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How to Replace two slashes to one single slashe? C#

I have a problem with somwthing about replace char. I tryied a lot of links but get the same problem to replace (\\) to (\)
here is my code:
string mystringA = textBox.text
string mystringB = mystringA.Replace("\\", "\"");
The result of mystringB stay the same as mystringA.
I am saying because I put a debug mode to see the result
My textBox.txt = C:\Users\Braulio Jose\Desktop\impressora\myfoto.png
I have to replace the double quotes because I want to delete this photo in another place but when I follow the path, mystringA put another quote, and I this path don't exist
I am using visual studio 2013 and C# Language.
Some help. thank you

Due to the fact, that your question is about quotes, but your code is about slashes, it's hard to guess what your real problem is.
But here is some sample code for both replacements:
var replaceQuotes = "Some text with \"\"double quotes\"\"";
var replacedQuotes = replaceQuotes.Replace("\"\"", "\"");
Console.WriteLine("Before: " + replaceQuotes);
Console.WriteLine("After: " + replacedQuotes);
Console.WriteLine();
var replaceSlashes = "Some text with \\\\double slashes\\\\";
var replacedSlashes = replaceSlashes.Replace("\\\\", "\\");
Console.WriteLine("Before: " + replaceSlashes);
Console.WriteLine("After: " + replacedSlashes);
And here the output:
Before: Some text with ""double quotes""
After: Some text with "double quotes"
Before: Some text with \\double slashes\\
After: Some text with \double slashes\

String formatting for rich text box with constant and dynamic text

Currently I am attempting to create a dictionary which maps a selected item form a list view with a corresponding string output in a rich text box. I would like to bold specific text in the string, which will always be the same (constant) and also adding dynamic text to the string that would change.
Something like this:
ID: 8494903282
Where ID is the constant text I need bolded and the numbers would be a dynamic ID that changes. I will need to have multiple lines with different data in this format which will be changing:
ID: 8494903282
Name: Some Name
Date: 3/15/2018
Currently I have a rich text box to output to and I am trying to use some string formatting to do what I want but this is not working correctly. Essentially I need a string value I can store in a dictionary so when an item gets selected I can just set the rtf property of the text box to the value of that dictionary item.
Below I have my current format string I am attempting to set the rtf property to:
string s1 = string.Format(#"{{\rtf1\ansi \b Commit ID: \b0 {0}\line}}", entry.ID);
string s2 = string.Format(#"{{\b Author: \b0 {0}\line}}", entry.Author);
string s3 = string.Format(#"{{\b Date: \b0 {0}\line}}", entry.Date.ToString("d"));
string s4 = Environment.NewLine + Environment.NewLine + entry.Message;
contents = (s1 + s2 + s3 + s4);
Then setting the rtf property of my rich text box:
LogContentsTB.Rtf = Logs[LogNamesLV.SelectedItems[0].Name];
Where logs is a dictionary of the form < string, string > that holds the format string for the specific item.
However, I get the following output rather than my expected output:
This is the correct form of output for the first item but nothing else appears. If there are any other ways to do this I am open to suggestion.

After doing some light reading on the rtf syntax I noticed that I was trying to close off each string with curly braces. Curly braces are used for RTF groups. For some reason the rich text box in windows forms did not play well with that.
Another thing to notice is that the string.format method was probably the main culprit for cause of issues with this type of formatting. In my answer I do not use it but rather just add the string directly into the rtf formatted string i.e. < format >< variable string >< ending format >
If you look at NetMage's response, you will notice he only puts an opening brace on the very first string, s1. This is to group the whole string. But we need to add a closing brace on the final string, s4, to finish the grouping. Below is the final code and screenshot that worked for my application.
string s1 = #"{\rtf1\ansi\b ID: \b0 " + entry.ID + #" \line\line";
string s2 = #"\b Author: \b0 " + entry.Author + #" \line\line";
string s3 = #"\b Date: \b0 " + entry.Date.ToString("d") + #" \line\line ";
string s4 = entry.Message + #"}";
contents = s1 + s2 + s3 + s4;
Thanks for pointing me in the right direction!

