how to read multi lines in text file in c#? [duplicate]

This question already has answers here: How to read an entire file to a string using C#? (16 answers) Closed 3 years开发者_开发问答 ago.

i like to read check the text has multi line or single line and then i am going to read that multi lines and convert into single line how can i do this?

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You really do not need to check as File.ReadAllLines() will always return a string array regardless of the number of lines. You can leverage that behavior and simply join the returned array with your separator of choice.

string singleLine = string.Join(" ", File.ReadAllLines("filepath"));

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string text = String.Empty;
if(textbox.Text.Contains(Environment.NewLine))
{
    //textbox contains a new line, replace new lines with spaces
    text = textbox.Text.Replace(Environment.NewLine, " ");
}
else
{
    //single line - simply assign to variable
    text = textbox.Text;
}

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try something like that (depends on how you treat "lines"):

System.IO.File.ReadAllText(path).Replace("\n\r", "");

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This will read all the lines from a text file and join them into one string with ; as a separator:

string[] lines = File.ReadAllLines("myfile.txt");
string myLine = String.Join(";", lines);