I have a textbox that when user inputs a string such as "<daily" (to signify less than daily) it throws a HttpRequestValidationException. However if there is a space between the less than symbol and the string, it works fine such as "< daily".
I have had it change the value that is submitted in the code behind by using the replace function. For example:
string s = "This is a <test";
if(s.Contains("<")){
s = s.Replace("<", "< "); //I have also used "<" & "<"
}
However, I still get the exception because in the textbox it is still showing it as "<daily". I am wondering if there is a way that if the focus is off the textbox to dynamically add a space to the string?
I understand that the HttpRequestValidationException is not supposed to allow those characters, but it seems to allow if there are spaces. Any thoughts?
It would be nice to know how you use the string in the HttpRequest. Depending on how and where you use we could come up with some ideas.
Related
Okay, I have a string
string textToShow = "this\nrocks"
which when put in label in winforms window will then show
this
rocks
Which is the result I'd like to get. Now, instead of setting the textToShow in the code, I set it in the resource file. When I tried to get the value from resource file using
Properties.Resources.ResourceManager.GetString("textToShow");
the whole string instead will be treated as verbatim, showing
this\nrocks
when put in a label in a winforms window. This is not the result i'm looking for. What's the best way to store strings with special characters in resource file then? I can do string replace for every special characters, like
string.Replace(#"\n", "\n");
but then I need to replace every special characters whenever I call method ResourceManager.GetString, which I think is not the most elegant solution. If there is some ways to make string returned from method ResourceManager.GetString not verbatim, please do tell me.
Thanks
This was already answered here: StackOverflow: How to deal with newline
Basically you have two useful options:
Use shift + enter in the resource manager text editer to add a new line.
Or use String.Format() to replace {0} with \n on read.
The .Net 4.5 framework has the unescape functionality as shown here:
using System.Text.RegularExpressions;
Regex.Unescape(Properties.Resources.ResourceManager.GetString("textToShow"));
solves your issue. Now you can use \n and \u in the resource files.
On the resource editor type "this<shift+enter>rocks" as the resource value.
abc #cnn("sujsl d(*) sfv #nor dsf ",dn,".",#tn); ator '`,`') sds
#cns1 or '`,"\','\",`') fdhg #cns2 sf \",dn,"; nj
How can I get this text as a string in C#. It can not be simply done due to containing " I would prefer to paste it, someway, as it is, rather than replcaing " with \" as my text already contains things like that
One way is, to paste it in a static text Box (textBox1) and then get it as Text of textbox (If I have to use this in a winform) e.g. string st = textBox1.Text
How this type of text can be got in a string variable without using a textBox?
This is a good case for resource files. They will allow you to enter string literals without having to worry about escaping of any kind and are available to you programmatically. See for reference http://msdn.microsoft.com/en-us/library/3xhwfctz(v=vs.100).aspx
Check out string literals, this may be what you are looking for.
I have the following problem with String.Replace:
string str = "0˄0";
str = str.Replace("˄", "&&");
when I print out str, it will be "0&0" instead of "0&&0". To get "0&&0", I have to write
str = str.Replace("˄", "&&&&");
Why is that?
& is a special character in WinForms, used to indicate keyboard shortcuts. Using && is how WinForms escapes the & symbol.
So, to display it in WinForms you are necessarily going to have to place two & characters in your string as you have here:
str = str.Replace("˄", "&&&&");
This is strictly a WinForms "thing" and has nothing to do with a C# or .NET string escaping specifically. It has been this way at least as far back as Visual Basic 4 - probably before then.
You may want to check out this post:
http://moiashvin-tech.blogspot.com/2008/05/escape-ampersand-character-in-c.html
Labels are handled differently in WinForms. You should be able to do as the post suggests and set the UseMnemonic property to false, see if that works.
The answer is in the first comment - '&' is a special character for WinForms (and the underlying Win32 API) which is/was used to indicate a shortcut character for menu/dialog items.