I think your RTF formatting is wrong. You could try:
string s1 = string.Format(#"{{\rtf1\ansi\r\b Commit ID:\b0 {0}\line\r", entry.ID);
string s2 = string.Format(#"\b Author: \b0 {0}\line\r", entry.Author);
string s3 = string.Format(#"\b Date: \b0 {0}\line\r", entry.Date.ToString("d"));
string s4 = Environment.NewLine + Environment.NewLine + entry.Message + "}}";
contents = (s1 + s2 + s3 + s4);

programmatic textblock entry with linebreaks

How do I programmatically add text with line breaks to a textblock?
If I insert text like this:
helpBlock.Text = "Here is some text. <LineBreak/> Here is <LineBreak/> some <LineBreak/> more.";
Then the linebreaks get interpreted as part of the string literal. I want it to be more like what would happen if I had it in the XAML.
I can't seem to do it the WPF way either:
helpBlock.Inlines.Add("Here is some content.");
Since the Add() method wants to accept objects of type "inline".
I can't create an Inline object and pass it as a parameter because it is "inaccessible due to its protection level:
helpBlock.Inlines.Add(new Windows.UI.Xaml.Documents.Inline("More text"));
I don't see a way to programmatically add runs.
I can find a ton of WPF examples of this, but nothing for WinRT.
I've also turned up a lot of XAML examples, but nothing from C#.

You could just pass in newline \n instead of <LineBreak/>
helpBlock.Text = "Here is some text. \n Here is \n some \n more.";
Or in Xaml you would use the Hex value of newline
<TextBlock Text="Here is some text.
Here is
some
more."/>
Both results:

Use Enviroment.NewLine
testText.Text = "Testing 123" + Environment.NewLine + "Testing ABC";
StringBuilder builder = new StringBuilder();
builder.Append(Environment.NewLine);
builder.Append("Test Text");
builder.Append(Environment.NewLine);
builder.Append("Test 2 Text");
testText.Text += builder.ToString();

You could convert \n to <LineBreak/> programmatically.
string text = "This is a line.\nThis is another line.";
IList<string> lines = text.Split(new string[] { #"\n" }, StringSplitOptions.None);
TextBlock tb = new TextBlock();
foreach (string line in lines)
{
tb.Inlines.Add(line);
tb.Inlines.Add(new LineBreak());
}

Solution:
I would use "\n" instead of linebreaks. Best way would be use it on this way:
Resources.resx file:
myTextline: "Here is some text. \n Here is \n some \n more."
In yours Class:
helpBlock.Text = Resources.myTextline;
This will looks like:
Other solution would be to build your string here with Environment.NewLine.
StringBuilder builder = new StringBuilder();
builder.Append(Environment.NewLine);
builder.Append(Resources.line1);
builder.Append(Environment.NewLine);
builder.Append(Resources.line2);
helpBlock.Text += builder.ToString();
Or use here "\n"
StringBuilder builder = new StringBuilder();
builder.Append("\n");
builder.Append(Resources.line1);
builder.Append("\n");
builder.Append(Resources.line2);
helpBlock.Text += builder.ToString();

I have one component XAML
<TextBlock x:Name="textLog" TextWrapping="Wrap" Background="#FFDEDEDE"/>
Then I pass the string + Environment.NewLine;
Example:
textLog.Inlines.Add("Inicio do processamento " + DateTime.Now.ToString("dd/MM/yyyy HH:mm:ss") + Environment.NewLine);
textLog.Inlines.Add("-----------------------------------" + Environment.NewLine);
The result is
Inicio do processamento 19/08/2019 20:31:13
-----------------------------------

Reading from a file in C# without the newline character

i want to read from a text file in C#. But I want all the lines in the file to be concatenated into one line.
for example if i have in the file as
ABCD
EFGH
I need to read ABCDEFGH as one line.
I can do this by reading one line at a time from the file and concatenating that line to a string in a loop. But are there any faster method to do this?

string.Join(" ", File.ReadAllLines("path"));
Replace " " with "" or any other alternative "line-separator"
Example file:
some line
some other line
and yet another one
With " " as separator:
some line some other line and yet another one
With "" as separator:
some linesome other lineand yet another one

Use this:
using (System.IO.StreamReader myFile = new System.IO.StreamReader("test.txt")) {
string myString = myFile.ReadToEnd().Replace(Environment.NewLine, "");
}

What is a one line for you?
If you want to put the entire content of a file into a string, you could do
string fileContent = File.ReadAllText(#"c:\sometext.txt");
If you want your string without newline characters you could do
fileContent = fileContent.Replace(Environment.NewLine, " ");

string file = File.ReadAllText("text.txt").Replace("\r\n", " ");

How to insert newline in string literal?

