, like this -
string path = string.Format("{{0},ProposalName:\"{1}\",VendorId:{2}}",
Uri.EscapeDataString(proposalId.ToString()),
Uri.EscapeDataString(proposalName),
Uri.EscapeDataString(vendorId.ToString()));
As per your updated question, if you need to pass double quotes in URL, you need to encode it to %22
You can also use URI which allows a lot of flexibility with urls. For example -
Uri myUri = new Uri("http://google.com/search?hl=en&q=\"query with quotes\"");
Going with your example - Replace EscapeDataString with Uri.EscapeUriString. It will escape the chracter to form a valid URL. " will get replaced by %22
Some suggestions here and here-
Your problem exactlly in the {"1"} part. The double quotation mark " should be outside the {}, not inside them.
here is the fixed code.
string path = string.Format("{{0},ProposalName:\"{1}\",VendorId:{2}}",
Uri.EscapeDataString(proposalId.ToString()),
Uri.EscapeDataString(proposalName),
Uri.EscapeDataString(vendorId.ToString()));
or
string path = string.Format(#"{{0},ProposalName:""{1}"",VendorId:{2}}",
Uri.EscapeDataString(proposalId.ToString()),
Uri.EscapeDataString(proposalName),
Uri.EscapeDataString(vendorId.ToString()));
and if you are using C# 6 then you can write it as following
string path = $"{Uri.EscapeDataString(proposalId.ToString())},ProposalName:\"{Uri.EscapeDataString(proposalName)}\",VendorId:{Uri.EscapeDataString(vendorId.ToString())}";
This might do the trick for you
\"{1}\"
instead of
{"1"}
because you can put \ symbol to indicate escape sequence followed by a reserved characters
So
string.Format("{{{0},ProposalName:\"{1}\",VendorId:{2}}}",
I think escaping the quotes and placing them outside the brackets will work:
"{{0},ProposalName:\"{1}\",VendorId:{2}}"
Depending on the C# version, you can also do it like this, which I often think is an easier and cleaner way to do it:
string path = $"{proposalId},ProposalName:\"{proposalName}\",VendorId:{vendorId}";
You have two problems:
Wrong quotation (should be outside the braces {...} and escaped)
Incorrect { and } escape: {{ means just a single '{' in a formatting string
Should be
string path = string.Format("{{{0},ProposalName:\"{1}\",VendorId:{2}}}",
please, notice
escaped quotations \" which are outside {1}
tripled curly braces{{{ and }}}
Edit: in your edited question you have the same errors:
string format =
"http://mobile.teklifdosyam.com/VendorReport/GetListProposalService?&page=1&start=0&limit=10&filter=" +
"{{ProposalId:{0},ProposalName:\"{1}\",VendorId:{2}}}";
string path = string.Format(format,
Uri.EscapeDataString(proposalId.ToString()),
Uri.EscapeDataString(proposalName),
Uri.EscapeDataString(vendorId.ToString()));
please, notice escaped quotations \" which are outside the {1}, double '{{' and tripled '}}}'. When formatting you have to use numbers as place holders: so {"proposalName"} must be changed into {0}
In my Application there is a class that works with PdfSharp to generate some PDF reports. I specified output folder as a string with verbatim
string file_path = #"D:\Intranet\Students\DailyMarks\";
Also there is a StringBuilder that generates file name based on some ID and DateTime:
... sb.Append(document.Type); sb.Append(document.Id); sb.Append(DateTime.Now.ToShortString());
And finally I do the following
file_path + sb.toString();
But my Application cathes an exception. After debugging session I see that actually my file_path is
file_path = "D:\\Intranet\\Students\\DailyMarks\\...";
As I understand it happens after concatenation of origin file with StringBuilder's toString() call.
I tried to replace file_path string with something like this:
file_path = file_path.Replace(#"\\",#"\");
but it doesn't work. Where did I do wrong?
Probably this is caused by the DateTime.Now.ToShortString() method, which adds forbidden characters to the path (:).
It's totally fine.
"D:\\Intranet\\Students\\DailyMarks\\..." == #"D:\Intranet\Students\DailyMarks\..."
In regular string you need to escape slashes, in verbatim it's done automatically
Another similar situation I faced today was about sending Japanese 「：」 (colon with whole inside) as a file's name's element and it worked. I wonder, why Russian colon calls an exception and Japanese not. Very interesting.
I created a directory inside my WPF solution called Sounds and it holds sound files.(For example: mySound.wav).
Inside my code I use a List and there I have to add to those strings that relate to the sound files. In the beginning I used #"C:..." but I want it to be something like "UNIVERSAL" path. I tried using: "\Sounds\mySound.wav" but it generates an error.
The lines that I use there this directory are:
myList.Add("\Sounds\11000_0.2s.wav");//Error
using (WaveFileReader reader = new WaveFileReader(sourceFile))
where sourceFile is a string which express a path of the file.
Make sure that you check CopyToOutputDir in the properties of the soundfile, that will make sure the file is copied to the location you program runs from.
Also don't use single backslashes in the path since its an escape character.
Instead, do one of the following things:
Use a verbatim string:
#"Sounds\11000_0.2s.wav"
Escape the escape char:
"Sounds\\11000_0.2s.wav"
Use forward slashes:
"Sounds/11000_0.2s.wav"
For more information on string literals check msdn.
You either need to escape the / in the string or add the string literal indicator # at the beginning of the string.
Escape example:
var myFilePath = "c:\\Temp\\MyFile.txt";
String literal example:
var myFilePath = #"c:\Temp\MyFile.txt";
Using System.IO, I tried the following code:
string[] files = Directory.GetFiles("\\folder\\folder_2\\folder_3");
And got the following exception:
"System.IO.DirectoryNotFoundException - It was not possible to locate part of the path 'C:\folder\folder_2\folder_3)' "
I don't know why "c:\" was added to the original string, and I can't seem to keep the method from doing so. What am I doing wrong?
Any help is much appreciated.
A backslash (\) at the start of a path makes it an absolute path. Remove the first \ if you want a relative path:
string[] files = Directory.GetFiles("folder\\folder_2\\folder_3");
You need to escape each of the beginning backslashes in your path, you only escaped a single slash. Use either correct escaping:
string[] files = Directory.GetFiles("\\\\folder\\folder_2\\folder_3");
Or you can use a verbatim string literal:
string[] files = Directory.GetFiles(#"\\folder\folder_2\folder_3");
Full explanation found in MSDN Documentation
In addition to the answers provided, you could use verbatim string literals, which will pass the string exactly without the need for escaping with all the messy backslashes.
In your case this would be
string[] files = Directory.GetFiles(#"folder\folder_2\folder_3");
Notice that the # is outside of quotes, but stuck to the opening quotes, this tells C# to use it, (pardon the pun) literally. The syntax highlighting for this kind of string will also change in Visual Studio, just FYI.
edit: saw a comment by another user advising you to use the #, it's the same thing. Sorry did not see this earlier.
Read about them here at MSDN