'&' in strings means nothing special to C#, but if you want to put it on a form/dialog label, then you need to escape the '&' by adding another one in front.
Personally, I would get the string how I really wanted it in my 'business logic' first, then escape the '&' characters as part of displaying the string on the form.
Since this is my first question here on stackoverflow I hope my question is correctly asked.
Basicly I have a normal .txt file which contains any text like:
car accident
people died
cat without owner
<!-- Text added at 6/29/2011 9:20:38 AM -->
Some addintional Text
other Text added
add Text
I have a write/append function which allows the user to append some text and set a little timestamp.
So my problem is: With another function, you can search and replace text in the textfile, but as you can guess if someone wants to replace the word "Text" it will be replaced in the xml-stylish comment(timestamp) as well.
My result until now is
content = Regex.Replace(content,"[^<+.*"+input+".*>+]*", replace);
//content = content of the .txt file, input = search term, replace = string to replace
But this fails miserably, as some regex pro's will see without executing it.
Now I hope that some regex pro could help me out here and provide me a search pattern which replaces the normal text but ignores the timestamp.
I'm not realy aware of the logic from regex until now, nevertheless I understand the single expressions so this would be a hook for me to understand Regex more properly.
Thanks in advice.
If I understand your question correctly, you want to replace every instance of "Text" except for the one(s) inside the comment.
The easist way is to use a negative lookbehind (fantastic description here) as below:
content = Regex.Replace(content, #"(?<!<!--.*?)" + input, replace);
What you're doing is attempting to replace a repetition of any length of a character that is NOT <+.*> or a character contained in input with the value in replace.
If you're going to be working a lot with Regex, I would HIGHLY recommend giving the website above a good read. It's hands down the best intro to Regex that I've found, the time spent now will save you lots of headaches later!
Edit
Updated to add flexibility thanks to #stema
I have a multiline textbox that I wish to convert to a string,
I found this
string textBoxValue = textBox1.Text.Replace(Environment.NewLine,"TOKEN");
But dont understand TOKEN what is TOKEN? whitespace or /n newline ?
If this is the incorrect answer then Please let me know of the correct way of doing this
Thanks
In the code snippet you gave, "TOKEN" is any value you wish to insert, such as an HTML <br /> tag, more Environment.NewLines for formatting, or just some random delimiter that will later allow you to split the text on it.
A very simple example:
string text = textBox1.Text.Replace(Environment.NewLine, "^"); // a random token
string[] lines = test.Split( '^' );
If you are handling input from a textbox available on the web, you also need to take into account XSS (http://en.wikipedia.org/wiki/Cross-site_scripting). Also, in a real scenario I would split on a more complex token and make sure to handle multiple carriage returns in the input value.
EDIT: now that I see your actual requirements, this code may do what you need:
// replace newlines with a single whitespace
string text = textBox1.Text.Replace(Environment.NewLine, " ");
EDIT #2:
further I need to enter this data into
SQLite and rewrite his whole
application, The company does not wish
to have information from the previos
application inputted to the new
database, there are hyperlinks etc
inbedded in the content , so if there
is a way I can make the text box only
accept RAW data this would be the
best.
Regular Expressions are the way to go for something like this, unless the data is structured enough to load into an XML or HTML DOM and process. You can build regular expressions in a variety of tools (do a Google search for a free online tester and you will find many). Once you have determined the expressions you need, you can use the Regex object in C# to match, replace, etc.
http://msdn.microsoft.com/en-us/library/ms228595(VS.80).aspx
http://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex.replace(v=VS.100).aspx
As it stands, "TOKEN" is just a meangingless string, unless it is elsewhere in your code? You can replace "TOKEN" with any text you like.
Edit:
Okay, so you say you're removing NewLine's from your client's text. So you would do it like this. Paste their text into a textBox called textBox2, then use the following:
textBox2.Text = textBox2.Text.Replace(Environment.NewLine, string.Empty);