In .NET I can provide both \r or \n string literals, but there is a way to insert
something like "new line" special character like Environment.NewLine static property?

Well, simple options are:
string.Format:
string x = string.Format("first line{0}second line", Environment.NewLine);
String concatenation:
string x = "first line" + Environment.NewLine + "second line";
String interpolation (in C#6 and above):
string x = $"first line{Environment.NewLine}second line";
You could also use \n everywhere, and replace:
string x = "first line\nsecond line\nthird line".Replace("\n",
Environment.NewLine);
Note that you can't make this a string constant, because the value of Environment.NewLine will only be available at execution time.

If you want a const string that contains Environment.NewLine in it you can do something like this:
const string stringWithNewLine =
#"first line
second line
third line";
EDIT
Since this is in a const string it is done in compile time therefore it is the compiler's interpretation of a newline. I can't seem to find a reference explaining this behavior but, I can prove it works as intended. I compiled this code on both Windows and Ubuntu (with Mono) then disassembled and these are the results:
As you can see, in Windows newlines are interpreted as \r\n and on Ubuntu as \n

var sb = new StringBuilder();
sb.Append(first);
sb.AppendLine(); // which is equal to Append(Environment.NewLine);
sb.Append(second);
return sb.ToString();

One more way of convenient placement of Environment.NewLine in format string.
The idea is to create string extension method that formats string as usual but also replaces {nl} in text with Environment.NewLine
Usage
" X={0} {nl} Y={1}{nl} X+Y={2}".FormatIt(1, 2, 1+2);
gives:
X=1
Y=2
X+Y=3
Code
///<summary>
/// Use "string".FormatIt(...) instead of string.Format("string, ...)
/// Use {nl} in text to insert Environment.NewLine
///</summary>
///<exception cref="ArgumentNullException">If format is null</exception>
[StringFormatMethod("format")]
public static string FormatIt(this string format, params object[] args)
{
if (format == null) throw new ArgumentNullException("format");
return string.Format(format.Replace("{nl}", Environment.NewLine), args);
}
Note
If you want ReSharper to highlight your parameters, add attribute to the method above
[StringFormatMethod("format")]
This implementation is obviously less efficient than just String.Format
Maybe one, who interested in this question would be interested in the next question too:
Named string formatting in C#

string myText =
#"<div class=""firstLine""></div>
<div class=""secondLine""></div>
<div class=""thirdLine""></div>";
that's not it:
string myText =
#"<div class=\"firstLine\"></div>
<div class=\"secondLine\"></div>
<div class=\"thirdLine\"></div>";

If you really want the New Line string as a constant, then you can do this:
public readonly string myVar = Environment.NewLine;
The user of the readonly keyword in C# means that this variable can only be assigned to once. You can find the documentation on it here. It allows the declaration of a constant variable whose value isn't known until execution time.

static class MyClass
{
public const string NewLine="\n";
}
string x = "first line" + MyClass.NewLine + "second line"

newer .net versions allow you to use $ in front of the literal which allows you to use variables inside like follows:
var x = $"Line 1{Environment.NewLine}Line 2{Environment.NewLine}Line 3";

If you are working with Web application you can try this.
StringBuilder sb = new StringBuilder();
sb.AppendLine("Some text with line one");
sb.AppendLine("Some mpre text with line two");
MyLabel.Text = sb.ToString().Replace(Environment.NewLine, "<br />")

If I understand the question: Couple "\r\n" to get that new line below in a textbox. My example worked -
string s1 = comboBox1.Text; // s1 is the variable assigned to box 1, etc.
string s2 = comboBox2.Text;
string both = s1 + "\r\n" + s2;
textBox1.Text = both;
A typical answer could be s1
s2 in the text box using defined type style.

I like more the "pythonic way"
List<string> lines = new List<string> {
"line1",
"line2",
String.Format("{0} - {1} | {2}",
someVar,
othervar,
thirdVar
)
};
if(foo)
lines.Add("line3");
return String.Join(Environment.NewLine, lines);

Here, Environment.NewLine doesn't worked.
I put a "<br/>" in a string and worked.
Ex:
ltrYourLiteral.Text = "First line.<br/>Second Line.";