In C#, how can I create a TextReader object from a string (without writing to disk)

问题

I'm using A Fast CSV Reader to parse some pasted text into a webpage. The Fast CSV reader requires a TextReader object, and all I have is a string. What's the best way to convert a string into a TextReader object on the fly?

Thanks!

Update- Sample code- In the original sample, a new StreamReader is looking for a file called "data.csv". I'm hoping to supply it via TextBox_StartData.Text.

Using this code below doesn't compile.

        TextReader sr = new StringReader(TextBox_StartData.Text);
        using (CsvReader csv = new CsvReader(new StreamReader(sr), true))
        {
            DetailsView1.DataSource = csv;
            DetailsView1.DataBind();
        }

The new StreamReader(sr) tells me it has some invalid arguments. Any ideas?

As an alternate approach, I've tried this:

        TextReader sr = new StreamReader(TextBox_StartData.Text);
        using (CsvReader csv = new CsvReader(sr, true))
        {
            DetailsView1.DataSource = csv;
            DetailsView1.DataBind();
        }

but I get an Illegal characters in path Error. Here's a sample of the string from TextBox_StartData.Text:

Fname\tLname\tEmail\nClaude\tCuriel\tClaude.Curiel@email.com\nAntoinette\tCalixte\tAntoinette.Calixte@email.com\nCathey\tPeden\tCathey.Peden@email.com\n

Any ideas if this the right approach? Thanks again for your help!

回答1:

Use System.IO.StringReader :

using(TextReader sr = new StringReader(yourstring))
{
    DoSomethingWithATextReader(sr);
}

回答2:

Use the StringReader class, which inherits TextReader.

回答3:

You want a StringReader

var val = "test string";
var textReader = new StringReader(val);

回答4:

StringReader is a TextReader (StreamReader is too, but for reading from streams). So taking your first example and just using it to construct the CsvReader rather than trying to construct a StreamReader from it first gives:

TextReader sr = new StringReader(TextBox_StartData.Text);
using(CsvReader csv = new CsvReader(sr, true))
{
  DetailsView1.DataSource = csv;
  DetailsView1.DataBind();
}

回答5:

Simply use the StringReader class. It inherits from TextReader.

回答6:

If you look at the documentation for TextReader, you will see two inheriting classes. And one of them is StringReader, which seems to do exactly what you want.

来源：https://stackoverflow.com/questions/7837826/in-c-how-can-i-create-a-textreader-object-from-a-string-without-writing-to-di

标签

csv

csvhelper

textreader